Revert of Added orphaned compiled Python file checks.

presubmit_support.py

Index: presubmit_support.py
diff --git a/presubmit_support.py b/presubmit_support.py
index d4400554d24bc78e6a217a2ce3987b484e7f2239..b386524068c1ceddc44fc4e10edc4c596d6f577c 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -1287,6 +1287,7 @@
     Return:
       A list of result objects, empty if no problems.
     """
+
     # Change to the presubmit file's directory to support local imports.
     main_path = os.getcwd()
     os.chdir(os.path.dirname(presubmit_path))
@@ -1335,8 +1336,7 @@
                       input_stream,
                       default_presubmit,
                       may_prompt,
-                      rietveld_obj,
-                      cleanup=False):
+                      rietveld_obj):
   """Runs all presubmit checks that apply to the files in the change.
 
   This finds all PRESUBMIT.py files in directories enclosing the files in the
@@ -1355,8 +1355,6 @@
     default_presubmit: A default presubmit script to execute in any case.
     may_prompt: Enable (y/n) questions on warning or error.
     rietveld_obj: rietveld.Rietveld object.
-    cleanup: If True, filesystem modifications may be made as necessary to
-             clean up repository state to ensure reliable checks.
 
   Warning:
     If may_prompt is true, output_stream SHOULD be sys.stdout and input_stream
@@ -1368,10 +1366,6 @@
   """
   old_environ = os.environ
   try:
-    # Clear all orphaned compiled Python files.
-    CleanOrphanedCompiledPython(output_stream, change.RepositoryRoot(),
-                                remove=cleanup)
-
     # Make sure python subprocesses won't generate .pyc files.
     os.environ = os.environ.copy()
     os.environ['PYTHONDONTWRITEBYTECODE'] = '1'
@@ -1446,46 +1440,6 @@
     return output
   finally:
     os.environ = old_environ
-
-
-def IsCompiledPython(path):
-  """Tests whether a given path looks like a compiled Python file."""
-  # Validate the magic number.
-  with open(path, 'rb') as fd:
-    magic = fd.read(8)
-  return len(magic) == 8 and magic[2:4] == '\x0d\x0a'
-
-
-def CleanOrphanedCompiledPython(output, path, remove):
-  """Clears all compiled Python files in a directory recursively."""
-  pyc_files = []
-  for dirpath, _, filenames in os.walk(path):
-    for filename in filenames:
-      name, ext = os.path.splitext(filename)
-      if ext != '.pyc':
-        continue
-
-      # Is there an accompanying Python script? If so, leave the compiled file.
-      py_path = os.path.join(dirpath, '%s.py' % (name,))
-      if os.path.isfile(py_path):
-        continue
-
-      # Make sure this is compiled Python before we delete it.
-      path = os.path.join(dirpath, filename)
-      if not IsCompiledPython(path):
-        continue
-      pyc_files.append(path)
-  if pyc_files and not remove:
-    output.write(
-        'Warning: Found orphaned compiled Python files. These should be\n'
-        'removed before running PRESUBMIT, as they can have unexpected impact\n'
-        'on checks and tests:\n')
-    for pyc_file in pyc_files:
-      output.write('  %s\n' % (pyc_file,))
-  else:
-    for pyc_file in pyc_files:
-      output.write('Removing orphaned compiled Python file: %s\n' % (pyc_file,))
-      os.remove(pyc_file)
 
 
 def ScanSubDirs(mask, recursive):