                           Committer's Guide

  The FreeBSD Documentation Project

   $FreeBSD:
   release/8.4.0/en_US.ISO8859-1/articles/committers-guide/article.xml
   41199 2013-03-13 17:52:57Z bdrewery $

   Copyright (c) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   2007, 2008, 2009, 2010, 2011, 2012, 2013 The FreeBSD Documentation
   Project

   $FreeBSD:
   release/8.4.0/en_US.ISO8859-1/articles/committers-guide/article.xml
   41199 2013-03-13 17:52:57Z bdrewery $

   FreeBSD is a registered trademark of the FreeBSD Foundation.

   Coverity is a registered trademark; Coverity Extend, Coverity
   Prevent and Coverity Prevent SQS are trademarks of Coverity, Inc.

   IBM, AIX, EtherJet, Netfinity, OS/2, PowerPC, PS/2, S/390, and
   ThinkPad are trademarks of International Business Machines
   Corporation in the United States, other countries, or both.

   Intel, Celeron, EtherExpress, i386, i486, Itanium, Pentium, and
   Xeon are trademarks or registered trademarks of Intel Corporation
   or its subsidiaries in the United States and other countries.

   SPARC, SPARC64, SPARCengine, and UltraSPARC are trademarks of
   SPARC International, Inc in the United States and other countries.
   SPARC International, Inc owns all of the SPARC trademarks and
   under licensing agreements allows the proper use of these
   trademarks by its members.

   Many of the designations used by manufacturers and sellers to
   distinguish their products are claimed as trademarks. Where those
   designations appear in this document, and the FreeBSD Project was
   aware of the trademark claim, the designations have been followed
   by the "(TM)" or the "(R)" symbol.

   This document provides information for the FreeBSD committer
   community. All new committers should read this document before
   they start, and existing committers are strongly encouraged to
   review it from time to time.

   Almost all FreeBSD developers have commit rights to one or more
   repositories. However, a few developers do not, and some of the
   information here applies to them as well. (For instance, some
   people only have rights to work with the Problem Report database).
   Please see Section 14 for more information.

   This document may also be of interest to members of the FreeBSD
   community who want to learn more about how the project works.

     --------------------------------------------------------------

1 Administrative Details

   Login Methods ssh(1), protocol 2 only                              
   Main Shell    freefall.FreeBSD.org                                 
   Host          
   src/                                                               
   Subversion    svn+ssh://svn.FreeBSD.org/base (see also Section 3).
   Root          
   doc/                                                               
   Subversion    svn+ssh://svn.FreeBSD.org/doc (see also Section 3).
   Root          
   ports/        svn+ssh://svn.FreeBSD.org/ports (see also Section    
   Subversion    3).                                                  
   Root          
                 developers (technically called all-developers),      
                 doc-developers, doc-committers, ports-developers,    
                 ports-committers, src-developers, src-committers.    
   Internal      (Each project repository has its own -developers and 
   Mailing Lists -committers mailing lists. Archives for these lists  
                 may be found in files                                
                 /home/mail/repository-name-developers-archive and    
                 /home/mail/repository-name-committers-archive on the 
                 FreeBSD.org cluster.)                                
   Core Team     /home/core/public/monthly-reports on the FreeBSD.org 
   monthly       cluster.                                             
   reports       
   Ports                                                              
   Management    /home/portmgr/public/monthly-reports on the          
   Team monthly  FreeBSD.org cluster.
   reports       
   Noteworthy    stable/7 (7.X-STABLE), stable/8 (8.X-STABLE),        
   src/ SVN      stable/9 (9.X-STABLE), head (-CURRENT)               
   Branches      

   It is required that you use ssh(1) to connect to the project
   hosts. If you do not know anything about ssh(1), please see
   Section 9.

   Useful links:

     * FreeBSD Project Internal Pages

     * FreeBSD Project Hosts

     * FreeBSD Project Administrative Groups

     --------------------------------------------------------------

2 Commit Bit Types

   The FreeBSD repository has a number of components which, when
   combined, support the basic operating system source,
   documentation, third party application ports infrastructure, and
   various maintained utilities. When FreeBSD commit bits are
   allocated, the areas of the tree where the bit may be used are
   specified. Generally, the areas associated with a bit reflect who
   authorized the allocation of the commit bit. Additional areas of
   authority may be added at a later date: when this occurs, the
   committer should follow normal commit bit allocation procedures
   for that area of the tree, seeking approval from the appropriate
   entity and possibly getting a mentor for that area for some period
   of time.

   Committer Type Responsible Tree Components                         
   src            core@       src/, doc/ subject to appropriate       
                              review                                  
   doc            doceng@     doc/, src/ documentation                
   ports          portmgr@    ports/                                  

   Commit bits allocated prior to the development of the notion of
   areas of authority may be appropriate for use in many parts of the
   tree. However, common sense dictates that a committer who has not
   previously worked in an area of the tree seek review prior to
   committing, seek approval from the appropriate responsible party,
   and/or work with a mentor. Since the rules regarding code
   maintenance differ by area of the tree, this is as much for the
   benefit of the committer working in an area of less familiarity as
   it is for others working on the tree.

   Committers are encouraged to seek review for their work as part of
   the normal development process, regardless of the area of the tree
   where the work is occurring.

     --------------------------------------------------------------

  2.1 Policy for doc/ committer activity in src/

     * doc committers may commit documentation changes to src files,
       such as man pages, READMEs, fortune databases, calendar files,
       and comment fixes without approval from a src committer,
       subject to the normal care and tending of commits.

     * doc committers may commit minor src changes and fixes, such as
       build fixes, small features, etc, with an "Approved by" from a
       src committer.

     * doc committers may seek an upgrade to a src commit bit by
       acquiring a mentor, who will propose the doc committer to
       core. When approved, they will be added to 'access' and the
       normal mentoring period will ensue, which will involve a
       continuing of "Approved by" for some period.

     * "Approved by" is only acceptable from non-mentored src
       committers -- mentored committers can provide a "Reviewed by"
       but not an "Approved by".

     --------------------------------------------------------------

3 Subversion Primer

   It is assumed that you are already familiar with the basic
   operation of the version control systems in use. Traditionally
   this was CVS. Subversion is used for the src tree as of May 2008,
   the doc/www tree as of May 2012 and the ports tree as of July
   2012.

   There is a list of things missing in Subversion when compared to
   CVS . The notes at http://people.freebsd.org/~peter/svn_notes.txt
   might also be useful.

     --------------------------------------------------------------

  3.1 Introduction

   The FreeBSD source repository switched from CVS to Subversion on
   May 31st, 2008. The first real SVN commit is r179447.

   The FreeBSD doc/www repository switched from CVS to Subversion on
   May 19th, 2012. The first real SVN commit is r38821.

     Note: Part of the doc/www CVS to SVN conversion included an
     infrastructural change to the build process. The most notable
     change is the location of the FreeBSD website www tree, which
     has been moved from www/lang/ to head/lang/htdocs/.

   The FreeBSD ports repository switched from CVS to Subversion on
   July 14th, 2012. The first real SVN commit is r300894.

   There are mechanisms in place to automatically merge changes back
   from the Subversion src repository to the CVS repository for some
   FreeBSD branches (releng/6 through releng/9), however this is
   purely to support pre-existing end-user installs and should not be
   relied upon, recommended or advertised. Future branches will not
   be exported to CVS at all. The ports repository was exported to
   CVS for a period of time to aid end user migration, but as of 28th
   February 2013 is no longer exported.

   Subversion is not that different from CVS when it comes to daily
   use, but there are differences. Subversion has a number of
   features that should make developers' lives easier. The most
   important advantage to Subversion (and the reason why FreeBSD
   switched) is that it handles branches and merging much better than
   CVS does. Some of the principal differences are:

     * Commits are atomic.

     * Revision numbers apply across the repository-all files that
       were modified in the same commit have the same revision
       number.

     * Branching and tagging are namespace operations.

     * Directories are versioned.

     * Files and directories can have arbitrary, versioned metadata
       attached to them.

     * Files and directories can be copied, with full history
       tracking.

     * No more contortions due to CVS weakness such as applying
       patch(1) files at compile time in order to avoid touching
       vendor branch code.

     * No more repo-copies.

   Subversion can be installed from the FreeBSD Ports Collection, by
   issuing the following commands:

 # cd /usr/ports/devel/subversion
 # make clean install

     --------------------------------------------------------------

  3.2 Getting Started

   There are a few ways to obtain a working copy of the tree from
   Subversion. This section will explain them.

     --------------------------------------------------------------

    3.2.1 Direct Checkout

   The first is to check out directly from the main repository. For
   the src tree, use:

 % svn checkout svn+ssh://svn.freebsd.org/base/head /usr/src

   For the doc tree, use:

 % svn checkout svn+ssh://svn.freebsd.org/doc/head /usr/doc

   For the ports tree, use:

 % svn checkout svn+ssh://svn.freebsd.org/ports/head /usr/ports

     Note: Though the remaining examples in this document are written
     with the workflow of working with the src tree in mind, the
     underlying concepts are the same for working with the doc and
     the ports tree. Ports related Subversion operations are listed
     in Section 13.

   The above command will check out a CURRENT source tree as
   /usr/src/, which can be any target directory on the local
   filesystem. Omitting the final argument of that command causes the
   working copy, in this case, to be named "head", but that can be
   renamed safely.

   svn+ssh means the SVN protocol tunnelled over SSH. The name of the
   server is svn.freebsd.org, base is the path to the repository, and
   head is the subdirectory within the repository.

   If your FreeBSD login name is different from your login name on
   your local machine, you must either include it in the URL (for
   example svn+ssh://jarjar@svn.freebsd.org/base/head), or add an
   entry to your ~/.ssh/config in the form:

 Host svn.freebsd.org
         User jarjar

   This is the simplest method, but it's hard to tell just yet how
   much load it will place on the repository. Subversion is much
   faster than CVS, however.

     Note: The svn diff does not require access to the server as SVN
     stores a reference copy of every file in the working copy. This,
     however, means that Subversion working copies are very large in
     size.

     --------------------------------------------------------------

    3.2.2 Checkout from a Mirror

   Check out a working copy from a mirror by substituting the
   mirror's URL for svn+ssh://svn.freebsd.org/base. This can be an
   official mirror or a mirror maintained by using svnsync.

   There is a serious disadvantage to this method: every time
   something is to be committed, a svn switch --relocate to the
   master repository has to be done, remembering to svn switch back
   to the mirror after the commit. Also, since svn switch only works
   between repositories that have the same UUID, some hacking of the
   local repository's UUID has to occur before it is possible to
   start using it.

   Unlike with CVS, the hassle of a local svnsync mirror probably is
   not worth it unless the network connectivity situation or other
   factors demand it. If it is needed, see the end of this chapter
   for information on how to set one up.

     --------------------------------------------------------------

    3.2.3 RELENG_* Branches and General Layout

   In svn+ssh://svn.freebsd.org/base, base refers to the source tree.
   Similarly, ports refers to the ports tree, and so on. These are
   separate repositories with their own change number sequences,
   access controls and commit mail.

   For the base repository, HEAD refers to the -CURRENT tree. For
   example, head/bin/ls is what would go into /usr/src/bin/ls in a
   release. Some key locations are:

     * /head/ which corresponds to HEAD, also known as -CURRENT.

     * /stable/n which corresponds to RELENG_n.

     * /releng/n.n which corresponds to RELENG_n_n.

     * /release/n.n.n which corresponds to RELENG_n_n_n_RELEASE.

     * /vendor* is the vendor branch import work area. This directory
       itself does not contain branches, however its subdirectories
       do. This contrasts with the stable, releng and release
       directories.

     * /projects and /user feature a branch work area, like in
       Perforce. As above, the /user directory does not contain
       branches itself.

     --------------------------------------------------------------

    3.2.4 FreeBSD Documentation Project Branches and Layout

   In svn+ssh://svn.freebsd.org/doc, doc refers repository root of
   the source tree.

   In general, most FreeBSD Documentation Project work will be done
   within the head/ branch of the source tree.

   FreeBSD documentation is written and/or translated to various
   languages, each of which within a separate directory within the
   head/ branch.

   Each translation set contains several subdirectories for the
   various parts of the FreeBSD Documentation Project. A few
   noteworthy directories are:

     * /articles/ contains the source code for articles written by
       various FreeBSD contributors.

     * /books/ contains the source code for the different books, such
       as the FreeBSD Handbook.

     * /htdocs/ contains the source code for the FreeBSD website.

     --------------------------------------------------------------

    3.2.5 FreeBSD Ports Tree Branches and Layout

   In svn+ssh://svn.freebsd.org/ports, ports refers repository root
   of the ports tree.

   In general, most FreeBSD port work will be done within the head/
   branch of the ports tree which is the actual ports tree used to
   install software. Some other key locations are:

     * /branches/RELENG_n_n_n which corresponds to RELENG_n_n_n is
       used to merge back security updates in preparation for a
       release.

     * /tags/RELEASE_n_n_n which corresponds to RELEASE_n_n_n
       represents a release tag of the ports tree.

     * /tags/RELEASE_n_EOL represents the end of life tag of a
       specific FreeBSD branch.

     --------------------------------------------------------------

  3.3 Daily Use

   This section will explain how to perform common day-to-day
   operations with Subversion. There should be no difference between
   SVN and SVK in daily use, except for the revision renumbering
   mentioned earlier.

