#!/bin/sh
#-------------------------------------------------------------------------
#
# initdb creates (initializes) a PostgreSQL database cluster (site,
# instance, installation, whatever).  A database cluster is a
# collection of PostgreSQL databases all managed by the same postmaster.
#
# To create the database cluster, we create the directory that contains
# all its data, create the files that hold the global tables, create
# a few other control files for it, and create two databases: the
# template0 and template1 databases.
#
# The template databases are ordinary PostgreSQL databases.  template0
# is never supposed to change after initdb, whereas template1 can be
# changed to add site-local standard data.  Either one can be copied
# to produce a new database.
#
# To create template1, we run the postgres (backend) program in bootstrap
# mode and feed it data from the postgres.bki library file.  After this
# initial bootstrap phase, some additional stuff is created by normal
# SQL commands fed to a standalone backend.  Those commands are just
# embedded into this script (yeah, it's ugly).
#
# template0 is made just by copying the completed template1.
#
#
# Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
# Portions Copyright (c) 1994, Regents of the University of California
#
# $Header: /cvsroot/pgsql-server/src/bin/initdb/Attic/initdb.sh,v 1.142 2001/11/25 22:19:30 petere Exp $
#
#-------------------------------------------------------------------------


##########################################################################
#
# INITIALIZATION

exit_nicely(){
    stty echo > /dev/null 2>&1
    echo 1>&2
    echo "$CMDNAME failed." 1>&2
    if [ "$noclean" != yes ]; then
        if [ "$made_new_pgdata" = yes ]; then
            echo "Removing $PGDATA." 1>&2
            rm -rf "$PGDATA" || echo "Failed." 1>&2
        fi
    else
        echo "Data directory $PGDATA will not be removed at user's request." 1>&2
    fi
    exit 1
}


CMDNAME=`basename $0`

# Placed here during build
VERSION='7.2.5'
bindir='/usr/local/bin'
# Note that "datadir" is not the directory we're initializing, it's
# merely how Autoconf names PREFIX/share.
datadir='/usr/local/share/postgresql'
# as set by configure --enable-multibyte[=XXX].
MULTIBYTE='SQL_ASCII'


# Check for echo -n vs echo \c
if echo '\c' | grep -s c >/dev/null 2>&1
then
    ECHO_N="echo -n"
    ECHO_C=""
else
    ECHO_N="echo"
    ECHO_C='\c'
fi


#
# Find out where we're located
#
if echo "$0" | grep '/' > /dev/null 2>&1 
then
        # explicit dir name given
        self_path=`echo $0 | sed 's,/[^/]*$,,'`       # (dirname command is not portable)
else
        # look for it in PATH ('which' command is not portable)
        for dir in `echo "$PATH" | sed 's/:/ /g'`
	do
                # empty entry in path means current dir
                [ -z "$dir" ] && dir='.'
                if [ -f "$dir/$CMDNAME" ]
		then
                        self_path="$dir"
                        break
                fi
        done
fi


# Check for right version of backend.  First we check for an
# executable in the same directory is this initdb script (presuming
# the above code worked).  Then we fall back to the hard-wired bindir.
# We do it in this order because during upgrades users might move
# their trees to backup places, so $bindir might be inaccurate.

if [ x"$self_path" != x"" ] \
  && [ -x "$self_path/postgres" ] \
  && [ x"`$self_path/postgres -V 2>/dev/null`" = x"postgres (PostgreSQL) $VERSION" ]
then
    PGPATH=$self_path
elif [ -x "$bindir/postgres" ]; then
    if [ x"`$bindir/postgres -V 2>/dev/null`" = x"postgres (PostgreSQL) $VERSION" ]
    then
        PGPATH=$bindir
    else
        # Maybe there was an error message?
        errormsg=`$bindir/postgres -V 2>&1 >/dev/null`
      (
        echo "The program "
        echo "    '$bindir/postgres'"
        echo "needed by $CMDNAME does not belong to PostgreSQL version $VERSION, or"
        echo "there may be a configuration problem."
        if test x"$errormsg" != x""; then
            echo
            echo "This was the error message issued by that program:"
            echo "$errormsg"
        fi
      ) 1>&2
        exit 1
    fi
else
    echo "The program 'postgres' is needed by $CMDNAME but was not found in" 1>&2
    echo "the directory '$bindir'.  Check your installation." 1>&2
    exit 1
fi


