tests: zfs: add native zfs encryption tests

This primarily ensures that we correctly load the dataset keys when
importing a pool, and if we can't import the dataset that the storage
pool is correctly tagged as UNAVAILABLE.

Signed-off-by: Aleksa Sarai <[email protected]>

test/suites/storage_driver_zfs.sh

@@ -5,6 +5,7 @@ test_storage_driver_zfs() {
 
   do_zfs_cross_pool_copy
   do_zfs_delegate
+  do_zfs_encryption
 }
 
 do_zfs_delegate() {
@@ -45,6 +46,84 @@ do_zfs_delegate() {
   incus delete -f c1
 }
 
+do_zfs_encryption() {
+  # shellcheck disable=2039,3043
+  local INCUS_STORAGE_DIR incus_backend
+
+  incus_backend=$(storage_backend "$INCUS_DIR")
+  if [ "$incus_backend" != "zfs" ]; then
+    return
+  fi
+
+  if ! zfs --help | grep -q '^\s\+load-key\b'; then
+    echo "==> SKIP: Skipping ZFS encryption tests as installed version doesn't support it"
+    return
+  fi
+
+  INCUS_STORAGE_DIR="$(mktemp -d -p "${TEST_DIR}" XXXXXXXXX)"
+  chmod +x "${INCUS_STORAGE_DIR}"
+  spawn_incus "${INCUS_STORAGE_DIR}" false
+
+  # shellcheck disable=3043
+  local zpool_name zpool_keyfile zpool_vdev
+  # Create a new pool. incus storage create doesn't support setting up
+  # encrypted datasets, so we need to create the pool ourselves.
+  configure_loop_device zpool_file zpool_vdev
+  zpool_name="$(mktemp -u incus-zpool-XXXXXXXXX)"
+  zpool_keyfile="$(mktemp -p "${TEST_DIR}" incus-zpool-keyfile.XXXXXXXXX)"
+  echo "dummy-passphrase" >"$zpool_keyfile"
+
+  zpool create \
+    -O encryption=on \
+    -O keyformat=passphrase \
+    -O keylocation="file://$zpool_keyfile" \
+    "$zpool_name" "$zpool_vdev"
+
+  incus storage create zpool_encrypted zfs source="$zpool_name"
+
+  # Make sure that incus sees that the pool is imported.
+  zfs get -H -o name,property,value keystatus "$zpool_name" | grep -Eq "$zpool_name\s+keystatus\s+available"
+  incus storage list -f csv -c nDs | grep -q "zpool_encrypted,zfs,CREATED"
+
+  # Shut down Incus to force the pool to get exported. The shutdown needs to be
+  # clean for this test to work, so we wait for it to finish.
+  incus admin shutdown
+
+  # The pool should be exported now.
+  ! zpool status "$zpool_name" 2>/dev/null
+
+  # Restart Incus.
+  incus admin waitready
+
+  # The keys should've been re-imported automatically by Incus.
+  zfs get -H -o name,property,value keystatus "$zpool_name" | grep -Eq "$zpool_name\s+keystatus\s+available"
+  incus storage list -f csv -c nDs | grep -q "zpool_encrypted,zfs,CREATED"
+
+  # Now we reconfigure the dataset so that the encryption key is provided via
+  # an interactive prompt. Incus cannot handle this, so we should expect the
+  # pool to remain unimported and the storage pool should be reported as
+  # UNAVAILABLE.
+  zfs set keylocation=prompt "$zpool_name"
+
+  # Shut down Incus to force the pool to get exported. The shutdown needs to be
+  # clean for this test to work, so we wait for it to finish.
+  incus admin shutdown
+
+  # The pool should be exported now.
+  ! zpool status "$zpool_name" 2>/dev/null
+
+  # Restart Incus.
+  incus admin waitready
+
+  # The pool should still not be imported, and Incus should report the storage
+  # pool as UNAVAILABLE.
+  ! zpool status "$zpool_name" 2>/dev/null
+  incus storage list -f csv -c nDs | grep -q "zpool_encrypted,zfs,UNAVAILABLE"
+
+  # shellcheck disable=SC2031
+  kill_incus "${INCUS_STORAGE_DIR}"
+}
+
 do_zfs_cross_pool_copy() {
   # shellcheck disable=2039,3043
   local INCUS_STORAGE_DIR incus_backend