gc: Add --quiet option

Pass -q option to git-repack.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-gc.txt

@@ -8,7 +8,7 @@ git-gc - Cleanup unnecessary files and optimize the local repository
 
 SYNOPSIS
 --------
-'git-gc' [--prune] [--aggressive] [--auto]
+'git-gc' [--prune] [--aggressive] [--auto] [--quiet]
 
 DESCRIPTION
 -----------
@@ -63,6 +63,9 @@ are consolidated into a single pack by using the `-A` option of
 `git-repack`. Setting `gc.autopacklimit` to 0 disables
 automatic consolidation of packs.
 
+--quiet::
+	Suppress all progress reports.
+
 Configuration
 -------------
 

builtin-gc.c

@@ -172,12 +172,14 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
 	int prune = 0;
 	int aggressive = 0;
 	int auto_gc = 0;
+	int quiet = 0;
 	char buf[80];
 
 	struct option builtin_gc_options[] = {
 		OPT_BOOLEAN(0, "prune", &prune, "prune unreferenced objects"),
 		OPT_BOOLEAN(0, "aggressive", &aggressive, "be more thorough (increased runtime)"),
 		OPT_BOOLEAN(0, "auto", &auto_gc, "enable auto-gc mode"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "suppress progress reports"),
 		OPT_END()
 	};
 
@@ -197,6 +199,8 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
 			append_option(argv_repack, buf, MAX_ADD);
 		}
 	}
+	if (quiet)
+		append_option(argv_repack, "-q", MAX_ADD);
 
 	if (auto_gc) {
 		/*