patchdir.py 文件源码

def patch_seq2ropath(patch_seq):
    """Apply the patches in patch_seq, return single ropath"""
    first = patch_seq[0]
    assert first.difftype != "diff", "First patch in sequence " \
                                     "%s was a diff" % patch_seq
    if not first.isreg():
        # No need to bother with data if not regular file
        assert len(patch_seq) == 1, "Patch sequence isn't regular, but " \
                                    "has %d entries" % len(patch_seq)
        return first.get_ropath()

    current_file = first.open("rb")

    for delta_ropath in patch_seq[1:]:
        assert delta_ropath.difftype == "diff", delta_ropath.difftype
        if not isinstance(current_file, file):
            """
            librsync insists on a real file object, which we create manually
            by using the duplicity.tempdir to tell us where.

            See https://bugs.launchpad.net/duplicity/+bug/670891 for discussion
            of os.tmpfile() vs tempfile.TemporaryFile() w.r.t. Windows / Posix,
            which is worked around in librsync.PatchedFile() now.
            """
            tempfp = tempfile.TemporaryFile(dir=tempdir.default().dir())
            util.copyfileobj(current_file, tempfp)
            assert not current_file.close()
            tempfp.seek(0)
            current_file = tempfp
        current_file = librsync.PatchedFile(current_file,
                                            delta_ropath.open("rb"))
    result = patch_seq[-1].get_ropath()
    result.setfileobj(current_file)
    return result