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tree-walk.c: don't match submodule entries for 'submod/anything' 

Submodules should be handled the same as regular directories with
respect to the presence of a trailing slash, i.e. commands like:

  git diff rev1 rev2 -- $path
  git rev-list HEAD -- $path

should produce the same output whether $path is 'submod' or 'submod/'.
This has been fixed in commit 74b4f7f277 (tree-walk.c: ignore trailing
slash on submodule in tree_entry_interesting(), 2014-01-23).

Unfortunately, that commit had the unintended side effect to handle
'submod/anything' the same as 'submod' and 'submod/' as well, e.g.:

  $ git log --oneline --name-only -- sha1collisiondetection/whatever
  4125f78222 sha1dc: update from upstream
  sha1collisiondetection
  07a20f569b Makefile: fix unaligned loads in sha1dc with UBSan
  sha1collisiondetection
  23e37f8e9d sha1dc: update from upstream
  sha1collisiondetection
  86cfd61e6b sha1dc: optionally use sha1collisiondetection as a submodule
  sha1collisiondetection

Fix this by rejecting submodules as partial pathnames when their
trailing slash is followed by anything.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
SZEDER Gábor 2020-06-05 13:00:23 +00:00 committed by Junio C Hamano
parent f32dde8c12
commit 35a9f1e99c
2 changed files with 11 additions and 2 deletions
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4
t/t4010-diff-pathspec.sh
View File

@ -125,7 +125,9 @@ test_expect_success 'setup submodules' '
test_expect_success 'diff-tree ignores trailing slash on submodule path' '
git diff --name-only HEAD^ HEAD submod >expect &&
git diff --name-only HEAD^ HEAD submod/ >actual &&
test_cmp expect actual
test_cmp expect actual &&
git diff --name-only HEAD^ HEAD -- submod/whatever >actual &&
test_must_be_empty actual
'
test_expect_success 'diff multiple wildcard pathspecs' '

9
tree-walk.c
View File

@ -851,7 +851,14 @@ static int match_entry(const struct pathspec_item *item,
if (matchlen > pathlen) {
if (match[pathlen] != '/')
return 0;
if (!S_ISDIR(entry->mode) && !S_ISGITLINK(entry->mode))
/*
* Reject non-directories as partial pathnames, except
* when match is a submodule with a trailing slash and
* nothing else (to handle 'submod/' and 'submod'
* uniformly).
*/
if (!S_ISDIR(entry->mode) &&
(!S_ISGITLINK(entry->mode) || matchlen > pathlen + 1))
return 0;
}