Temporarily make find_xcode.py prefix match on the tryserver

scripts/slave/ios/find_xcode.py

 #!/usr/bin/python
 # Copyright 2015 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.
 
 """Switch to the given Xcode version.
 
 Usage:
   ./find_xcode.py -j /tmp/out.json -v 6.0.1
 
@@ skipping 121 matching lines @@
       xcodebuild = get_xcodebuild_path(app)
 
       if os.path.exists(xcodebuild):
         version, build_version = get_xcode_version(xcodebuild)
 
         xcode_info['installations'][installation_path] = "%s (%s)" % (
           version,
           build_version,
         )
 
-        if version == target_version:
-          xcode_info['matches'][installation_path] = "%s (%s)" % (
-            version,
-            build_version,
-          )
+        # TODO(smut): Remove prefix matching hack when http://crbug.com/461005
+        # is fixed.
+        if os.environ.get('BUILDBOT_MASTERNAME') == 'tryserver.chromium.mac':
+          if version.startswith(target_version):
+            xcode_info['matches'][installation_path] = "%s (%s)" % (
+              version,
+              build_version,
+            )
+        else:
+          if version == target_version:
+            xcode_info['matches'][installation_path] = "%s (%s)" % (
+              version,
+              build_version,
+            )
 
           # If this is the first match, switch to it.
           if not xcode_info['found']:
             utils.call(
               'sudo',
               'xcode-select',
               '-switch',
               os.path.join('/', 'Applications', app),
             )
 
@@ skipping 26 matching lines @@
   parser.add_argument(
     '-v',
     '--version',
     help='Xcode version to find and switch to.',
     metavar='ver',
     required=True,
     type=str,
   )
 
   sys.exit(main(parser.parse_args()))