Make gclient ready for the Blink (DEPS to main project) transition

gclient.py

Index: gclient.py
diff --git a/gclient.py b/gclient.py
index f6db225c11c0d94e834580728faf3fad74011ed1..22a4eb96a369c59ef900c2abff35e331af21ecb9 100755
--- a/gclient.py
+++ b/gclient.py
@@ -1542,23 +1542,18 @@ been automagically updated.  The previous version is available at %s.old.
         # Fix path separator on Windows.
         entry_fixed = entry.replace('/', os.path.sep)
         e_dir = os.path.join(self.root_dir, entry_fixed)
-
-        def _IsParentOfAny(parent, path_list):
-          parent_plus_slash = parent + '/'
-          return any(
-              path[:len(parent_plus_slash)] == parent_plus_slash
-              for path in path_list)
-
         # Use entry and not entry_fixed there.
         if (entry not in entries and
             (not any(path.startswith(entry + '/') for path in entries)) and
             os.path.exists(e_dir)):
+          # The entry has been removed from DEPS.
           scm = gclient_scm.CreateSCM(
               prev_url, self.root_dir, entry_fixed, self.outbuf)
 
           # Check to see if this directory is now part of a higher-up checkout.
           # The directory might be part of a git OR svn checkout.
           scm_root = None
+          scm_class = None
           for scm_class in (gclient_scm.scm.GIT, gclient_scm.scm.SVN):
             try:
               scm_root = scm_class.GetCheckoutRoot(scm.checkout_path)
@@ -1571,9 +1566,45 @@ been automagically updated.  The previous version is available at %s.old.
                             'determine whether it is part of a higher-level '
                             'checkout, so not removing.' % entry)
             continue
+
+          # This is to handle the case of third_party/WebKit migrating from
+          # being a DEPS entry to being part of the main project.
+          # If the subproject is a Git project, we need to remove its .git
+          # folder. Otherwise git operations on that folder will have different
+          # effects depending on the current working directory.
+          if scm_class == gclient_scm.scm.GIT and (
+              os.path.abspath(scm_root) == os.path.abspath(e_dir)):
+            e_par_dir = os.path.join(e_dir, os.pardir)
+            if scm_class.IsInsideWorkTree(e_par_dir):
+              par_scm_root = scm_class.GetCheckoutRoot(e_par_dir)
+              # rel_e_dir : relative path of entry w.r.t. its parent repo.
+              rel_e_dir = os.path.relpath(e_dir, par_scm_root)
+              if scm_class.IsDirectoryVersioned(par_scm_root, rel_e_dir):
+                save_dir = scm.GetGitBackupDirPath()
+                # Remove any eventual stale backup dir for the same project.
+                if os.path.exists(save_dir):
+                  gclient_utils.rmtree(save_dir)
+                os.rename(os.path.join(e_dir, '.git'), save_dir)
+                # When switching between the two states (entry/ is a subproject
+                # -> entry/ is part of the outer project), it is very likely
+                # that some files are changed in the checkout, unless we are
+                # jumping *exactly* across the commit which changed just DEPS.
+                # In such case we want to cleanup any eventual stale files
+                # (coming from the old subproject) in order to end up with a
+                # clean checkout.
+                scm_class.CleanupDir(par_scm_root, rel_e_dir)
+                assert not os.path.exists(os.path.join(e_dir, '.git'))
+                print(('\nWARNING: \'%s\' has been moved from DEPS to a higher '
+                       'level checkout. The git folder containing all the local'
+                       ' branches has been saved to %s.\n'
+                       'If you don\'t care about its state you can safely '
+                       'remove that folder to free up space.') %
+                      (entry, save_dir))
+                continue
+
           if scm_root in full_entries:
-            logging.info('%s is part of a higher level checkout, not '
-                         'removing.', scm.GetCheckoutRoot())
+            logging.info('%s is part of a higher level checkout, not removing',
+                         scm.GetCheckoutRoot())
             continue
 
           file_list = []