Function refresh_fsmonitor

fsmonitor.c:506–726

static int fsmonitor_force_update_threshold = 100;

void refresh_fsmonitor(struct index_state *istate)
{
	static int warn_once = 0;
	struct strbuf query_result = STRBUF_INIT;
	int query_success = 0, hook_version = -1;
	size_t bol = 0; /* beginning of line */
	uint64_t last_update;
	struct strbuf last_update_token = STRBUF_INIT;
	char *buf;
	unsigned int i;
	int is_trivial = 0;
	struct repository *r = istate->repo;
	enum fsmonitor_mode fsm_mode = fsm_settings__get_mode(r);
	enum fsmonitor_reason reason = fsm_settings__get_reason(r);

	if (!warn_once && reason > FSMONITOR_REASON_OK) {
		char *msg = fsm_settings__get_incompatible_msg(r, reason);
		warn_once = 1;
		warning("%s", msg);
		free(msg);
	}

	if (fsm_mode <= FSMONITOR_MODE_DISABLED ||
	    istate->fsmonitor_has_run_once)
		return;

	istate->fsmonitor_has_run_once = 1;

	trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");

	if (fsm_mode == FSMONITOR_MODE_IPC) {
		query_success = !fsmonitor_ipc__send_query(
			istate->fsmonitor_last_update ?
			istate->fsmonitor_last_update : "builtin:fake",
			&query_result);
		if (query_success) {
			/*
			 * The response contains a series of nul terminated
			 * strings.  The first is the new token.
			 *
			 * Use `char *buf` as an interlude to trick the CI
			 * static analysis to let us use `strbuf_addstr()`
			 * here (and only copy the token) rather than
			 * `strbuf_addbuf()`.
			 */
			buf = query_result.buf;
			strbuf_addstr(&last_update_token, buf);
			bol = last_update_token.len + 1;
			is_trivial = query_result.buf[bol] == '/';
			if (is_trivial)
				trace2_data_intmax("fsm_client", NULL,
						   "query/trivial-response", 1);
		} else {
			/*
			 * The builtin daemon is not available on this
			 * platform -OR- we failed to get a response.
			 *
			 * Generate a fake token (rather than a V1