author | Tero Marttila <terom@paivola.fi> |
Tue, 14 Feb 2012 21:51:30 +0200 | |
changeset 12 | fbfdde7326f4 |
parent 9 | c4c858043729 |
child 24 | 6bf4f5cc4479 |
permissions | -rw-r--r-- |
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""" |
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rsync handling. |
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Apologies for the 'RSync' nomenclature |
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""" |
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from pvl.backup.lvm import LVM, LVMVolume, LVMSnapshot |
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from pvl.backup.mount import mount |
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from pvl.backup import invoke |
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import shlex |
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import os.path |
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import logging |
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log = logging.getLogger('pvl.backup.rsync') |
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# Path to rsync binary |
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RSYNC = '/usr/bin/rsync' |
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def rsync (source, dest, **opts) : |
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""" |
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Run rsync. |
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""" |
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invoke.command(RSYNC, source, dest, **opts) |
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class RSyncCommandFormatError (Exception) : |
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""" |
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Improper rsync command |
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""" |
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pass |
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class RSyncServer (object) : |
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""" |
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rsync server-mode execution. |
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""" |
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def _execute (self, options, path) : |
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""" |
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Underlying rsync just reads from filesystem. |
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""" |
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# invoke directly, no option-handling, nor stdin/out redirection |
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invoke.invoke(RSYNC, options + ['.', path], data=False) |
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class RSyncFSServer (RSyncServer) : |
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""" |
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Normal filesystem backup. |
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""" |
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def __init__ (self, path) : |
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RSyncServer.__init__(self) |
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self.path = path |
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def execute (self, options) : |
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return self._execute(options, self.path) |
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class RSyncLVMServer (RSyncServer) : |
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""" |
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Backup LVM LV by snapshotting + mounting it. |
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""" |
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def __init__ (self, volume) : |
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RSyncServer.__init__(self) |
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self.volume = volume |
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def execute (self, options) : |
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""" |
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Snapshot, mount, execute |
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""" |
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# backup target from LVM command |
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lvm = self.volume.lvm |
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volume = self.volume |
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# XXX: generate |
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path = '/mnt' |
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# snapshot |
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log.info("Open snapshot...") |
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# XXX: generate snapshot nametag to be unique? |
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with lvm.snapshot(volume, tag='backup') as snapshot: |
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log.info("Snapshot opened: %s", snapshot.lvm_path) |
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# mount |
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log.info("Mounting snapshot: %s -> %s", snapshot, path) |
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with mount(snapshot.dev_path, path) as mountpoint: |
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log.info("Mounted snapshot: %s", mountpoint) |
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# rsync! |
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log.info("Running rsync: ...") |
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# with trailing slash |
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return self._execute(options, mountpoint.path + '/') |
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# cleanup |
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# cleanup |
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def parse_command (command, restrict_server=True, restrict_readonly=True) : |
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""" |
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Parse given rsync server command into bits. |
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command - the command-string sent by rsync |
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restrict_server - restrict to server-mode |
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restrict_readonly - restrict to read/send-mode |
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Returns: |
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(cmd, options, source, dest) |
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""" |
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# split |
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parts = shlex.split(command) |
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cmd = None |
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options = [] |
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source = None |
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dest = None |
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# parse |
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for part in parts : |
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if cmd is None : |
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cmd = part |
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|
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elif part.startswith('-') : |
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options.append(part) |
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133 |
|
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134 |
elif source is None : |
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135 |
source = part |
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136 |
|
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elif dest is None : |
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dest = part |
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139 |
|
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140 |
# options |
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have_server = ('--server' in options) |
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have_sender = ('--sender' in options) |
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143 |
|
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144 |
# verify |
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145 |
if not have_server : |
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raise RSyncCommandFormatError("Missing --server") |
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147 |
|
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148 |
if restrict_readonly and not have_sender : |
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raise RSyncCommandFormatError("Missing --sender for readonly") |
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150 |
|
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# parse path |
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152 |
if have_sender : |
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153 |
# read |
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# XXX: which way does the dot go? |
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155 |
if source != '.' : |
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raise RSyncCommandFormatError("Invalid dest for sender") |
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157 |
|
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158 |
path = dest |
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159 |
|
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160 |
else : |
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161 |
# write |
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162 |
if source != '.' : |
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163 |
raise RSyncCommandFormatError("Invalid source for reciever") |
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164 |
|
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165 |
path = dest |
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166 |
|
6 | 167 |
if not path : |
168 |
raise RSyncCommandFormatError("Missing path") |
|
169 |
||
5
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170 |
# ok |
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171 |
return cmd, options, source, dest |
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172 |
|
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173 |
|
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174 |
def parse_source (path, restrict_path=False) : |
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175 |
""" |
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Figure out source to rsync from, based on pseudo-path given in rsync command. |
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177 |
""" |
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178 |
|
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179 |
# normalize |
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180 |
path = os.path.normpath(path) |
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181 |
|
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182 |
# verify path |
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183 |
if restrict_path : |
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184 |
if not path.startswith(restrict_path) : |
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185 |
raise RSyncCommandFormatError("Restricted path ({restrict})".format(restrict=restrict_path)) |
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186 |
|
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187 |
if path.startswith('/') : |
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188 |
# direct filesystem path |
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189 |
# XXX: how to handle= |
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190 |
log.info("filesystem: %s", path) |
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191 |
|
12
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192 |
return RSyncFSServer(path) |
5
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193 |
|
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194 |
elif path.startswith('lvm:') : |
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195 |
# LVM LV |
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196 |
try : |
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197 |
lvm, vg, lv = path.split(':') |
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198 |
|
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199 |
except ValueError, e: |
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200 |
raise RSyncCommandFormatError("Invalid lvm pseudo-path: {error}".format(error=e)) |
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201 |
|
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202 |
# XXX: validate |
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203 |
|
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204 |
log.info("LVM: %s/%s", vg, lv) |
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205 |
|
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206 |
# open |
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207 |
lvm = LVM(vg) |
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208 |
volume = lvm.volume(lv) |
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209 |
|
12
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210 |
return RSyncLVMServer(volume) |
5
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|
211 |
|
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|
212 |
else : |
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213 |
# invalid |
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214 |
raise RSyncCommandFormatError("Unrecognized backup path") |
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|
215 |