# Process this file with autom4te to create testsuite. -*- Autotest -*-

# Test suite for GNU tar.
# Copyright 2006-2023 Free Software Foundation, Inc.

# This file is part of GNU tar.

# GNU tar is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.

# GNU tar is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Using tar 1.15.x the following equivalent command sets:
#
#   1. tar cf archive file1 file2
# and
#   2. tar cfT archive /dev/null
#      tar rf archive file1
#      tar rt archive file2
#
# produced different archives (GNU format is assumed). It was reported
# by TAMUKI Shoichi on 2006-07-21 [1].
#
# The bug was due to tar being unable to discern between GNU and OLDGNU
# formats and always assuming the latter. The main difference between
# the two is that OLDGNU preserves all bits in the mode field, whereas
# GNU format keeps only the lower 9 ones (mode & 0777).
#
# This was fixed on 2006-07-24 (commit f4e4adea80a) by making tar truncate
# the mode field even in OLDGNU format. Obviously, the fix broke the
# format backward compatibility, but it went unnoticed until 2009-10-03
# (after all, the OLDGNU format is not in much use nowadays), when
# Igor Zhbanov reported it [2].
#
# The final fix was applied on 2009-10-04.
#
# References:
# [1] <200607210526.AA03440@tamuki.linet.gr.jp>
#     http://lists.gnu.org/archive/html/bug-tar/2006-07/msg00029.html
# [2] <f44001920910020335v4cadfesf54f6593d5124814@mail.gmail.com>
#     http://lists.gnu.org/archive/html/bug-tar/2009-10/msg00006.html

# The test case below verifies that the equivalent create and append commands
# produce binary equivalent archives for all formats.

AT_SETUP([append vs. create])
AT_KEYWORDS([append append02 append-gnu])

AT_TAR_CHECK([
genfile --file file1
genfile --file file2

# Make sure file timestamps in the archive will not differ
MTIME="--mtime=@0"

# For PAX archives, we need to make sure extended header names are
# reproducible and that their contents won't change with time
if test $[]TEST_TAR_FORMAT = posix; then
  TAR_OPTIONS="$TAR_OPTIONS --pax-option=exthdr.name=%d/PaxHeaders/%f,delete=mtime,delete=atime,delete=ctime"
fi

echo Creating archive.1
tar $MTIME -cf archive.1 file1 file2

echo Creating archive.2
tar $MTIME -cf archive.2 -T /dev/null
tar $MTIME -rf archive.2 file1
tar $MTIME -rf archive.2 file2

echo Comparing archives
cmp archive.1 archive.2
],
[0],
[Creating archive.1
Creating archive.2
Comparing archives
])

AT_CLEANUP

# End of append02.at