     --------------------------------------------------------------

    3.3.1 Help

   Both SVN and SVK have built in help documentation. It can be
   accessed by typing the following command:

 % svn help

     --------------------------------------------------------------

    3.3.2 Checkout

   As seen earlier, to check out the FreeBSD head branch:

 % svn checkout svn+ssh://svn.freebsd.org/base/head /usr/src

   At some point, more than just HEAD will probably be useful, for
   instance when merging changes to stable/7. Therefore, it may be
   useful to have a partial checkout of the complete tree (a full
   checkout would be very painful).

   To do this, first check out the root of the repository:

 % svn checkout --depth=immediates svn+ssh://svn.freebsd.org/base

   This will give base with all the files it contains (at the time of
   writing, just ROADMAP.txt) and empty subdirectories for head,
   stable, vendor and so on.

   Expanding the working copy is possible. Just change the depth of
   the various subdirectories:

 % svn up --set-depth=infinity base/head
 % svn up --set-depth=immediates base/release base/releng base/stable

   The above command will pull down a full copy of head, plus empty
   copies of every release tag, every releng branch, and every stable
   branch.

   If at a later date merging to 7-STABLE is required, expand the
   working copy:

 % svn up --set-depth=infinity base/stable/7

   Subtrees do not have to be expanded completely. For instance,
   expanding only stable/7/sys and then later expand the rest of
   stable/7:

 % svn up --set-depth=infinity base/stable/7/sys
 % svn up --set-depth=infinity base/stable/7

   Updating the tree with svn update will only update what was
   previously asked for (in this case, head and stable/7; it will not
   pull down the whole tree.

     Note: Decreasing the depth of a working copy is not possible.

     --------------------------------------------------------------

    3.3.3 Anonymous Checkout

   It is possible to anonymously check out the FreeBSD repository
   with Subversion. This will give access to a read-only tree that
   can be updated, but not committed to. To do this, use the
   following command:

 % svn co https://svn0.us-west.FreeBSD.org/base/head /usr/src

   Select the closest mirror and verify the mirror server certificate
   from the list of Subversion mirror sites.

     --------------------------------------------------------------

    3.3.4 Updating the Tree

   To update a working copy to either the latest revision, or a
   specific revision:

 % svn update
 % svn update -r12345

     --------------------------------------------------------------

    3.3.5 Status

   To view the local changes that have been made to the working copy:

 % svn status

   To show local changes and files that are out-of-date do:

 % svn status --show-updates

     --------------------------------------------------------------

    3.3.6 Editing and Committing

   Unlike Perforce, SVN and SVK do not need to be told in advance
   about file editing.

   svn commit works like the equivalent CVS command. To commit all
   changes in the current directory and all subdirectories:

 % svn commit

   To commit all changes in, for example, lib/libfetch/ and
   usr/bin/fetch/ in a single operation:

 % svn commit lib/libfetch usr/bin/fetch

   There is also a commit wrapper for the ports tree to handle the
   properties and sanity checking your changes:

 % /usr/ports/Tools/scripts/psvn commit
          

     --------------------------------------------------------------

    3.3.7 Adding and Removing Files

     Note: Before adding files, get a copy of auto-props.txt (there
     is also a   ports tree specific version) and add it to
     ~/.subversion/config according to the instructions in the file.
     If you added something before you've read this, you may use svn
     rm --keep-local for just added files, fix your config file and
     re-add them again. The initial config file is created when you
     first run a svn command, even something as simple as svn help.

   Files are added to a SVN repository with svn add. To add a file
   named foo, edit it, then:

 % svn add foo

   Files can be removed with svn remove:

 % svn remove foo

   Subversion does not require rming the file before svn rming it,
   and indeed complains if that happens.

   It is possible to add directories with svn add:

 % mkdir bar
 % svn add bar

   Although svn mkdir makes this easier by combining the creation of
   the directory and the adding of it:

 % svn mkdir bar

   The directory is not immediately created in the repository when
   you use svn mkdir. Subversion allows directories to be removed
   using svn rm, however there is no svn rmdir:

 % svn rm bar

     --------------------------------------------------------------

    3.3.8 Copying and Moving Files

   The following (obviously) creates a copy of foo.c, named bar.c:

 % svn copy foo.c bar.c

   To move and rename a file:

 % svn move foo.c bar.c

   The above command is the exact equivalent of:

 % svn copy foo.c bar.c
 % svn remove foo.c

     --------------------------------------------------------------

    3.3.9 Log and Annotate

   svn log will show all the revisions that affect a directory and
   files within that directory in reverse chronological order, if run
   on a directory. This contrasts with cvs log in that CVS shows the
   complete log for each file in the directory, including duplicate
   entries for revisions that affect multiple files.

   svn annotate, or equally svn praise or svn blame, is equivalent to
   cvs annotate in everything but output format.

     --------------------------------------------------------------

    3.3.10 Diffs

   svn diff displays changes to the working copy of the repository.
   Diffs generated by SVN are unified and include new files by
   default in the diff output.

   svn diff can show the changes between two revisions of the same
   file:

 % svn diff -r179453:179454 ROADMAP.txt

   It can also show all changes for a specific changeset. The
   following will show what changes were made to the current
   directory and all subdirectories in changeset 179454:

 % svn diff -c179454 .

     --------------------------------------------------------------

    3.3.11 Reverting

   Local changes (including additions and deletions) can be reverted
   using svn revert. It does not update out-of-date files-it just
   replaces them with pristine copies of the original version.

     --------------------------------------------------------------

    3.3.12 Conflicts

   If a svn update resulted in a merge conflict, Subversion will
   remember which files have conflicts and refuse to commit any
   changes to those files until explicitly told that the conflicts
   have been resolved. The simple, not yet deprecated procedure is
   the following:

 % svn resolved foo

   However, the preferred procedure is:

 % svn resolve --accept=working foo

   The two examples are equivalent. Possible values for --accept are:

     * working: use the version in your working directory (which one
       presumes has been edited to resolve the conflicts).

     * base: use a pristine copy of the version you had before svn
       update, discarding your own changes, the conflicting changes,
       and possibly other intervening changes as well.

     * mine-full: use what you had before svn update, including your
       own changes, but discarding the conflicting changes, and
       possibly other intervening changes as well.

     * theirs-full: use the version that was retrieved when you did
       svn update, discarding your own changes.

     --------------------------------------------------------------

  3.4 Advanced Use

    3.4.1 Sparse Checkouts

   The equivalent to cvs checkout -l, which checks out a directory
   without its subdirectories, is svn checkout -N. Unlike CVS, SVN
   remembers the -N so that a svn update does not end up pulling down
   the subdirectories. In Subversion 1.5 and newer, -N has been
   deprecated in favour of the --depth option which allows for
   precise control. Therefore:

 % svn checkout -N svn+ssh://svn.freebsd.org/base ~/freebsd

   is equivalent to:

 % svn checkout --depth=empty svn+ssh://svn.freebsd.org/base ~/freebsd

   Valid arguments to --depth are:

     * empty: the directory itself without any of its contents.

     * files: the directory and any files it contains.

     * immediates: the directory and any files and directories it
       contains, but none of the subdirectories' contents.

     * infinity: anything.

   The --depth option applies to many other commands, including svn
   commit, svn revert, and svn diff.

   Since --depth is sticky, there is a --set-depth option for svn
   update that will change the selected depth. Thus, given the
   working copy produced by the previous example:

 % cd ~/freebsd
 % svn update --set-depth=immediates .

   The above command will populate the working copy in ~/freebsd with
   ROADMAP.txt and empty subdirectories, and nothing will happen when
   svn update is executed on the subdirectories. However, the
   following command will set the depth for head (in this case) to
   infinity, and fully populate it:

 % svn update --set-depth=infinity head

     --------------------------------------------------------------

    3.4.2 Direct Operation

   Certain operations can be performed directly on the repository,
   without touching the working copy. Specifically, this applies to
   any operation that does not require editing a file, including:

     * log, diff.

     * mkdir.

     * remove, copy, rename.

     * propset, propedit, propdel.

     * merge.

   Branching is very fast. The following command would be used to
   branch RELENG_8:

 % svn copy svn+ssh://svn.freebsd.org/base/head svn+ssh://svn.freebsd.org/base/stable/8

   This is equivalent to the following set of commands which take
   minutes and hours as opposed to seconds, depending on your network
   connection:

 % svn checkout --depth=immediates svn+ssh://svn.freebsd.org/base
 % cd base
 % svn update --depth=infinity head
 % svn copy head stable/8
 % svn commit stable/8

     --------------------------------------------------------------

    3.4.3 Merging with SVN

   This section deals with merging code from one branch to another
   (typically, from head to a stable branch).

     Note: In all examples below, $FSVN refers to the location of the
     FreeBSD Subversion repository, svn+ssh://svn.freebsd.org/base/.

     --------------------------------------------------------------

      3.4.3.1 About Merge Tracking

   From the user's perspective, merge tracking information (or
   mergeinfo) is stored in a property called svn:mergeinfo, which is
   a comma-separated list of revisions and ranges of revisions that
   have been merged. When set on a file, it applies only to that
   file. When set on a directory, it applies to that directory and
   its descendants (files and directories) except for those that have
   their own svn:mergeinfo.

   It is not inherited. For instance, stable/6/contrib/openpam/ does
   not implicitly inherit mergeinfo from stable/6/, or
   stable/6/contrib/. Doing so would make partial checkouts very hard
   to manage. Instead, mergeinfo is explicitly propagated down the
   tree. For merging something into branch/foo/bar/, the following
   rules apply:

    1. If branch/foo/bar/ doesn't already have a mergeinfo record,
       but a direct ancestor (for instance, branch/foo/) does, then
       that record will be propagated down to branch/foo/bar/ before
       information about the current merge is recorded.

    2. Information about the current merge will not be propagated
       back up that ancestor.

    3. If a direct descendant of branch/foo/bar/ (for instance,
       branch/foo/bar/baz/) already has a mergeinfo record,
       information about the current merge will be propagated down to
       it.

   If you consider the case where a revision changes several separate
   parts of the tree (for example, branch/foo/bar/ and
   branch/foo/quux/), but you only want to merge some of it (for
   example, branch/foo/bar/), you will see that these rules make
   sense. If mergeinfo was propagated up, it would seem like that
   revision had also been merged to branch/foo/quux/, when in fact it
   had not been.

     --------------------------------------------------------------

      3.4.3.2 Selecting the Source and Target

   Because of mergeinfo propagation, it is important to choose the
   source and target for the merge carefully to minimise property
   changes on unrelated directories.

   The rules for selecting the merge target (the directory that you
   will merge the changes to) can be summarized as follows:

    1. Never merge directly to a file.

    2. Never, ever merge directly to a file.

    3. Never, ever, ever merge directly to a file.

    4. Changes to kernel code should be merged to sys/. For instance,
       a change to the ichwd(4) driver should be merged to sys/, not
       sys/dev/ichwd/. Likewise, a change to the TCP/IP stack should
       be merged to sys/, not sys/netinet/.

    5. Changes to code under etc/ should be merged at etc/, not below
       it.

    6. Changes to vendor code (code in contrib/, crypto/ and so on)
       should be merged to the directory where vendor imports happen.
       For instance, a change to crypto/openssl/util/ should be
       merged to crypto/openssl/. This is rarely an issue, however,
       since changes to vendor code are usually merged wholesale.

    7. Changes to userland programs should as a general rule be
       merged to the directory that contains the Makefile for that
       program. For instance, a change to usr.bin/xlint/arch/i386/
       should be merged to usr.bin/xlint/.

    8. Changes to userland libraries should as a general rule be
       merged to the directory that contains the Makefile for that
       library. For instance, a change to lib/libc/gen/ should be
       merged to lib/libc/.

    9. There may be cases where it makes sense to deviate from the
       rules for userland programs and libraries. For instance,
       everything under lib/libpam/ is merged to lib/libpam/, even
       though the library itself and all of the modules each have
       their own Makefile.

   10. Changes to manual pages should be merged to share/man/manN/,
       for the appropriate value of N.

   11. Other changes to share/ should be merged to the appropriate
       subdirectory and not to share/ directly.

   12. Changes to a top-level file in the source tree such as
       UPDATING or Makefile.inc1 should be merged directly to that
       file rather than to the root of the whole tree. Yes, this is
       an exception to the first three rules.

   13. When in doubt, ask.

   If you need to merge changes to several places at once (for
   instance, changing a kernel interface and every userland program
   that uses it), merge each target separately, then commit them
   together. For instance, if you merge a revision that changed a
   kernel API and updated all the userland bits that used that API,
   you would merge the kernel change to sys, and the userland bits to
   the appropriate userland directories, then commit all of these in
   one go.

   The source will almost invariably be the same as the target. For
   instance, you will always merge stable/7/lib/libc/ from
   head/lib/libc/. The only exception would be when merging changes
   to code that has moved in the source branch but not in the parent
   branch. For instance, a change to pkill(1) would be merged from
   bin/pkill/ in head to usr.bin/pkill/ in stable/7.

