WIP
This commit is contained in:
Edwin Eefting
428
zfs_autobackup
428
zfs_autobackup
@ -23,13 +23,19 @@ def debug(txt):
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print(txt)
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print(txt)
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class Node(Object):
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class ZfsNode:
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"""an endpoint that contains zfs filesystems. can be local or remote"""
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"""an endpoint that contains zfs filesystems.
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def __init__(self, ssh_to='local'):
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contains lowlevel zfs wrappers for actual zfs commands on remote nodes via ssh (or local)
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self.backup_name=backup_name
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methods only accept and return simple dataset names, just like the real commands
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"""
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def __init__(self, ssh_to):
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"""ssh_to: server you want to ssh to. specify 'local' to just use local commands without ssh"""
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self.ssh_to=ssh_to
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self.ssh_to=ssh_to
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def run(cmd, input=None, tab_split=False, valid_exitcodes=[ 0 ], test=False):
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def run(cmd, input=None, tab_split=False, valid_exitcodes=[ 0 ], test=False):
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"""run a command on the node"""
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"""run a command on the node"""
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@ -87,7 +93,10 @@ class Node(Object):
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def zfs_get_selected_filesystems():
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def zfs_get_selected_filesystems():
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"""determine filesystems that should be backupped by looking at the special autobackup-property"""
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"""determine filesystems that should be backupped by looking at the special autobackup-property
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return: list with dataset names
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"""
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#get all source filesystems that have the backup property
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#get all source filesystems that have the backup property
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source_filesystems=self.run(tab_split=True, cmd=[
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source_filesystems=self.run(tab_split=True, cmd=[
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@ -171,225 +180,270 @@ class Node(Object):
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#in testmode we dont actually make changes, so keep them in a list to simulate
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#in testmode we dont actually make changes, so keep them in a list to simulate
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if args.test:
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if args.test:
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if not ssh_to in test_snapshots:
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if not filesystem in test_snapshots:
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test_snapshots[ssh_to]={}
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test_snapshots[filesystem]=[]
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if not filesystem in test_snapshots[ssh_to]:
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test_snapshots[filesystem].append(snapshot)
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test_snapshots[ssh_to][filesystem]=[]
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test_snapshots[ssh_to][filesystem].append(snapshot)
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run(ssh_to=ssh_to, tab_split=False, cmd=cmd, test=args.test)
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run(ssh_to=ssh_to, tab_split=False, cmd=cmd, test=args.test)
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"""get names of all snapshots for specified filesystems belonging to backup_name
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def zfs_get_snapshots(filesystems):
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"""get names of all snapshots for specified filesystems belonging to backup_name
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return[filesystem_name]=[ "snashot1", "snapshot2", ... ]
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return[filesystem_name]=[ "snashot1", "snapshot2", ... ]
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"""
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"""
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def zfs_get_snapshots(ssh_to, filesystems, backup_name):
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ret={}
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ret={}
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if filesystems:
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if filesystems:
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#TODO: get rid of ugly errors for non-existing target filesystems
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#TODO: get rid of ugly errors for non-existing target filesystems
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cmd=[
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cmd=[
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"zfs", "list", "-d", "1", "-r", "-t" ,"snapshot", "-H", "-o", "name"
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"zfs", "list", "-d", "1", "-r", "-t" ,"snapshot", "-H", "-o", "name"
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]
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]
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cmd.extend(filesystems)
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cmd.extend(filesystems)
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snapshots=run(ssh_to=ssh_to, tab_split=False, cmd=cmd, valid_exitcodes=[ 0,1 ])
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snapshots=run(ssh_to=ssh_to, tab_split=False, cmd=cmd, valid_exitcodes=[ 0,1 ])
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for snapshot in snapshots:
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for snapshot in snapshots:
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(filesystem, snapshot_name)=snapshot.split("@")
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(filesystem, snapshot_name)=snapshot.split("@")
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if re.match("^"+backup_name+"-[0-9]*$", snapshot_name):
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if re.match("^"+backup_name+"-[0-9]*$", snapshot_name):
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if not filesystem in ret:
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if not filesystem in ret:
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ret[filesystem]=[]
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ret[filesystem]=[]
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ret[filesystem].append(snapshot_name)
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ret[filesystem].append(snapshot_name)
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#also add any test-snapshots that where created with --test mode
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#also add any test-snapshots that where created with --test mode
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if args.test:
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if args.test:
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if ssh_to in test_snapshots:
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if ssh_to in test_snapshots:
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for filesystem in filesystems:
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for filesystem in filesystems:
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if filesystem in test_snapshots[ssh_to]:
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if filesystem in test_snapshots[ssh_to]:
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if not filesystem in ret:
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if not filesystem in ret:
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ret[filesystem]=[]
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ret[filesystem]=[]
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ret[filesystem].extend(test_snapshots[ssh_to][filesystem])
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ret[filesystem].extend(test_snapshots[ssh_to][filesystem])
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return(ret)
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return(ret)
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"""transfer a zfs snapshot from source to target. both can be either local or via ssh.
