Avoid using GNU-only Perl Regepx Grep

lib/mrsk/cli/app.rb

@@ -22,7 +22,7 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
                 execute *MRSK.app(role: role).rename_container(version: version, new_version: tmp_version)
               end
 
-              old_version = capture_with_info(*MRSK.app(role: role).current_running_version).strip
+              old_version = capture_with_info(*MRSK.app(role: role).current_running_version, raise_on_non_zero_exit: false).strip
               execute *MRSK.app(role: role).run
               sleep MRSK.config.readiness_delay
               execute *MRSK.app(role: role).stop(version: old_version), raise_on_non_zero_exit: false if old_version.present?
@@ -260,7 +260,7 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
 
     def list_versions(host:, role: nil, status: nil)
       versions = nil
-      on(host) { versions = capture_with_info(*MRSK.app(role: role).list_versions(status: status)).split("\n").map(&:strip) }
+      on(host) { versions = capture_with_info(*MRSK.app(role: role).list_versions(status: status), raise_on_non_zero_exit: false).split("\n").map(&:strip) }
       versions
     end
 

lib/mrsk/commands/app.rb

@@ -97,7 +97,8 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
   def list_versions(*docker_args, status: nil)
     pipe \
       docker(:ps, *filter_args(status: status), *docker_args, "--format", '"{{.Names}}"'),
-      %(grep -oP "(?<=\-)[^-]+$") # Extract SHA from "service-role-dest-SHA"
+      %(grep -oE "\\-[^-]+$"), # Extract SHA from "service-role-dest-SHA"
+      %(cut -c 2-)
   end
 
   def list_containers

lib/mrsk/sshkit_with_ext.rb

@@ -2,8 +2,8 @@ require "sshkit"
 require "sshkit/dsl"
 
 class SSHKit::Backend::Abstract
-  def capture_with_info(*args)
-    capture(*args, verbosity: Logger::INFO)
+  def capture_with_info(*args, **kwargs)
+    capture(*args, **kwargs, verbosity: Logger::INFO)
   end
 
   def puts_by_host(host, output, type: "App")