#!/usr/bin/env?python

#?Copyright?（c）?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.

import?os
import?sys

version?=?sys.version_info[:2]
if?version?!=?（2?7）:
??sys.stderr.write（‘Systrace?does?not?support?Python?%d.%d.?‘
???????????????????‘Please?use?Python?2.7.\n‘?%?version）
??sys.exit（1）

systrace_dir?=?os.path.abspath（
????os.path.join（os.path.dirname（__file__）?‘catapult‘?‘systrace‘））
sys.path.insert（0?systrace_dir）

def?RemoveAllStalePycFiles（base_dir）:
??“““Scan?directories?for?old?.pyc?files?without?a?.py?file?and?delete?them.“““
??for?dirname?_?filenames?in?os.walk（base_dir）:
????if?‘.git‘?in?dirname:
??????continue
????for?filename?in?filenames:
??????root?ext?=?os.path.splitext（filename）
??????if?ext?!=?‘.pyc‘:
????????continue

??????pyc_path?=?os.path.join（dirname?filename）
??????py_path?=?os.path.join（dirname?root?+?‘.py‘）

??????try:
????????if?not?os.path.exists（py_path）:
??????????os.remove（pyc_path）
??????except?OSError:
????????#?Wrap?OS?calls?in?try/except?in?case?another?process?touched?this?file.
????????pass

????try:
??????os.removedirs（dirname）
????except?OSError:
??????#?Wrap?OS?calls?in?try/except?in?case?another?process?touched?this?dir.
??????pass

if?__name__?==?‘__main__‘:
??RemoveAllStalePycFiles（os.path.dirname（__file__））
??from?systrace?import?run_systrace
??sys.exit（run_systrace.main（））