From: Alfredo Deza <alfredo.deza@inktank.com>
Date: Fri, 27 Jun 2014 16:26:34 +0000 (-0400)
Subject: explain a bit what we are doing with the regex
X-Git-Tag: v1.5.6~6^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F201%2Fhead;p=ceph-deploy.git

explain a bit what we are doing with the regex

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
---

diff --git a/vendor.py b/vendor.py
index 375b308..e1c714d 100644
--- a/vendor.py
+++ b/vendor.py
@@ -54,6 +54,10 @@ def vendor_library(name, version, cmd=None):
         run(['rm', '-rf', vendor_src])
 
     if path.exists(vendor_init):
+        # The following read/regex is done so that we can parse module metadata without the need
+        # to import it. Module metadata is defined as variables with double underscores. We are
+        # particularly insteresting in the version string, so we look into single or double quoted
+        # values, like:  __version__ = '1.0'
         module_file = open(vendor_init).read()
         metadata = dict(re.findall(r"__([a-z]+)__\s*=\s*['\"]([^'\"]*)['\"]", module_file))
         if metadata.get('version') != version: