[PATCH 1/4] git-gc --auto: add pre-auto-gc hook

[Miklos Vajna <vmiklos@frugalware.org>]

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>
---
 builtin-gc.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/builtin-gc.c b/builtin-gc.c
index 8cef36f..acd63be 100644
--- a/builtin-gc.c
+++ b/builtin-gc.c
@@ -157,6 +157,25 @@ static int too_many_packs(void)
 	return gc_auto_pack_limit <= cnt;
 }
 
+static int run_hook()
+{
+	const char *argv[2];
+	struct child_process hook;
+
+	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;
+
+	return run_command(&hook);
+}
+
 static int need_to_gc(void)
 {
 	/*
@@ -176,6 +195,9 @@ 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;
 }
 
-- 
1.5.5.rc2.4.g283c6