Grab the preimage blob the patch claims to be based on out of the object
store, apply the patch, and then call three-way-merge function. This step
still does not plug the actual three-way merge logic yet, but we are
getting there.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
builtin/apply.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/builtin/apply.c b/builtin/apply.c
index fcd5bdf..1fe178f 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -3073,10 +3073,51 @@ static int load_preimage(struct image *image,
return 0;
}
+static int three_way_merge(struct image *image,
+ char *path,
+ unsigned char *base,
+ unsigned char *ours,
+ unsigned char *theirs)
+{
+ return -1; /* for now */
+}
+
static int try_threeway_fallback(struct image *image, struct patch *patch,
struct stat *st, struct cache_entry *ce)
{
- return -1; /* for now */
+ unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
+ struct strbuf buf = STRBUF_INIT;
+ size_t len;
+ char *img;
+ struct image tmp_image;
+
+ /* No point falling back to 3-way merge in these cases */
+ if (patch->is_new || 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))
+ return error("repository lacks the necessary blob to fall back on 3-way merge.");
+ img = strbuf_detach(&buf, &len);
+ prepare_image(&tmp_image, img, len, 1);
+ /* Apply the patch to get the post image */
+ if (apply_fragments(&tmp_image, patch) < 0) {
+ clear_image(&tmp_image);
+ return -1;
+ }
+ hash_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
+ clear_image(&tmp_image);
+
+ /* pre_sha1[] is common, post_sha1[] is theirs */
+ load_preimage(&tmp_image, patch, st, ce);
+ hash_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
+ clear_image(&tmp_image);
+
+ /* in-core three-way merge between post and our using pre as base */
+ return three_way_merge(image,
+ patch->new_name, pre_sha1, our_sha1, post_sha1);
}
static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce)
--
1.7.10.1.574.g840b38f
--
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