Fix File() to work with SVN 1.4 by using svn export in place...

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 731 matching lines @@
       return
 
     command = ["update", checkout_path]
     if revision:
       command.extend(['--revision', str(revision)])
     scm.SVN.RunAndGetFileList(options, command, self._root_dir, file_list)
 
   def updatesingle(self, options, args, file_list):
     checkout_path = os.path.join(self._root_dir, self.relpath)
     filename = args.pop()
-    if not os.path.exists(checkout_path):
-      # Create an empty checkout and then update the one file we want.  Future
-      # operations will only apply to the one file we checked out.
-      command = ["checkout", "--depth", "empty", self.url, checkout_path]
+    if scm.SVN.AssertVersion("1.5")[0]:
+      if not os.path.exists(os.path.join(checkout_path, '.svn')):
+        # Create an empty checkout and then update the one file we want.  Future
+        # operations will only apply to the one file we checked out.
+        command = ["checkout", "--depth", "empty", self.url, checkout_path]
+        scm.SVN.Run(command, self._root_dir)
+        if os.path.exists(os.path.join(checkout_path, filename)):
+          os.remove(os.path.join(checkout_path, filename))
+        command = ["update", filename]
+        scm.SVN.RunAndGetFileList(options, command, checkout_path, file_list)
+      # After the initial checkout, we can use update as if it were any other
+      # dep.
+      self.update(options, args, file_list)
+    else:
+      # If the installed version of SVN doesn't support --depth, fallback to
+      # just exporting the file.  This has the downside that revision
+      # information is not stored next to the file, so we will have to
+      # re-export the file every time we sync.
+      if not os.path.exists(checkout_path):
+        os.makedirs(checkout_path)
+      command = ["export", os.path.join(self.url, filename),
+                 os.path.join(checkout_path, filename)]
+      if options.revision:
+        command.extend(['--revision', str(options.revision)])
       scm.SVN.Run(command, self._root_dir)
-      command = ["update", filename]
-      scm.SVN.RunAndGetFileList(options, command, checkout_path, file_list)
-    # After the initial checkout, we can use update as if it were any other
-    # dep.
-    self.update(options, args, file_list)
 
   def revert(self, options, args, file_list):
     """Reverts local modifications. Subversion specific.
 
     All reverted files will be appended to file_list, even if Subversion
     doesn't know about them.
     """
     __pychecker__ = 'unusednames=args'
     path = os.path.join(self._root_dir, self.relpath)
     if not os.path.isdir(path):
@@ skipping 63 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:
       scm.SVN.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