     --------------------------------------------------------------

      3.4.3.3 Preparing the Merge Target

   Because of the mergeinfo propagation issues described earlier, it
   is very important that you never merge changes into a sparse
   working copy. You must always have a full checkout of the branch
   you will merge into. For instance, when merging from HEAD to 7,
   you must have a full checkout of stable/7:

 % cd stable/7
 % svn up --set-depth=infinity

   The target directory must also be up-to-date and must not contain
   any uncommitted changes or stray files.

     --------------------------------------------------------------

      3.4.3.4 Identifying Revisions

   Identifying revisions to be merged is a must. If the target
   already has complete mergeinfo, ask SVN for a list:

 % cd stable/6/contrib/openpam
 % svn mergeinfo --show-revs=eligible $FSVN/head/contrib/openpam

   If the target does not have complete mergeinfo, check the log for
   the merge source.

     --------------------------------------------------------------

      3.4.3.5 Merging

   Now, let's start merging!

     --------------------------------------------------------------

        3.4.3.5.1 The Principles

   Say you would like to merge:

     * revision $R.

     * in directory $target in stable branch $B.

     * from directory $source in head.

     * $FSVN is svn+ssh://svn.freebsd.org/base.

   Assuming that revisions $P and $Q have already been merged, and
   that the current directory is an up-to-date working copy of
   stable/$B, the existing mergeinfo looks like this:

 % svn propget svn:mergeinfo -R $target
 $target - /head/$source:$P,$Q

   Merging is done like so:

 % svn merge -c$R $FSVN/head/$source $target

   Checking the results of this is possible with svn diff.

   The svn:mergeinfo now looks like:

 % svn propget svn:mergeinfo -R $target
 $target - head/$source:$P,$Q,$R

   If the results are not exactly as shown, assistance may be
   required before committing as mistakes may have been made, or
   there may be something wrong with the existing mergeinfo, or there
   may be a bug in Subversion.

     --------------------------------------------------------------

        3.4.3.5.2 Practical Example

   As a practical example, consider the following scenario: The
   changes to netmap.4 in r238987 is to be merged from CURRENT to
   9-STABLE. The file resides in head/share/man/man4 and according to
   Section 3.4.3 this is also where to do the merge. Note that in
   this example all paths are relative to the top of the svn
   repository. for more information on the directory layout, see
   Section 3.2.3.

   The first step is to inspect the existing mergeinfo.

 % svn propget svn:mergeinfo -R stable/9/share/man/man4

   Take a quick note of how it looks before moving on to the next
   step; doing the actual merge:

 % svn merge -c r238987 svn+ssh://svn.freebsd.org/base/head/share/man/man4 stable/9/share/man/man4
 --- Merging r238987 into 'stable/9/share/man/man4':
 U    stable/9/share/man/man4/netmap.4
 --- Recording mergeinfo for merge of r238987 into
 'stable/9/share/man/man4':
  U   stable/9/share/man/man4

   Check that the revision number of the merged revision has been
   added. Once this is verified, the only thing left is the actual
   commit.

 % svn commit stable/9/share/man/man4

     --------------------------------------------------------------

        3.4.3.5.3 Merging into the Kernel (sys/)

   As stated above, merging into the kernel is different from merging
   in the rest of the tree. In many ways merging to the kernel is
   simpler because there is always the same merge target (sys/).

   Once svn merge has been executed, svn diff has to be run on the
   directory to check the changes. This may show some unrelated
   property changes, but these can be ignored. Next, build and test
   the kernel, and, once the tests are complete, commit the code as
   normal, making sure that the commit message starts with "Merge
   r226222 from head", or similar.

     --------------------------------------------------------------

      3.4.3.6 Precautions Before Committing

   As always, build world (or appropriate parts of it).

   Check the changes with svn diff and svn stat. Make sure all the
   files that should have been added or deleted were in fact added or
   deleted.

   Take a closer look at any property change (marked by a M in the
   second column of svn stat). Normally, no svn:mergeinfo properties
   should be anywhere except the target directory (or directories).

   If something looks fishy, ask for help.

     --------------------------------------------------------------

      3.4.3.7 Committing

   Make sure to commit a top level directory to have the mergeinfo
   included as well. Do not specify individual files on the command
   line. For more information about committing files in general, see
   the relevant section of this primer.

     --------------------------------------------------------------

    3.4.4 Vendor imports with SVN

     Important: Please read this entire section before starting a
     vendor import.

     Note: Patches to vendor code fall into two categories:

       * Vendor patches: these are patches that have been issued by
         the vendor, or that have been extracted from the vendor's
         version control system, which address issues which in your
         opinion can't wait until the next vendor release.

       * FreeBSD patches: these are patches that modify the vendor
         code to address FreeBSD-specific issues.

     The nature of a patch dictates where it should be committed:

       * Vendor patches should be committed to the vendor branch, and
         merged from there to head. If the patch addresses an issue
         in a new release that is currently being imported, it must
         not be committed along with the new release: the release
         must be imported and tagged first, then the patch can be
         applied and committed. There is no need to re-tag the vendor
         sources after committing the patch.

       * FreeBSD patches should be committed directly to head.

     --------------------------------------------------------------

      3.4.4.1 Preparing the tree

   If importing for the first time after the switch to Subversion,
   flattening and cleaning up the vendor tree is necessary, as well
   as bootstrapping the merge history in the main tree.

     --------------------------------------------------------------

        3.4.4.1.1 Flattening

   During the conversion from CVS to Subversion, vendor branches were
   imported with the same layout as the main tree. This means that
   the pf vendor sources ended up in vendor/pf/dist/contrib/pf. The
   vendor source is best directly in vendor/pf/dist.

   To flatten the pf tree:

 % cd vendor/pf/dist/contrib/pf
 % svn mv $(svn list) ../..
 % cd ../..
 % svn rm contrib
 % svn propdel -R svn:mergeinfo .
 % svn commit

   The propdel bit is necessary because starting with 1.5, Subversion
   will automatically add svn:mergeinfo to any directory that is
   copied or moved. In this case, as nothing is being merged from the
   deleted tree, they just get in the way.

   Tags may be flattened as well (3, 4, 3.5 etc.); the procedure is
   exactly the same, only changing dist to 3.5 or similar, and
   putting the svn commit off until the end of the process.

     --------------------------------------------------------------

        3.4.4.1.2 Cleaning up

   The dist tree can be cleaned up as necessary. Disabling keyword
   expansion is recommended, as it makes no sense on unmodified
   vendor code and in some cases it can even be harmful. OpenSSH, for
   example, includes two files that originated with FreeBSD and still
   contain the original version tags. To do this:

 % svn propdel svn:keywords -R .
 # svn commit

     --------------------------------------------------------------

        3.4.4.1.3 Bootstrapping merge history

   If importing for the first time after the switch to Subversion,
   bootstrap svn:mergeinfo on the target directory in the main tree
   to the revision that corresponds to the last related change to the
   vendor tree, prior to importing new sources:

 % cd head/contrib/pf
 % svn merge --record-only svn+ssh://svn.freebsd.org/base/vendor/pf/dist@180876 .
 % svn commit

     --------------------------------------------------------------

      3.4.4.2 Importing new sources

   With two commits-one for the import itself and one for the
   tag-this step can optionally be repeated for every upstream
   release between the last import and the current import.

     --------------------------------------------------------------

        3.4.4.2.1 Preparing the vendor sources

   Unlike in CVS where only the needed parts were imported into the
   vendor tree to avoid bloating the main tree, Subversion is able to
   store a full distribution in the vendor tree. So, import
   everything, but merge only what is required.

   A svn add is required to add any files that were added since the
   last vendor import, and svn rm is required to remove any that were
   removed since. Preparing sorted lists of the contents of the
   vendor tree and of the sources that are about to be imported is
   recommended, to facilitate the process.

 % cd vendor/pf/dist
 % svn list -R | grep -v '/$' | sort >../old
 % cd ../pf-4.3
 % find . -type f | cut -c 3- | sort >../new

   With these two files, comm -23 ../old ../new will list removed
   files (files only in old), while comm -13 ../old ../new will list
   added files only in new.

     --------------------------------------------------------------

        3.4.4.2.2 Importing into the vendor tree

   Now, the sources must be copied into dist and the svn add and svn
   rm commands should be used as needed:

 % cd vendor/pf/pf-4.3
 % tar cf - . | tar xf - -C ../dist
 % cd ../dist
 % comm -23 ../old ../new | xargs svn rm
 % comm -13 ../old ../new | xargs svn --parents add

   If any directories were removed, they will have to be svn rmed
   manually. Nothing will break if they are not, but they will remain
   in the tree.

   Check properties on any new files. All text files should have
   svn:eol-style set to native. All binary files should have
   svn:mime-type set to application/octet-stream unless there is a
   more appropriate media type. Executable files should have
   svn:executable set to *. No other properties should exist on any
   file in the tree.

   Committing is now possible, however it is good practice to make
   sure that everything is OK by using the svn stat and svn diff
   commands.

     --------------------------------------------------------------

        3.4.4.2.3 Tagging

   Once committed, vendor releases should be tagged for future
   reference. The best and quickest way to do this is directly in the
   repository:

 % svn cp svn+ssh://svn.freebsd.org/base/vendor/pf/dist svn+ssh://svn.freebsd.org/base/vendor/pf/4.3

   Once that is complete, svn up the working copy of vendor/pf to get
   the new tag, although this is rarely needed.

   If creating the tag in the working copy of the tree, svn:mergeinfo
   results must be removed:

 % cd    vendor/pf
 % svn cp dist 4.3
 % svn propdel svn:mergeinfo -R 4.3

     --------------------------------------------------------------

      3.4.4.3 Merging to head

 % cd head/contrib/pf
 % svn up
 % svn merge --accept=postpone svn+ssh://svn.freebsd.org/base/vendor/pf/dist .

   The --accept=postpone tells Subversion that it shouldn't complain
   because merge conflicts will be taken care of manually.

   It is necessary to resolve any merge conflicts. This process is
   the same in SVN as in CVS.

   Make sure that any files that were added or removed in the vendor
   tree have been properly added or removed in the main tree. To
   check diffs against the vendor branch:

 % svn diff --no-diff-deleted --old=svn+ssh://svn.freebsd.org/base/vendor/pf/dist --new=.

   The --no-diff-deleted tells Subversion not to complain about files
   that are in the vendor tree but not in the main tree, i.e., things
   that would have previously been removed before the vendor import,
   like for example the like the vendor's makefiles and configure
   scripts.

   Using CVS, once a file was off the vendor branch, it was not able
   to be put back. With Subversion, there is no concept of on or off
   the vendor branch. If a file that previously had local
   modifications, to make it not show up in diffs in the vendor tree,
   all that has to be done is remove any left-over cruft like FreeBSD
   version tags, which is much easier.

   If any changes are required for the world to build with the new
   sources, make them now, and keep testing until everything builds
   and runs perfectly.

     --------------------------------------------------------------

      3.4.4.4 Committing the vendor import

   Committing is now possible! Everything must be committed in one
   go. If done properly, the tree will move from a consistent state
   with old code, to a consistent state with new code.

     --------------------------------------------------------------

      3.4.4.5 From scratch

        3.4.4.5.1 Importing into the vendor tree

   This section is an example of importing and tagging byacc into
   head.

   First, prepare the directory in vendor:

 % svn co --depth immediates $FSVN/vendor
 % cd vendor
 % svn mkdir byacc
 % svn mkdir byacc/dist

   Now, import the sources into the dist directory. Once the files
   are in place, svn add the new ones, then svn commit and tag the
   imported version. To save time and bandwidth, direct remote
   committing and tagging is possible:

 % svn cp -m "Tag byacc 20120115" $FSVN/vendor/byacc/dist $FSVN/vendor/byacc/20120115

     --------------------------------------------------------------

        3.4.4.5.2 Merging to head

   Due to this being a new file, copy it for the merge:

 % svn cp -m "Import byacc to contrib" $FSVN/vendor/byacc/dist $FSVN/head/contrib/byacc

   Working normally on newly imported sources is still possible.

     --------------------------------------------------------------

    3.4.5 Reverting a Commit

   Reverting a commit to a previous version is fairly easy:

 % svn merge -r179454:179453 ROADMAP.txt
 % svn commit

   Change number syntax, with negative meaning a reverse change, can
   also be used:

 % svn merge -c -179454 ROADMAP.txt
 % svn commit

   This can also be done directly in the repository:

 % svn merge -r179454:179453 svn+ssh://svn.freebsd.org/base/ROADMAP.txt

     Note: It is important to ensure that the mergeinfo is correct
     when reverting a file in order to permit svn mergeinfo
     --eligible to work as expected.

   Reverting the deletion of a file is slightly different. Copying
   the version of the file that predates the deletion is required.
   For example, to restore a file that was deleted in revision N,
   restore version N-1:

 % svn copy svn+ssh://svn.freebsd.org/base/ROADMAP.txt@179454
 % svn commit

   or, equally:

 % svn copy svn+ssh://svn.freebsd.org/base/ROADMAP.txt@179454 svn+ssh://svn.freebsd.org/base

   Do not simply recreate the file manually and svn add it-this will
   cause history to be lost.

     --------------------------------------------------------------

    3.4.6 Fixing Mistakes

   While we can do surgery in an emergency, do not plan on having
   mistakes fixed behind the scenes. Plan on mistakes remaining in
   the logs forever. Be sure to check the output of svn status and
   svn diff before committing.

