code: def getVersion(init_file):
      
  
      try:
          return os.environ['BUILDBOT_VERSION']
      except KeyError:
          pass
  
      try:
          cwd = os.path.dirname(os.path.abspath(init_file))
          fn = os.path.join(cwd, 'VERSION')
          with open(fn) as f:
              return f.read().strip()
      except IOError:
          pass
  
      version = getVersionFromArchiveId()
      if version is not None:
          return version
  
      try:
          p = Popen(['git', 'describe', '--tags', '--always'], stdout=PIPE, stderr=STDOUT, cwd=cwd)
          out = p.communicate()[0]
  
          if (not p.returncode) and out:
              v = gitDescribeToPep440(str(out))
              if v:
                  return v
      except OSError:
          pass
  
      try:
          # if we really can't find the version, we use the date of modification of the most recent file
          # docker hub builds cannot use git describe
          return mTimeVersion(init_file)
      except Exception:
          # bummer. lets report something
          return "latest"
docs: Return BUILDBOT_VERSION environment variable, content of VERSION file, git
      tag or 'latest'