[PATCH v2 15/17] index-helper: autorun mode

@@ -368,8 +368,9 @@ done:
 int main(int argc, char **argv)
 {
 	const char *prefix;
-	int idle_in_seconds = 600, detach = 0, kill = 0;
+	int idle_in_seconds = 600, detach = 0, kill = 0, autorun = 0;
 	int fd;
+	int nongit;
 	struct strbuf pipe_path = STRBUF_INIT;
 	struct option options[] = {
 		OPT_INTEGER(0, "exit-after", &idle_in_seconds,

@@ -378,6 +379,7 @@ int main(int argc, char **argv)
 			 "verify shared memory after creating"),
 		OPT_BOOL(0, "detach", &detach, "detach the process"),
 		OPT_BOOL(0, "kill", &kill, "request that existing index helper processes exit"),
+		OPT_BOOL(0, "autorun", &autorun, "this is an automatic run of git index-helper, so certain errors can be solved by silently exiting"),
 		OPT_END()
 	};
 

@@ -387,7 +389,14 @@ int main(int argc, char **argv)
 	if (argc == 2 && !strcmp(argv[1], "-h"))
 		usage_with_options(usage_text, options);
 
-	prefix = setup_git_directory();
+	prefix = setup_git_directory_gently(&nongit);
+	if (nongit) {
+		if (autorun)
+			exit(0);
+		else
+			die("Not a git repository");
+	}
+
 	if (parse_options(argc, (const char **)argv, prefix,
 			  options, usage_text, 0))
 		die(_("too many arguments"));

@@ -402,10 +411,18 @@ int main(int argc, char **argv)
 
 	/* check that no other copy is running */
 	fd = open(pipe_path.buf, O_RDONLY | O_NONBLOCK);
-	if (fd > 0)
-		die(_("Already running"));
-	if (errno != ENXIO && errno != ENOENT)
-		die_errno(_("Unexpected error checking pipe"));
+	if (fd > 0) {
+		if (autorun)
+			return 0;
+		else
+			die(_("Already running"));
+	}
+	if (errno != ENXIO && errno != ENOENT) {
+		if (autorun)
+			return 0;
+		else
+			die_errno(_("Unexpected error checking pipe"));
+	}
 
 	atexit(cleanup);
 	sigchain_push_common(cleanup_on_signal);

@@ -33,4 +33,12 @@ test_expect_success 'index-helper will not start if already running' '
 	grep "Already running" err
 '
 
+test_expect_success 'index-helper is quiet with --autorun' '
+	test_when_finished "git index-helper --kill" &&
+	git index-helper --kill &&
+	git index-helper --detach &&
+	test -p .git/index-helper.pipe &&
+	git index-helper --autorun
+'
+
 test_done