Extract git version check code from gclient_scm.py into scm.py where it belongs.

gclient_scm.py

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Gclient-specific SCM-specific operations."""
 
 import logging
 import os
 import posixpath
 import re
@@ skipping 537 matching lines @@
 
     print rebase_output.strip()
     if rebase_err:
       print "Rebase produced error output:\n%s" % rebase_err.strip()
     if not verbose:
       # Make the output a little prettier. It's nice to have some
       # whitespace between projects when syncing.
       print ""
 
   def _CheckMinVersion(self, min_version):
-    def only_int(val):
-      if val.isdigit():
-        return int(val)
-      else:
-        return 0
-    version = self._Run(['--version'], cwd='.').split()[-1]
-    version_list = map(only_int, version.split('.'))
-    min_version_list = map(int, min_version.split('.'))
-    for min_ver in min_version_list:
-      ver = version_list.pop(0)
-      if min_ver > ver:
-        raise gclient_utils.Error('git version %s < minimum required %s' %
-                                  (version, min_version))
-      elif min_ver < ver:
-        return
+    (ok, current_version) = scm.GIT.AssertVersion(min_version)
+    if not ok:
+      raise gclient_utils.Error('git version %s < minimum required %s' %
+                                (current_version, min_version))
 
   def _GetCurrentBranch(self):
     # Returns name of current branch
     # Returns None if inside a (no branch)
     tokens = self._Run(['branch']).split()
     branch = tokens[tokens.index('*') + 1]
     if branch == '(no':
       return None
     return branch
 
@@ skipping 248 matching lines @@
       print("\n________ couldn't run \'%s\' in \'%s\':\nThe directory "
             "does not exist."
             % (' '.join(command), path))
       # There's no file list to retrieve.
     else:
       self.RunAndGetFileList(options, command, path, file_list)
 
   def FullUrlForRelativeUrl(self, url):
     # Find the forth '/' and strip from there. A bit hackish.
     return '/'.join(self.url.split('/')[:4]) + url