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58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
#!/usr/bin/env python3
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from datetime import datetime
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from json import load
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from subprocess import check_output
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from sys import argv, exit
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from time import time
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NODE = argv[1]
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ONE_BACKUP_EVERY_HOURS = int(argv[2])
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NOW = int(time())
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HOUR_SECONDS = 60 * 60
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snaps = set()
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try:
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with open(f'/etc/backup-server/config.json', 'r') as f:
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server_settings = load(f)
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# get all existing snapshots for NODE
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for line in check_output('LC_ALL=C zfs list -H -t snapshot -o name', shell=True).splitlines():
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line = line.decode('UTF-8')
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if line.startswith('{}/{}@'.format(server_settings['zfs-base'], NODE)):
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_, snapname = line.split('@', 1)
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if 'zfs-auto-snap' in snapname:
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# migration from auto-snapshots, ignore
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continue
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ts, bucket = snapname.split('-', 1)
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snaps.add(int(ts))
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if not snaps:
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print('No backups found!')
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exit(2)
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last_snap = sorted(snaps)[-1]
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delta = NOW - last_snap
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print('Last backup was on {} UTC'.format(
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datetime.fromtimestamp(last_snap).strftime('%Y-%m-%d %H:%M:%S'),
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))
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# One day without backups is still okay. There may be fluctuations
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# because of transfer speed, amount of data, changes in backup
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# schedule etc.
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if delta > ((HOUR_SECONDS * (ONE_BACKUP_EVERY_HOURS + 1)) + (HOUR_SECONDS*24)):
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exit(2)
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elif delta > (HOUR_SECONDS * (ONE_BACKUP_EVERY_HOURS + 1)):
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exit(1)
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else:
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exit(0)
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except Exception as e:
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print(repr(e))
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exit(3)
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