Fix the tree by stating to right path.

bin/cbuildbot.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """CBuildbot is wrapper around the build process used by the pre-flight queue"""
 
 import errno
 import heapq
@@ skipping 388 matching lines @@
   test_results_dir: Path from buildroot/chroot to find test results.  This must
     a subdir of /tmp.
   """
   test_results_dir = test_results_dir.lstrip('/')
   if not os.path.exists(ARCHIVE_BASE):
     os.makedirs(ARCHIVE_BASE)
   else:
     dir_entries = os.listdir(ARCHIVE_BASE)
     if len(dir_entries) >= ARCHIVE_COUNT:
       oldest_dirs = heapq.nsmallest((len(dir_entries) - ARCHIVE_COUNT) + 1,
-                                    [filename for filename in dir_entries],
-                                    key=lambda fn: os.stat(fn).st_mtime)
+          [os.path.join(ARCHIVE_BASE, filename) for filename in dir_entries],
+          key=lambda fn: os.stat(fn).st_mtime)
       Info('Removing archive dirs %s' % oldest_dirs)
       for oldest_dir in oldest_dirs:
         shutil.rmtree(os.path.join(ARCHIVE_BASE, oldest_dir))
 
   archive_target = os.path.join(ARCHIVE_BASE, str(archive_dir))
   if os.path.exists(archive_target):
     shutil.rmtree(archive_target)
 
   results_path = os.path.join(buildroot, 'chroot', test_results_dir)
   RunCommand(['sudo', 'chmod', '-R', '+r', results_path])
@@ skipping 122 matching lines @@
   except:
     # Send failure to master bot.
     if not buildconfig['master'] and buildconfig['important']:
       cbuildbot_comm.PublishStatus(cbuildbot_comm.STATUS_BUILD_FAILED)
 
     raise
 
 
 if __name__ == '__main__':
     main()