From: Zooko O'Whielacronx <zooko@zooko.com>
Date: Thu, 16 Aug 2007 23:16:41 +0000 (-0700)
Subject: version_class.py: if you don't have pkg_resources for comparing version numbers,... 
X-Git-Url: https://git.rkrishnan.org/specifications/index.php?a=commitdiff_plain;h=5a1d4aa8b70e929672dad19c99d08c4888e5d940;p=tahoe-lafs%2Ftahoe-lafs.git

version_class.py: if you don't have pkg_resources for comparing version numbers, use distutils.version.LooseVersion
---

diff --git a/src/allmydata/util/version_class.py b/src/allmydata/util/version_class.py
index dbab3b87..da6fe488 100644
--- a/src/allmydata/util/version_class.py
+++ b/src/allmydata/util/version_class.py
@@ -10,7 +10,15 @@ extended version number class
 """
 
 # from setuptools, but intended to be included in future version of Python Standard Library (PEP 365)
-import pkg_resources
+try:
+    import pkg_resources
+except ImportError:
+    import distutils.version
+    def cmp_version(v1, v2):
+        return cmp(distutils.version.LooseVersion(str(v1)), distutils.version.LooseVersion(str(v2)))
+else:
+    def cmp_version(v1, v2):
+        return cmp(pkg_resources.parse_version(str(v1)), pkg_resources.parse_version(str(v2)))
 
 # bindann, by Nathan Wilcox (needed only for debugging)
 try:
@@ -130,4 +138,4 @@ class Version(object):
         return self.__str__()
 
     def __cmp__ (self, other):
-        return cmp(pkg_resources.parse_version(str(self)), pkg_resources.parse_version(str(other)))
+        return cmp_version(self, other)