| # Ensure that df /dev/loop0 errors out if overmounted by another device | |
| # Copyright (C) 2014-2025 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 | |