   Mistakes will happen but, they can generally be fixed without
   disruption.

   Take a case of adding a file in the wrong location. The right
   thing to do is to svn move the file to the correct location and
   commit. This causes just a couple of lines of metadata in the
   repository journal, and the logs are all linked up correctly.

   The wrong thing to do is to delete the file and then svn add an
   independent copy in the correct location. Instead of a couple of
   lines of text, the repository journal grows an entire new copy of
   the file. This is a waste.

     --------------------------------------------------------------

    3.4.7 Setting up a svnsync Mirror

   You probably do not want to do this unless there is a good reason
   for it. Such reasons might be to support many multiple local
   read-only client machines, or if your network bandwidth is
   limited. Starting a fresh mirror from empty would take a very long
   time. Expect a minimum of 10 hours for high speed connectivity. If
   you have international links, expect this to take 4 to 10 times
   longer.

   A far better option is to grab a seed file. It is large (~1GB) but
   will consume less network traffic and take less time to fetch than
   a svnsync will. This is possible in one of the following three
   ways:

 % rsync -va --partial --progress freefall:/home/peter/svnmirror-base-r179637.tbz2 .

 % rsync -va --partial --progress rsync://repoman.freebsd.org:50873/svnseed/svnmirror-base-r215629.tar.xz .

 % fetch ftp://ftp.freebsd.org/pub/FreeBSD/development/subversion/svnmirror-base-r221445.tar.xz

   Once you have the file, extract it to somewhere like
   home/svnmirror/base/. Then, update it, so that it fetches changes
   since the last revision in the archive:

 % svnsync sync file:///home/svnmirror/base

   You can then set that up to run from cron(8), do checkouts
   locally, set up a svnserve server for your local machines to talk
   to, etc.

   The seed mirror is set to fetch from svn://svn.freebsd.org/base.
   The configuration for the mirror is stored in revprop 0 on the
   local mirror. To see the configuration, try:

 % svn proplist -v --revprop -r 0 file:///home/svnmirror/base

   Use propset to change things.

     --------------------------------------------------------------

    3.4.8 Committing High-ASCII Data

   Files that have high-ASCII bits are considered binary files in
   SVN, so the pre-commit checks fail and indicate that the mime-type
   property should be set to application/octet-stream. However, the
   use of this is discouraged, so please do not set it. The best way
   is always avoiding high-ASCII data, so that it can be read
   everywhere with any text editor but if it is not avoidable,
   instead of changing the mime-type, set the fbsd:notbinary property
   with propset:

 % svn propset fbsd:notbinary yes foo.data

     --------------------------------------------------------------

    3.4.9 Maintaining a Project Branch

   A project branch is one that's synced to head (or another branch)
   is used to develop a project then commit it back to head. In SVN,
   "dolphin" branching is used for this. A "dolphin" branch is one
   that diverges for a while and is finally committed back to the
   original branch. During development code migration in one
   direction (from head to the branch only). No code is committed
   back to head until the end. Once you commit back at the end, the
   branch is dead (although you can have a new branch with the same
   name after you delete the branch if you want).

   As per http://people.freebsd.org/~peter/svn_notes.txt, work that
   is intended to be merged back into HEAD should be in
   base/projects/. If you are doing work that is beneficial to the
   FreeBSD community in some way but not intended to be merged
   directly back into HEAD then the proper location is
   base/user/your-name/. This page contains further details.

   To create a project branch:

 % svn copy svn+ssh://svn.freebsd.org/base/head svn+ssh://svn.freebsd.org/base/projects/spif

   To merge changes from HEAD back into the project branch:

 % cd copy_of_spif
 % svn merge svn+ssh://svn.freebsd.org/base/head
 % svn commit

   It is important to resolve any merge conflicts before committing.

     --------------------------------------------------------------

  3.5 Some Tips

   In commit logs etc., "rev 179872" should be spelled "r179872" as
   per convention.

   Don't remove and re-add the same file in a single commit as this
   will break the CVS exporter.

   Speeding up svn is possible by adding the following to
   ~/.ssh/config:

 Host *
 ControlPath ~/.ssh/sockets/master-%l-%r@%h:%p
 ControlMaster auto
 ControlPersist yes

   and then typing

 mkdir ~/.ssh/sockets

   Checking out a working copy with a stock Subversion client without
   FreeBSD-specific patches (OPTIONS_SET=FREEBSD_TEMPLATE) will mean
   that $FreeBSD$ tags will not be expanded. Once the correct version
   has been installed, trick Subversion into expanding them like so:

 % svn propdel -R svn:keywords .
 % svn revert -R .

   This will wipe out uncommitted patches.

     --------------------------------------------------------------

4 Conventions and Traditions

   As a new developer there are a number of things you should do
   first. The first set is specific to committers only. (If you are
   not a committer, e.g., have GNATS-only access, then your mentor
   needs to do these things for you.)

     --------------------------------------------------------------

  4.1 Guidelines For Committers

     Note: The .ent, .xml, and .xml files listed below exist in the
     FreeBSD Documentation Project SVN repository at
     svn.FreeBSD.org/doc/.

   If you have been given commit rights to one or more of the
   repositories:

     * Add your author entity to head/share/xml/authors.ent; this
       should be done first since an omission of this commit will
       cause the next commits to break the doc/ build.

       This is a relatively easy task, but remains a good first test
       of your version control skills.

         Important: New files that do not have the FreeBSD=%H
         svn:keywords property will be rejected when attempting to
         commit them to the repository. Be sure to read Section 3.3.7
         regarding adding and removing files, in addition to
         verifying that ~/.subversion/config contains the necessary
         "auto-props" entries from auto-props.txt mentioned there.

         Note: Don't forget to get mentor approval for these patches!

     * Also add your author entity to head/share/xml/developers.ent.

     * Add yourself to the "Developers" section of the Contributors
       List
       (head/en_US.ISO8859-1/articles/contributors/contrib.committers.xml)
       and remove yourself from the "Additional Contributors" section
       (head/en_US.ISO8859-1/articles/contributors/contrib.additional.xml).
       Please note that entries are sorted by last name.

     * Add an entry for yourself to head/share/xml/news.xml. Look for
       the other entries that look like "A new committer" and follow
       the format.

     * You should add your PGP or GnuPG key to head/share/pgpkeys
       (and if you do not have a key, you should create one). Do not
       forget to commit the updated head/share/pgpkeys/pgpkeys.ent
       and head/share/pgpkeys/pgpkeys-developers.xml. Please note
       that entries are sorted by last name.

       Dag-Erling C. Smo/rgrav <des@FreeBSD.org> has written a shell
       script (head/share/pgpkeys/addkey.sh) to make this extremely
       simple. See the README file for more information.

         Note: It is important to have an up-to-date PGP/GnuPG key in
         the Handbook, since the key may be required for positive
         identification of a committer, e.g., by the FreeBSD
         Administrators <admins@FreeBSD.org> for account recovery. A
         complete keyring of FreeBSD.org users is available for
         download from http://www.FreeBSD.org/doc/pgpkeyring.txt.

     * Add an entry for yourself to
       src/share/misc/committers-repository.dot, where repository is
       either doc, ports or src, depending on the commit privileges
       you obtained.

     * Some people add an entry for themselves to
       ports/astro/xearth/files/freebsd.committers.markers.

     * Some people add an entry for themselves to
       src/usr.bin/calendar/calendars/calendar.freebsd.

     * If you already have an account at the FreeBSD wiki, make sure
       your mentor moves you from the Contributors group to the
       Developers group. Otherwise, consider signing up for an
       account so you can publish projects and ideas you are working
       on.

     * Once you get access to the wiki, you may add yourself to the
       How We Got Here and Irc Nicks pages.

     * If you subscribe to svn-src-all, svn-ports-all or svn-doc-all,
       you will probably want to unsubscribe to avoid receiving
       duplicate copies of commit messages and their followups.

     Note: All src commits should go to FreeBSD-CURRENT first before
     being merged to FreeBSD-STABLE. No major new features or
     high-risk modifications should be made to the FreeBSD-STABLE
     branch.

     --------------------------------------------------------------

  4.2 Guidelines For Everyone

   Whether or not you have commit rights:

     * Introduce yourself to the other developers, otherwise no one
       will have any idea who you are or what you are working on. You
       do not have to write a comprehensive biography, just write a
       paragraph or two about who you are and what you plan to be
       working on as a developer in FreeBSD. (You should also mention
       who your mentor will be). Email this to the FreeBSD developers
       mailing list and you will be on your way!

     * Log into hub.FreeBSD.org and create a /var/forward/user (where
       user is your username) file containing the e-mail address
       where you want mail addressed to yourusername@FreeBSD.org to
       be forwarded. This includes all of the commit messages as well
       as any other mail addressed to the FreeBSD committer's mailing
       list and the FreeBSD developers mailing list. Really large
       mailboxes which have taken up permanent residence on hub often
       get "accidentally" truncated without warning, so forward it or
       read it and you will not lose it.

       Due to the severe load dealing with SPAM places on the central
       mail servers that do the mailing list processing the front-end
       server does do some basic checks and will drop some messages
       based on these checks. At the moment proper DNS information
       for the connecting host is the only check in place but that
       may change. Some people blame these checks for bouncing valid
       email. If you want these checks turned off for your email you
       can place a file named .spam_lover in your home directory on
       freefall.FreeBSD.org to disable the checks for your email.

     Note: If you are a developer but not a committer, you will not
     be subscribed to the committers or developers mailing lists; the
     subscriptions are derived from the access rights.

     --------------------------------------------------------------

  4.3 Mentors

   All new developers also have a mentor assigned to them for the
   first few months. Your mentor is responsible for teaching you the
   rules and conventions of the project and guiding your first steps
   in the developer community. Your mentor is also personally
   responsible for your actions during this initial period.

   For committers: until your mentor decides (and announces with a
   forced commit to access) that you have learned the ropes and are
   ready to commit on your own, you should not commit anything
   without first getting your mentor's review and approval, and you
   should document that approval with an Approved by: line in the
   commit message.

     --------------------------------------------------------------

5 Preferred License for New Files

   Currently the FreeBSD Project suggests and uses the following text
   as the preferred license scheme:

 /*-
  * Copyright (c) [year] [your name]
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * [id for your version control system, if any]
  */

   The FreeBSD project strongly discourages the so-called
   "advertising clause" in new code. Due to the large number of
   contributors to the FreeBSD project, complying with this clause
   for many commercial vendors has become difficult. If you have code
   in the tree with the advertising clause, please consider removing
   it. In fact, please consider using the above license for your
   code.

   The FreeBSD project discourages completely new licenses and
   variations on the standard licenses. New licenses require the
   approval of <core@FreeBSD.org> to reside in the main repository.
   The more different licenses that are used in the tree, the more
   problems that this causes to those wishing to utilize this code,
   typically from unintended consequences from a poorly worded
   license.

   Project policy dictates that code under some non-BSD licenses must
   be placed only in specific sections of the repository, and in some
   cases, compilation must be conditional or even disabled by
   default. For example, the GENERIC kernel must be compiled under
   only licenses identical to or substantially similar to the BSD
   license. GPL, APSL, CDDL, etc, licensed software must not be
   compiled into GENERIC.

   Developers are reminded that in open source, getting "open" right
   is just as important as getting "source" right, as improper
   handling of intellectual property has serious consequences. Any
   questions or concerns should immediately be brought to the
   attention of the core team.

     --------------------------------------------------------------

6 Developer Relations

   If you are working directly on your own code or on code which is
   already well established as your responsibility, then there is
   probably little need to check with other committers before jumping
   in with a commit. If you see a bug in an area of the system which
   is clearly orphaned (and there are a few such areas, to our
   shame), the same applies. If, however, you are about to modify
   something which is clearly being actively maintained by someone
   else (and it is only by watching the repository-committers mailing
   list that you can really get a feel for just what is and is not)
   then consider sending the change to them instead, just as you
   would have before becoming a committer. For ports, you should
   contact the listed MAINTAINER in the Makefile. For other parts of
   the repository, if you are unsure who the active maintainer might
   be, it may help to scan the revision history to see who has
   committed changes in the past. Bill Fenner <fenner@FreeBSD.org>
   has written a nice shell script that can help determine who the
   active maintainer might be. It lists each person who has committed
   to a given file along with the number of commits each person has
   made. It can be found on freefall at ~fenner/bin/whodid. If your
   queries go unanswered or the committer otherwise indicates a lack
   of interest in the area affected, go ahead and commit it.

   If you are unsure about a commit for any reason at all, have it
   reviewed by -hackers before committing. Better to have it flamed
   then and there rather than when it is part of the repository. If
   you do happen to commit something which results in controversy
   erupting, you may also wish to consider backing the change out
   again until the matter is settled. Remember - with a version
   control system we can always change it back.

   Do not impugn the intentions of someone you disagree with. If they
   see a different solution to a problem than you, or even a
   different problem, it is not because they are stupid, because they
   have questionable parentage, or because they are trying to destroy
   your hard work, personal image, or FreeBSD, but simply because
   they have a different outlook on the world. Different is good.

   Disagree honestly. Argue your position from its merits, be honest
   about any shortcomings it may have, and be open to seeing their
   solution, or even their vision of the problem, with an open mind.

