bundles/zfs: introduce zfs-snapshot-backups, enable backups for nodes which need zfs-snapshot-backups

bundles/zfs/files/backup-pre-hook

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -euo pipefail
+
+run-parts --exit-on-error -- /etc/zfs-snapshot-backup-pre.d
+
+
+% for dataset in sorted(node.metadata.get('zfs/filesystems_with_backup_snapshots')):
+if zfs get type ${dataset}@snapshot-backup >/dev/null 2>&1
+then
+    zfs destroy -f ${dataset}@snapshot-backup
+fi
+
+zfs snapshot ${dataset}@snapshot-backup
+
+mkdir -p /mnt/backup-snapshot${node.metadata['zfs']['datasets'][dataset]['mountpoint']}
+mount -t zfs ${dataset}@snapshot-backup /mnt/backup-snapshot${node.metadata['zfs']['datasets'][dataset]['mountpoint']}
+
+
+% endfor
+run-parts --exit-on-error -- /etc/zfs-snapshot-backup-post.d

bundles/zfs/items.py

@@ -95,7 +95,11 @@ directories = {
     "/etc/zfs-snapshot-backup-post.d": {
         'purge': True,
     },
-    "/etc/zfs-snapshot-backup-final.d": {
-        'purge': True,
-    },
 }
+
+if node.metadata.get('zfs/filesystems_with_backup_snapshots', {}) and node.has_bundle('backup-client'):
+    files['/etc/backup-pre-hooks.d/99-zfs-snapshots'] = {
+        'content_type': 'mako',
+        'source': 'backup-pre-hook',
+        'mode': '0755',
+    }

bundles/zfs/metadata.py

@@ -104,7 +104,9 @@ def zfs_scrub_cronjob(metadata):
     }
 
 
-@metadata_reactor
+@metadata_reactor.provides(
+    'icinga2_api/zfs/services',
+)
 def monitoring(metadata):
     if not node.has_bundle('sshmon'):
         raise DoNotRunAgain
@@ -129,3 +131,25 @@ def monitoring(metadata):
             },
         },
     }
+
+
+@metadata_reactor.provides(
+    'zfs/filesystems_with_backup_snapshots',
+)
+def backups_with_snapshot(metadata):
+    backups = metadata.get('backups/paths', set())
+    datasets = metadata.get('zfs/datasets', {})
+
+    backups_in_zfs_datasets = {}
+
+    for path in backups:
+        for dname, dconfig in datasets.items():
+            if 'mountpoint' in dconfig:
+                if path[:len(dconfig['mountpoint'])] == dconfig['mountpoint']:
+                    backups_in_zfs_datasets.setdefault(dname, set()).add(path)
+
+    return {
+        'zfs': {
+            'filesystems_with_backup_snapshots': backups_in_zfs_datasets,
+        },
+    }