bincvs.py 文件源码

def _check_path(pathname):
    try:
      info = os.stat(pathname)
    except os.error, e:
      return None, ["stat error: %s" % e]

    kind = None
    errors = []

    mode = info[stat.ST_MODE]
    isdir = stat.S_ISDIR(mode)
    isreg = stat.S_ISREG(mode)
    if isreg or isdir:
      #
      # Quick version of access() where we use existing stat() data.
      #
      # This might not be perfect -- the OS may return slightly different
      # results for some bizarre reason. However, we make a good show of
      # "can I read this file/dir?" by checking the various perm bits.
      #
      # NOTE: if the UID matches, then we must match the user bits -- we
      # cannot defer to group or other bits. Similarly, if the GID matches,
      # then we must have read access in the group bits.
      #
      # If the UID or GID don't match, we need to check the
      # results of an os.access() call, in case the web server process
      # is in the group that owns the directory.
      #
      if isdir:
        mask = stat.S_IROTH | stat.S_IXOTH
      else:
        mask = stat.S_IROTH

      if info[stat.ST_UID] == _uid:
        if ((mode >> 6) & mask) != mask:
          errors.append("error: path is not accessible to user %i" % _uid)
      elif info[stat.ST_GID] == _gid:
        if ((mode >> 3) & mask) != mask:
          errors.append("error: path is not accessible to group %i" % _gid)
      # If the process running the web server is a member of
      # the group stat.ST_GID access may be granted.
      # so the fall back to os.access is needed to figure this out.
      elif (mode & mask) != mask:
        if not os.access(pathname, isdir and (os.R_OK | os.X_OK) or os.R_OK):
          errors.append("error: path is not accessible")

      if isdir:
        kind = vclib.DIR
      else:
        kind = vclib.FILE

    else:
      errors.append("error: path is not a file or directory")

    return kind, errors