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"""transfer a zfs snapshot from source to target. both can be either local or via ssh.
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TODO:
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TODO:
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buffering: specify buffer_size to use mbuffer (or alike) to apply buffering where neccesary
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buffering: specify buffer_size to use mbuffer (or alike) to apply buffering where neccesary
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local to local:
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local to local:
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local send -> local buffer -> local receive
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local send -> local buffer -> local receive
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local to remote and remote to local:
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local to remote and remote to local:
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local send -> local buffer -> ssh -> remote buffer -> remote receive
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local send -> local buffer -> ssh -> remote buffer -> remote receive
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remote send -> remote buffer -> ssh -> local buffer -> local receive
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remote send -> remote buffer -> ssh -> local buffer -> local receive
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remote to remote:
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remote to remote:
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remote send -> remote buffer -> ssh -> local buffer -> ssh -> remote buffer -> remote receive
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remote send -> remote buffer -> ssh -> local buffer -> ssh -> remote buffer -> remote receive
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TODO: can we string together all the zfs sends and recvs, so that we only need to use 1 ssh connection? should be faster if there are many small snaphots
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TODO: can we string together all the zfs sends and recvs, so that we only need to use 1 ssh connection? should be faster if there are many small snaphots
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"""
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"""
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def zfs_transfer(ssh_source, source_filesystem, first_snapshot, second_snapshot,
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def zfs_transfer(ssh_source, source_filesystem, first_snapshot, second_snapshot,
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ssh_target, target_filesystem, resume_token=None, buffer_size=None):
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ssh_target, target_filesystem, resume_token=None, buffer_size=None):
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#### build source command
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#### build source command
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source_cmd=[]
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source_cmd=[]
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if ssh_source != "local":
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source_cmd.extend([ "ssh", ssh_source ])
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if args.ssh_cipher:
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source_cmd.extend(["-c", args.ssh_cipher])
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if args.compress:
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source_cmd.append("-C")
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source_cmd.extend(["zfs", "send", ])
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#only verbose in debug mode, lots of output
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if args.debug:
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source_cmd.append("-v")
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if not first_snapshot:
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txt="Initial transfer of "+source_filesystem+" snapshot "+second_snapshot
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else:
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txt="Incremental transfer of "+source_filesystem+" between snapshots "+first_snapshot+"..."+second_snapshot
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if resume_token:
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source_cmd.extend([ "-t", resume_token ])
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verbose("RESUMING "+txt)
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else:
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source_cmd.append("-p")
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if first_snapshot:
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source_cmd.extend([ "-i", first_snapshot ])
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if ssh_source != "local":
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if ssh_source != "local":
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source_cmd.append("'" + source_filesystem + "@" + second_snapshot + "'")
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source_cmd.extend([ "ssh", ssh_source ])
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if args.ssh_cipher:
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source_cmd.extend(["-c", args.ssh_cipher])
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if args.compress:
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source_cmd.append("-C")
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source_cmd.extend(["zfs", "send", ])
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#only verbose in debug mode, lots of output
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if args.debug:
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source_cmd.append("-v")
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if not first_snapshot:
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txt="Initial transfer of "+source_filesystem+" snapshot "+second_snapshot
