author | Tero Marttila <terom@paivola.fi> |
Mon, 22 Apr 2013 00:36:23 +0300 | |
changeset 73 | 6cff0468e572 |
parent 70 | 3b1290aeed12 |
child 80 | b332d99f988e |
permissions | -rwxr-xr-x |
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#!/usr/bin/python |
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""" |
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SSH authorized_keys command="..." wrapper for rsync sender/server, with additional support for LVM snapshots. |
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Testing: |
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PYTHONPATH=. ./bin/pvl.backup-rsync -- -rlptx /etc/apache2 test/foo |
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sudo PYTHONPATH=. ./bin/pvl.backup-rsync --command 'rsync --server --sender -ax . lvm:asdf:test' -vD |
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sudo sh -c "PYTHONPATH=. rsync -e './bin/pvl.backup-rsync --debug -C --' -ax testing:lvm:asdf:test test/tmp" |
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""" |
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import pvl.args |
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from pvl.backup import __version__ |
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from pvl.backup.rsync import RSyncCommandFormatError |
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from pvl.backup.invoke import InvokeError |
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from pvl.backup import rsync, lvm |
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import optparse |
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import shlex |
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import os |
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import logging |
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log = logging.getLogger('main') |
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def parse_options (argv) : |
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""" |
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Parse command-line arguments. |
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""" |
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# import sys; sys.stderr.write("%s\n" % (argv, )) |
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parser = optparse.OptionParser( |
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prog = argv[0], |
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# module docstring |
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description = __doc__, |
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version = __version__, |
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) |
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# logging |
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parser.add_option_group(pvl.args.parser(parser)) |
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# |
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parser.add_option('-c', '--command', metavar='CMD', default=os.environ.get('SSH_ORIGINAL_COMMAND'), |
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help="Rsync command to execute") |
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parser.add_option('-C', '--given-command', action='store_true', default=False, |
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help="Use given command in `rsync -e '%prog -C --' ...` format") |
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parser.add_option('-n', '--noop', action='store_true', default=False, |
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help="Parse command, but do not execute") |
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parser.add_option('-R', '--readonly', action='store_true', default=False, |
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help="Restrict to read/source mode") |
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parser.add_option('-P', '--restrict-path', metavar='PATH', action='append', |
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help="Restrict to given path prefix") |
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parser.add_option('--allow-remote', action='store_true', default=False, |
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help="Allow remote rsync sources") |
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parser.add_option('--sudo', action='store_true', |
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help="Execute rsync under sudo") |
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# lvm options |
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parser.add_option('-L', '--snapshot-size', metavar='SIZE', default=lvm.LVM_SNAPSHOT_SIZE, |
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help="create snapshot with given LV size (used to store writes during backup)") |
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parser.add_option('--snapshot-wait', metavar='SECONDS', default=lvm.LVM_SNAPSHOT_WAIT, type='float', |
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help="wait for snapshot to settle after unmounting") |
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parser.add_option('--snapshot-retry', metavar='RETRY', default=lvm.LVM_SNAPSHOT_RETRY, type='int', |
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help="retry snapshot removal by given iterations") |
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# defaults |
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parser.set_defaults( |
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restrict_path = [], |
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) |
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# parse |
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options, args = parser.parse_args(argv[1:]) |
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# general logging/etc |
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pvl.args.apply(options) |
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return options, args |
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def rsync_wrapper (options, command, local=False) : |
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""" |
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Wrap given rsync command, parsing options/path, determining source, and running rsync in the source. |
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Parses the command, the source path, and then executes rsync within the source path (which may be a special |
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pseudo-path with additional handling). |
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local - the given command is a full local command, not an --server mode operation |
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""" |
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# parse the rsync command sent by the client |
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try : |
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# path = the real source path |
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rsync_cmd, rsync_options, path, srcdst = rsync.parse_command(command, |
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restrict_server = not local, |
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restrict_readonly = options.readonly, |
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) |
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except RSyncCommandFormatError, e: |
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log.error("invalid rsync command: %r: %s", command, e) |
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return 2 |
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# parse source |
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try : |
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# parse the source path as given by the client, may be a real path or pseudo-path |
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source = rsync.parse_source(path, |
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restrict_paths = options.restrict_path, |
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allow_remote = options.allow_remote, |
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lvm_opts = dict( |
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sudo = options.sudo, |
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size = options.snapshot_size, |
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wait = options.snapshot_wait, |
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retry = options.snapshot_retry, |
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), |
3 | 126 |
) |
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except RSyncCommandFormatError, e: |
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log.error("invalid rsync source: %r: %s", path, e) |
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return 2 |
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# noop? |
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if options.noop : |
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log.info("noop: %r -> %r: execute(%r, %r)", path, source, rsync_options, srcdst) |
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return 0 |
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# execute |
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try : |
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# run rsync within the source (may perform additional stuff like snapshot...) |
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source.execute(rsync_options, srcdst, |
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sudo = options.sudo, |
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) |
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except InvokeError, e: |
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log.error("%s failed: %d", e.cmd, e.exit) |
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return e.exit |
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147 |
||
148 |
# ok |
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return 0 |
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150 |
||
151 |
def main (argv) : |
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""" |
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Run, with full argv |
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""" |
3 | 155 |
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# global options + args |
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options, args = parse_options(argv) |
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158 |
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# was a local command, not remote? |
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local = False |
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161 |
|
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# from args (as given by `rsync -e pvlbackup-rsync-wrapper`) -> 'pvlbackup-rsync-wrapper <host> (<command> ...)' |
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if options.given_command : |
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host = args.pop(0) |
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command_parts = args |
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166 |
|
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log.debug("host=%r, using command from args: %r", host, command_parts) |
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168 |
|
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# from env/--command |
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elif options.command: |
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# as given |
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command_parts = shlex.split(options.command) |
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173 |
|
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174 |
# normal args |
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elif args : |
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command_parts = [argv[0]] + args |
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177 |
local = True |
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178 |
|
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log.debug("using given rsync args: %r", command_parts) |
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180 |
|
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181 |
else : |
3 | 182 |
log.error("SSH_ORIGINAL_COMMAND not given") |
183 |
return 2 |
|
184 |
||
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185 |
# run |
3 | 186 |
try : |
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187 |
return rsync_wrapper(options, command_parts, local=local) |
3 | 188 |
|
189 |
except Exception, e: |
|
190 |
log.error("Internal error:", exc_info=e) |
|
191 |
return 3 |
|
192 |
||
193 |
# ok |
|
194 |
return 0 |
|
0
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195 |
|
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196 |
if __name__ == '__main__' : |
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197 |
import sys |
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198 |
|
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199 |
sys.exit(main(sys.argv)) |
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200 |