Soon, we'll want to automatically start index-helper, so we need
a mode that silently exits if it can't start up (either because
it's not in a git dir, or because another one is already running).

Signed-off-by: David Turner <dtur...@twopensource.com>
---
 index-helper.c          | 29 +++++++++++++++++++++++------
 t/t7900-index-helper.sh |  8 ++++++++
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/index-helper.c b/index-helper.c
index b62d805..4d08ff4 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -382,8 +382,9 @@ static void request_kill(void)
 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 socket_path = STRBUF_INIT;
        struct option options[] = {
                OPT_INTEGER(0, "exit-after", &idle_in_seconds,
@@ -392,6 +393,7 @@ 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()
        };
 
@@ -401,7 +403,14 @@ 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"));
@@ -415,10 +424,18 @@ int main(int argc, char **argv)
 
        /* check that no other copy is running */
        fd = connect_to_index_helper();
-       if (fd > 0)
-               die(_("Already running"));
-       if (errno != ECONNREFUSED && errno != ENOENT)
-               die_errno(_("Unexpected error checking socket"));
+       if (fd > 0) {
+               if (autorun)
+                       exit(0);
+               else
+                       die(_("Already running"));
+       }
+       if (errno != ECONNREFUSED && errno != ENOENT) {
+               if (autorun)
+                       return 0;
+               else
+                       die_errno(_("Unexpected error checking socket"));
+       }
 
        atexit(cleanup);
        sigchain_push_common(cleanup_on_signal);
diff --git a/t/t7900-index-helper.sh b/t/t7900-index-helper.sh
index 3f94d8a..3925ee3 100755
--- a/t/t7900-index-helper.sh
+++ b/t/t7900-index-helper.sh
@@ -42,4 +42,12 @@ 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 -L .git/index-helper.path &&
+       git index-helper --autorun
+'
+
 test_done
-- 
2.4.2.767.g62658d5-twtrsrc

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