bundles/zfs: import bundle from work repository

bundles/zfs/files/check_zfs_old_snapshots

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+
+from datetime import datetime, timedelta
+from re import match
+from subprocess import check_output
+from sys import exit
+
+output = check_output(['zfs', 'get', 'creation', '-Hpr', '-t', 'snapshot'])
+
+now = int(datetime.now().timestamp())
+warn_age = now - (60 * 60 * 24 * 60)
+crit_age = now - (60 * 60 * 24 * 90)
+
+warn_snapshots = set()
+crit_snapshots = set()
+
+return_code = 0
+
+for line in output.decode('utf-8').split("\n"):
+    if line.strip() == '':
+        continue
+
+    items = line.split("\t")
+
+    # If the snapshot name contains 'zfs-auto-snap', it's probably
+    # really an automated snapshot and will be cleaned up eventually.
+    # This check only cares about manually created snapshots, though.
+    if 'zfs-auto-snap' in items[0]:
+        continue
+
+    # These are docker-internal snapshots and should not be touched by
+    # us.
+    if match(r'^tank/docker/[a-z0-9]+(-init)?@[0-9]+', items[0]):
+        continue
+
+    # line should be '<snapshot> creation <timestamp> -', separated by
+    # tabstops.
+    if len(items) < 3:
+        print('UNKNOWN - error while parsing ' + line)
+        exit(3)
+
+    creation_date = int(items[2])
+
+    if creation_date < crit_age:
+        crit_snapshots.add(items[0])
+    elif creation_date < warn_age:
+        warn_snapshots.add(items[0])
+
+# We have to do additional loops in here to have CRITICAL items on top.
+for snap in sorted(crit_snapshots):
+    print('CRITICAL - {} is older than 90 days'.format(snap))
+
+for snap in sorted(warn_snapshots):
+    print('WARN - {} is older than 60 days'.format(snap))
+
+if len(crit_snapshots) > 0:
+    return_code = 2
+elif len(warn_snapshots) > 0:
+    return_code = 1
+else:
+    print('OK - no snapshots are older than 60 days')
+
+exit(return_code)