Simple script to expire ZFS snapshots older than a certain age

svn path=/head/; revision=217602

Tools/portbuild/scripts/zexpire

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+#
+# Expire old snapshots
+
+import zfs, commands, datetime, os
+
+# List of filesystems to expire
+expirelist=(("a", 14), 
+            ("a/nfs", 14),
+            ("a/src", 14),
+            ("a/local", 14),
+            ("a/ports", 14),
+            ("a/portbuild", 14),
+            ("a/portbuild/amd64", 14),
+            ("a/portbuild/i386", 14),
+            ("a/portbuild/sparc64", 14),
+            ("a/portbuild/ia64", 14),
+            ("a/snap", 7),
+            ("a/snap/ports", 7),
+            ("a/snap/src-5", 7),
+            ("a/snap/src-6", 7),
+            ("a/snap/src-7", 7),
+            ("a/snap/src-HEAD", 7),
+            ("a/snap/world-amd64-HEAD", 7),
+            ("a/snap/world-i386-HEAD", 7))
+
+now = datetime.datetime.now()
+
+for (fs, maxage) in expirelist:
+    snapdata = zfs.getallsnaps(fs)
+    snaps = (i[0] for i in snapdata)
+
+    for snap in snaps:
+        try:
+            snapdate = datetime.datetime.strptime(snap, "%Y%m%d%H%M")
+        except ValueError:
+            try:
+                snapdate = datetime.datetime.strptime(snap, "%Y%m%d%H%M%S")
+            except ValueError:
+                continue
+
+        if (now - snapdate) > datetime.timedelta(days=maxage):
+            print "Snapshot %s@%s too old" % (fs, snap)
+            (err, out) = commands.getstatusoutput("zfs destroy %s@%s" % (fs,snap))
+
+            if err:
+                print "Error deleting snapshot", out