apply: allow "new file" patches on i-t-a entries

diff-files recently changed to treat changes to paths marked "intent to
add" in the index as new file diffs rather than diffs from the empty
blob.  However, apply refuses to apply new file diffs on top of existing
index entries, except in the case of renames. This causes "git add -p",
which uses apply, to fail when attempting to stage hunks from a file
when intent to add has been recorded.

This changes the logic in check_to_create() which checks if an entry
already exists in an index in two ways: first, we only search for an
index entry at all if ok_if_exists is false; second, we check for the
CE_INTENT_TO_ADD flag on any index entries we find and allow the apply
to proceed if it is set.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Raymond E. Pasco <ray@ameretat.dev>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/apply.c b/apply.c
index 8bff604dbe..4cba4ce71a 100644
--- a/apply.c
+++ b/apply.c
@@ -3747,10 +3747,13 @@ static int check_to_create(struct apply_state *state,
 {
 	struct stat nst;
 
-	if (state->check_index &&
-	    index_name_pos(state->repo->index, new_name, strlen(new_name)) >= 0 &&
-	    !ok_if_exists)
-		return EXISTS_IN_INDEX;
+	if (state->check_index && !ok_if_exists) {
+		int pos = index_name_pos(state->repo->index, new_name, strlen(new_name));
+		if (pos >= 0 &&
+		    !(state->repo->index->cache[pos]->ce_flags & CE_INTENT_TO_ADD))
+			return EXISTS_IN_INDEX;
+	}
+
 	if (state->cached)
 		return 0;