1 files changed, 134 insertions, 0 deletions
diff --git a/merge-ort-wrappers.c b/merge-ort-wrappers.c
new file mode 100644
index 0000000000..c54d56b344
--- /dev/null
+++ b/merge-ort-wrappers.c
@@ -0,0 +1,134 @@
+#include "git-compat-util.h"
+#include "gettext.h"
+#include "hash.h"
+#include "hex.h"
+#include "lockfile.h"
+#include "merge-ort.h"
+#include "merge-ort-wrappers.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "tag.h"
+#include "tree.h"
+
+#include "commit.h"
+
+static int unclean(struct merge_options *opt, struct tree *head)
+{
+	/* Sanity check on repo state; index must match head */
+	struct strbuf sb = STRBUF_INIT;
+
+	if (head && repo_index_has_changes(opt->repo, head, &sb)) {
+		error(_("Your local changes to the following files would be overwritten by merge:\n  %s"),
+		      sb.buf);
+		strbuf_release(&sb);
+		return -1;
+	}
+
+	return 0;
+}
+
+int merge_ort_nonrecursive(struct merge_options *opt,
+			   struct tree *head,
+			   struct tree *merge,
+			   struct tree *merge_base)
+{
+	struct merge_result result;
+	int show_msgs;
+
+	if (unclean(opt, head))
+		return -1;
+
+	if (oideq(&merge_base->object.oid, &merge->object.oid)) {
+		printf_ln(_("Already up to date."));
+		return 1;
+	}
+
+	show_msgs = !!opt->verbosity;
+	memset(&result, 0, sizeof(result));
+	merge_incore_nonrecursive(opt, merge_base, head, merge, &result);
+	merge_switch_to_result(opt, head, &result, 1, show_msgs);
+
+	return result.clean;
+}
+
+int merge_ort_recursive(struct merge_options *opt,
+			struct commit *side1,
+			struct commit *side2,
+			const struct commit_list *merge_bases,
+			struct commit **result)
+{
+	struct tree *head = repo_get_commit_tree(opt->repo, side1);
+	struct merge_result tmp;
+	int show_msgs;
+
+	if (unclean(opt, head))
+		return -1;
+
+	show_msgs = !!opt->verbosity;
+	memset(&tmp, 0, sizeof(tmp));
+	merge_incore_recursive(opt, merge_bases, side1, side2, &tmp);
+	merge_switch_to_result(opt, head, &tmp, 1, show_msgs);
+	*result = NULL;
+
+	return tmp.clean;
+}
+
+static struct commit *get_ref(struct repository *repo,
+			      const struct object_id *oid,
+			      const char *name)
+{
+	struct object *object;
+
+	object = deref_tag(repo, parse_object(repo, oid),
+			   name, strlen(name));
+	if (!object)
+		return NULL;
+	if (object->type == OBJ_TREE)
+		return make_virtual_commit(repo, (struct tree*)object, name);
+	if (object->type != OBJ_COMMIT)
+		return NULL;
+	if (repo_parse_commit(repo, (struct commit *)object))
+		return NULL;
+	return (struct commit *)object;
+}
+
+int merge_ort_generic(struct merge_options *opt,
+		      const struct object_id *head,
+		      const struct object_id *merge,
+		      int num_merge_bases,
+		      const struct object_id *merge_bases,
+		      struct commit **result)
+{
+	int clean;
+	struct lock_file lock = LOCK_INIT;
+	struct commit *head_commit = get_ref(opt->repo, head, opt->branch1);
+	struct commit *next_commit = get_ref(opt->repo, merge, opt->branch2);
+	struct commit_list *ca = NULL;
+
+	if (merge_bases) {
+		int i;
+		for (i = 0; i < num_merge_bases; ++i) {
+			struct commit *base;
+			if (!(base = get_ref(opt->repo, &merge_bases[i],
+					     oid_to_hex(&merge_bases[i]))))
+				return error(_("Could not parse object '%s'"),
+					     oid_to_hex(&merge_bases[i]));
+			commit_list_insert(base, &ca);
+		}
+	}
+
+	repo_hold_locked_index(opt->repo, &lock, LOCK_DIE_ON_ERROR);
+	clean = merge_ort_recursive(opt, head_commit, next_commit, ca,
+				    result);
+	free_commit_list(ca);
+	if (clean < 0) {
+		rollback_lock_file(&lock);
+		return clean;
+	}
+
+	if (write_locked_index(opt->repo->index, &lock,
+			       COMMIT_LOCK | SKIP_IF_UNCHANGED))
+		return error(_("Unable to write index."));
+
+	return clean ? 0 : 1;
+}