[NCLUG] Server-to-Server backups

[dann frazier]

I've been tweaking this script to do my rsync backups for a while.
It uses the --linkdest function of rsync to automatically hardlink
files back to the last backup if they aren't any different.

I haven't looked at any of the existing rsync backup scripts, I've
heard that rsync-diff style methods are better.

-- 
dann frazier

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#!/usr/bin/python

import os, sys
import optparse, datetime
import os.path, re

Version = "1.0.1"

if __name__ == '__main__':
    parser = optparse.OptionParser()
    parser.add_option("-d", "--directory", dest="dir",
                      help="Local directory for storing backups",
                      metavar="DIRECTORY")
    parser.add_option("--host", dest="host",
                      help="hostname of machine to backup",
                      metavar="HOST")
    parser.add_option("-n", "--name", dest="name",
                      help="name to use for this backup, defaults to HOST",
                      metavar="NAME")
    parser.add_option("-e", "--exclude-file", dest="excludefile",
                      help="rsync exclude file",
                      metavar="EXCLUDEFILE")
    parser.add_option("--version", action="store_true", dest="version",
                      default=False, help="print the version and exit")
    parser.add_option("-v", "--verbose", action="store_true", dest="verbose",
                      default=False, help="Pass the verbose option to rsync")

    (option, args) = parser.parse_args()

    if option.version:
        sys.stdout.write("rsync-backup version "+Version+".\n")
        sys.exit(0)

    if not option.dir or not option.host or not option.excludefile:
        sys.stderr.write("Error: --directory, --host, and --exclude-file are required.\n")
        parser.print_help()
        sys.exit(1)

    if not os.path.isdir(option.dir):
        sys.stderr.write("Error: " + option.dir + " does not exist or is not a directory.\n")
        sys.exit(1)
    if not os.path.isfile(option.excludefile):
        sys.stderr.write("Error: " + option.excludefile + " does not exist or is not a regular file.\n")
        sys.exit(1)


    ## look for a directory to hard link identical files to
    seedRegEx = re.compile("^" + option.name + "-\d\d\d\d-\d\d-\d\d$")
    possibleSeeds = []
    for file in os.listdir(option.dir):
        m = seedRegEx.match(file)
        if m and os.path.isdir(os.path.join(option.dir, file)):
            possibleSeeds.append(file)

    if possibleSeeds:
        possibleSeeds.sort()
        newestSeed = possibleSeeds[-1]
        linkdest = "--link-dest " + os.path.join(option.dir, newestSeed) + " "
    else:
        linkdest = ""

    date = datetime.date.today().isoformat()

    if option.verbose:
        verbose = "v"
    else:
        verbose = ""

    rsyncCmd = "rsync -a" + verbose + "zSH --numeric-ids --partial -e ssh --delete --delete-excluded --exclude-from " + option.excludefile + " root@" + option.host + ":/ " + linkdest + os.path.join(option.dir, option.name + "-" + date)

    sys.stdout.write("Running " + rsyncCmd + "...\n")
    os.system(rsyncCmd)