# Now we can assume that 'pg_id' belongs to the same version as the
# verified 'postgres' in the same directory.
if [ ! -x "$PGPATH/pg_id" ]; then
    echo "The program 'pg_id' is needed by $CMDNAME but was not found in" 1>&2
    echo "the directory '$PGPATH'.  Check your installation." 1>&2
    exit 1
fi


EffectiveUser=`$PGPATH/pg_id -n -u`
if [ -z "$EffectiveUser" ]; then
    echo "$CMDNAME: could not determine current user name" 1>&2
    exit 1
fi

if [ `$PGPATH/pg_id -u` -eq 0 ]
then
    echo "You cannot run $CMDNAME as root. Please log in (using, e.g., 'su')" 1>&2
    echo "as the (unprivileged) user that will own the server process." 1>&2
    exit 1
fi


short_version=`echo $VERSION | sed -e 's!^\([0-9][0-9]*\.[0-9][0-9]*\).*!\1!'`
if [ x"$short_version" = x"" ] ; then
  echo "$CMDNAME: bug: version number has wrong format" 1>&2
  exit 1
fi


##########################################################################
#
# COMMAND LINE OPTIONS

# 0 is the default (non-)encoding
MULTIBYTEID=0

# Set defaults:
debug=
noclean=
show_setting=

# Note: There is a single compelling reason that the name of the database
#       superuser be the same as the Unix user owning the server process:
#       The single user postgres backend will only connect as the database
#       user with the same name as the Unix user running it. That's
#       a security measure.
POSTGRES_SUPERUSERNAME="$EffectiveUser"

while [ "$#" -gt 0 ]
do
    case "$1" in
        --help|-\?)
                usage=t
                break
                ;;
        --version|-V)
                echo "initdb (PostgreSQL) $VERSION"
                exit 0
                ;;
        --debug|-d)
                debug=yes
                echo "Running with debug mode on."
                ;;
        --show|-s)
        	show_setting=yes
        	;;        
        --noclean|-n)
                noclean=yes
                echo "Running with noclean mode on. Mistakes will not be cleaned up."
                ;;
# The name of the database superuser. Can be freely changed.
        --username|-U)
                POSTGRES_SUPERUSERNAME="$2"
                shift;;
        --username=*)
                POSTGRES_SUPERUSERNAME=`echo $1 | sed 's/^--username=//'`
                ;;
        -U*)
                POSTGRES_SUPERUSERNAME=`echo $1 | sed 's/^-U//'`
                ;;
# The default password of the database superuser.
# Make initdb prompt for the default password of the database superuser.
        --pwprompt|-W)
                PwPrompt=1
                ;;
# Directory where to install the data. No default, unless the environment
# variable PGDATA is set.
        --pgdata|-D)
                PGDATA="$2"
                shift;;
        --pgdata=*)
                PGDATA=`echo $1 | sed 's/^--pgdata=//'`
                ;;
        -D*)
                PGDATA=`echo $1 | sed 's/^-D//'`
                ;;
# The directory where the .bki input files are stored. Normally
# they are in PREFIX/share and this option should be unnecessary.
        -L)
                datadir="$2"
                shift;;
        -L*)
                datadir=`echo $1 | sed 's/^-L//'`
                ;;
# The encoding of the template1 database. Defaults to what you chose
# at configure time. (see above)
        --encoding|-E)
                MULTIBYTE="$2"
                shift;;
        --encoding=*)
                MULTIBYTE=`echo $1 | sed 's/^--encoding=//'`
                ;;
        -E*)
                MULTIBYTE=`echo $1 | sed 's/^-E//'`
                ;;
	-*)
		echo "$CMDNAME: invalid option: $1"
		echo "Try '$CMDNAME --help' for more information."
		exit 1
		;;
        *)
                PGDATA=$1
                ;;
    esac
    shift
done

