fsmonitor--daemon: implement 'stop' and 'status' commands

Implement `stop` and `status` client commands to control and query the
status of a `fsmonitor--daemon` server process (and implicitly start a
server process if necessary).

Later commits will implement the actual server and monitor the file
system.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fsmonitor--daemon.c

@@ -7,10 +7,55 @@
 #include "khash.h"
 
 static const char * const builtin_fsmonitor__daemon_usage[] = {
+	N_("git fsmonitor--daemon stop"),
+	N_("git fsmonitor--daemon status"),
 	NULL
 };
 
 #ifdef HAVE_FSMONITOR_DAEMON_BACKEND
+/*
+ * Acting as a CLIENT.
+ *
+ * Send a "quit" command to the `git-fsmonitor--daemon` (if running)
+ * and wait for it to shutdown.
+ */
+static int do_as_client__send_stop(void)
+{
+	struct strbuf answer = STRBUF_INIT;
+	int ret;
+
+	ret = fsmonitor_ipc__send_command("quit", &answer);
+
+	/* The quit command does not return any response data. */
+	strbuf_release(&answer);
+
+	if (ret)
+		return ret;
+
+	trace2_region_enter("fsm_client", "polling-for-daemon-exit", NULL);
+	while (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
+		sleep_millisec(50);
+	trace2_region_leave("fsm_client", "polling-for-daemon-exit", NULL);
+
+	return 0;
+}
+
+static int do_as_client__status(void)
+{
+	enum ipc_active_state state = fsmonitor_ipc__get_state();
+
+	switch (state) {
+	case IPC_STATE__LISTENING:
+		printf(_("fsmonitor-daemon is watching '%s'\n"),
+		       the_repository->worktree);
+		return 0;
+
+	default:
+		printf(_("fsmonitor-daemon is not watching '%s'\n"),
+		       the_repository->worktree);
+		return 1;
+	}
+}
 
 int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
 {
@@ -28,6 +73,12 @@ int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
 		usage_with_options(builtin_fsmonitor__daemon_usage, options);
 	subcmd = argv[0];
 
+	if (!strcmp(subcmd, "stop"))
+		return !!do_as_client__send_stop();
+
+	if (!strcmp(subcmd, "status"))
+		return !!do_as_client__status();
+
 	die(_("Unhandled subcommand '%s'"), subcmd);
 }