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test-lib: introduce API for verifying file mtime

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Add functions `test_set_magic_mtime` and `test_is_magic_mtime` which can
be used to (re)set the mtime of a file to a predefined ("magic")
timestamp, then perform some operations and finally check for mtime
changes of the file.

The core implementation follows the suggestion from the
mailing list [1].

[1] https://lore.kernel.org/git/xmqqczl5hpaq.fsf@gitster.g/T/#u

Signed-off-by: Marc Strapetz <marc.strapetz@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Marc Strapetz 2022-01-07 11:17:28 +00:00 committed by Junio C Hamano
parent dcc0cd074f
commit ab6245bdee
1 changed files with 33 additions and 0 deletions
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33
t/test-lib-functions.sh
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@ -1806,3 +1806,36 @@ test_region () {
test_readlink () {
perl -le 'print readlink($_) for @ARGV' "$@"
}
# Set mtime to a fixed "magic" timestamp in mid February 2009, before we
# run an operation that may or may not touch the file. If the file was
# touched, its timestamp will not accidentally have such an old timestamp,
# as long as your filesystem clock is reasonably correct. To verify the
# timestamp, follow up with test_is_magic_mtime.
#
# An optional increment to the magic timestamp may be specified as second
# argument.
test_set_magic_mtime () {
local inc=${2:-0} &&
local mtime=$((1234567890 + $inc)) &&
test-tool chmtime =$mtime "$1" &&
test_is_magic_mtime "$1" $inc
}
# Test whether the given file has the "magic" mtime set. This is meant to
# be used in combination with test_set_magic_mtime.
#
# An optional increment to the magic timestamp may be specified as second
# argument. Usually, this should be the same increment which was used for
# the associated test_set_magic_mtime.
test_is_magic_mtime () {
local inc=${2:-0} &&
local mtime=$((1234567890 + $inc)) &&
echo $mtime >.git/test-mtime-expect &&
test-tool chmtime --get "$1" >.git/test-mtime-actual &&
test_cmp .git/test-mtime-expect .git/test-mtime-actual
local ret=$?
rm -f .git/test-mtime-expect
rm -f .git/test-mtime-actual
return $ret
}