if [ "$usage" ]; then
    echo "$CMDNAME initializes a PostgreSQL database cluster."
    echo
    echo "Usage:"
    echo "  $CMDNAME [options] datadir"
    echo
    echo "Options:"
    echo " [-D, --pgdata] DATADIR       Location for this database cluster"
    echo "  -W, --pwprompt              Prompt for a password for the new superuser"
    if [ -n "$MULTIBYTE" ] ; then 
        echo "  -E, --encoding ENCODING     Set default encoding for new databases"
    fi
    echo "  -U, --username NAME         Database superuser name"
    echo "Less commonly used options: "
    echo "  -L DIRECTORY                Where to find the input files"
    echo "  -d, --debug                 Generate lots of debugging output"
    echo "  -n, --noclean               Do not clean up after errors"
    echo
    echo "Report bugs to <pgsql-bugs@postgresql.org>."
    exit 0
fi

#-------------------------------------------------------------------------
# Resolve the multibyte encoding name
#-------------------------------------------------------------------------

if [ "$MULTIBYTE" ]
then
	MULTIBYTEID=`$PGPATH/pg_encoding -b $MULTIBYTE`
        if [ "$?" -ne 0 ]
	then
              (
                echo "$CMDNAME: pg_encoding failed"
                echo
                echo "Perhaps you did not configure PostgreSQL for multibyte support or"
                echo "the program was not successfully installed."
              ) 1>&2
                exit 1
        fi
	if [ -z "$MULTIBYTEID" ]
	then
		echo "$CMDNAME: $MULTIBYTE is not a valid backend encoding name" 1>&2
		exit 1
	fi
fi


#-------------------------------------------------------------------------
# Make sure he told us where to build the database system
#-------------------------------------------------------------------------

if [ -z "$PGDATA" ]
then
  (
    echo "$CMDNAME: You must identify where the the data for this database"
    echo "system will reside.  Do this with either a -D invocation"
    echo "option or a PGDATA environment variable."
  ) 1>&2
    exit 1
fi


#-------------------------------------------------------------------------
# Find the input files
#-------------------------------------------------------------------------

POSTGRES_BKI="$datadir"/postgres.bki
POSTGRES_DESCR="$datadir"/postgres.description

PG_HBA_SAMPLE="$datadir"/pg_hba.conf.sample
PG_IDENT_SAMPLE="$datadir"/pg_ident.conf.sample
POSTGRESQL_CONF_SAMPLE="$datadir"/postgresql.conf.sample

if [ "$show_setting" = yes ] || [ "$debug" = yes ]
then
  (
    echo
    echo "initdb variables:"
    for var in PGDATA datadir PGPATH MULTIBYTE MULTIBYTEID \
        POSTGRES_SUPERUSERNAME POSTGRES_BKI \
        POSTGRES_DESCR POSTGRESQL_CONF_SAMPLE \
	PG_HBA_SAMPLE PG_IDENT_SAMPLE ; do
        eval "echo '  '$var=\$$var"
    done
  ) 1>&2
fi

if [ "$show_setting" = yes ] ; then
    exit 0
fi

for PREREQ_FILE in "$POSTGRES_BKI" "$POSTGRES_DESCR" \
    "$PG_HBA_SAMPLE" "$PG_IDENT_SAMPLE" "$POSTGRESQL_CONF_SAMPLE"
do
    if [ ! -f "$PREREQ_FILE" ] ; then
      (
        echo "$CMDNAME does not find the file '$PREREQ_FILE'."
        echo "This means you have a corrupted installation or identified the"
        echo "wrong directory with the -L invocation option."
      ) 1>&2
        exit 1
    fi
done

