#!/usr/local/bin/ksh93 -p
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
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# $FreeBSD: releng/12.3/tests/sys/cddl/zfs/tests/snapshot/snapshot_017_pos.ksh 329867 2018-02-23 16:31:00Z asomers $

#
# Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# ident	"@(#)snapshot_017_pos.ksh	1.1	08/08/15 SMI"
#

. $STF_SUITE/include/libtest.kshlib

################################################################################
#
# __stc_assertion_start
#
# ID: snapshot_017_pos 
#
# DESCRIPTION:
#
# Directory structure of snapshots reflects filesystem structure.
#
# STRATEGY:
#
# This test makes sure that the directory structure of snapshots is
# a proper reflection of the filesystem the snapshot was taken of.
#
# 1. Create a simple directory structure of files and directories
# 2. Take a snapshot of the filesystem
# 3. Modify original filesystem
# 4. Walk down the snapshot directory structure verifying it
#    checking with both absolute and relative paths
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2007-05-31)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "both"

function cleanup
{
	cd $SAVED_DIR

	if datasetexists $TESTPOOL/$TESTFS ; then
		log_must $ZFS destroy -Rf $TESTPOOL/$TESTFS
	fi

	log_must $ZFS create $TESTPOOL/$TESTFS
	log_must $ZFS set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
}

function verify_structure {

	# check absolute paths
	DIR=$PWD
	verify_file $DIR/file1
	verify_file $DIR/file2
	verify_file $DIR/dir1/file3
	verify_file $DIR/dir1/file4
	verify_file $DIR/dir1/dir2/file5
	verify_file $DIR/dir1/dir2/file6

	verify_no_file $DIR/file99

	# check relative paths
	verify_file ./file1
	verify_file ./file2
	verify_file ./dir1/file3
	verify_file ./dir1/file4
	verify_file ./dir1/dir2/file5
	verify_file ./dir1/dir2/file6

	cd dir1
	verify_file ../file1
	verify_file ../file2
	verify_file ./file3
	verify_file ./file4
	
	verify_no_file ../file99

	cd dir2
	verify_file ./file5
	verify_file ./file6
	verify_file ../file3
	verify_file ../file4
	verify_no_file ../file99

	verify_file ../../file1
	verify_file ../../file2
	verify_no_file ../../file99
}

function verify_file {
	if [ ! -e $1 ]
	then
		log_note "Working dir is $PWD"
		log_fail "File $1 does not exist!"
	fi
}

function verify_no_file {
	if [ -e $1 ]
	then
		log_note "Working dir is $PWD"
		log_fail "File $1 exists when it should not!"
	fi
}

function verify_dir {
	if [ ! -d $1 ]
	then
		log_note "Working dir is $PWD"
		log_fail "Directory $1 does not exist!"
	fi
}

log_assert "Directory structure of snapshots reflects filesystem structure."
log_onexit cleanup

SAVED_DIR=$PWD

#
# Create a directory structure with the following files
#
# ./file1
# ./file2
# ./dir1/file3
# ./dir1/file4
# ./dir1/dir2/file5
# ./dir1/dir2/file6

cd $TESTDIR
$TOUCH file1
$TOUCH file2
$MKDIR dir1
cd dir1
$TOUCH file3
$TOUCH file4
$MKDIR dir2
cd dir2
$TOUCH file5
$TOUCH file6

# Now walk the directory structure verifying it
cd $TESTDIR
verify_structure

# Take snapshots
log_must $ZFS snapshot $TESTPOOL/$TESTFS@snap_a
log_must $ZFS snapshot $TESTPOOL/$TESTFS@snap_b

# Change the filesystem structure by renaming files in the original structure
# The snapshot file structure should not change
cd $TESTDIR
log_must $MV file2 file99
cd dir1
log_must $MV file4 file99
cd dir2
log_must $MV file6 file99

# verify the top level snapshot directories
verify_dir $TESTDIR/$(get_snapdir_name)
verify_dir $TESTDIR/$(get_snapdir_name)
verify_dir $TESTDIR/$(get_snapdir_name)/snap_a
verify_dir $TESTDIR/$(get_snapdir_name)/snap_b

cd $TESTDIR/$(get_snapdir_name)/snap_a
verify_structure

cd $TESTDIR/$(get_snapdir_name)/snap_b
verify_structure

verify_dir $TESTDIR/$(get_snapdir_name)
cd $TESTDIR/$(get_snapdir_name)
verify_dir snap_a
verify_dir snap_b

cd snap_a
verify_dir ../snap_a
verify_dir ../snap_b

cd ..
verify_dir snap_a
verify_dir snap_b

log_pass "Directory structure of snapshots reflects filesystem structure."
