tests/touch/no-dereference.sh

   1 #!/bin/sh
   2 # Ensure that touch -h works.
   3
   4 # Copyright (C) 2009-2019 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ touch test
  21
  22 ln -s nowhere dangling || framework_failure_
  23 touch file || framework_failure_
  24 ln -s file link || framework_failure_
  25
  26
  27 # These first tests should work on every platform.
  28 # -h does not create files, but it warns.  Use -c to silence warning.
  29 returns_ 1 touch -h no-file 2> err || fail=1
  30 compare /dev/null err && fail=1
  31 touch -h -c no-file 2> err || fail=1
  32 compare /dev/null err || fail=1
  33
  34 # -h works on regular files
  35 touch -h file || fail=1
  36
  37 # -h coupled with -r uses timestamp of the symlink, not the referent.
  38 touch -h -r dangling file || fail=1
  39 test -f nowhere && fail=1
  40
  41 # The remaining tests of -h require kernel support for changing symlink times.
  42 grep '^#define HAVE_UTIMENSAT 1' "$CONFIG_HEADER" > /dev/null ||
  43 grep '^#define HAVE_LUTIMES 1' "$CONFIG_HEADER" > /dev/null ||
  44   skip_ 'this system lacks the utimensat function'
  45
  46 # Changing time of dangling symlink is okay.
  47 # Skip the test if this fails, but the error text corresponds to
  48 # ENOSYS (possible with old kernel but new glibc).
  49 touch -h dangling 2> err
  50 case $? in
  51   0) test -f nowhere && fail=1
  52      compare /dev/null err || fail=1;;
  53   1) grep 'Function not implemented' err \
  54        && skip_ 'this system lacks the utimensat function'
  55      fail=1;;
  56   *) fail=1;;
  57 esac
  58
  59 # Change the mtime of a symlink.
  60 touch -m -h -d 2009-10-10 link || fail=1
  61 case $(stat --format=%y link) in
  62   2009-10-10*) ;;
  63   *) fail=1 ;;
  64 esac
  65 case $(stat --format=%y file) in
  66   2009-10-10*) fail=1;;
  67 esac
  68
  69 # Test interactions with -.
  70 touch -h - > file || fail=1
  71
  72 # If >&- works, test "touch -ch -" etc.
  73 # >&- apparently does not work in HP-UX 11.23.
  74 # This test is ineffective unless /dev/stdout also works.
  75 # If stdout is open, it is not a symlink.
  76 if env test -w /dev/stdout >/dev/null &&
  77    env test ! -w /dev/stdout >&-; then
  78   returns_ 1 touch -h - >&- || fail=1
  79   touch -h -c - >&- || fail=1
  80 fi
  81
  82 Exit $fail