for file in "$POSTGRES_BKI"
do
     if [ x"`sed 1q $file`" != x"# PostgreSQL $short_version" ]; then
       (
         echo "The input file '$file' needed by $CMDNAME does not"
         echo "belong to PostgreSQL $VERSION.  Check your installation or specify the"
         echo "correct path using the -L option."
       ) 1>&2
         exit 1
     fi
done


trap 'echo "Caught signal." ; exit_nicely' 1 2 3 15

# Let's go
echo "The files belonging to this database system will be owned by user \"$EffectiveUser\"."
echo "This user must also own the server process."
echo

##########################################################################
#
# CREATE DATABASE DIRECTORY

# umask must disallow access to group, other for files and dirs
umask 077

# find out if directory is empty
pgdata_contents=`ls -A "$PGDATA" 2>/dev/null`
if [ x"$pgdata_contents" != x ]
then
    (
      echo "$CMDNAME: The directory $PGDATA exists but is not empty."
      echo "If you want to create a new database system, either remove or empty"
      echo "the directory $PGDATA or run initdb with"
      echo "an argument other than $PGDATA."
    ) 1>&2
    exit 1
else
    if [ ! -d "$PGDATA" ]; then
        $ECHO_N "creating directory $PGDATA... "$ECHO_C
        mkdir -p "$PGDATA" >/dev/null 2>&1 || mkdir "$PGDATA" || exit_nicely
        made_new_pgdata=yes
    else
        $ECHO_N "Fixing permissions on existing directory $PGDATA... "$ECHO_C
	chmod go-rwx "$PGDATA" || exit_nicely
    fi
    echo "ok"

    if [ ! -d "$PGDATA"/base ]
	then
        $ECHO_N "creating directory $PGDATA/base... "$ECHO_C
        mkdir "$PGDATA"/base || exit_nicely
	echo "ok"
    fi
    if [ ! -d "$PGDATA"/global ]
    then
        $ECHO_N "creating directory $PGDATA/global... "$ECHO_C
        mkdir "$PGDATA"/global || exit_nicely
	echo "ok"
    fi
    if [ ! -d "$PGDATA"/pg_xlog ]
    then
        $ECHO_N "creating directory $PGDATA/pg_xlog... "$ECHO_C
        mkdir "$PGDATA"/pg_xlog || exit_nicely
	echo "ok"
    fi
    if [ ! -d "$PGDATA"/pg_clog ]
    then
        $ECHO_N "creating directory $PGDATA/pg_clog... "$ECHO_C
        mkdir "$PGDATA"/pg_clog || exit_nicely
	echo "ok"
    fi
fi


##########################################################################
#
# RUN BKI SCRIPT IN BOOTSTRAP MODE TO CREATE TEMPLATE1

# common backend options
PGSQL_OPT="-F -D$PGDATA"

if [ "$debug" = yes ]
then
    BACKEND_TALK_ARG="-d"
else
    PGSQL_OPT="$PGSQL_OPT -o /dev/null"
fi


$ECHO_N "creating template1 database in $PGDATA/base/1... "$ECHO_C

rm -rf "$PGDATA"/base/1 || exit_nicely
mkdir "$PGDATA"/base/1 || exit_nicely

# Top level PG_VERSION is checked by bootstrapper, so make it first
echo "$short_version" > "$PGDATA/PG_VERSION" || exit_nicely

cat "$POSTGRES_BKI" \
| sed -e "s/POSTGRES/$POSTGRES_SUPERUSERNAME/g" \
      -e "s/ENCODING/$MULTIBYTEID/g" \
| "$PGPATH"/postgres -boot -x1 $PGSQL_OPT $BACKEND_TALK_ARG template1 \
|| exit_nicely

# Make the per-database PGVERSION for template1 only after init'ing it
echo "$short_version" > "$PGDATA/base/1/PG_VERSION" || exit_nicely

echo "ok"

