Make gclient warn when svn is used.

Include links to the tracking bug and to request creating git repositories. Also
include note how to keep subversion support, if users require this.

It won't warn when git-svn clones are used.

There is no functional change except printing a warning to stderr.

Remove stale code. The CHROMIUM_SRC_URL variable is also defined in gclient.py
so it looks like a copy-paste error.

R=iannucci@chromium.org
BUG=475320

Review URL: https://codereview.chromium.org/1154173003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295478 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -29,7 +29,7 @@ THIS_FILE_PATH = os.path.abspath(__file__)
 GSUTIL_DEFAULT_PATH = os.path.join(
     os.path.dirname(os.path.abspath(__file__)), 'gsutil.py')
 
-CHROMIUM_SRC_URL = 'https://chromium.googlesource.com/chromium/src.git'
+
 class DiffFiltererWrapper(object):
   """Simple base class which tracks which file is being diffed and
   replaces instances of its file name in the original and
@@ -830,12 +830,6 @@ class GitWrapper(SCMWrapper):
         'print_func': self.filter,
         'refs': []
     }
-    # TODO(hinoka): This currently just fails because lkcr/lkgr are branches
-    #               not tags. This also adds 20 seconds to every bot_update
-    #               run, so I'm commenting this out until lkcr/lkgr become
-    #               tags.  (2014/4/24)
-    # if url == CHROMIUM_SRC_URL or url + '.git' == CHROMIUM_SRC_URL:
-    #  mirror_kwargs['refs'].extend(['refs/tags/lkgr', 'refs/tags/lkcr'])
     if hasattr(options, 'with_branch_heads') and options.with_branch_heads:
       mirror_kwargs['refs'].append('refs/branch-heads/*')
     if hasattr(options, 'with_tags') and options.with_tags:
@@ -1168,6 +1162,25 @@ class GitWrapper(SCMWrapper):
 class SVNWrapper(SCMWrapper):
   """ Wrapper for SVN """
   name = 'svn'
+  _PRINTED_DEPRECATION = False
+
+  _MESSAGE = (
+    'Oh hai! You are using subversion. Chrome infra is eager to get rid of',
+    'svn support so please switch to git.',
+    'Tracking bug: http://crbug.com/475320',
+    'Request a new git repository at: ',
+    '  https://code.google.com/p/chromium/issues/entry?template=Infra-Git',
+    '',
+    'If subversion support is needed, pin your depot_tools to ',
+    'c20f470011e2ea4d81527976f3bded2c13e258af and set the env var',
+    'DEPOT_TOOLS_UPDATE=0',
+    'Thank you for your business!')
+
+  def __init__(self, *args, **kwargs):
+    super(SVNWrapper, self).__init__(*args, **kwargs)
+    if not SVNWrapper._PRINTED_DEPRECATION:
+      SVNWrapper._PRINTED_DEPRECATION = True
+      sys.stderr.write('\n'.join(self._MESSAGE) + '\n')
 
   @staticmethod
   def BinaryExists():