Function do_merge

sequencer.c:4102–4412

}

static int do_merge(struct repository *r,
		    struct commit *commit,
		    const char *arg, int arg_len,
		    int flags, int *check_todo, struct replay_opts *opts)
{
	struct replay_ctx *ctx = opts->ctx;
	int run_commit_flags = 0;
	struct strbuf ref_name = STRBUF_INIT;
	struct commit *head_commit, *merge_commit, *i;
	struct commit_list *bases = NULL, *j;
	struct commit_list *to_merge = NULL, **tail = &to_merge;
	const char *strategy = !opts->xopts.nr &&
		(!opts->strategy ||
		 !strcmp(opts->strategy, "recursive") ||
		 !strcmp(opts->strategy, "ort")) ?
		NULL : opts->strategy;
	struct merge_options o;
	int merge_arg_len, oneline_offset, can_fast_forward, ret, k;
	static struct lock_file lock;
	const char *p;
	const char *reflog_action = reflog_message(opts, "merge", NULL);

	if (repo_hold_locked_index(r, &lock, LOCK_REPORT_ON_ERROR) < 0) {
		ret = -1;
		goto leave_merge;
	}

	head_commit = lookup_commit_reference_by_name("HEAD");
	if (!head_commit) {
		ret = error(_("cannot merge without a current revision"));
		goto leave_merge;
	}

	/*
	 * For octopus merges, the arg starts with the list of revisions to be
	 * merged. The list is optionally followed by '#' and the oneline.
	 */
	merge_arg_len = oneline_offset = arg_len;
	for (p = arg; p - arg < arg_len; p += strspn(p, " \t\n")) {
		if (!*p)
			break;
		if (*p == '#' && (!p[1] || isspace(p[1]))) {
			p += 1 + strspn(p + 1, " \t\n");
			oneline_offset = p - arg;
			break;
		}
		k = strcspn(p, " \t\n");
		if (!k)
			continue;
		merge_commit = lookup_label(r, p, k, &ref_name);
		if (!merge_commit) {
			ret = error(_("unable to parse '%.*s'"), k, p);
			goto leave_merge;
		}
		tail = &commit_list_insert(merge_commit, tail)->next;
		p += k;
		merge_arg_len = p - arg;
	}