Function get_ref_map

builtin/fetch.c:485–639

}

static struct ref *get_ref_map(struct remote *remote,
			       const struct ref *remote_refs,
			       struct refspec *rs,
			       int tags, int *autotags)
{
	int i;
	struct ref *rm;
	struct ref *ref_map = NULL;
	struct ref **tail = &ref_map;

	/* opportunistically-updated references: */
	struct ref *orefs = NULL, **oref_tail = &orefs;

	struct hashmap existing_refs;
	int existing_refs_populated = 0;

	filter_prefetch_refspec(rs);
	if (remote)
		filter_prefetch_refspec(&remote->fetch);

	if (rs->nr) {
		struct refspec *fetch_refspec;

		for (i = 0; i < rs->nr; i++) {
			get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
			if (rs->items[i].dst && rs->items[i].dst[0])
				*autotags = 1;
		}
		/* Merge everything on the command line (but not --tags) */
		for (rm = ref_map; rm; rm = rm->next)
			rm->fetch_head_status = FETCH_HEAD_MERGE;

		/*
		 * For any refs that we happen to be fetching via
		 * command-line arguments, the destination ref might
		 * have been missing or have been different than the
		 * remote-tracking ref that would be derived from the
		 * configured refspec.  In these cases, we want to
		 * take the opportunity to update their configured
		 * remote-tracking reference.  However, we do not want
		 * to mention these entries in FETCH_HEAD at all, as
		 * they would simply be duplicates of existing
		 * entries, so we set them FETCH_HEAD_IGNORE below.
		 *
		 * We compute these entries now, based only on the
		 * refspecs specified on the command line.  But we add
		 * them to the list following the refspecs resulting
		 * from the tags option so that one of the latter,
		 * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
		 * by ref_remove_duplicates() in favor of one of these
		 * opportunistic entries with FETCH_HEAD_IGNORE.
		 */
		if (refmap.nr)
			fetch_refspec = &refmap;
		else
			fetch_refspec = &remote->fetch;

		for (i = 0; i < fetch_refspec->nr; i++)