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else:
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else:
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source_cmd.append(source_filesystem + "@" + second_snapshot)
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txt="Incremental transfer of "+source_filesystem+" between snapshots "+first_snapshot+"..."+second_snapshot
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verbose(txt)
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if resume_token:
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source_cmd.extend([ "-t", resume_token ])
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verbose("RESUMING "+txt)
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#### build target command
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else:
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target_cmd=[]
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source_cmd.append("-p")
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if ssh_target != "local":
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if first_snapshot:
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target_cmd.extend([ "ssh", ssh_target ])
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source_cmd.extend([ "-i", first_snapshot ])
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if args.ssh_cipher:
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target_cmd.extend(["-c", args.ssh_cipher])
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if args.compress:
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target_cmd.append("-C")
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target_cmd.extend(["zfs", "recv", "-u" ])
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if ssh_source != "local":
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source_cmd.append("'" + source_filesystem + "@" + second_snapshot + "'")
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#also verbose in --verbose mode so we can see the transfer speed when its completed
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if args.verbose or args.debug:
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target_cmd.append("-v")
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if args.resume:
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target_cmd.append("-s")
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if ssh_target!="local":
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target_cmd.append("'" + target_filesystem + "'")
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else:
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target_cmd.append(target_filesystem)
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#### make sure parent on target exists
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parent_filesystem= "/".join(target_filesystem.split("/")[:-1])
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run(ssh_to=ssh_target, cmd=[ "zfs", "create" ,"-p", parent_filesystem ], test=args.test)
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### execute pipe
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debug_txt="# "+source_cmd[0]+" '"+("' '".join(source_cmd[1:]))+"'" + " | " + target_cmd[0]+" '"+("' '".join(target_cmd[1:]))+"'"
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if args.test:
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debug("[TEST] "+debug_txt)
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return
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else:
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debug(debug_txt)
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source_proc=subprocess.Popen(source_cmd, env=os.environ, stdout=subprocess.PIPE)
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target_proc=subprocess.Popen(target_cmd, env=os.environ, stdin=source_proc.stdout)
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source_proc.stdout.close() # Allow p1 to receive a SIGPIPE if p2 exits.
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target_proc.communicate()
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if source_proc.returncode:
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raise(subprocess.CalledProcessError(source_proc.returncode, source_cmd))
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#zfs recv sometimes gives an exitcode 1 while the transfer was succesfull, therefore we ignore exit 1's and do an extra check to see if the snapshot is there.
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if target_proc.returncode and target_proc.returncode!=1:
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raise(subprocess.CalledProcessError(target_proc.returncode, target_cmd))
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debug("Verifying if snapshot exists on target")
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run(ssh_to=ssh_target, cmd=["zfs", "list", target_filesystem+"@"+second_snapshot ])
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"""get filesystems that where already backupped to a target. """
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def zfs_get_backupped_filesystems(ssh_to, backup_name, target_fs):
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#get all target filesystems that have received or inherited the backup propert, under the target_fs tree
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ret=run(ssh_to=ssh_to, tab_split=False, cmd=[
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"zfs", "get", "-r", "-t", "volume,filesystem", "-o", "name", "-s", "received,inherited", "-H", "autobackup:"+backup_name, target_fs
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])
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return(ret)
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"""get filesystems that where once backupped to target but are no longer selected on source
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these are filesystems that are not in the list in target_filesystems.
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this happens when filesystems are destroyed or unselected on the source.
