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When some program produces unexpected output, that use of compare-vs-/dev/null will ensure that the surprising output is printed in the test's output. With "test -s err" only, one would have to instrument and rerun in order to see the offending output. * cfg.mk (sc_prohibit_and_fail_1): Exempt 'compare' from this check. * tests/dd/misc.sh: Change "tests -s ... || fail=1" to "compare /dev/null ... && fail=1". * tests/misc/nice.sh: Likewise. * tests/rm/read-only.sh: Likewise. * tests/tail-2/inotify-race.sh: Likewise. * tests/touch/no-dereference.sh: Likewise. Suggested by Jim Meyering in http://lists.gnu.org/archive/html/coreutils/2015-01/msg00042.html
53 lines
1.8 KiB
Bash
Executable File
53 lines
1.8 KiB
Bash
Executable File
#!/bin/sh
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# Ensure that rm -f nonexistent-file-on-read-only-fs succeeds.
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# Copyright (C) 2009-2015 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 <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ rm
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require_root_
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cwd=$(pwd)
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cleanup_() { cd /; umount "$cwd/mnt"; }
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skip=0
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# Create a file system, then mount it.
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dd if=/dev/zero of=blob bs=8192 count=200 > /dev/null 2>&1 \
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|| skip=1
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mkdir mnt || skip=1
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mkfs -t ext2 -F blob \
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|| skip_ "failed to create ext2 file system"
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mount -oloop blob mnt || skip=1
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echo test > mnt/f || skip=1
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test -s mnt/f || skip=1
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mount -o remount,loop,ro mnt || skip=1
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test $skip = 1 \
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&& skip_ "insufficient mount/ext2 support"
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# Applying rm -f to a nonexistent file on a read-only file system must succeed.
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rm -f mnt/no-such > out 2>&1 || fail=1
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# It must produce no diagnostic.
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compare /dev/null out || fail=1
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# However, trying to remove an existing file must fail.
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rm -f mnt/f > out 2>&1 && fail=1
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# with a diagnostic.
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compare /dev/null out && fail=1
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Exit $fail
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