Dont build image if it has already been pushed

lib/kamal/cli/build.rb

@@ -5,7 +5,7 @@ class BuildError < StandardError; end
 
   desc "deliver", "Build app and push app image to registry then pull image on servers"
   def deliver
-    push
+    push unless pushed?
     pull
   end
 
@@ -157,4 +157,10 @@ def pull_on_hosts(hosts)
         execute *KAMAL.builder.validate_image
       end
     end
+
+    def pushed?
+      run_locally { execute *KAMAL.docker.manifest(KAMAL.builder.absolute_image) }
+    rescue SSHKit::Command::Failed
+      false
+    end
 end

lib/kamal/commands/builder.rb

@@ -2,7 +2,8 @@
 
 class Kamal::Commands::Builder < Kamal::Commands::Base
   delegate :create, :remove, :push, :clean, :pull, :info, :inspect_builder, :validate_image, :first_mirror, to: :target
-  delegate :local?, :remote?, to: "config.builder"
+  delegate :absolute_image, :builder, to: :config
+  delegate :local?, :remote?, to: :builder
 
   include Clone
 

lib/kamal/commands/docker.rb

@@ -14,6 +14,10 @@ def running?
     docker :version
   end
 
+  def manifest(tag)
+    docker :manifest, :inspect, tag
+  end
+
   # Do we have superuser access to install Docker and start system services?
   def superuser?
     [ '[ "${EUID:-$(id -u)}" -eq 0 ] || command -v sudo >/dev/null || command -v su >/dev/null' ]

test/integration/main_test.rb

@@ -2,7 +2,7 @@
 
 class MainTest < IntegrationTest
   test "deploy, redeploy, rollback, details and audit" do
-    first_version = latest_app_version
+    first_version = update_app_rev
 
     assert_app_is_down
 
@@ -38,7 +38,7 @@ class MainTest < IntegrationTest
   test "app with roles" do
     @app = "app_with_roles"
 
-    version = latest_app_version
+    version = update_app_rev
 
     assert_app_is_down