58 lines
1.8 KiB
Text
58 lines
1.8 KiB
Text
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#!/usr/bin/env python3
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import re
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from datetime import datetime
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from json import loads
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from subprocess import check_call, check_output
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from sys import argv
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def create_snap_and_rotate(ds, label, retain, now, all_snapshots):
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new_snap = '{}@zfs-auto-snap_{}-{}'.format(ds, label, now)
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check_call(['zfs', 'snapshot', new_snap])
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prefix = '{}@zfs-auto-snap_{}-'.format(ds, label)
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my_candidates = []
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for i in sorted(all_snapshots):
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if i.startswith(prefix):
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my_candidates.append(i)
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my_candidates.append(new_snap)
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for i in my_candidates[:-retain]:
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assert '@' in i, 'BUG! Dataset "{}" has no @!'.format(i)
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check_call(['zfs', 'destroy', i])
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label = argv[1]
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with open('/etc/zfs-snapshot-config.json', 'r') as fp:
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metadata = loads(fp.read())
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if 'snapshot_only' in metadata:
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datasets = set(metadata['snapshot_only'])
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else:
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output = check_output(['zfs', 'list', '-H', '-o', 'name']).decode('UTF-8')
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datasets = set(output.splitlines())
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for pattern in metadata.get('snapshot_never', set()):
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datasets = set(filter(lambda x: not re.search(pattern, x), datasets))
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default_retain = metadata['retain_defaults'][label]
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now = datetime.now().strftime('%F-%H%M')
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snapshots_created = False
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if datasets:
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all_snapshots = check_output(['zfs', 'list', '-H', '-o', 'name', '-t', 'snap']).decode('UTF-8').splitlines()
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for ds in datasets:
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retain = int(metadata.get('retain_per_dataset', {}).get(ds, {}).get(label, default_retain))
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if retain > 0:
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create_snap_and_rotate(ds, label, retain, now, all_snapshots)
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snapshots_created = True
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with open('/var/tmp/zfs-auto-snapshot.status', 'w') as fp:
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fp.write('{}\n'.format(datetime.now().strftime('%s') if snapshots_created else 0))
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