   Accept correction. We are all fallible. When you have made a
   mistake, apologize and get on with life. Do not beat up yourself,
   and certainly do not beat up others for your mistake. Do not waste
   time on embarrassment or recrimination, just fix the problem and
   move on.

   Ask for help. Seek out (and give) peer reviews. One of the ways
   open source software is supposed to excel is in the number of
   eyeballs applied to it; this does not apply if nobody will review
   code.

     --------------------------------------------------------------

7 GNATS

   The FreeBSD Project utilizes GNATS for tracking bugs and change
   requests. Be sure that if you commit a fix or suggestion found in
   a GNATS PR, you use edit-pr pr-number on freefall to close it. It
   is also considered nice if you take time to close any PRs
   associated with your commits, if appropriate. You can also make
   use of send-pr(1) yourself for proposing any change which you feel
   should probably be made, pending a more extensive peer-review
   first.

   You can find out more about GNATS at:

     * FreeBSD Problem Report Handling Guidelines

     * http://www.cs.utah.edu/csinfo/texinfo/gnats/gnats.html

     * http://www.FreeBSD.org/support.html

     * send-pr(1)

   You can run a local copy of GNATS, and then integrate the FreeBSD
   GNATS tree by creating an rsync mirror. Then you can run GNATS
   commands locally, allowing you to query the PR database without an
   Internet connection.

     --------------------------------------------------------------

  7.1 Mirroring the GNATS Tree

   It is possible to mirror the GNATS database by installing
   net/rsync, and executing:

 % rsync -va rsync://bit0.us-west.freebsd.org/FreeBSD-bit/gnats .

     --------------------------------------------------------------

  7.2 Useful Tools

   Other than edit-pr there are a collection of tools in
   ~gnats/tools/ on freefall which can make working with PRs much
   easier.

   open-pr, close-pr, take-pr, and feedback-pr take PR numbers as
   arguments and then ask you to select from a preexisting list of
   change reasons or let you type in your own.

   change-pr is a multi purpose tool that lets you make multiple
   changes at the same time with one command.

   For example, to assign PR 123456 to yourself type take-pr 123456.
   If you want to set the PR to patched awaiting an MFC at the same
   time use: change-pr -t -p -m "awaiting MFC" 123456

     --------------------------------------------------------------

8 Who's Who

   Besides the repository meisters, there are other FreeBSD project
   members and teams whom you will probably get to know in your role
   as a committer. Briefly, and by no means all-inclusively, these
   are:

   Documentation Engineering Team <doceng@FreeBSD.org>

           doceng is the group responsible for the documentation
           build infrastructure, approving new documentation
           committers, and ensuring that the FreeBSD website and
           documentation on the FTP site is up to date with respect
           to the CVS tree. It is not a conflict resolution body. The
           vast majority of documentation related discussion takes
           place on the FreeBSD documentation project mailing list.
           More details regarding the doceng team can be found in its
           charter. Committers interested in contributing to the
           documentation should familiarize themselves with the
           Documentation Project Primer.

   Ruslan Ermilov <ru@FreeBSD.org>

           Ruslan is Mister mdoc(7). If you are writing a manual page
           and need some advice on the structure, or the markup, ask
           Ruslan.

   Bruce Evans <bde@FreeBSD.org>

           Bruce is the Style Police-Meister. When you do a commit
           that could have been done better, Bruce will be there to
           tell you. Be thankful that someone is. Bruce is also very
           knowledgeable on the various standards applicable to
           FreeBSD.

   Konstantin Belousov <kib@FreeBSD.org>, Marc Fonvieille
   <blackend@FreeBSD.org>, Josh Paetzel <jpaetzel@FreeBSD.org>,
   Hiroki Sato <hrs@FreeBSD.org>, Ken Smith <kensmith@FreeBSD.org>

           These are the members of the Release Engineering Team
           <re@FreeBSD.org>. This team is responsible for setting
           release deadlines and controlling the release process.
           During code freezes, the release engineers have final
           authority on all changes to the system for whichever
           branch is pending release status. If there is something
           you want merged from FreeBSD-CURRENT to FreeBSD-STABLE
           (whatever values those may have at any given time), these
           are the people to talk to about it.

           Hiroki is also the keeper of the release documentation
           (src/release/doc/*). If you commit a change that you think
           is worthy of mention in the release notes, please make
           sure he knows about it. Better still, send him a patch
           with your suggested commentary.

   Simon L. Nielsen <simon@FreeBSD.org>

           Simon is the FreeBSD Security Officer and oversees the
           Security Officer Team <security-officer@FreeBSD.org>.

   Garrett Wollman <wollman@FreeBSD.org>

           If you need advice on obscure network internals or are not
           sure of some potential change to the networking subsystem
           you have in mind, Garrett is someone to talk to. Garrett
           is also very knowledgeable on the various standards
           applicable to FreeBSD.

   FreeBSD committer's mailing list

           svn-src-all, svn-ports-all and svn-doc-all are the mailing
           lists that the version control system uses to send commit
           messages to. You should never send email directly to these
           lists. You should only send replies to this list when they
           are short and are directly related to a commit.

   FreeBSD developers mailing list

           All committers are subscribed to -developers. This list
           was created to be a forum for the committers "community"
           issues. Examples are Core voting, announcements, etc.

           The FreeBSD developers mailing list is for the exclusive
           use of FreeBSD committers. In order to develop FreeBSD,
           committers must have the ability to openly discuss matters
           that will be resolved before they are publicly announced.
           Frank discussions of work in progress are not suitable for
           open publication and may harm FreeBSD.

           All FreeBSD committers are reminded to obey the copyright
           of the original author(s) of FreeBSD developers mailing
           list mail. Do not publish or forward messages from the
           FreeBSD developers mailing list outside the list
           membership without permission of all of the authors.

           Copyright violators will be removed from the FreeBSD
           developers mailing list, resulting in a suspension of
           commit privileges. Repeated or flagrant violations may
           result in permanent revocation of commit privileges.

           This list is not intended as a place for code reviews or a
           replacement for the FreeBSD architecture and design
           mailing list. In fact using it as such hurts the FreeBSD
           Project as it gives a sense of a closed list where general
           decisions affecting all of the FreeBSD using community are
           made without being "open". Last, but not least never,
           never ever, email the FreeBSD developers mailing list and
           CC:/BCC: another FreeBSD list. Never, ever email another
           FreeBSD email list and CC:/BCC: the FreeBSD developers
           mailing list. Doing so can greatly diminish the benefits
           of this list.

     --------------------------------------------------------------

9 SSH Quick-Start Guide

    1. If you do not wish to type your password in every time you use
       ssh(1), and you use RSA or DSA keys to authenticate,
       ssh-agent(1) is there for your convenience. If you want to use
       ssh-agent(1), make sure that you run it before running other
       applications. X users, for example, usually do this from their
       .xsession or .xinitrc file. See ssh-agent(1) for details.

    2. Generate a key pair using ssh-keygen(1). The key pair will
       wind up in your $HOME/.ssh/ directory.

    3. Send your public key ($HOME/.ssh/id_dsa.pub or
       $HOME/.ssh/id_rsa.pub) to the person setting you up as a
       committer so it can be put into the yourlogin file in
       /etc/ssh-keys/ on freefall.

   Now you should be able to use ssh-add(1) for authentication once
   per session. This will prompt you for your private key's pass
   phrase, and then store it in your authentication agent
   (ssh-agent(1)). If you no longer wish to have your key stored in
   the agent, issuing ssh-add -d will remove it.

   Test by doing something such as ssh freefall.FreeBSD.org ls /usr.

   For more information, see security/openssh, ssh(1), ssh-add(1),
   ssh-agent(1), ssh-keygen(1), and scp(1).

     --------------------------------------------------------------

10 Coverity Prevent(R) Availability for FreeBSD Committers

   In January 2006, the FreeBSD Foundation obtained a license for
   Coverity Prevent(R) from Coverity(R) Ltd. With this donation, all
   FreeBSD developers can obtain access to Coverity Prevent analysis
   results of all FreeBSD Project software.

   FreeBSD developers who are interested in obtaining access to the
   analysis results of the automated Coverity Prevent runs, can find
   out more by logging into freefall and reading the relevant bits of
   the files:

   /usr/local/coverity/coverity_license.txt

           The license terms to which the FreeBSD developers will
           have to agree in order to use Coverity Prevent analysis
           results.

   /usr/local/coverity/coverity_announcement.txt

           The announcement posted to the developers' mailing list of
           the FreeBSD Project. It contains useful information about
           the FreeBSD Foundation and Coverity Ltd., as well as
           signup information for registering with the Coverity
           Prevent installation of the FreeBSD Cluster.

           After reading and understanding the license terms of
           coverity_license.txt, all FreeBSD developers who are
           interested in using the analysis results of Coverity
           Prevent should read this file.

   /usr/local/coverity/coverity_readme.txt

           A short guide about fixes which are committed to the
           FreeBSD source tree after being detected by Coverity
           Prevent and analyzed by a FreeBSD developer.

   The FreeBSD Wiki includes a mini-guide for developers who are
   interested in working with the Coverity Prevent analysis reports:
   http://wiki.freebsd.org/CoverityPrevent. Please note that this
   mini-guide is only readable by FreeBSD developers, so if you
   cannot access this page, you will have to ask someone to add you
   to the appropriate Wiki access list.

   Finally, all FreeBSD developers who are going to use Coverity
   Prevent are always encouraged to ask for more details and usage
   information, by posting any questions to the mailing list of the
   FreeBSD developers.

     --------------------------------------------------------------

11 The FreeBSD Committers' Big List of Rules

    1. Respect other committers.

    2. Respect other contributors.

    3. Discuss any significant change before committing.

    4. Respect existing maintainers (if listed in the MAINTAINER
       field in Makefile or in the MAINTAINER file in the top-level
       directory).

    5. Any disputed change must be backed out pending resolution of
       the dispute if requested by a maintainer. Security related
       changes may override a maintainer's wishes at the Security
       Officer's discretion.

    6. Changes go to FreeBSD-CURRENT before FreeBSD-STABLE unless
       specifically permitted by the release engineer or unless they
       are not applicable to FreeBSD-CURRENT. Any non-trivial or
       non-urgent change which is applicable should also be allowed
       to sit in FreeBSD-CURRENT for at least 3 days before merging
       so that it can be given sufficient testing. The release
       engineer has the same authority over the FreeBSD-STABLE branch
       as outlined for the maintainer in rule #5.

    7. Do not fight in public with other committers; it looks bad. If
       you must "strongly disagree" about something, do so only in
       private.

    8. Respect all code freezes and read the committers and
       developers mailing lists in a timely manner so you know when a
       code freeze is in effect.

    9. When in doubt on any procedure, ask first!

   10. Test your changes before committing them.

   11. Do not commit to anything under the src/contrib, src/crypto,
       or src/sys/contrib trees without explicit approval from the
       respective maintainer(s).

   As noted, breaking some of these rules can be grounds for
   suspension or, upon repeated offense, permanent removal of commit
   privileges. Individual members of core have the power to
   temporarily suspend commit privileges until core as a whole has
   the chance to review the issue. In case of an "emergency" (a
   committer doing damage to the repository), a temporary suspension
   may also be done by the repository meisters. Only a 2/3 majority
   of core has the authority to suspend commit privileges for longer
   than a week or to remove them permanently. This rule does not
   exist to set core up as a bunch of cruel dictators who can dispose
   of committers as casually as empty soda cans, but to give the
   project a kind of safety fuse. If someone is out of control, it is
   important to be able to deal with this immediately rather than be
   paralyzed by debate. In all cases, a committer whose privileges
   are suspended or revoked is entitled to a "hearing" by core, the
   total duration of the suspension being determined at that time. A
   committer whose privileges are suspended may also request a review
   of the decision after 30 days and every 30 days thereafter (unless
   the total suspension period is less than 30 days). A committer
   whose privileges have been revoked entirely may request a review
   after a period of 6 months has elapsed. This review policy is
   strictly informal and, in all cases, core reserves the right to
   either act on or disregard requests for review if they feel their
   original decision to be the right one.

   In all other aspects of project operation, core is a subset of
   committers and is bound by the same rules. Just because someone is
   in core this does not mean that they have special dispensation to
   step outside any of the lines painted here; core's "special
   powers" only kick in when it acts as a group, not on an individual
   basis. As individuals, the core team members are all committers
   first and core second.

     --------------------------------------------------------------

  11.1 Details

    1. Respect other committers.

       This means that you need to treat other committers as the
       peer-group developers that they are. Despite our occasional
       attempts to prove the contrary, one does not get to be a
       committer by being stupid and nothing rankles more than being
       treated that way by one of your peers. Whether we always feel
       respect for one another or not (and everyone has off days), we
       still have to treat other committers with respect at all
       times, on public forums and in private email.

       Being able to work together long term is this project's
       greatest asset, one far more important than any set of changes
       to the code, and turning arguments about code into issues that
       affect our long-term ability to work harmoniously together is
       just not worth the trade-off by any conceivable stretch of the
       imagination.

