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dir: fix directory-matching bug 

This reverts the change from ed49584 (dir: fix pattern matching on dirs,
2021-09-24), which claimed to fix a directory-matching problem without a
test case. It turns out to _create_ a bug, but it is a bit subtle.

The bug would have been revealed by the first of two tests being added to
t0008-ignores.sh. The first uses a pattern "/git/" inside the a/.gitignores
file, which matches against 'a/git/foo' but not 'a/git-foo/bar'. This test
would fail before the revert.

The second test shows what happens if the test instead uses a pattern "git/"
and this test passes both before and after the revert.

The difference in these two cases are due to how
last_matching_pattern_from_list() checks patterns both if they have the
PATTERN_FLAG_MUSTBEDIR and PATTERN_FLAG_NODIR flags. In the case of "git/",
the PATTERN_FLAG_NODIR is also provided, making the change in behavior in
match_pathname() not affect the end result of
last_matching_pattern_from_list().

Reported-by: Glen Choo <chooglen@google.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2021-11-02 10:40:06 -04:00 committed by Junio C Hamano
parent 6579e788c0
commit 5ceb663e92
2 changed files with 27 additions and 1 deletions
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2
dir.c
View File

@ -1294,7 +1294,7 @@ int match_pathname(const char *pathname, int pathlen,
* then our prefix match is all we need; we
* do not need to call fnmatch at all.
*/
if (!patternlen && (!namelen || (flags & PATTERN_FLAG_MUSTBEDIR)))
if (!patternlen && !namelen)
return 1;
}

26
t/t0008-ignores.sh
View File

@ -802,6 +802,32 @@ test_expect_success 'existing directory and file' '
grep top-level-dir actual
'
test_expect_success 'exact prefix matching (with root)' '
test_when_finished rm -r a &&
mkdir -p a/git a/git-foo &&
touch a/git/foo a/git-foo/bar &&
echo /git/ >a/.gitignore &&
git check-ignore a/git a/git/foo a/git-foo a/git-foo/bar >actual &&
cat >expect <<-\EOF &&
a/git
a/git/foo
EOF
test_cmp expect actual
'
test_expect_success 'exact prefix matching (without root)' '
test_when_finished rm -r a &&
mkdir -p a/git a/git-foo &&
touch a/git/foo a/git-foo/bar &&
echo git/ >a/.gitignore &&
git check-ignore a/git a/git/foo a/git-foo a/git-foo/bar >actual &&
cat >expect <<-\EOF &&
a/git
a/git/foo
EOF
test_cmp expect actual
'
############################################################################
#
# test whitespace handling