##########################################################################
#
# CREATE CONFIG FILES

$ECHO_N "creating configuration files... "$ECHO_C

cp "$PG_HBA_SAMPLE" "$PGDATA"/pg_hba.conf              || exit_nicely
cp "$PG_IDENT_SAMPLE" "$PGDATA"/pg_ident.conf          || exit_nicely
cp "$POSTGRESQL_CONF_SAMPLE" "$PGDATA"/postgresql.conf || exit_nicely
chmod 0600 "$PGDATA"/pg_hba.conf "$PGDATA"/pg_ident.conf \
	"$PGDATA"/postgresql.conf

echo "ok"

##########################################################################
#
# CREATE VIEWS and other things
#
# NOTE: because here we are driving a standalone backend (not psql), we must
# follow the standalone backend's convention that commands end at a newline.
# To break an SQL command across lines in this script, backslash-escape all
# internal newlines in the command.

PGSQL_OPT="$PGSQL_OPT -O"

$ECHO_N "initializing pg_shadow... "$ECHO_C

"$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null <<EOF
-- Create a trigger so that direct updates to pg_shadow will be written
-- to the flat password file pg_pwd
CREATE TRIGGER pg_sync_pg_pwd AFTER INSERT OR UPDATE OR DELETE ON pg_shadow \
FOR EACH ROW EXECUTE PROCEDURE update_pg_pwd();
-- needs to be done before alter user, because alter user checks that
-- pg_shadow is secure ...
REVOKE ALL on pg_shadow FROM public;
EOF
if [ "$?" -ne 0 ]; then
    exit_nicely
fi
echo "ok"

# set up password
if [ "$PwPrompt" ]; then
    $ECHO_N "Enter new superuser password: "$ECHO_C
    stty -echo > /dev/null 2>&1
    read FirstPw
    stty echo > /dev/null 2>&1
    echo
    $ECHO_N "Enter it again: "$ECHO_C
    stty -echo > /dev/null 2>&1
    read SecondPw
    stty echo > /dev/null 2>&1
    echo
    if [ "$FirstPw" != "$SecondPw" ]; then
        echo "Passwords didn't match." 1>&2
        exit_nicely
    fi
    $ECHO_N "setting password... "$ECHO_C
    "$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null <<EOF
	ALTER USER "$POSTGRES_SUPERUSERNAME" WITH PASSWORD '$FirstPw';
EOF
    if [ "$?" -ne 0 ]; then
	exit_nicely
    fi
    if [ ! -f "$PGDATA"/global/pg_pwd ]; then
        echo
        echo "The password file wasn't generated. Please report this problem." 1>&2
        exit_nicely
    fi
    echo "ok"
fi


$ECHO_N "enabling unlimited row size for system tables... "$ECHO_C

"$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null <<EOF
ALTER TABLE pg_attrdef CREATE TOAST TABLE;
ALTER TABLE pg_description CREATE TOAST TABLE;
ALTER TABLE pg_proc CREATE TOAST TABLE;
ALTER TABLE pg_relcheck CREATE TOAST TABLE;
ALTER TABLE pg_rewrite CREATE TOAST TABLE;
ALTER TABLE pg_statistic CREATE TOAST TABLE;
EOF
if [ "$?" -ne 0 ]; then
    exit_nicely
fi
echo "ok"


$ECHO_N "creating system views... "$ECHO_C

"$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null <<EOF

CREATE VIEW pg_user AS \
    SELECT \
        usename, \
        usesysid, \
        usecreatedb, \
        usetrace, \
        usesuper, \
        usecatupd, \
        '********'::text as passwd, \
        valuntil \
    FROM pg_shadow;

CREATE VIEW pg_rules AS \
    SELECT \
        C.relname AS tablename, \
        R.rulename AS rulename, \
        pg_get_ruledef(R.rulename) AS definition \
    FROM pg_rewrite R, pg_class C \
    WHERE R.rulename !~ '^_RET' \
        AND C.oid = R.ev_class;

CREATE VIEW pg_views AS \
    SELECT \
        C.relname AS viewname, \
        pg_get_userbyid(C.relowner) AS viewowner, \
        pg_get_viewdef(C.relname) AS definition \
    FROM pg_class C \
    WHERE C.relkind = 'v';

-- XXX why does pg_tables include sequences?

