fsmonitor--daemon: print start message only if fsmonitor.announceStartup

Teach fsmonitor--daemon to print a startup message only when
`fsmonitor.announceStartup` is true.  This setting is false by default
so that the output of client commands, like `git status`, is not
changed if the daemon is implicitly started.

The message is conditionally printed by "run" and "start" subcommands
and is sent to stderr.  It contains the path to the work tree root.

Signed-off-by: Jeff Hostetler <[email protected]>

Author: jeffhostetler

builtin/fsmonitor--daemon.c

@@ -27,6 +27,9 @@ static int fsmonitor__ipc_threads = 8;
 #define FSMONITOR__START_TIMEOUT "fsmonitor.starttimeout"
 static int fsmonitor__start_timeout_sec = 60;
 
+#define FSMONITOR__ANNOUNCE_STARTUP "fsmonitor.announcestartup"
+static int fsmonitor__announce_startup = 0;
+
 static int fsmonitor_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, FSMONITOR__IPC_THREADS)) {
@@ -47,6 +50,16 @@ static int fsmonitor_config(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
+	if (!strcmp(var, FSMONITOR__ANNOUNCE_STARTUP)) {
+		int is_bool;
+		int i = git_config_bool_or_int(var, value, &is_bool);
+		if (i < 0)
+			return error(_("value of '%s' not bool or int: %d"),
+				     var, i);
+		fsmonitor__announce_startup = i;
+		return 0;
+	}
+
 	return git_default_config(var, value, cb);
 }
 
@@ -1307,9 +1320,11 @@ static int try_to_run_foreground_daemon(int free_console)
 		die("fsmonitor--daemon is already running '%s'",
 		    the_repository->worktree);
 
-	printf(_("running fsmonitor-daemon in '%s'\n"),
-	       the_repository->worktree);
-	fflush(stdout);
+	if (fsmonitor__announce_startup) {
+		fprintf(stderr, _("running fsmonitor-daemon in '%s'\n"),
+			the_repository->worktree);
+		fflush(stderr);
+	}
 
 #ifdef GIT_WINDOWS_NATIVE
 	if (free_console)
@@ -1360,9 +1375,11 @@ static int try_to_start_background_daemon(void)
 		die("fsmonitor--daemon is already running '%s'",
 		    the_repository->worktree);
 
-	printf(_("starting fsmonitor-daemon in '%s'\n"),
-	       the_repository->worktree);
-	fflush(stdout);
+	if (fsmonitor__announce_startup) {
+		fprintf(stderr, _("starting fsmonitor-daemon in '%s'\n"),
+			the_repository->worktree);
+		fflush(stderr);
+	}
 
 	cp.git_cmd = 1;