tar/tests/extrac11.at

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

# Test suite for GNU tar.
# Copyright 2010-2023 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/>.

# written by Paul Eggert

# Check that 'tar' works even in a file-descriptor-limited environment.

AT_SETUP([scarce file descriptors])
AT_KEYWORDS([extract extrac11 chdir])

AT_TAR_CHECK([
exec </dev/null
dirs='a
      a/b
      a/b/c
      a/b/c/d
      a/b/c/d/e
      a/b/c/d/e/f
      a/b/c/d/e/f/g
      a/b/c/d/e/f/g/h
      a/b/c/d/e/f/g/h/i
      a/b/c/d/e/f/g/h/i/j
      a/b/c/d/e/f/g/h/i/j/k
'
files=
mkdir $dirs dest1 dest2 dest3 || exit
for dir in $dirs; do
  for file in X Y Z; do
    echo $file >$dir/$file || exit
    files="$files $file"
  done
done

# Check that "ulimit" itself works.  Close file descriptors before
# invoking ulimit, to work around a bug (or a "feature") in some shells,
# where they squirrel away dups of file descriptors into FD 10 and up
# before closing the originals.
( (exec 3<&- 4<&- 5<&- 6<&- 7<&- 8<&- 9<&- &&
   ulimit -n 100 &&
   tar -cf archive1.tar a &&
   tar -xf archive1.tar -C dest1 a
  ) &&
  diff -r a dest1/a
) >/dev/null 2>&1 ||
   AT_SKIP_TEST

# Another test that "ulimit" itself works:
# tar should fail when completely starved of file descriptors.
( (exec 3<&- 4<&- 5<&- 6<&- 7<&- 8<&- 9<&- &&
   ulimit -n 4 &&
   tar -cf archive2.tar a &&
   tar -xf archive2.tar -C dest2 a
  ) &&
  diff -r a dest2/a
) >/dev/null 2>&1 &&
   AT_SKIP_TEST

# Test if it is possible to limit the number of file descriptors to 10.
( ulimit -n 10 ) >/dev/null 2>&1 || AT_SKIP_TEST
   
# Tar should work when there are few, but enough, file descriptors.
( (exec 3<&- 4<&- 5<&- 6<&- 7<&- 8<&- 9<&- &&
   ulimit -n 10 &&
   tar -cf archive3.tar a &&
   tar -xf archive3.tar -C dest3 a
  ) &&
  diff -r a dest3/a >/dev/null 2>&1
) || { diff -r a dest3/a; exit 1; }
],
[0],[],[],[],[],[gnu])

AT_CLEANUP