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cache-tree: do not generate empty trees as a result of all i-t-a subentries

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If a subdirectory contains nothing but i-t-a entries, we generate an
empty tree object and add it to its parent tree. Which is wrong. Such
a subdirectory should not be added.

Note that this has a cascading effect. If subdir 'a/b/c' contains
nothing but i-t-a entries, we ignore it. But then if 'a/b' contains
only (the non-existing) 'a/b/c', then we should ignore 'a/b' while
building 'a' too. And it goes all the way up to top directory.

Noticed-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2016-07-16 07:06:27 +02:00 committed by Junio C Hamano
parent c041d54a74
commit 6d6a782fbf
2 changed files with 23 additions and 1 deletions
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10
cache-tree.c
View File

@ -325,6 +325,7 @@ static int update_one(struct cache_tree *it,
const unsigned char *sha1;
unsigned mode;
int expected_missing = 0;
int contains_ita = 0;
path = ce->name;
pathlen = ce_namelen(ce);
@ -341,7 +342,8 @@ static int update_one(struct cache_tree *it,
i += sub->count;
sha1 = sub->cache_tree->sha1;
mode = S_IFDIR;
if (sub->cache_tree->entry_count < 0) {
contains_ita = sub->cache_tree->entry_count < 0;
if (contains_ita) {
to_invalidate = 1;
expected_missing = 1;
}
@ -380,6 +382,12 @@ static int update_one(struct cache_tree *it,
continue;
}
/*
* "sub" can be an empty tree if all subentries are i-t-a.
*/
if (contains_ita && !hashcmp(sha1, EMPTY_TREE_SHA1_BIN))
continue;
strbuf_grow(&buffer, entlen + 100);
strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0');
strbuf_add(&buffer, sha1, 20);

14
t/t2203-add-intent.sh
View File

@ -99,5 +99,19 @@ test_expect_success 'cache-tree does not ignore dir that has i-t-a entries' '
)
'
test_expect_success 'cache-tree does skip dir that becomes empty' '
rm -fr ita-in-dir &&
git init ita-in-dir &&
(
cd ita-in-dir &&
mkdir -p 1/2/3 &&
echo 4 >1/2/3/4 &&
git add -N 1/2/3/4 &&
git write-tree >actual &&
echo $EMPTY_TREE >expected &&
test_cmp expected actual
)
'
test_done