CREATE VIEW pg_tables AS \
    SELECT \
        C.relname AS tablename, \
        pg_get_userbyid(C.relowner) AS tableowner, \
        C.relhasindex AS hasindexes, \
        C.relhasrules AS hasrules, \
        (C.reltriggers > 0) AS hastriggers \
    FROM pg_class C \
    WHERE C.relkind IN ('r', 's');

CREATE VIEW pg_indexes AS \
    SELECT \
        C.relname AS tablename, \
        I.relname AS indexname, \
        pg_get_indexdef(X.indexrelid) AS indexdef \
    FROM pg_index X, pg_class C, pg_class I \
    WHERE C.relkind = 'r' AND I.relkind = 'i' \
        AND C.oid = X.indrelid \
        AND I.oid = X.indexrelid;

CREATE VIEW pg_stats AS \
    SELECT \
        relname AS tablename, \
        attname AS attname, \
        stanullfrac AS null_frac, \
        stawidth AS avg_width, \
        stadistinct AS n_distinct, \
        CASE 1 \
            WHEN stakind1 THEN stavalues1 \
            WHEN stakind2 THEN stavalues2 \
            WHEN stakind3 THEN stavalues3 \
            WHEN stakind4 THEN stavalues4 \
        END AS most_common_vals, \
        CASE 1 \
            WHEN stakind1 THEN stanumbers1 \
            WHEN stakind2 THEN stanumbers2 \
            WHEN stakind3 THEN stanumbers3 \
            WHEN stakind4 THEN stanumbers4 \
        END AS most_common_freqs, \
        CASE 2 \
            WHEN stakind1 THEN stavalues1 \
            WHEN stakind2 THEN stavalues2 \
            WHEN stakind3 THEN stavalues3 \
            WHEN stakind4 THEN stavalues4 \
        END AS histogram_bounds, \
        CASE 3 \
            WHEN stakind1 THEN stanumbers1[1] \
            WHEN stakind2 THEN stanumbers2[1] \
            WHEN stakind3 THEN stanumbers3[1] \
            WHEN stakind4 THEN stanumbers4[1] \
        END AS correlation \
    FROM pg_class c, pg_attribute a, pg_statistic s \
    WHERE c.oid = s.starelid AND c.oid = a.attrelid \
        AND a.attnum = s.staattnum \
        AND has_table_privilege(c.oid, 'select');

REVOKE ALL on pg_statistic FROM public;

CREATE VIEW pg_stat_all_tables AS \
    SELECT \
            C.oid AS relid, \
            C.relname AS relname, \
            pg_stat_get_numscans(C.oid) AS seq_scan, \
            pg_stat_get_tuples_returned(C.oid) AS seq_tup_read, \
            sum(pg_stat_get_numscans(I.indexrelid)) AS idx_scan, \
            sum(pg_stat_get_tuples_fetched(I.indexrelid)) AS idx_tup_fetch, \
            pg_stat_get_tuples_inserted(C.oid) AS n_tup_ins, \
            pg_stat_get_tuples_updated(C.oid) AS n_tup_upd, \
            pg_stat_get_tuples_deleted(C.oid) AS n_tup_del \
    FROM pg_class C LEFT OUTER JOIN \
         pg_index I ON C.oid = I.indrelid \
    WHERE C.relkind = 'r' \
    GROUP BY C.oid, C.relname;

CREATE VIEW pg_stat_sys_tables AS \
    SELECT * FROM pg_stat_all_tables \
    WHERE relname ~ '^pg_';

