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tests: test-N: fix false positives on some systems

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Testing by Assaf Gordon on OSX showed the atime wasn't
being updated when explicitly set back in time.
Also Debian 8.11 / mips64 was seen to not update the
mtime when truncating an empty file.

* tests/misc/test-N.sh: Isolate from different timestamping
behaviors of various (file) systems, by correlating
the timestamps with stat(1) before using `test -N`.
This commit is contained in:
Pádraig Brady
2019-03-06 20:09:16 -08:00
parent bf2f64c7d5
commit b918a20234
1 changed files with 20 additions and 12 deletions
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32
tests/misc/test-N.sh
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@@ -17,26 +17,34 @@
# along with this program. If not, see <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ test
print_ver_ test stat
stat_mtime() { env stat -c '%Y' "$1"; }
stat_atime() { env stat -c '%X' "$1"; }
stat_test_N() { env test "$(stat_mtime "$1")" -gt "$(stat_atime "$1")"; }
# For a freshly touched file, atime should equal mtime: 'test -N' returns 1.
touch file || framework_failure_
stat file
returns_ 1 env test -N file || fail=1
if ! stat_test_N file; then
returns_ 1 env test -N file || fail=1
fi
# Set access time to 2 days ago: 'test -N' returns 0.
touch -a -d "12:00 today -2 days" file || framework_failure_
stat file
env test -N file || fail=1
touch -a -d '12:00 today -2 days' file || framework_failure_
if stat_test_N file; then
env test -N file || fail=1
fi
# Set mtime to 2 days before atime: 'test -N' returns 1;
touch -m -d "12:00 today -4 days" file || framework_failure_
stat file
returns_ 1 env test -N file || fail=1
touch -m -d '12:00 today -4 days' file || framework_failure_
if ! stat_test_N file; then
returns_ 1 env test -N file || fail=1
fi
# Now modify the file: 'test -N' returns 0.
> file || framework_failure_
stat file
env test -N file || fail=1
echo 'data' > file || framework_failure_
if stat_test_N file; then
env test -N file || fail=1
fi
Exit $fail