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authorJunio C Hamano <gitster@pobox.com>2012-06-08 09:54:10 -0700
committerJunio C Hamano <gitster@pobox.com>2012-07-09 14:39:21 -0700
commit519d1a5b4e044459bd7323cfa6a7cb98cec5c884 (patch)
treefb5639fd9ea9cf083b852710ddede20dfea3a2d1
parentcfb6f9acc392561bb339763564e21b684e50ce83 (diff)
downloadgit-519d1a5b4e044459bd7323cfa6a7cb98cec5c884.tar.gz
git-519d1a5b4e044459bd7323cfa6a7cb98cec5c884.tar.xz
apply: fall back on three-way merge
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@pobox.com>
-rw-r--r--builtin/apply.c46
1 files changed, 45 insertions, 1 deletions
diff --git a/builtin/apply.c b/builtin/apply.c
index 51b695bac..5a7201fc8 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -3140,10 +3140,54 @@ static int load_preimage(struct image *image,
return 0;
}
+static int three_way_merge(struct image *image,
+ char *path,
+ const unsigned char *base,
+ const unsigned char *ours,
+ const unsigned char *theirs)
+{
+ return -1; /* for now */
+}
+
static int try_threeway(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;
+ }
+ /* post_sha1[] is theirs */
+ write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
+ 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);
+ write_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)