Function merge_commit

builtin/notes.c:817–871

}

static int merge_commit(struct notes_merge_options *o)
{
	struct strbuf msg = STRBUF_INIT;
	struct object_id oid, parent_oid;
	struct notes_tree t = {0};
	struct commit *partial;
	struct pretty_print_context pretty_ctx;
	void *local_ref_to_free;
	int ret;

	/*
	 * Read partial merge result from .git/NOTES_MERGE_PARTIAL,
	 * and target notes ref from .git/NOTES_MERGE_REF.
	 */

	if (repo_get_oid(the_repository, "NOTES_MERGE_PARTIAL", &oid))
		die(_("failed to read ref NOTES_MERGE_PARTIAL"));
	else if (!(partial = lookup_commit_reference(the_repository, &oid)))
		die(_("could not find commit from NOTES_MERGE_PARTIAL."));
	else if (repo_parse_commit(the_repository, partial))
		die(_("could not parse commit from NOTES_MERGE_PARTIAL."));

	if (partial->parents)
		oidcpy(&parent_oid, &partial->parents->item->object.oid);
	else
		oidclr(&parent_oid, the_repository->hash_algo);

	init_notes(&t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);

	o->local_ref = local_ref_to_free =
		refs_resolve_refdup(get_main_ref_store(the_repository),
				    "NOTES_MERGE_REF", 0, &oid, NULL);
	if (!o->local_ref)
		die(_("failed to resolve NOTES_MERGE_REF"));

	if (notes_merge_commit(o, &t, partial, &oid))
		die(_("failed to finalize notes merge"));

	/* Reuse existing commit message in reflog message */
	memset(&pretty_ctx, 0, sizeof(pretty_ctx));
	repo_format_commit_message(the_repository, partial, "%s", &msg,
				   &pretty_ctx);
	strbuf_trim(&msg);
	strbuf_insertstr(&msg, 0, "notes: ");
	refs_update_ref(get_main_ref_store(the_repository), msg.buf,
			o->local_ref, &oid,
			is_null_oid(&parent_oid) ? NULL : &parent_oid,
			0, UPDATE_REFS_DIE_ON_ERR);

	free_notes(&t);
	strbuf_release(&msg);
	ret = merge_abort(o);
	free(local_ref_to_free);
	return ret;
}

static int git_config_get_notes_strategy(const char *key,
					 enum notes_merge_strategy *strategy)