diff options
Diffstat (limited to 'tests/df/over-mount-device.sh')
-rwxr-xr-x | tests/df/over-mount-device.sh | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/tests/df/over-mount-device.sh b/tests/df/over-mount-device.sh new file mode 100755 index 0000000..9629f20 --- /dev/null +++ b/tests/df/over-mount-device.sh @@ -0,0 +1,59 @@ +#!/bin/sh +# Ensure that df /dev/loop0 errors out if overmounted by another device + +# Copyright (C) 2014-2022 Free Software Foundation, Inc. + +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <https://www.gnu.org/licenses/>. + +. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src +print_ver_ df +require_root_ + +cwd=$(pwd) +cleanup_() { cd /; umount "$cwd/mnt"; umount "$cwd/mnt"; } + +skip=0 + +# Create 2 file systems +for i in 1 2; do + dd if=/dev/zero of=blob$i bs=8192 count=200 > /dev/null 2>&1 \ + || skip=1 + mkfs -t ext2 -F blob$i \ + || skip_ "failed to create ext2 file system" +done + +# Mount both at the same place (eclipsing the first) +mkdir mnt || skip=1 +mount -oloop blob1 mnt || skip=1 +eclipsed_dev=$(df --o=source mnt | tail -n1) || skip=1 +mount -oloop blob2 mnt || skip=1 + +test $skip = 1 \ + && skip_ "insufficient mount/ext2 support" + +df . || skip_ "failed to lookup the device for the current dir" + +echo "df: cannot access '$eclipsed_dev': over-mounted by another device" > exp + +# We should get an error for the eclipsed device and continue +df $eclipsed_dev . > out 2> err && fail=1 + +# header and single entry in output +test $(wc -l < out) = 2 || fail=1 + +compare exp err || fail=1 + +test "$fail" = 1 && dump_mount_list_ + +Exit $fail |