add x-initrd.attach option to crypttab if needed (bsc#1168465)

src/lib/y2storage/encryption.rb

@@ -336,8 +336,14 @@ def in_network?
 
     # Options that must be propagated from the fstab entries of the mount points
     # to the crypttab entries of the corresponding device
-    OPTIONS_TO_PROPAGATE = ["_netdev", "noauto", "nofail"]
-    private_constant :OPTIONS_TO_PROPAGATE
+    OPTIONS_TO_PROPAGATE = {
+      "_netdev"        => "_netdev",
+      "noauto"         => "noauto",
+      "nofail"         => "nofail",
+      "x-initrd.mount" => "x-initrd.attach"
+    }
+    ROOTFS_OPTIONS_TO_ADD = ["x-initrd.attach"]
+    private_constant :OPTIONS_TO_PROPAGATE, :ROOTFS_OPTIONS_TO_ADD
 
     # Synchronizes {#crypt_options} with the {MountPoint#mount_options} of the
     # mount points associated to this encryption device
@@ -349,8 +355,13 @@ def adjust_crypt_options
       # Moreover, libstorage-ng currently enforces that behavior.
       mount_points = descendants.select { |d| d.is?(:filesystem) }.map(&:mount_point).compact
 
-      OPTIONS_TO_PROPAGATE.each do |opt|
-        propagate_mount_option(opt, mount_points)
+      OPTIONS_TO_PROPAGATE.each_pair do |fstab_opt, crypttab_opt|
+        propagate_mount_option(fstab_opt, crypttab_opt, mount_points)
+      end
+
+      ROOTFS_OPTIONS_TO_ADD.each do |crypttab_opt|
+        is_rootfs = mount_points.any? { |m| m.path == "/" }
+        propagate_mount_option(nil, crypttab_opt, mount_points) if is_rootfs
       end
     end
 
@@ -405,14 +416,15 @@ def suitable_mount_bys
     # @param option [String] option from fstab and crypttab
     # @param mount_points [Array<MountPoint>] relevant mount points associated
     #   to the encryption device
-    def propagate_mount_option(option, mount_points)
-      in_mount_points = mount_points.all? { |mp| mp.mount_options.include?(option) }
-      in_encryption = crypt_options.include?(option)
+    def propagate_mount_option(fstab_option, crypttab_option, mount_points)
+      in_mount_points = fstab_option.nil? ||
+        mount_points.all? { |mp| mp.mount_options.include?(fstab_option) }
+      in_encryption = crypt_options.include?(crypttab_option)
 
       if in_mount_points && !in_encryption
-        self.crypt_options = crypt_options + [option]
+        self.crypt_options = crypt_options + [crypttab_option]
       elsif !in_mount_points && in_encryption
-        self.crypt_options = crypt_options - [option]
+        self.crypt_options = crypt_options - [crypttab_option]
       end
     end