Add a git-drover.

gclient-new-workdir.py

Index: gclient-new-workdir.py
diff --git a/gclient-new-workdir.py b/gclient-new-workdir.py
index 6c241c50b204480a10c1ed14bee441a1e41b774b..c469824753ec587771dd1bdf8da1e4dc7aefb67e 100755
--- a/gclient-new-workdir.py
+++ b/gclient-new-workdir.py
@@ -13,6 +13,8 @@ import subprocess
 import sys
 import textwrap
 
+import git_common
+
 
 def print_err(msg):
   print >> sys.stderr, msg
@@ -32,7 +34,7 @@ def usage(msg=None):
 
     <repository> should contain a .gclient file
     <new_workdir> must not exist
-    ''' % os.path.basename(sys.argv[0])
+    '''% os.path.basename(sys.argv[0])
 
   print_err(textwrap.dedent(usage_msg))
   sys.exit(1)
@@ -70,43 +72,11 @@ def main():
   for root, dirs, _ in os.walk(repository):
     if '.git' in dirs:
       workdir = root.replace(repository, new_workdir, 1)
-      make_workdir(os.path.join(root, '.git'),
-                   os.path.join(workdir, '.git'))
-
-
-def make_workdir(repository, new_workdir):
-  print('Creating: ' + new_workdir)
-  os.makedirs(new_workdir)
-
-  GIT_DIRECTORY_WHITELIST = [
-    'config',
-    'info',
-    'hooks',
-    'logs/refs',
-    'objects',
-    'packed-refs',
-    'refs',
-    'remotes',
-    'rr-cache',
-    'svn'
-  ]
-
-  for entry in GIT_DIRECTORY_WHITELIST:
-    make_symlink(repository, new_workdir, entry)
-
-  shutil.copy2(os.path.join(repository, 'HEAD'),
-               os.path.join(new_workdir, 'HEAD'))
-  subprocess.check_call(['git', 'checkout', '-f'],
-                        cwd=new_workdir.rstrip('.git'))
-
-
-def make_symlink(repository, new_workdir, link):
-  if not os.path.exists(os.path.join(repository, link)):
-    return
-  link_dir = os.path.dirname(os.path.join(new_workdir, link))
-  if not os.path.exists(link_dir):
-    os.makedirs(link_dir)
-  os.symlink(os.path.join(repository, link), os.path.join(new_workdir, link))
+      print('Creating: %s' % workdir)
+      git_common.make_workdir(os.path.join(root, '.git'),
+                              os.path.join(workdir, '.git'))
+      subprocess.check_call(['git', 'checkout', '-f'],
+                            cwd=new_workdir.rstrip('.git'))
 
 
 if __name__ == '__main__':