Use cli = self approach

lib/mrsk/cli/app.rb

@@ -130,11 +130,13 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
     with_lock do
       stop = options[:stop]
 
+      cli = self
+
       on(MRSK.hosts) do |host|
         roles = MRSK.roles_on(host)
 
         roles.each do |role|
-          stale_versions(role: role).each do |version|
+          cli.stale_versions(host: host, role: role).each do |version|
             if stop
               puts_by_host host, "Stopping stale container for role #{role} with version #{version}"
               execute *MRSK.app(role: role).stop(version: version), raise_on_non_zero_exit: false
@@ -242,6 +244,17 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
     on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.current_running_version).strip }
   end
 
+  def stale_versions(host:, role:)
+    stale_versions = nil
+    on(host) do
+      stale_versions = \
+        capture_with_info(*MRSK.app(role: role).list_versions, raise_on_non_zero_exit: false)
+        .split("\n")
+        .drop(1)
+    end
+    stale_versions
+  end
+
   private
     def using_version(new_version)
       if new_version

lib/mrsk/sshkit_with_ext.rb

@@ -1,17 +1,7 @@
 require "sshkit"
 require "sshkit/dsl"
 
-module AppHelper
-  def stale_versions(role:)
-    capture_with_info(*MRSK.app(role: role).list_versions, raise_on_non_zero_exit: false)
-      .split("\n")
-      .drop(1)
-  end
-end
-
 class SSHKit::Backend::Abstract
-  include AppHelper
-
   def capture_with_info(*args, **kwargs)
     capture(*args, **kwargs, verbosity: Logger::INFO)
   end