tests/truncate/truncate-owned-by-other.sh

   1 #!/bin/sh
   2 # Demonstrate that "truncate -s0 writable-but-owned-by-other" works.
   3
   4 # Copyright (C) 2008-2024 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_ truncate
  21
  22 require_root_
  23
  24 # Create a file owned by root, and writable by $NON_ROOT_USERNAME.
  25 echo > root-owned || framework_failure_
  26 chgrp +$NON_ROOT_GID . root-owned || framework_failure_
  27 chmod g+w root-owned
  28
  29 # Ensure that the current directory is searchable by $NON_ROOT_USERNAME.
  30 chmod g+x .
  31
  32 chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
  33   truncate -s0 root-owned || fail=1
  34
  35 Exit $fail