Always write .landmines

build/landmines.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """
 This script runs every build as a hook. If it detects that the build should
 be clobbered, it will touch the file <build_dir>/.landmine_triggered. The
 various build scripts will then check for the presence of this file and clobber
 accordingly. The script will also emit the reasons for the clobber to stdout.
@@ skipping 46 matching lines @@
   out_dir = get_target_build_dir(landmine_utils.builder(), target,
                                  landmine_utils.platform() == 'ios')
 
   landmines_path = os.path.join(out_dir, '.landmines')
   try:
     os.makedirs(out_dir)
   except OSError as e:
     if e.errno == errno.EEXIST:
       pass
 
-  if not os.path.exists(landmines_path):
-    with open(landmines_path, 'w') as f:
-      f.writelines(new_landmines)
-  else:
+  if os.path.exists(landmines_path):
     triggered = os.path.join(out_dir, '.landmines_triggered')
     with open(landmines_path, 'r') as f:
       old_landmines = f.readlines()
     if old_landmines != new_landmines:
       old_date = time.ctime(os.stat(landmines_path).st_ctime)
       diff = difflib.unified_diff(old_landmines, new_landmines,
           fromfile='old_landmines', tofile='new_landmines',
           fromfiledate=old_date, tofiledate=time.ctime(), n=0)
 
       with open(triggered, 'w') as f:
         f.writelines(diff)
     elif os.path.exists(triggered):
       # Remove false triggered landmines.
       os.remove(triggered)
+  with open(landmines_path, 'w') as f:
+    f.writelines(new_landmines)
 
 
 def process_options():
   """Returns a list of landmine emitting scripts."""
   parser = optparse.OptionParser()
   parser.add_option(
       '-s', '--landmine-scripts', action='append',
       default=[os.path.join(SRC_DIR, 'build', 'get_landmines.py')],
       help='Path to the script which emits landmines to stdout. The target '
            'is passed to this script via option -t. Note that an extra '
@@ skipping 32 matching lines @@
                               stdout=subprocess.PIPE)
       output, _ = proc.communicate()
       landmines.extend([('%s\n' % l.strip()) for l in output.splitlines()])
     set_up_landmines(target, landmines)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())