1 files changed, 19 insertions, 0 deletions
diff --git a/common.py b/common.py
index 89e4996..8e0c14c 100644
--- a/common.py
+++ b/common.py
@@ -1,10 +1,12 @@
 # Copyright 2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
+import functools
 import io
 import datetime
 import getpass
 import re
+import time
 
 import portage
 
@@ -17,6 +19,23 @@ def chunks(iterable, length):
 		yield iterable[i:i + length]
 
 
+def retry(ExceptionToCheck, tries=4, delay=3, backoff=2):
+	def deco_retry(f):
+		@functools.wraps(f)
+		def f_retry(*args, **kwargs):
+			mtries, mdelay = tries, delay
+			while mtries > 1:
+				try:
+					return f(*args, **kwargs)
+				except ExceptionToCheck:
+					time.sleep(mdelay)
+					mtries -= 1
+					mdelay *= backoff
+			return f(*args, **kwargs)
+		return f_retry
+	return deco_retry
+
+
 # Snippet from http://bugs.python.org/issue9584
 def expand_braces(orig):
 	r = r'.*(\{.+?[^\\]\})'