util.py 文件源码

def is_file_readable(filepath):
    """
    Check if the file given is readable to the user we are currently running
    at
    """
    uid = os.getuid()
    euid = os.geteuid()
    gid = os.getgid()
    egid = os.getegid()

    # This is probably true most of the time, so just let os.access()
    # handle it.  Avoids potential bugs in the rest of this function.
    if uid == euid and gid == egid:
        return os.access(filepath, os.R_OK)

    st = os.stat(filepath)

    if st.st_uid == euid:
        return st.st_mode & stat.S_IRUSR != 0

    groups = os.getgroups()
    if st.st_gid == egid or st.st_gid in groups:
        return st.st_mode & stat.S_IRGRP != 0

    return st.st_mode & stat.S_IROTH != 0