Function refresh_index

read-cache.c:1482–1614

int refresh_index(struct index_state *istate, unsigned int flags,
		  const struct pathspec *pathspec,
		  char *seen, const char *header_msg)
{
	int i;
	int has_errors = 0;
	int really = (flags & REFRESH_REALLY) != 0;
	int allow_unmerged = (flags & REFRESH_UNMERGED) != 0;
	int quiet = (flags & REFRESH_QUIET) != 0;
	int not_new = (flags & REFRESH_IGNORE_MISSING) != 0;
	int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0;
	int ignore_skip_worktree = (flags & REFRESH_IGNORE_SKIP_WORKTREE) != 0;
	int first = 1;
	int in_porcelain = (flags & REFRESH_IN_PORCELAIN);
	unsigned int options = (CE_MATCH_REFRESH |
				(really ? CE_MATCH_IGNORE_VALID : 0) |
				(not_new ? CE_MATCH_IGNORE_MISSING : 0));
	const char *modified_fmt;
	const char *deleted_fmt;
	const char *typechange_fmt;
	const char *added_fmt;
	const char *unmerged_fmt;
	struct progress *progress = NULL;
	int t2_sum_lstat = 0;
	int t2_sum_scan = 0;

	if (flags & REFRESH_PROGRESS && isatty(2))
		progress = start_delayed_progress(the_repository,
						  _("Refresh index"),
						  istate->cache_nr);

	trace_performance_enter();
	modified_fmt   = in_porcelain ? "M\t%s\n" : "%s: needs update\n";
	deleted_fmt    = in_porcelain ? "D\t%s\n" : "%s: needs update\n";
	typechange_fmt = in_porcelain ? "T\t%s\n" : "%s: needs update\n";
	added_fmt      = in_porcelain ? "A\t%s\n" : "%s: needs update\n";
	unmerged_fmt   = in_porcelain ? "U\t%s\n" : "%s: needs merge\n";
	/*
	 * Use the multi-threaded preload_index() to refresh most of the
	 * cache entries quickly then in the single threaded loop below,
	 * we only have to do the special cases that are left.
	 */
	preload_index(istate, pathspec, 0);
	trace2_region_enter("index", "refresh", NULL);

	for (i = 0; i < istate->cache_nr; i++) {
		struct cache_entry *ce, *new_entry;
		int cache_errno = 0;
		int changed = 0;
		int filtered = 0;
		int t2_did_lstat = 0;
		int t2_did_scan = 0;

		ce = istate->cache[i];
		if (ignore_submodules && S_ISGITLINK(ce->ce_mode))
			continue;
		if (ignore_skip_worktree && ce_skip_worktree(ce))
			continue;