Signed-off-by: David Turner <dtur...@twopensource.com>
---
 index-helper.c          | 7 +++++++
 t/t7900-index-helper.sh | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/index-helper.c b/index-helper.c
index 4ed1610..b275f6e 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -458,6 +458,13 @@ int main(int argc, char **argv)
                return 0;
        }
 
+       /* check that no other copy is running */
+       fd = unix_stream_connect(git_path("index-helper.sock"));
+       if (fd > 0)
+               die(_("Already running"));
+       if (errno != ECONNREFUSED && errno != ENOENT)
+               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 e71b5af..7159971 100755
--- a/t/t7900-index-helper.sh
+++ b/t/t7900-index-helper.sh
@@ -29,4 +29,13 @@ test_expect_success 'index-helper creates usable path file 
and can be killed' '
        test_path_is_missing .git/index-helper.sock
 '
 
+test_expect_success 'index-helper will not start if already running' '
+       test_when_finished "git index-helper --kill" &&
+       git index-helper --detach &&
+       test -S .git/index-helper.sock &&
+       test_must_fail git index-helper 2>err &&
+       test -S .git/index-helper.sock &&
+       grep "Already running" err
+'
+
 test_done
-- 
2.4.2.767.g62658d5-twtrsrc

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