From e21526754be58523c673d29731ee01d80e0ffc31 Mon Sep 17 00:00:00 2001
From: Dave Borowitz <dborowitz@google.com>
Date: Wed, 31 Oct 2012 12:24:38 -0700
Subject: [PATCH] sync: Only parallelize gc for git >= 1.7.2

This minimum version is required for the -c argument to set config on
the command line. Without this option, git by default uses as many
threads per invocation as there are CPUs, so we cannot safely
parallelize without hosing a system.

Change-Id: I8fd313dd84917658162b5134b2d9aa34a96f2772
---
 subcmds/sync.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/subcmds/sync.py b/subcmds/sync.py
index 8e9477a3..15f69f7b 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -44,7 +44,7 @@ try:
 except ImportError:
   multiprocessing = None
 
-from git_command import GIT
+from git_command import GIT, git_require
 from git_refs import R_HEADS, HEAD
 from main import WrapperModule
 from project import Project
@@ -310,7 +310,8 @@ later is required to fix a server side protocol bug.
     return fetched
 
   def _GCProjects(self, projects):
-    if multiprocessing:
+    has_dash_c = git_require((1, 7, 2))
+    if multiprocessing and has_dash_c:
       cpu_count = multiprocessing.cpu_count()
     else:
       cpu_count = 1