tests/cp/file-perm-race

   1 #!/bin/sh
   2 # Make sure cp -p isn't too generous with file permissions.
   3
   4 # Copyright (C) 2006-2012 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 <http://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  20 print_ver_ cp
  21
  22 # cp -p gives ENOTSUP on NFS on Linux 2.6.9 at least
  23 require_local_dir_
  24
  25 umask 022
  26 mkfifo_or_skip_ fifo
  27
  28 # Copy a fifo's contents.  That way, we can examine the
  29 # destination permissions before they're finalized.
  30 cp -p --copy-contents fifo fifo-copy &
  31 cp_pid=$!
  32
  33 (
  34   # Now 'cp' is reading the fifo.  Wait for the destination file to
  35   # be created, encouraging things along by echoing to the fifo.
  36   while test ! -f fifo-copy; do
  37     echo foo
  38   done
  39
  40   # Check the permissions of the destination.
  41   ls -l fifo-copy >ls.out
  42
  43   # Close the fifo so that "cp" can continue.  But output first,
  44   # before exiting, otherwise some shells would optimize away the file
  45   # descriptor that holds the fifo open.
  46   echo foo
  47 ) >fifo
  48
  49 case `cat ls.out` in
  50 -???------*) ;;
  51 *) fail=1;;
  52 esac
  53
  54 wait $cp_pid || fail=1
  55
  56 Exit $fail