increment.py 文件源码

def Increment(new, mirror, incpref):
    """Main file incrementing function, returns inc file created

    new is the file on the active partition,
    mirror is the mirrored file from the last backup,
    incpref is the prefix of the increment file.

    This function basically moves the information about the mirror
    file to incpref.

    """
    log.Log("Incrementing mirror file " + mirror.path, 5)
    if ((new and new.isdir()) or mirror.isdir()) and not incpref.lstat():
        incpref.mkdir()

    if not mirror.lstat(): incrp = makemissing(incpref)
    elif mirror.isdir(): incrp = makedir(mirror, incpref)
    elif new.isreg() and mirror.isreg():
        incrp = makediff(new, mirror, incpref)
    else: incrp = makesnapshot(mirror, incpref)
    statistics.process_increment(incrp)
    return incrp