diff options
Diffstat (limited to '')
| -rwxr-xr-x | tests/mv/atomic.sh | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tests/mv/atomic.sh b/tests/mv/atomic.sh new file mode 100755 index 0000000..57ac442 --- /dev/null +++ b/tests/mv/atomic.sh @@ -0,0 +1,46 @@ +#!/bin/sh +# ensure that mv doesn't first unlink its destination in one particular case + +# Copyright (C) 2006-2018 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_ mv +require_strace_ unlink + +# Before the fix, mv would unnecessarily unlink the destination symlink: +# $ rm -rf s[12]; ln -s / s1; ln -s /tmp s2 +# $ strace -qe unlink /bin/mv -T s1 s2 +# unlink("s2") = 0 +# +# With the fix, it doesn't call unlink: +# $ rm -rf s[12]; ln -s / s1; ln -s /tmp s2 +# $ strace -qe unlink ./mv -T s1 s2 +# $ + +ln -s t1 s1 || framework_failure_ +ln -s t2 s2 || framework_failure_ + + +strace -qe unlink mv -T s1 s2 > out 2>&1 || fail=1 +$EGREP 'unlink.*"s1"' out && fail=1 + +# Ensure that the source, s1, is gone. +ls -dl s1 > /dev/null 2>&1 && fail=1 + +# Ensure that the destination, s2, contains the link from s1. +test "$(readlink s2)" = t1 || fail=1 + +Exit $fail |