59 lines
1.9 KiB
Bash
Executable file
59 lines
1.9 KiB
Bash
Executable file
#!/bin/sh
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# Ensure that df /dev/loop0 errors out if overmounted by another device
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# Copyright (C) 2014-2025 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ df
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require_root_
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cwd=$(pwd)
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cleanup_() { cd /; umount "$cwd/mnt"; umount "$cwd/mnt"; }
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skip=0
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# Create 2 file systems
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for i in 1 2; do
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dd if=/dev/zero of=blob$i bs=8192 count=200 > /dev/null 2>&1 \
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|| skip=1
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mkfs -t ext2 -F blob$i \
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|| skip_ "failed to create ext2 file system"
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done
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# Mount both at the same place (eclipsing the first)
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mkdir mnt || skip=1
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mount -oloop blob1 mnt || skip=1
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eclipsed_dev=$(df --o=source mnt | tail -n1) || skip=1
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mount -oloop blob2 mnt || skip=1
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test $skip = 1 \
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&& skip_ "insufficient mount/ext2 support"
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df . || skip_ "failed to lookup the device for the current dir"
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echo "df: cannot access '$eclipsed_dev': over-mounted by another device" > exp
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# We should get an error for the eclipsed device and continue
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df $eclipsed_dev . > out 2> err && fail=1
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# header and single entry in output
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test $(wc -l < out) = 2 || fail=1
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compare exp err || fail=1
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test "$fail" = 1 && dump_mount_list_
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Exit $fail
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