CREATE VIEW pg_stat_user_tables AS \
    SELECT * FROM pg_stat_all_tables \
    WHERE relname !~ '^pg_';

CREATE VIEW pg_statio_all_tables AS \
    SELECT \
            C.oid AS relid, \
            C.relname AS relname, \
            pg_stat_get_blocks_fetched(C.oid) - \
                    pg_stat_get_blocks_hit(C.oid) AS heap_blks_read, \
            pg_stat_get_blocks_hit(C.oid) AS heap_blks_hit, \
            sum(pg_stat_get_blocks_fetched(I.indexrelid) - \
                    pg_stat_get_blocks_hit(I.indexrelid)) AS idx_blks_read, \
            sum(pg_stat_get_blocks_hit(I.indexrelid)) AS idx_blks_hit, \
            pg_stat_get_blocks_fetched(T.oid) - \
                    pg_stat_get_blocks_hit(T.oid) AS toast_blks_read, \
            pg_stat_get_blocks_hit(T.oid) AS toast_blks_hit, \
            pg_stat_get_blocks_fetched(X.oid) - \
                    pg_stat_get_blocks_hit(X.oid) AS tidx_blks_read, \
            pg_stat_get_blocks_hit(X.oid) AS tidx_blks_hit \
    FROM pg_class C LEFT OUTER JOIN \
            pg_index I ON C.oid = I.indrelid LEFT OUTER JOIN \
            pg_class T ON C.reltoastrelid = T.oid LEFT OUTER JOIN \
            pg_class X ON T.reltoastidxid = X.oid \
    WHERE C.relkind = 'r' \
    GROUP BY C.oid, C.relname, T.oid, X.oid;

CREATE VIEW pg_statio_sys_tables AS \
    SELECT * FROM pg_statio_all_tables \
    WHERE relname ~ '^pg_';

CREATE VIEW pg_statio_user_tables AS \
    SELECT * FROM pg_statio_all_tables \
    WHERE relname !~ '^pg_';

CREATE VIEW pg_stat_all_indexes AS \
    SELECT \
            C.oid AS relid, \
            I.oid AS indexrelid, \
            C.relname AS relname, \
            I.relname AS indexrelname, \
            pg_stat_get_numscans(I.oid) AS idx_scan, \
            pg_stat_get_tuples_returned(I.oid) AS idx_tup_read, \
            pg_stat_get_tuples_fetched(I.oid) AS idx_tup_fetch \
    FROM pg_class C, \
            pg_class I, \
            pg_index X \
    WHERE C.relkind = 'r' AND \
            X.indrelid = C.oid AND \
            X.indexrelid = I.oid;

CREATE VIEW pg_stat_sys_indexes AS \
    SELECT * FROM pg_stat_all_indexes \
    WHERE relname ~ '^pg_';

CREATE VIEW pg_stat_user_indexes AS \
    SELECT * FROM pg_stat_all_indexes \
    WHERE relname !~ '^pg_';

CREATE VIEW pg_statio_all_indexes AS \
    SELECT \
            C.oid AS relid, \
            I.oid AS indexrelid, \
            C.relname AS relname, \
            I.relname AS indexrelname, \
            pg_stat_get_blocks_fetched(I.oid) - \
                    pg_stat_get_blocks_hit(I.oid) AS idx_blks_read, \
            pg_stat_get_blocks_hit(I.oid) AS idx_blks_hit \
    FROM pg_class C, \
            pg_class I, \
            pg_index X \
    WHERE C.relkind = 'r' AND \
            X.indrelid = C.oid AND \
            X.indexrelid = I.oid;

CREATE VIEW pg_statio_sys_indexes AS \
    SELECT * FROM pg_statio_all_indexes \
    WHERE relname ~ '^pg_';

CREATE VIEW pg_statio_user_indexes AS \
    SELECT * FROM pg_statio_all_indexes \
    WHERE relname !~ '^pg_';

