When a patch wants to create a path, but we already have it in our
current state, pretend as if the patch and we independently added
the same path and cause add/add conflict, so that the user can
resolve it just like "git merge" in the same situation.
For that purpose, implement load_current() in terms of the
load_patch_target() helper introduced earlier to read the current
contents from the path given by patch->new_name (patch->old_name is
NULL for a creation patch).
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
builtin/apply.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 62 insertions(+), 8 deletions(-)
diff --git a/builtin/apply.c b/builtin/apply.c
index 682852c..24efb3f 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -197,6 +197,7 @@ struct patch {
unsigned int is_rename:1;
unsigned int recount:1;
unsigned int conflicted_threeway:1;
+ unsigned int direct_to_threeway:1;
struct fragment *fragments;
char *result;
size_t resultsize;
@@ -3187,6 +3188,48 @@ static int three_way_merge(struct image *image,
return status;
}
+/*
+ * When directly falling back to add/add three-way merge, we read from
+ * the current contents of the new_name. In no cases other than that
+ * this function will be called.
+ */
+static int load_current(struct image *image, struct patch *patch)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int status, pos;
+ size_t len;
+ char *img;
+ struct stat st;
+ struct cache_entry *ce;
+ char *name = patch->new_name;
+ unsigned mode = patch->new_mode;
+
+ if (!patch->is_new)
+ die("BUG: patch to %s is not a creation", patch->old_name);
+
+ pos = cache_name_pos(name, strlen(name));
+ if (pos < 0)
+ return error(_("%s: does not exist in index"), name);
+ ce = active_cache[pos];
+ if (lstat(name, &st)) {
+ if (errno != ENOENT)
+ return error(_("%s: %s"), name, strerror(errno));
+ if (checkout_target(ce, &st))
+ return -1;
+ }
+ if (verify_index_match(ce, &st))
+ return error(_("%s: does not match index"), name);
+
+ status = load_patch_target(&buf, ce, &st, name, mode);
+ if (status < 0)
+ return status;
+ else if (status)
+ return -1;
+ img = strbuf_detach(&buf, &len);
+ prepare_image(image, img, len, !patch->is_binary);
+ return 0;
+}
+
static int try_threeway(struct image *image, struct patch *patch,
struct stat *st, struct cache_entry *ce)
{
@@ -3198,13 +3241,15 @@ static int try_threeway(struct image *image, struct patch *patch,
struct image tmp_image;
/* No point falling back to 3-way merge in these cases */
- if (patch->is_new || patch->is_delete ||
+ if (patch->is_delete ||
S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
return -1;
/* Preimage the patch was prepared for */
- if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
- read_blob_object(&buf, pre_sha1, patch->old_mode))
+ if (patch->is_new)
+ write_sha1_file("", 0, blob_type, pre_sha1);
+ else if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
+ read_blob_object(&buf, pre_sha1, patch->old_mode))
return error("repository lacks the necessary blob to fall back on 3-way merge.");
fprintf(stderr, "Falling back to three-way merge...\n");
@@ -3221,9 +3266,15 @@ static int try_threeway(struct image *image, struct patch *patch,
clear_image(&tmp_image);
/* our_sha1[] is ours */
- if (load_preimage(&tmp_image, patch, st, ce))
- return error("cannot read the current contents of '%s'",
- patch->old_name);
+ if (patch->is_new) {
+ if (load_current(&tmp_image, patch))
+ return error("cannot read the current contents of '%s'",
+ patch->new_name);
+ } else {
+ if (load_preimage(&tmp_image, patch, st, ce))
+ return error("cannot read the current contents of '%s'",
+ patch->old_name);
+ }
write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
clear_image(&tmp_image);
@@ -3254,7 +3305,8 @@ static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *
if (load_preimage(&image, patch, st, ce) < 0)
return -1;
- if (apply_fragments(&image, patch) < 0) {
+ if (patch->direct_to_threeway ||
+ apply_fragments(&image, patch) < 0) {
/* Note: with --reject, apply_fragments() returns 0 */
if (!threeway || try_threeway(&image, patch, st, ce) < 0)
return -1;
@@ -3431,7 +3483,9 @@ static int check_patch(struct patch *patch)
((0 < patch->is_new) | (0 < patch->is_rename) | patch->is_copy)) {
int err = check_to_create(new_name, ok_if_exists);
- switch (err) {
+ if (err && threeway) {
+ patch->direct_to_threeway = 1;
+ } else switch (err) {
case 0:
break; /* happy */
case EXISTS_IN_INDEX:
--
1.7.11.1.294.g68a9409
--
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