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"""
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def get_stale_backupped_filesystems(ssh_to, backup_name, target_fs, target_filesystems):
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backupped_filesystems=zfs_get_backupped_filesystems(ssh_to=ssh_to, backup_name=backup_name, target_fs=target_fs)
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#determine backupped filesystems that are not in target_filesystems anymore
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stale_backupped_filesystems=[]
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for backupped_filesystem in backupped_filesystems:
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if backupped_filesystem not in target_filesystems:
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stale_backupped_filesystems.append(backupped_filesystem)
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return(stale_backupped_filesystems)
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now=time.time()
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"""determine list of snapshot (in @format) to destroy, according to age"""
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def determine_destroy_list(snapshots, days):
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ret=[]
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for filesystem in snapshots:
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for snapshot in snapshots[filesystem]:
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time_str=re.findall("^.*-([0-9]*)$", snapshot)[0]
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if len(time_str)==14:
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#new format:
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time_secs=time.mktime(time.strptime(time_str,"%Y%m%d%H%M%S"))
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else:
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else:
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time_secs=int(time_str)
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source_cmd.append(source_filesystem + "@" + second_snapshot)
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# verbose("time_secs"+time_str)
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if (now-time_secs) > (24 * 3600 * days):
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ret.append(filesystem+"@"+snapshot)
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return(ret)
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verbose(txt)
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#### build target command
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target_cmd=[]
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if ssh_target != "local":
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target_cmd.extend([ "ssh", ssh_target ])
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if args.ssh_cipher:
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target_cmd.extend(["-c", args.ssh_cipher])
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if args.compress:
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target_cmd.append("-C")
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target_cmd.extend(["zfs", "recv", "-u" ])
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#also verbose in --verbose mode so we can see the transfer speed when its completed
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if args.verbose or args.debug:
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target_cmd.append("-v")
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if args.resume:
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target_cmd.append("-s")
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def lstrip_path(path, count):
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if ssh_target!="local":
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return("/".join(path.split("/")[count:]))
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target_cmd.append("'" + target_filesystem + "'")
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else:
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target_cmd.append(target_filesystem)
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#### make sure parent on target exists
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parent_filesystem= "/".join(target_filesystem.split("/")[:-1])
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run(ssh_to=ssh_target, cmd=[ "zfs", "create" ,"-p", parent_filesystem ], test=args.test)
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### execute pipe
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debug_txt="# "+source_cmd[0]+" '"+("' '".join(source_cmd[1:]))+"'" + " | " + target_cmd[0]+" '"+("' '".join(target_cmd[1:]))+"'"
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if args.test:
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debug("[TEST] "+debug_txt)
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return
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else:
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debug(debug_txt)
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source_proc=subprocess.Popen(source_cmd, env=os.environ, stdout=subprocess.PIPE)
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target_proc=subprocess.Popen(target_cmd, env=os.environ, stdin=source_proc.stdout)
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source_proc.stdout.close() # Allow p1 to receive a SIGPIPE if p2 exits.
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target_proc.communicate()
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if source_proc.returncode:
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raise(subprocess.CalledProcessError(source_proc.returncode, source_cmd))
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#zfs recv sometimes gives an exitcode 1 while the transfer was succesfull, therefore we ignore exit 1's and do an extra check to see if the snapshot is there.
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if target_proc.returncode and target_proc.returncode!=1:
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raise(subprocess.CalledProcessError(target_proc.returncode, target_cmd))
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debug("Verifying if snapshot exists on target")
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run(ssh_to=ssh_target, cmd=["zfs", "list", target_filesystem+"@"+second_snapshot ])
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||||||
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|
||||||
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"""get filesystems that where already backupped to a target. """
|
||||||
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def zfs_get_backupped_filesystems(ssh_to, backup_name, target_fs):
|
||||||
|
#get all target filesystems that have received or inherited the backup propert, under the target_fs tree
|
||||||
|
ret=run(ssh_to=ssh_to, tab_split=False, cmd=[
|
||||||
|
"zfs", "get", "-r", "-t", "volume,filesystem", "-o", "name", "-s", "received,inherited", "-H", "autobackup:"+backup_name, target_fs
|
||||||
|
])
|
||||||
|
|
||||||
|
return(ret)
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
"""get filesystems that where once backupped to target but are no longer selected on source
|
||||||
|
|
||||||
|
these are filesystems that are not in the list in target_filesystems.
|
||||||
|
|
||||||
|
this happens when filesystems are destroyed or unselected on the source.
