bundles/zfs: fix dependencies, auto-load zfs module if not loaded

bundles/zfs/items.py

@@ -3,7 +3,24 @@ from os.path import join
 
 from bundlewrap.metadata import MetadataJSONEncoder
 
-actions = {}
+actions = {
+    # For some reason, this module doesn't get auto-loaded on debian,
+    # even if installation of zfsutils-linux tries to start
+    # zfs-mount.service. We have no choice but to do it manually.
+    'modprobe_zfs': {
+        'command': 'modprobe zfs',
+        'unless': 'lsmod | grep ^zfs',
+        'needs': {
+            'pkg_apt:zfs-dkms',
+        },
+        'needed_by': {
+            'pkg_apt:zfs-zed',
+            'pkg_apt:zfsutils-linux',
+            'zfs_dataset:',
+            'zfs_pool:',
+        },
+    },
+}
 
 files = {
     '/etc/modprobe.d/zfs.conf': {