backups.py 文件源码

def get_stamp(stampdir):
    stampfile = os.path.join(stampdir,'stamp')

    # read first line of stamp file
    f = open(stampfile,mode='rt')
    line = f.readline()
    f.close()

    # extract timestamp (first field of line) and compare to others
    stamp = int( line.split().pop(0) )
    if not stamp>0:
        raise BackupError("Can't read `{}'".format(stampfile))

    dt = datetime.utcfromtimestamp(stamp)
    return dt

# find a list of backups for a particular machine