git-gc --auto: add pre-auto-gc hook

If such a hook is available and exits with a non-zero status, then
git-gc --auto won't run.

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-gc.c b/builtin-gc.c
index 8cef36f6a4445b163b299f282785f66af9662cb8..f99ebc7926b95b04f1140d257da7a52bfc33ee50 100644 (file)
--- a/builtin-gc.c
+++ b/builtin-gc.c
@@ -157,6 +157,34 @@ static int too_many_packs(void)
        return gc_auto_pack_limit <= cnt;
 }
 
+static int run_hook(void)
+{
+       const char *argv[2];
+       struct child_process hook;
+       int ret;
+
+       argv[0] = git_path("hooks/pre-auto-gc");
+       argv[1] = NULL;
+
+       if (access(argv[0], X_OK) < 0)
+               return 0;
+
+       memset(&hook, 0, sizeof(hook));
+       hook.argv = argv;
+       hook.no_stdin = 1;
+       hook.stdout_to_stderr = 1;
+
+       ret = start_command(&hook);
+       if (ret) {
+               warning("Could not spawn %s", argv[0]);
+               return ret;
+       }
+       ret = finish_command(&hook);
+       if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
+               warning("%s exited due to uncaught signal", argv[0]);
+       return ret;
+}
+
 static int need_to_gc(void)
 {
        /*
@@ -176,6 +204,9 @@ static int need_to_gc(void)
                append_option(argv_repack, "-A", MAX_ADD);
        else if (!too_many_loose_objects())
                return 0;
+
+       if (run_hook())
+               return 0;
        return 1;
 }