build: sanitize non-alpha characters in builder cache path

scripts/slave/recipe_modules/chromium/api.py

 # Copyright 2013 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.
 
 import re
 
 from recipe_engine import recipe_api
 from recipe_engine import util as recipe_util
 
 class TestLauncherFilterFileInputPlaceholder(recipe_util.InputPlaceholder):
@@ skipping 82 matching lines @@
   @property
   def output_dir(self):
     """Return the path to the built executable directory."""
     # TODO(phajdan.jr): output_dir is deprecated in favor of get_output_dir.
     return self.c.build_dir.join(self.c.build_config_fs)
 
   def get_output_dir(self, target=None):
     """Return the path to the build executable directory."""
     build_dir = self.c.build_dir
     if self.c.use_build_dir_cache:
-      build_dir = build_dir.join(self.m.properties['buildername'])
+      sanitized_buildername = ''.join(c if c.isalnum() else '_'
+                                      for c in self.m.properties['buildername'])
+      build_dir = build_dir.join(sanitized_buildername)
     return self.m.path.join(build_dir, target or self.c.build_config_fs)
 
   @property
   def version(self):
     """Returns a version dictionary (after get_version()), e.g.
 
     { 'MAJOR'": '37', 'MINOR': '0', 'BUILD': '2021', 'PATCH': '0' }
     """
     text = self._version
     output = {}
@@ skipping 641 matching lines @@
       }))
 
   def get_annotate_by_test_name(self, test_name):
     return 'graphing'
 
   def download_lto_plugin(self):
     return self.m.python(
         name='download LTO plugin',
         script=self.m.path['checkout'].join(
             'build', 'download_gold_plugin.py'))