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checkout.c: unstage empty deleted ita files

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It is possible to delete a committed file from the index and then add it
as intent-to-add. After `git checkout HEAD <pathspec>`, the file should
be identical in the index and HEAD. The command already works correctly
if the file has contents in HEAD. This patch provides the desired
behavior even when the file is empty in HEAD.

`git checkout HEAD <pathspec>` calls tree.c:read_tree_1(), with fn
pointing to checkout.c:update_some(). update_some() creates a new cache
entry but discards it when its mode and oid match those of the old
entry. A cache entry for an ita file and a cache entry for an empty file
have the same oid. Therefore, an empty deleted ita file previously
passed both of these checks, and the new entry was discarded, so the
file remained unchanged in the index. After this fix, if the file is
marked as ita in the cache, then we avoid discarding the new entry and
add the new entry to the cache instead.

This change should not affect newly added ita files. For those, inside
tree.c:read_tree_1(), tree_entry_interesting() returns
entry_not_interesting, so fn is never called.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Varun Naik <vcnaik94@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Varun Naik 2019-08-02 09:28:52 -07:00 committed by Junio C Hamano
parent 51cf315870
commit ecd72042de
2 changed files with 12 additions and 0 deletions
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1
builtin/checkout.c
View file

@ -126,6 +126,7 @@ static int update_some(const struct object_id *oid, struct strbuf *base,
if (pos >= 0) {
struct cache_entry *old = active_cache[pos];
if (ce->ce_mode == old->ce_mode &&
!ce_intent_to_add(old) &&
oideq(&ce->oid, &old->oid)) {
old->ce_flags |= CE_UPDATE;
discard_cache_entry(ce);

11
t/t2022-checkout-paths.sh
View file

@ -78,4 +78,15 @@ test_expect_success 'do not touch files that are already up-to-date' '
test_cmp expect actual
'
test_expect_success 'checkout HEAD adds deleted intent-to-add file back to index' '
echo "nonempty" >nonempty &&
>empty &&
git add nonempty empty &&
git commit -m "create files to be deleted" &&
git rm --cached nonempty empty &&
git add -N nonempty empty &&
git checkout HEAD nonempty empty &&
git diff --cached --exit-code
'
test_done