tests/cp/abuse.sh

   1 #!/bin/sh
   2 # ensure that cp does not write through a just-copied symlink
   3
   4 # Copyright (C) 2007-2023 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_ cp
  21
  22 mkdir a b c || framework_failure_
  23 ln -s ../t a/1 || framework_failure_
  24 echo payload > b/1 || framework_failure_
  25
  26 echo "cp: will not copy 'b/1' through just-created symlink 'c/1'" \
  27   > exp || framework_failure_
  28
  29 # Check both cases: a dangling symlink, and one pointing to a writable file.
  30
  31 for i in dangling-dest existing-dest; do
  32   test $i = existing-dest && echo i > t
  33   test $i = dangling-dest && rm -f t
  34
  35   cp -dR a/1 b/1 c 2> out && fail=1
  36
  37   compare exp out || fail=1
  38
  39   # When the destination is a dangling symlink,
  40   # ensure that cp does not create it.
  41   test $i = dangling-dest \
  42     && test -f t && fail=1
  43
  44   # When the destination symlink points to a writable file,
  45   # ensure that cp does not change it.
  46   test $i = existing-dest \
  47     && case $(cat t) in i);; *) fail=1;; esac
  48 done
  49
  50 Exit $fail