CREATE VIEW pg_statio_all_sequences AS \
    SELECT \
            C.oid AS relid, \
            C.relname AS relname, \
            pg_stat_get_blocks_fetched(C.oid) - \
                    pg_stat_get_blocks_hit(C.oid) AS blks_read, \
            pg_stat_get_blocks_hit(C.oid) AS blks_hit \
    FROM pg_class C \
    WHERE C.relkind = 'S';

CREATE VIEW pg_statio_sys_sequences AS \
    SELECT * FROM pg_statio_all_sequences \
    WHERE relname ~ '^pg_';

CREATE VIEW pg_statio_user_sequences AS \
    SELECT * FROM pg_statio_all_sequences \
    WHERE relname !~ '^pg_';

CREATE VIEW pg_stat_activity AS \
    SELECT \
            D.oid AS datid, \
            D.datname AS datname, \
            pg_stat_get_backend_pid(S.backendid) AS procpid, \
            pg_stat_get_backend_userid(S.backendid) AS usesysid, \
            U.usename AS usename, \
            pg_stat_get_backend_activity(S.backendid) AS current_query \
    FROM pg_database D, \
            (SELECT pg_stat_get_backend_idset() AS backendid) AS S, \
            pg_shadow U \
    WHERE pg_stat_get_backend_dbid(S.backendid) = D.oid AND \
            pg_stat_get_backend_userid(S.backendid) = U.usesysid;

CREATE VIEW pg_stat_database AS \
    SELECT \
            D.oid AS datid, \
            D.datname AS datname, \
            pg_stat_get_db_numbackends(D.oid) AS numbackends, \
            pg_stat_get_db_xact_commit(D.oid) AS xact_commit, \
            pg_stat_get_db_xact_rollback(D.oid) AS xact_rollback, \
            pg_stat_get_db_blocks_fetched(D.oid) - \
                    pg_stat_get_db_blocks_hit(D.oid) AS blks_read, \
            pg_stat_get_db_blocks_hit(D.oid) AS blks_hit \
    FROM pg_database D;

EOF
if [ "$?" -ne 0 ]; then
    exit_nicely
fi
echo "ok"

$ECHO_N "loading pg_description... "$ECHO_C
(
  cat <<EOF
    CREATE TEMP TABLE tmp_pg_description ( \
	objoid oid, \
	classname name, \
	objsubid int4, \
	description text) WITHOUT OIDS;
    COPY tmp_pg_description FROM STDIN;
EOF
  cat "$POSTGRES_DESCR"
  cat <<EOF
\.
    INSERT INTO pg_description SELECT \
	t.objoid, c.oid, t.objsubid, t.description \
    FROM tmp_pg_description t, pg_class c WHERE c.relname = t.classname;
EOF
) \
	| "$PGPATH"/postgres $PGSQL_OPT template1 > /dev/null || exit_nicely
echo "ok"

$ECHO_N "vacuuming database template1... "$ECHO_C

"$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null <<EOF
VACUUM FULL FREEZE;
EOF
if [ "$?" -ne 0 ]; then
    exit_nicely
fi
echo "ok"

$ECHO_N "copying template1 to template0... "$ECHO_C

"$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null <<EOF
CREATE DATABASE template0;

UPDATE pg_database SET \
	datistemplate = 't', \
	datallowconn = 'f' \
    WHERE datname = 'template0';

-- We use the OID of template0 to determine lastsysoid

UPDATE pg_database SET datlastsysoid = \
    (SELECT oid - 1 FROM pg_database WHERE datname = 'template0');

VACUUM FULL pg_database;
EOF
if [ "$?" -ne 0 ]; then
    exit_nicely
fi
echo "ok"


##########################################################################
#
# FINISHED

echo
echo "Success. You can now start the database server using:"
echo ""
echo "    $PGPATH/postmaster -D $PGDATA"
echo "or"
# (Advertise -l option here, otherwise we have a background
#  process writing to the terminal.)
echo "    $PGPATH/pg_ctl -D $PGDATA -l logfile start"
echo

exit 0
