mercurial/revlogutils/nodemap.py

46970:99aed233aa8d

    filename = _rawdata_filepath(revlog, docket)
    use_mmap = revlog.opener.options.get(b"persistent-nodemap.mmap")
    try:
        with revlog.opener(filename) as fd:
            if use_mmap:
                data = util.buffer(util.mmapread(fd, data_length))
            else:
                data = fd.read(data_length)
    except (IOError, OSError) as e:
        if e.errno == errno.ENOENT:
            return None

46971:a3720569a43f

    filename = _rawdata_filepath(revlog, docket)
    use_mmap = revlog.opener.options.get(b"persistent-nodemap.mmap")
    try:
        with revlog.opener(filename) as fd:
            if use_mmap:
                try:
                    data = util.buffer(util.mmapread(fd, data_length))
                except ValueError:
                    # raised when the read file is too small
                    data = b''
            else:
                data = fd.read(data_length)
    except (IOError, OSError) as e:
        if e.errno == errno.ENOENT:
            return None