tests/rm/read-only.sh

   1 #!/bin/sh
   2 # Ensure that rm -f nonexistent-file-on-read-only-fs succeeds.
   3
   4 # Copyright (C) 2009-2024 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ rm
  21 require_root_
  22
  23 cwd=$(pwd)
  24 cleanup_() { cd /; umount "$cwd/mnt"; }
  25
  26 skip=0
  27 # Create a file system, then mount it.
  28 dd if=/dev/zero of=blob bs=8192 count=200 > /dev/null 2>&1 \
  29                                              || skip=1
  30 mkdir mnt                                    || skip=1
  31 mkfs -t ext2 -F blob \
  32   || skip_ "failed to create ext2 file system"
  33
  34 mount -oloop blob mnt                        || skip=1
  35 echo test > mnt/f                            || skip=1
  36 test -s mnt/f                                || skip=1
  37 mount -o remount,loop,ro mnt                 || skip=1
  38
  39 test $skip = 1 \
  40   && skip_ "insufficient mount/ext2 support"
  41
  42 # Applying rm -f to a nonexistent file on a read-only file system must succeed.
  43 rm -f mnt/no-such > out 2>&1 || fail=1
  44 # It must produce no diagnostic.
  45 compare /dev/null out || fail=1
  46
  47 # However, trying to remove an existing file must fail.
  48 rm -f mnt/f > out 2>&1 && fail=1
  49 # with a diagnostic.
  50 compare /dev/null out && fail=1
  51
  52 Exit $fail