       To comply with this rule, do not send email when you are angry
       or otherwise behave in a manner which is likely to strike
       others as needlessly confrontational. First calm down, then
       think about how to communicate in the most effective fashion
       for convincing the other person(s) that your side of the
       argument is correct, do not just blow off some steam so you
       can feel better in the short term at the cost of a long-term
       flame war. Not only is this very bad "energy economics", but
       repeated displays of public aggression which impair our
       ability to work well together will be dealt with severely by
       the project leadership and may result in suspension or
       termination of your commit privileges. The project leadership
       will take into account both public and private communications
       brought before it. It will not seek the disclosure of private
       communications, but it will take it into account if it is
       volunteered by the committers involved in the complaint.

       All of this is never an option which the project's leadership
       enjoys in the slightest, but unity comes first. No amount of
       code or good advice is worth trading that away.

    2. Respect other contributors.

       You were not always a committer. At one time you were a
       contributor. Remember that at all times. Remember what it was
       like trying to get help and attention. Do not forget that your
       work as a contributor was very important to you. Remember what
       it was like. Do not discourage, belittle, or demean
       contributors. Treat them with respect. They are our committers
       in waiting. They are every bit as important to the project as
       committers. Their contributions are as valid and as important
       as your own. After all, you made many contributions before you
       became a committer. Always remember that.

       Consider the points raised under 1 and apply them also to
       contributors.

    3. Discuss any significant change before committing.

       The repository is not where changes should be initially
       submitted for correctness or argued over, that should happen
       first in the mailing lists and the commit should only happen
       once something resembling consensus has been reached. This
       does not mean that you have to ask permission before
       correcting every obvious syntax error or manual page
       misspelling, simply that you should try to develop a feel for
       when a proposed change is not quite such a no-brainer and
       requires some feedback first. People really do not mind
       sweeping changes if the result is something clearly better
       than what they had before, they just do not like being
       surprized by those changes. The very best way of making sure
       that you are on the right track is to have your code reviewed
       by one or more other committers.

       When in doubt, ask for review!

    4. Respect existing maintainers if listed.

       Many parts of FreeBSD are not "owned" in the sense that any
       specific individual will jump up and yell if you commit a
       change to "their" area, but it still pays to check first. One
       convention we use is to put a maintainer line in the Makefile
       for any package or subtree which is being actively maintained
       by one or more people; see  
       http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/developers-handbook/policies.html
       for documentation on this. Where sections of code have several
       maintainers, commits to affected areas by one maintainer need
       to be reviewed by at least one other maintainer. In cases
       where the "maintainer-ship" of something is not clear, you can
       also look at the repository logs for the file(s) in question
       and see if someone has been working recently or predominantly
       in that area.

       Other areas of FreeBSD fall under the control of someone who
       manages an overall category of FreeBSD evolution, such as
       internationalization or networking. See  
       http://www.FreeBSD.org/administration.html for more
       information on this.

    5. Any disputed change must be backed out pending resolution of
       the dispute if requested by a maintainer. Security related
       changes may override a maintainer's wishes at the Security
       Officer's discretion.

       This may be hard to swallow in times of conflict (when each
       side is convinced that they are in the right, of course) but a
       version control system makes it unnecessary to have an ongoing
       dispute raging when it is far easier to simply reverse the
       disputed change, get everyone calmed down again and then try
       to figure out what is the best way to proceed. If the change
       turns out to be the best thing after all, it can be easily
       brought back. If it turns out not to be, then the users did
       not have to live with the bogus change in the tree while
       everyone was busily debating its merits. People very rarely
       call for back-outs in the repository since discussion
       generally exposes bad or controversial changes before the
       commit even happens, but on such rare occasions the back-out
       should be done without argument so that we can get immediately
       on to the topic of figuring out whether it was bogus or not.

    6. Changes go to FreeBSD-CURRENT before FreeBSD-STABLE unless
       specifically permitted by the release engineer or unless they
       are not applicable to FreeBSD-CURRENT. Any non-trivial or
       non-urgent change which is applicable should also be allowed
       to sit in FreeBSD-CURRENT for at least 3 days before merging
       so that it can be given sufficient testing. The release
       engineer has the same authority over the FreeBSD-STABLE branch
       as outlined in rule #5.

       This is another "do not argue about it" issue since it is the
       release engineer who is ultimately responsible (and gets
       beaten up) if a change turns out to be bad. Please respect
       this and give the release engineer your full cooperation when
       it comes to the FreeBSD-STABLE branch. The management of
       FreeBSD-STABLE may frequently seem to be overly conservative
       to the casual observer, but also bear in mind the fact that
       conservatism is supposed to be the hallmark of FreeBSD-STABLE
       and different rules apply there than in FreeBSD-CURRENT. There
       is also really no point in having FreeBSD-CURRENT be a testing
       ground if changes are merged over to FreeBSD-STABLE
       immediately. Changes need a chance to be tested by the
       FreeBSD-CURRENT developers, so allow some time to elapse
       before merging unless the FreeBSD-STABLE fix is critical, time
       sensitive or so obvious as to make further testing unnecessary
       (spelling fixes to manual pages, obvious bug/typo fixes, etc.)
       In other words, apply common sense.

       Changes to the security branches (for example, RELENG_7_0)
       must be approved by a member of the Security Officer Team
       <security-officer@FreeBSD.org>, or in some cases, by a member
       of the Release Engineering Team <re@FreeBSD.org>.

    7. Do not fight in public with other committers; it looks bad. If
       you must "strongly disagree" about something, do so only in
       private.

       This project has a public image to uphold and that image is
       very important to all of us, especially if we are to continue
       to attract new members. There will be occasions when, despite
       everyone's very best attempts at self-control, tempers are
       lost and angry words are exchanged. The best thing that can be
       done in such cases is to minimize the effects of this until
       everyone has cooled back down. That means that you should not
       air your angry words in public and you should not forward
       private correspondence to public mailing lists or aliases.
       What people say one-to-one is often much less sugar-coated
       than what they would say in public, and such communications
       therefore have no place there - they only serve to inflame an
       already bad situation. If the person sending you a
       flame-o-gram at least had the grace to send it privately, then
       have the grace to keep it private yourself. If you feel you
       are being unfairly treated by another developer, and it is
       causing you anguish, bring the matter up with core rather than
       taking it public. Core will do its best to play peace makers
       and get things back to sanity. In cases where the dispute
       involves a change to the codebase and the participants do not
       appear to be reaching an amicable agreement, core may appoint
       a mutually-agreeable 3rd party to resolve the dispute. All
       parties involved must then agree to be bound by the decision
       reached by this 3rd party.

    8. Respect all code freezes and read the committers and
       developers mailing list on a timely basis so you know when a
       code freeze is in effect.

       Committing unapproved changes during a code freeze is a really
       big mistake and committers are expected to keep up-to-date on
       what is going on before jumping in after a long absence and
       committing 10 megabytes worth of accumulated stuff. People who
       abuse this on a regular basis will have their commit
       privileges suspended until they get back from the FreeBSD
       Happy Reeducation Camp we run in Greenland.

    9. When in doubt on any procedure, ask first!

       Many mistakes are made because someone is in a hurry and just
       assumes they know the right way of doing something. If you
       have not done it before, chances are good that you do not
       actually know the way we do things and really need to ask
       first or you are going to completely embarrass yourself in
       public. There is no shame in asking "how in the heck do I do
       this?" We already know you are an intelligent person;
       otherwise, you would not be a committer.

   10. Test your changes before committing them.

       This may sound obvious, but if it really were so obvious then
       we probably would not see so many cases of people clearly not
       doing this. If your changes are to the kernel, make sure you
       can still compile both GENERIC and LINT. If your changes are
       anywhere else, make sure you can still make world. If your
       changes are to a branch, make sure your testing occurs with a
       machine which is running that code. If you have a change which
       also may break another architecture, be sure and test on all
       supported architectures. Please refer to the FreeBSD Internal
       Page for a list of available resources. As other architectures
       are added to the FreeBSD supported platforms list, the
       appropriate shared testing resources will be made available.

   11. Do not commit to anything under the src/contrib, src/crypto,
       and src/sys/contrib trees without explicit approval from the
       respective maintainer(s).

       The trees mentioned above are for contributed software usually
       imported onto a vendor branch. Committing something there,
       even if it does not take the file off the vendor branch, may
       cause unnecessary headaches for those responsible for
       maintaining that particular piece of software. Thus, unless
       you have explicit approval from the maintainer (or you are the
       maintainer), do not commit there!

       Please note that this does not mean you should not try to
       improve the software in question; you are still more than
       welcome to do so. Ideally, you should submit your patches to
       the vendor. If your changes are FreeBSD-specific, talk to the
       maintainer; they may be willing to apply them locally. But
       whatever you do, do not commit there by yourself!

       Contact the FreeBSD core team if you wish to take up
       maintainership of an unmaintained part of the tree.

     --------------------------------------------------------------

  11.2 Policy on Multiple Architectures

   FreeBSD has added several new architecture ports during recent
   release cycles and is truly no longer an i386(TM) centric
   operating system. In an effort to make it easier to keep FreeBSD
   portable across the platforms we support, core has developed the
   following mandate:

     Our 32-bit reference platform is i386, and our 64-bit reference
     platform is sparc64. Major design work (including major API and
     ABI changes) must prove itself on at least one 32-bit and at
     least one 64-bit platform, preferably the primary reference
     platforms, before it may be committed to the source tree.

   The i386 and sparc64 platforms were chosen due to being more
   readily available to developers and as representatives of more
   diverse processor and system designs - big vs little endian,
   register file vs register stack, different DMA and cache
   implementations, hardware page tables vs software TLB management
   etc.

   The ia64 platform has many of the same complications that sparc64
   has, but is still limited in availability to developers.

   We will continue to re-evaluate this policy as cost and
   availability of the 64-bit platforms change.

   Developers should also be aware of our Tier Policy for the long
   term support of hardware architectures. The rules here are
   intended to provide guidance during the development process, and
   are distinct from the requirements for features and architectures
   listed in that section. The Tier rules for feature support on
   architectures at release-time are more strict than the rules for
   changes during the development process.

     --------------------------------------------------------------

  11.3 Other Suggestions

   When committing documentation changes, use a spell checker before
   committing. For all SGML docs, you should also verify that your
   formatting directives are correct by running make lint.

   For all on-line manual pages, run manck (from ports) over the
   manual page to verify all of the cross references and file
   references are correct and that the man page has all of the
   appropriate MLINKs installed.

   Do not mix style fixes with new functionality. A style fix is any
   change which does not modify the functionality of the code. Mixing
   the changes obfuscates the functionality change when asking for
   differences between revisions, which can hide any new bugs. Do not
   include whitespace changes with content changes in commits to doc/
   or www/. The extra clutter in the diffs makes the translators' job
   much more difficult. Instead, make any style or whitespace changes
   in separate commits that are clearly labeled as such in the commit
   message.

     --------------------------------------------------------------

  11.4 Deprecating Features

   When it is necessary to remove functionality from software in the
   base system the following guidelines should be followed whenever
   possible:

    1. Mention is made in the manual page and possibly the release
       notes that the option, utility, or interface is deprecated.
       Use of the deprecated feature generates a warning.

    2. The option, utility, or interface is preserved until the next
       major (point zero) release.

    3. The option, utility, or interface is removed and no longer
       documented. It is now obsolete. It is also generally a good
       idea to note its removal in the release notes.

     --------------------------------------------------------------

12 Support for Multiple Architectures

   FreeBSD is a highly portable operating system intended to function
   on many different types of hardware architectures. Maintaining
   clean separation of Machine Dependent (MD) and Machine Independent
   (MI) code, as well as minimizing MD code, is an important part of
   our strategy to remain agile with regards to current hardware
   trends. Each new hardware architecture supported by FreeBSD adds
   substantially to the cost of code maintenance, toolchain support,
   and release engineering. It also dramatically increases the cost
   of effective testing of kernel changes. As such, there is strong
   motivation to differentiate between classes of support for various
   architectures while remaining strong in a few key architectures
   that are seen as the FreeBSD "target audience".

     --------------------------------------------------------------

  12.1 Statement of General Intent

   The FreeBSD Project targets "production quality commercial
   off-the-shelf (COTS) workstation, server, and high-end embedded
   systems". By retaining a focus on a narrow set of architectures of
   interest in these environments, the FreeBSD Project is able to
   maintain high levels of quality, stability, and performance, as
   well as minimize the load on various support teams on the project,
   such as the ports team, documentation team, security officer, and
   release engineering teams. Diversity in hardware support broadens
   the options for FreeBSD consumers by offering new features and
   usage opportunities (such as support for 64-bit CPUs, use in
   embedded environments, etc.), but these benefits must always be
   carefully considered in terms of the real-world maintenance cost
   associated with additional platform support.

   The FreeBSD Project differentiates platform targets into four
   tiers. Each tier includes a specification of the requirements for
   an architecture to be in that tier, as well as specifying the
   obligations of developers with regards to the platform. In
   addition, a policy is defined regarding the circumstances required
   to change the tier of an architecture.

     --------------------------------------------------------------

  12.2 Tier 1: Fully Supported Architectures

   Tier 1 platforms are fully supported by the security officer,
   release engineering, and toolchain maintenance staff. New features
   added to the operating system must be fully functional across all
   Tier 1 architectures for every release (features which are
   inherently architecture-specific, such as support for hardware
   device drivers, may be exempt from this requirement). In general,
   all Tier 1 platforms must have build and Tinderbox support either
   in the FreeBSD.org cluster, or be easily available for all
   developers. Embedded platforms may substitute an emulator
   available in the FreeBSD cluster for actual hardware.

