tests/df/over-mount-device.sh

   1 #!/bin/sh
   2 # Ensure that df /dev/loop0 errors out if overmounted by another device
   3
   4 # Copyright (C) 2014-2017 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ df
  21 require_root_
  22
  23 cwd=$(pwd)
  24 cleanup_() { cd /; umount "$cwd/mnt"; umount "$cwd/mnt"; }
  25
  26 skip=0
  27
  28 # Create 2 file systems
  29 for i in 1 2; do
  30   dd if=/dev/zero of=blob$i bs=8192 count=200 > /dev/null 2>&1 \
  31                                              || skip=1
  32   mkfs -t ext2 -F blob$i \
  33     || skip_ "failed to create ext2 file system"
  34 done
  35
  36 # Mount both at the same place (eclipsing the first)
  37 mkdir mnt                                    || skip=1
  38 mount -oloop blob1 mnt                       || skip=1
  39 eclipsed_dev=$(df --o=source mnt | tail -n1) || skip=1
  40 mount -oloop blob2 mnt                       || skip=1
  41
  42 test $skip = 1 \
  43   && skip_ "insufficient mount/ext2 support"
  44
  45 df . || skip_ "failed to lookup the device for the current dir"
  46
  47 echo "df: cannot access '$eclipsed_dev': over-mounted by another device" > exp
  48
  49 # We should get an error for the eclipsed device and continue
  50 df $eclipsed_dev . > out 2> err && fail=1
  51
  52 # header and single entry in output
  53 test $(wc -l < out) = 2 || fail=1
  54
  55 compare exp err || fail=1
  56
  57 test "$fail" = 1 && dump_mount_list_
  58
  59 Exit $fail