diff options
-rwxr-xr-x | rdiff-backup/python-rdiff | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/rdiff-backup/python-rdiff b/rdiff-backup/python-rdiff new file mode 100755 index 0000000..14896b8 --- /dev/null +++ b/rdiff-backup/python-rdiff @@ -0,0 +1,69 @@ +#!/usr/bin/env python + +import sys +from rdiff_backup import librsync + +blocksize = 64*1024 # just used in copying +librsync_blocksize = None # If not set, use defaults in _librsync module + +def usage(): + """Print usage and then exit""" + print """ +Usage: %(cmd)s "signature" basis_file signature_file + %(cmd)s "delta" signature_file new_file delta_file + %(cmd)s "patch" basis_file delta_file new_file +""" % {'cmd': sys.argv[0]} + sys.exit(1) + +def copy_and_close(infp, outfp): + """Copy file streams infp to outfp in blocks, closing when done""" + while 1: + buf = infp.read(blocksize) + if not buf: break + outfp.write(buf) + assert not infp.close() and not outfp.close() + +def write_sig(input_path, output_path): + """Open file at input_path, write signature to output_path""" + infp = open(input_path, "rb") + if librsync_blocksize: sigfp = librsync.SigFile(infp, librsync_blocksize) + else: sigfp = librsync.SigFile(infp) + copy_and_close(sigfp, open(output_path, "wb")) + +def write_delta(sig_path, new_path, output_path): + """Read signature and new file, write to delta to delta_path""" + deltafp = librsync.DeltaFile(open(sig_path, "rb"), open(new_path, "rb")) + copy_and_close(deltafp, open(output_path, "wb")) + +def write_patch(basis_path, delta_path, out_path): + """Patch file at basis_path with delta at delta_path, write to out_path""" + patchfp = librsync.PatchedFile(open(basis_path, "rb"), + open(delta_path, "rb")) + copy_and_close(patchfp, open(out_path, "wb")) + +def check_different(filelist): + """Make sure no files the same""" + d = {} + for file in filelist: d[file] = file + assert len(d) == len(filelist), "Error, must use all different filenames" + +def Main(): + """Run program""" + if len(sys.argv) < 4: usage() + mode = sys.argv[1] + file_args = sys.argv[2:] + check_different(file_args) + if mode == "signature": + if len(file_args) != 2: usage() + write_sig(*file_args) + elif mode == "delta": + if len(file_args) != 3: usage() + write_delta(*file_args) + elif mode == "patch": + if len(file_args) != 3: usage() + write_patch(*file_args) + else: usage() + + +if __name__ == "__main__": Main() + |