Function unpack_sparse_callback

unpack-trees.c:1460–1494

}

static int unpack_sparse_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info)
{
	struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
	struct unpack_trees_options *o = info->data;
	int ret, is_new_sparse_dir;

	assert(o->merge);

	/*
	 * Unlike in 'unpack_callback', where src[0] is derived from the index when
	 * merging, src[0] is a transient cache entry derived from the first tree
	 * provided. Create the temporary entry as if it came from a non-sparse index.
	 */
	if (!is_null_oid(&names[0].oid)) {
		src[0] = create_ce_entry(info, &names[0], 0,
					&o->internal.result, 1,
					dirmask & (1ul << 0));
		src[0]->ce_flags |= (CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE);
	}

	/*
	 * 'unpack_single_entry' assumes that src[0] is derived directly from
	 * the index, rather than from an entry in 'names'. This is *not* true when
	 * merging a sparse directory, in which case names[0] is the "index" source
	 * entry. To match the expectations of 'unpack_single_entry', shift past the
	 * "index" tree (i.e., names[0]) and adjust 'names', 'n', 'mask', and
	 * 'dirmask' accordingly.
	 */
	ret = unpack_single_entry(n - 1, mask >> 1, dirmask >> 1, src, names + 1, info, &is_new_sparse_dir);

	if (src[0])
		discard_cache_entry(src[0]);

	return ret >= 0 ? mask : -1;
}

/*
 * Note that traverse_by_cache_tree() duplicates some logic in this function