   Tier 1 architectures are expected to be Production Quality with
   respects to all aspects of the FreeBSD operating system, including
   installation and development environments.

   Tier 1 architectures are expected to be completely integrated into
   the source tree and have all features necessary to produce an
   entire system relevant for that target architecture. Tier 1
   architectures generally have at least 6 active developers.

   Tier 1 architectures are expected to be fully supported by the
   ports system. All the ports should build on a Tier 1 platform, or
   have the appropriate filters to prevent the inappropriate ones
   from building there. The packaging system must support all Tier 1
   architectures. To ensure an architecture's Tier 1 status,
   proponents of that architecture must show that all relevant
   packages can be built on that platform.

   Tier 1 embedded architectures must be able to cross-build packages
   on at least one other Tier 1 architecture. The packages must be
   the most relevant for the platform, but may be a non-empty subset
   of those that build natively.

   Tier 1 architectures must be fully documented. All basic
   operations need to be covered by the handbook or other documents.
   All relevant integration documentation must also be integrated
   into the tree, or readily available.

   Current Tier 1 platforms are i386 and amd64.

     --------------------------------------------------------------

  12.3 Tier 2: Developmental Architectures

   Tier 2 platforms are not supported by the security officer and
   release engineering teams. Platform maintainers are responsible
   for toolchain support in the tree. The toolchain maintainer is
   expected to work with the platform maintainers to refine these
   changes. Major new toolchain components are allowed to break
   support for Tier 2 architectures if the FreeBSD-local changes have
   not been incorporated upstream. The toolchain maintainers are
   expected to provide prompt review of any proposed changes and
   cannot block, through their inaction, changes going into the tree.
   New features added to FreeBSD should be feasible to implement on
   these platforms, but an implementation is not required before the
   feature may be added to the FreeBSD source tree. New features that
   may be difficult to implement on Tier 2 architectures should
   provide a means of disabling them on those architectures. The
   implementation of a Tier 2 architecture may be committed to the
   main FreeBSD tree as long as it does not interfere with production
   work on Tier 1 platforms, or substantially with other Tier 2
   platforms. Before a Tier 2 platform can be added to the FreeBSD
   base source tree, the platform must be able to boot multi-user on
   actual hardware. Generally, there must be at least three active
   developers working on the platform.

   Tier 2 architectures are usually systems targeted at Tier 1
   support, but that are still under development. Architectures
   reaching end of life may also be moved from Tier 1 status to Tier
   2 status as the availability of resources to continue to maintain
   the system in a Production Quality state diminishes. Well
   supported niche architectures may also be Tier 2.

   Tier 2 architectures may have some support for them integrated
   into the ports infrastructure. They may have cross compilation
   support added, at the discretion of portmgr. Some ports must built
   natively into packages if the package system supports that
   architecture. If not integrated into the base system, some
   external patches for the architecture for ports must be available.

   Tier 2 architectures can be integrated into the FreeBSD handbook.
   The basics for how to get a system running must be documented,
   although not necessarily for every single board or system a Tier 2
   architecture supports. The supported hardware list must exist and
   should be no more than a couple of months old. It should be
   integrated into the FreeBSD documentation.

   Current Tier 2 platforms are arm, ia64, pc98, powerpc, and
   sparc64.

     --------------------------------------------------------------

  12.4 Tier 3: Experimental Architectures

   Tier 3 platforms are not supported by the security officer and
   release engineering teams. At the discretion of the toolchain
   maintainer, they may be supported in the toolchain. Tier 3
   platforms are architectures in the early stages of development,
   for non-mainstream hardware platforms, or which are considered
   legacy systems unlikely to see broad future use. New Tier 3
   systems will not be committed to the base source tree. Support for
   Tier 3 systems may be worked on in the FreeBSD Perforce
   Repository, providing source control and easier change integration
   from the main FreeBSD tree. Platforms that transition to Tier 3
   status may be removed from the tree if they are no longer actively
   supported by the FreeBSD developer community at the discretion of
   the release engineer.

   Tier 3 platforms may have ports support, either integrated or
   external, but do not require it.

   Tier 3 platforms must have the basics documented for how to build
   a kernel and how to boot it on at least one target hardware or
   emulation environment. This documentation need not be integrated
   into the FreeBSD tree.

   Current Tier 3 platforms are mips and S/390(R).

     --------------------------------------------------------------

  12.5 Tier 4: Unsupported Architectures

   Tier 4 systems are not supported in any form by the project.

   All systems not otherwise classified into a support tier are Tier
   4 systems.

     --------------------------------------------------------------

  12.6 Policy on Changing the Tier of an Architecture

   Systems may only be moved from one tier to another by approval of
   the FreeBSD Core Team, which shall make that decision in
   collaboration with the Security Officer, Release Engineering, and
   toolchain maintenance teams.

     --------------------------------------------------------------

13 Ports Specific FAQ

   1. Adding a New Port

                13.1.1. How do I add a new port?

                13.1.2. Any other things I need to know when I add a
                new port?

   2. Removing an Existing Port

                13.2.1. How do I remove an existing port?

   3. Re-adding a Deleted Port

                13.3.1. How do I re-add a deleted port?

   4. Repository Copies

                13.4.1. When do we need a repository copy?

                13.4.2. What do I need to do?

   5. Ports Freeze

                13.5.1. What is a "ports freeze"?

                13.5.2. What is a "ports slush" or "feature freeze"?

                13.5.3. How long is a ports freeze or slush?

                13.5.4. What does it mean to me?

                13.5.5. How do I know when the ports slush starts?

                13.5.6. How do I know when the freeze or slush ends?

   6. Creating a New Category

                13.6.1. What is the procedure for creating a new
                category?

                13.6.2. What do I need to do to implement a new
                physical category?

                13.6.3. What do I need to do to implement a new
                virtual category?

   7. Miscellaneous Questions

                13.7.1. How do I know if my port is building
                correctly or not?

                13.7.2. I added a new port. Do I need to add it to
                the INDEX?

                13.7.3. Are there any other files I am not allowed to
                touch?

                13.7.4. What is the proper procedure for updating the
                checksum for a port's distfile when the file changes
                without a version change?

    1. Adding a New Port

   13.1.1. How do I add a new port?

   First, please read the section about repository copies.

   The easiest way to add a new port is to use the addport script
   from your machine (located in the ports/Tools/scripts directory).
   It will add a port from the directory you specify, determining the
   category automatically from the port Makefile. It will also add an
   entry to the port's category Makefile. It was written by Michael
   Haro <mharo@FreeBSD.org>, Will Andrews <will@FreeBSD.org>, and
   Renato Botelho <garga@FreeBSD.org>. When sending questions about
   this script to the FreeBSD ports mailing list, please also CC
   Chris Rees <crees@FreeBSD.org>, the current maintainer.

   13.1.2. Any other things I need to know when I add a new port?

   Check the port, preferably to make sure it compiles and packages
   correctly. This is the recommended sequence:

 # make install
 # make package
 # make deinstall
 # pkg_add package you built above
 # make deinstall
 # make reinstall
 # make package
            

   The Porters Handbook contains more detailed instructions.

   Use portlint(1) to check the syntax of the port. You do not
   necessarily have to eliminate all warnings but make sure you have
   fixed the simple ones.

   If the port came from a submitter who has not contributed to the
   Project before, add that person's name to the Additional
   Contributors section of the FreeBSD Contributors List.

   Close the PR if the port came in as a PR. To close a PR, just do
   edit-pr PR# on freefall and change the state from open to closed.
   You will be asked to enter a log message and then you are done.

    2. Removing an Existing Port

   13.2.1. How do I remove an existing port?

   First, please read the section about repository copies. Before you
   remove the port, you have to verify there are no other ports
   depending on it.

     * Make sure there is no dependency on the port in the ports
       collection:

          * The port's PKGNAME should appear in exactly one line in a
            recent INDEX file.

          * No other ports should contain any reference to the port's
            directory or PKGNAME in their Makefiles

     * Then, remove the port:

         1. Remove the port's files via svn remove.

         2. Remove the SUBDIR listing of the port in the parent
            directory Makefile.

         3. Add an entry to ports/MOVED.

         4. Remove the port from ports/LEGAL if it is there.

   Alternatively, you can use the rmport script, from
   ports/Tools/scripts. This script was written by Vasil Dimov
   <vd@FreeBSD.org>. When sending questions about this script to the
   FreeBSD ports mailing list, please also CC Chris Rees
   <crees@FreeBSD.org>, the current maintainer.

    3. Re-adding a Deleted Port

   13.3.1. How do I re-add a deleted port?

   This is essentially the reverse of deleting a port.

    1. Figure out when the port was removed. Use this list and then
       copy the last living revision of the port:

 % cd /usr/ports/category
                  
 % svn cp 'svn+ssh://svn.freebsd.org/ports/category/portname/@{YYYY-MM-DD}' portname
                  

       Pick a date that is before the removal but after the last true
       commit.

    2. Perform whatever changes are necessary to make the port work
       again. If it was deleted because the distfiles are no longer
       available you will need to volunteer to host them yourself, or
       find someone else to do so.

    3. svn add or svn remove any appropriate files.

    4. Restore the SUBDIR listing of the port in the parent directory
       Makefile, and delete the entry from ports/MOVED.

    5. If the port had an entry in ports/LEGAL, restore it.

    6. svn commit these changes, preferably in one step.

     Tip: addport now detects when the port to add has previously
     existed, and should handle all except the ports/LEGAL step
     automatically.

    4. Repository Copies

   13.4.1. When do we need a repository copy?

   When you want to add a port that is related to any port that is
   already in the tree in a separate directory, you have to do a
   repository copy. Here related means it is a different version or a
   slightly modified version. Examples are print/ghostscript*
   (different versions) and x11-wm/windowmaker* (English-only and
   internationalized version).

   Another example is when a port is moved from one subdirectory to
   another, or when you want to change the name of a directory
   because the author(s) renamed their software even though it is a
   descendant of a port already in a tree.

   13.4.2. What do I need to do?

   With Subversion, a repo copy can be done by any committer:

     * Doing a repo copy:

         1. First make sure that you were using an up to date ports
            tree and the target directory does not exist.

         2. Use svn move or svn copy to do the repo copy.

         3. Upgrade the copied port to the new version. Remember to
            change the LATEST_LINK so there are no duplicate ports
            with the same name. In some rare cases it may be
            necessary to change the PORTNAME instead of LATEST_LINK,
            but this should only be done when it is really needed -
            e.g., using an existing port as the base for a very
            similar program with a different name, or upgrading a
            port to a new upstream version which actually changes the
            distribution name, like the transition from
            textproc/libxml to textproc/libxml2. In most cases,
            changing LATEST_LINK should suffice.

         4. Add the new subdirectory to the SUBDIR listing in the
            parent directory Makefile. You can run make checksubdirs
            in the parent directory to check this.

         5. If the port changed categories, modify the CATEGORIES
            line of the port's Makefile accordingly

         6. Add an entry to ports/MOVED, if you remove the original
            port.

         7. Commit all changes on one commit. A forced commit is no
            longer needed with Subversion.

     * When removing a port:

         1. Perform a thorough check of the ports collection for any
            dependencies on the old port location/name, and update
            them. Running grep on INDEX is not enough because some
            ports have dependencies enabled by compile-time options.
            A full grep -r of the ports collection is recommended.

         2. Remove the old port and the old SUBDIR entry.

         3. Add an entry to ports/MOVED.

     * After repo moves ("rename" operations where a port is copied
       and the old location is removed):

         1. Follow the same steps that are outlined in the previous
            two entries, to activate the new location of the port and
            remove the old one.

    5. Ports Freeze

   13.5.1. What is a "ports freeze"?

   Before a release, it is necessary to restrict commits to the ports
   tree for a short period of time while the packages and the release
   itself are being built. This is to ensure consistency among the
   various parts of the release, and is called the "ports freeze".

   For more information on the background and policies surrounding a
   ports freeze, see the Portmgr Quality Assurance page.

   13.5.2. What is a "ports slush" or "feature freeze"?

   During a release cycle the ports tree may be in a "slush" state
   instead of in a hard freeze. The goal during a slush is to reach a
   stable ports tree to avoid rebuilding large sets of packages for
   the release and to tag the tree. During this time "sweeping
   changes" are prohibited unless specifically permitted by portmgr.
   Complete details about what qualifies as a sweeping change can be
   found on the Portmgr Implementation page.

   The benefit of a slush as opposed to a complete freeze is that it
   allows maintainers to continue adding new ports, making routine
   version updates, and bug fixes to most existing ports, as long as
   the number of affected ports is minimal. For example, updating the
   shared library version on a port that many other ports depend on.

   13.5.3. How long is a ports freeze or slush?

   A freeze only lasts long enough to tag the tree. A slush usually
   lasts a week or two, but may last longer.

   13.5.4. What does it mean to me?

   During a ports freeze, you are not allowed to commit anything to
   the tree without explicit approval from the Ports Management Team.
   "Explicit approval" here means that you send a patch to the Ports
   Management Team for review and get a reply saying, "Go ahead and
   commit it."

   Not everything is allowed to be committed during a freeze. Please
   see the Portmgr Quality Assurance page for more information.

