gclient: Add a minimum git version check.

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 re
 import subprocess
@@ skipping 97 matching lines @@
 
     All updated files will be appended to file_list.
 
     Raises:
       Error: if can't get URL for relative path.
     """
 
     if args:
       raise gclient_utils.Error("Unsupported argument(s): %s" % ",".join(args))
 
+    self._CheckMinVersion("1.6.1")
+
     url, revision = gclient_utils.SplitUrlRevision(self.url)
     rev_str = ""
     if options.revision:
       # Override the revision number.
       revision = str(options.revision)
     if revision:
       rev_str = ' at %s' % revision
 
     if options.verbose:
       print("\n_____ %s%s" % (self.relpath, rev_str))
@@ skipping 50 matching lines @@
     __pychecker__ = 'unusednames=args,options'
     if not os.path.isdir(self.checkout_path):
       print('\n________ couldn\'t run status in %s:\nThe directory '
             'does not exist.' % self.checkout_path)
     else:
       merge_base = self._Run(['merge-base', 'HEAD', 'origin'])
       self._Run(['diff', '--name-status', merge_base], redirect_stdout=False)
       files = self._Run(['diff', '--name-only', merge_base]).split()
       file_list.extend([os.path.join(self.checkout_path, f) for f in files])
 
+  def _CheckMinVersion(self, min_version):
+    version = self._Run(['--version']).split()[-1]
+    version_list = map(int, version.split('.'))
+    min_version_list = map(int, min_version.split('.'))

[M-A Ruel, 2009/12/11 19:51:54]

Nice idea, I wouldn't have thought about that.

+    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
+
   def _Run(self, args, cwd=None, checkrc=True, redirect_stdout=True):
     # TODO(maruel): Merge with Capture?
     if cwd is None:
         cwd = self.checkout_path
     stdout=None
     if redirect_stdout:
       stdout=subprocess.PIPE
     if cwd == None:
       cwd = self.checkout_path
     cmd = [self.COMMAND]
@@ skipping 262 matching lines @@
           self.ReplaceAndPrint(line)
         else:
           if (line.startswith(self.original_prefix) or
               line.startswith(self.working_prefix)):
             self.ReplaceAndPrint(line)
           else:
             print line
 
     filterer = DiffFilterer(self.relpath)
     self.RunAndFilterOutput(command, path, False, False, filterer.Filter)