|
||||||
|
"""
|
||||||
|
def get_stale_backupped_filesystems(ssh_to, backup_name, target_fs, target_filesystems):
|
||||||
|
|
||||||
|
backupped_filesystems=zfs_get_backupped_filesystems(ssh_to=ssh_to, backup_name=backup_name, target_fs=target_fs)
|
||||||
|
|
||||||
|
#determine backupped filesystems that are not in target_filesystems anymore
|
||||||
|
stale_backupped_filesystems=[]
|
||||||
|
for backupped_filesystem in backupped_filesystems:
|
||||||
|
if backupped_filesystem not in target_filesystems:
|
||||||
|
stale_backupped_filesystems.append(backupped_filesystem)
|
||||||
|
|
||||||
|
return(stale_backupped_filesystems)
|
||||||
|
|
||||||
|
|
||||||
|
now=time.time()
|
||||||
|
"""determine list of snapshot (in @format) to destroy, according to age"""
|
||||||
|
def determine_destroy_list(snapshots, days):
|
||||||
|
ret=[]
|
||||||
|
for filesystem in snapshots:
|
||||||
|
for snapshot in snapshots[filesystem]:
|
||||||
|
time_str=re.findall("^.*-([0-9]*)$", snapshot)[0]
|
||||||
|
if len(time_str)==14:
|
||||||
|
#new format:
|
||||||
|
time_secs=time.mktime(time.strptime(time_str,"%Y%m%d%H%M%S"))
|
||||||
|
else:
|
||||||
|
time_secs=int(time_str)
|
||||||
|
# verbose("time_secs"+time_str)
|
||||||
|
if (now-time_secs) > (24 * 3600 * days):
|
||||||
|
ret.append(filesystem+"@"+snapshot)
|
||||||
|
|
||||||
|
return(ret)
|
||||||
|
|
||||||
|
|
||||||
|
def lstrip_path(path, count):
|
||||||
|
return("/".join(path.split("/")[count:]))
|
||||||
|
|
||||||
|
|
||||||
|
class ZfsDataset:
|
||||||
|
"""a generic zfs dataset"""
|
||||||
|
|
||||||
|
def __init__(name, parent, backup=false, created=false):
|
||||||
|
""" backup: should be backupped by zfs_autobackup
|
||||||
|
created: is created by zfs_autobackup (and may be destroyed by it as well)
|
||||||
|
parent: parent dataset this belongs to (none is "root")
|
||||||
|
|
||||||
|
"""
|
||||||
|
self.name=name
|
||||||
|
self.parent=parent
|
||||||
|
self.created=created
|
||||||
|
self.backup=backup
|
||||||
|
|
||||||
|
self.childs={}
|
||||||
|
|
||||||
|
|
||||||
|
class ZfsSnapshot(Dataset):
|
||||||
|
"""A zfs snapshot"""
|
||||||
|
def __init__(previous_snapshot=false, next_snapshot=fase, keep_time=false, timestamp=false, **kwargs, *args):
|
||||||
|
super.__init__(**kargs, *args)
|
||||||
|
self.timestamp
|
||||||
|
self.keep_time
|
||||||
|
self.previous_snapshot
|
||||||
|
self.next_snapshot
|
||||||
|
|
||||||
|
|
||||||
|
class ZfsBackupSource():
|
||||||
|
"""backup source.
|
||||||
|
|
||||||
|
contains high level backup source functions.
|
||||||
|
|
||||||
|
these work with ZfsDataset and ZfsSnapshot objects.
|
||||||
|
|
||||||
|
"""
|
||||||
|
|
||||||
|
def __init__(self):
|
||||||
|
self.node=ZfsNode(ssh_to=args.ssh_to)
|
||||||
|
self.datasets={}
|
||||||
|
self.snapshots={}
|
||||||
|
|
||||||
|
|
||||||
|
def refresh():
|
||||||
|
"""refresh all data by calling various zfs commands"""
|
||||||
|
selected_filesystems=self.node.zfs_get_selected_filesystems()
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|||||||
Reference in New Issue
Block a user