   Note that you do not have implicit permission to fix a port during
   the freeze just because it is broken.

   During a ports slush, you are still allowed to commit but you must
   exercise more caution in what you commit. Furthermore a special
   note (typically "Feature Safe: yes") must be added to the commit
   message.

   13.5.5. How do I know when the ports slush starts?

   The Ports Management Team will send out warning messages to the
   FreeBSD ports mailing list and FreeBSD committer's mailing list
   announcing the start of the impending release, usually two or
   three weeks in advance. The exact starting time will not be
   determined until a few days before the actual release. This is
   because the ports slush has to be synchronized with the release,
   and it is usually not known until then when exactly the release
   will be rolled.

   When the slush starts, there will be another announcement to the
   FreeBSD ports mailing list and FreeBSD committer's mailing list,
   of course.

   13.5.6. How do I know when the freeze or slush ends?

   A few hours after the release, the Ports Management Team will send
   out a mail to the FreeBSD ports mailing list and FreeBSD
   committer's mailing list announcing the end of the ports freeze or
   slush. Note that the release being cut does not automatically
   indicate the end of the freeze. We have to make sure there will be
   no last minute snafus that result in an immediate re-rolling of
   the release.

    6. Creating a New Category

   13.6.1. What is the procedure for creating a new category?

   Please see   Proposing a New Category in the Porter's Handbook.
   Once that procedure has been followed and the PR has been assigned
   to Ports Management Team <portmgr@FreeBSD.org>, it is their
   decision whether or not to approve it. If they do, it is their
   responsibility to do the following:

    1. Perform any needed moves. (This only applies to physical
       categories.)

    2. Update the VALID_CATEGORIES definition in
       ports/Mk/bsd.port.mk.

    3. Assign the PR back to you.

   13.6.2. What do I need to do to implement a new physical category?

   * Upgrade each moved port's Makefile. Do not connect the new
     category to the build yet.

     To do this, you will need to:

      1. Change the port's CATEGORIES (this was the point of the
         exercise, remember?) The new category should be listed
         first. This will help to ensure that the PKGORIGIN is
         correct.

      2. Run a make describe. Since the top-level make index that you
         will be running in a few steps is an iteration of make
         describe over the entire ports hierarchy, catching any
         errors here will save you having to re-run that step later
         on.

      3. If you want to be really thorough, now might be a good time
         to run portlint(1).

   * Check that the PKGORIGINs are correct. The ports system uses
     each port's CATEGORIES entry to create its PKGORIGIN, which is
     used to connect installed packages to the port directory they
     were built from. If this entry is wrong, common port tools like
     pkg_version(1) and portupgrade(1) fail.

     To do this, use the chkorigin.sh tool, as follows: env
     PORTSDIR=/path/to/ports sh -e
     /path/to/ports/Tools/scripts/chkorigin.sh . This will check
     every port in the ports tree, even those not connected to the
     build, so you can run it directly after the move operation.
     Hint: do not forget to look at the PKGORIGINs of any slave ports
     of the ports you just moved!

   * On your own local system, test the proposed changes: first,
     comment out the SUBDIR entries in the old ports' categories'
     Makefiles; then enable building the new category in
     ports/Makefile. Run make checksubdirs in the affected category
     directories to check the SUBDIR entries. Next, in the ports/
     directory, run make index. This can take over 40 minutes on even
     modern systems; however, it is a necessary step to prevent
     problems for other people.

   * Once this is done, you can commit the updated ports/Makefile to
     connect the new category to the build and also commit the
     Makefile changes for the old category or categories.

   * Add appropriate entries to ports/MOVED.

   * Update the documentation by modifying the following:

       * the   list of categories in the Porter's Handbook

       * www/en/ports/categories. Note that these are now displayed
         by sub-groups, as specified in
         www/en/ports/categories.descriptions.

     (Note: these are in the docs, not the ports, repository). If you
     are not a docs committer, you will need to submit a PR for this.

   * Only once all the above have been done, and no one is any longer
     reporting problems with the new ports, should the old ports be
     deleted from their previous locations in the repository.

   It is not necessary to manually update the ports web pages to
   reflect the new category. This is now done automatically via your
   change to www/en/ports/categories and the daily automated rebuild
   of INDEX.

   13.6.3. What do I need to do to implement a new virtual category?

   This is much simpler than a physical category. You only need to
   modify the following:

     * the   list of categories in the Porter's Handbook

     * www/en/ports/categories

    7. Miscellaneous Questions

   13.7.1. How do I know if my port is building correctly or not?

   First, go check http://pointyhat.FreeBSD.org/errorlogs/. There you
   will find error logs from the latest package building runs on all
   supported platforms for the most recent branches.

   However, just because the port does not show up there does not
   mean it is building correctly. (One of the dependencies may have
   failed, for instance.) The relevant directories are available on
   pointyhat under /a/portbuild/<arch>/<major_version> so feel free
   to dig around. Each architecture and version has the following
   subdirectories:

 errors        error logs from latest <major_version> run on <arch>
 logs          all logs from latest <major_version> run on <arch>
 packages      packages from latest <major_version> run on <arch>
 bak/errors    error logs from last complete <major_version> run on <arch>
 bak/logs      all logs from last complete <major_version> run on <arch>
 bak/packages  packages from last complete <major_version> run on <arch>

   Basically, if the port shows up in packages, or it is in logs but
   not in errors, it built fine. (The errors directories are what you
   get from the web page.)

   13.7.2. I added a new port. Do I need to add it to the INDEX?

   No, INDEX is no longer stored in the SVN repository. The file can
   either be generated by running make index, or a pre-generated
   version can be downloaded with make fetchindex.

   13.7.3. Are there any other files I am not allowed to touch?

   Any file directly under ports/, or any file under a subdirectory
   that starts with an uppercase letter (Mk/, Tools/, etc.). In
   particular, the Ports Management Team is very protective of
   ports/Mk/bsd.port*.mk so do not commit changes to those files
   unless you want to face his wra(i)th.

   13.7.4. What is the proper procedure for updating the checksum for
   a port's distfile when the file changes without a version change?

   When the checksum for a port's distfile is updated due to the
   author updating the file without changing the port's revision, the
   commit message should include a summary of the relevant diffs
   between the original and new distfile to ensure that the distfile
   has not been corrupted or maliciously altered. If the current
   version of the port has been in the ports tree for a while, a copy
   of the old distfile will usually be available on the ftp servers;
   otherwise the author or maintainer should be contacted to find out
   why the distfile has changed.

     --------------------------------------------------------------

14 Issues Specific To Developers Who Are Not Committers

   A few people who have access to the FreeBSD machines do not have
   commit bits. For instance, the project is willing to give access
   to the GNATS database to contributors who have shown interest and
   dedication in working on Problem Reports.

   Almost all of this document will apply to these developers as well
   (except things specific to commits and the mailing list
   memberships that go with them). In particular, we recommend that
   you read:

     * Administrative Details

     * Conventions

         Note: You should get your mentor to add you to the
         "Additional Contributors"
         (doc/en_US.ISO8859-1/articles/contributors/contrib.additional.xml),
         if you are not already listed there.

     * Developer Relations

     * SSH Quick-Start Guide

     * The FreeBSD Committers' Big List of Rules

     --------------------------------------------------------------

15 Perks of the Job

   Unfortunately, there are not many perks involved with being a
   committer. Recognition as a competent software engineer is
   probably the only thing that will be of benefit in the long run.
   However, there are at least some perks:

   Free 4-CD and DVD Sets

           FreeBSD committers can get a free 4-CD or DVD set at
           conferences from   FreeBSD Mall, Inc.. The sets are no
           longer available as a subscription due to the high
           shipment costs to countries outside the USA.

   Freenode IRC Cloaks

           FreeBSD developers may request a cloaked hostmask for
           their account on the Freenode IRC network in the form of
           freebsd/developer/freefall name or
           freebsd/developer/NickServ name. To request a cloak, send
           an email to Eitan Adler <eadler@FreeBSD.org> with your
           requested hostmask and NickServ account name.

     --------------------------------------------------------------

16 Miscellaneous Questions

   16.1. Why are trivial or cosmetic changes to files on a vendor
   branch a bad idea?

   16.2. How do I add a new file to a branch?

   16.3. What "meta" information should I include in a commit
   message?

   16.4. How do I access people.FreeBSD.org to put up personal or
   project information?

   16.5. Where are the mailing list archives stored?

   16.6. I would like to mentor a new committer. What process do I
   need to follow?

   16.1. Why are trivial or cosmetic changes to files on a vendor
   branch a bad idea?

   * From now on, every new vendor release of that file will need to
     have patches merged in by hand.

   * From now on, every new vendor release of that file will need to
     have patches verified by hand.

   * The -j option does not work very well. Ask David O'Brien
     <obrien@FreeBSD.org> for horror stories.

   16.2. How do I add a new file to a branch?

   To add a file onto a branch, simply checkout or update to the
   branch you want to add to and then add the file using the add
   operation as you normally would. This works fine for the doc and
   ports trees. The src tree uses SVN and requires more care because
   of the mergeinfo properties. See section 1.4.6 of the   Subversion
   Primer for details. Refer to   SubversionPrimer/Merging for
   details on how to perform an MFC.

   16.3. What "meta" information should I include in a commit
   message?

   As well as including an informative message with each commit you
   may need to include some additional information as well.

   This information consists of one or more lines containing the key
   word or phrase, a colon, tabs for formatting, and then the
   additional information.

   The key words or phrases are:

   PR:            The problem report (if any) which is affected       
                  (typically, by being closed) by this commit.        
                  The name and e-mail address of the person that      
   Submitted by:  submitted the fix; for committers, just the         
                  username on the FreeBSD cluster.                    
                  The name and e-mail address of the person or people 
                  that reviewed the change; for committers, just the  
   Reviewed by:   username on the FreeBSD cluster. If a patch was     
                  submitted to a mailing list for review, and the     
                  review was favorable, then just include the list    
                  name.                                               
                  The name and e-mail address of the person or people 
                  that approved the change; for committers, just the  
                  username on the FreeBSD cluster. It is customary to 
                  get prior approval for a commit if it is to an area 
                  of the tree to which you do not usually commit. In  
   Approved by:   addition, during the run up to a new release all    
                  commits must be approved by the release engineering 
                  team. If these are your first commits then you      
                  should have passed them past your mentor first, and 
                  you should list your mentor, as in                  
                  ``username-of-mentor (mentor)''.                    
   Obtained from: The name of the project (if any) from which the     
                  code was obtained.                                  
                  If you wish to receive an e-mail reminder to MFC at 
   MFC after:     a later date, specify the number of days, weeks, or 
                  months after which an MFC is planned.               
                  If the change is related to a security              
   Security:      vulnerability or security exposure, include one or  
                  more references or a description of the issue.      

   Example 1. Commit log for a commit based on a PR

   You want to commit a change based on a PR submitted by John Smith
   containing a patch. The end of the commit message should look
   something like this.

 ...

 PR:                foo/12345
 Submitted by:      John Smith <John.Smith@example.com>

   Example 2. Commit log for a commit needing review

   You want to change the virtual memory system. You have posted
   patches to the appropriate mailing list (in this case,
   freebsd-arch) and the changes have been approved.

 ...

 Reviewed by:       -arch

   Example 3. Commit log for a commit needing approval

   You want to commit a change to a section of the tree with a
   MAINTAINER assigned. You have collaborated with the listed
   MAINTAINER, who has told you to go ahead and commit.

 ...

 Approved by:        abc

   Where abc is the account name of the person who approved.

   Example 4. Commit log for a commit bringing in code from OpenBSD

   You want to commit some code based on work done in the OpenBSD
   project.

 ...

 Obtained from:      OpenBSD

   Example 5. Commit log for a change to FreeBSD-CURRENT with a
   planned commit to FreeBSD-STABLE to follow at a later date.

   You want to commit some code which will be merged from
   FreeBSD-CURRENT into the FreeBSD-STABLE branch after two weeks.

 ...

 MFC after:      2 weeks

   Where 2 is the number of days, weeks, or months after which an MFC
   is planned. The weeks option may be day, days, week, weeks, month,
   months, or may be left off (in which case, days will be assumed).

   In some cases you may need to combine some of these.

   Consider the situation where a user has submitted a PR containing
   code from the NetBSD project. You are looking at the PR, but it is
   not an area of the tree you normally work in, so you have decided
   to get the change reviewed by the arch mailing list. Since the
   change is complex, you opt to MFC after one month to allow
   adequate testing.

   The extra information to include in the commit would look
   something like

 PR:                 foo/54321
 Submitted by:       John Smith <John.Smith@example.com>
 Reviewed by:        -arch
 Obtained from:      NetBSD
 MFC after:          1 month

   16.4. How do I access people.FreeBSD.org to put up personal or
   project information?

   people.FreeBSD.org is the same as freefall.FreeBSD.org. Just
   create a public_html directory. Anything you place in that
   directory will automatically be visible under
   http://people.FreeBSD.org/.

   16.5. Where are the mailing list archives stored?

   The mailing lists are archived under /g/mail which will show up as
   /hub/g/mail with pwd(1). This location is accessible from any
   machine on the FreeBSD cluster.

   16.6. I would like to mentor a new committer. What process do I
   need to follow?

   See the New Account Creation Procedure document on the internal
   pages.

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