Trivial utils for managing snapshots

clear_snapshot

#!/usr/bin/python3

from os import listdir
from os.path import isdir
from dateutil.parser import parse as parse_time
from datetime import datetime, timedelta
from collections import namedtuple
import pytz
from subprocess import call

earlierthan = datetime.utcnow().replace(tzinfo=pytz.UTC) - timedelta(days=1)

for path in listdir("./"):
    if isdir(path):
        time, bootid, uptime = path.split("$")
        time = parse_time(time)
        if(time < earlierthan):
            call(["/sbin/btrfs", "subvol", "delete", path])

snapshot.service

[Unit]
Description=Create snapshot

[Service]
Type=oneshot
WorkingDirectory=/var/snapshots
ExecStart=/usr/local/bin/clear_snapshot
ExecStart=/usr/local/bin/take_snapshot %b

snapshot.timer

[Unit]
Description=Trigger snapshots

[Timer]
Persistent=true
OnBootSec=5min
OnUnitActiveSec=3h

[Install]
WantedBy=multi-user.target

take_snapshot

#!/bin/bash

/sbin/btrfs subvolume snapshot -r / /var/snapshots/"`date -Iseconds`\$$1\$`cat /proc/uptime | cut -d\  -f1`"