packer: Build runs the post-processors

packer/artifact_test.go

+package packer
+
+type TestArtifact struct{}
+
+func (*TestArtifact) BuilderId() string {
+	return "bid"
+}
+
+func (*TestArtifact) Files() []string {
+	return []string{"a", "b"}
+}
+
+func (*TestArtifact) Id() string {
+	return "id"
+}
+
+func (*TestArtifact) String() string {
+	return "string"
+}

packer/build.go

 package packer
 
 import (
+	"fmt"
 	"log"
 	"sync"
 )
@@ -151,10 +152,36 @@ func (b *coreBuild) Run(ui Ui, cache Cache) ([]Artifact, error) {
 	hook := &DispatchHook{hooks}
 	artifacts := make([]Artifact, 0, 1)
 
-	artifact, err := b.builder.Run(ui, hook, cache)
-	if artifact != nil {
+	builderArtifact, err := b.builder.Run(ui, hook, cache)
+	if builderArtifact != nil {
+		artifacts = append(artifacts, builderArtifact)
+	}
+
+	if err != nil {
+		return artifacts, err
+	}
+
+	errors := make([]error, 0)
+
+	// Run the post-processors
+PostProcessorRunSeqLoop:
+	for _, ppSeq := range b.postProcessors {
+		artifact := builderArtifact
+		for _, corePP := range ppSeq {
+			var err error
+			artifact, err = corePP.processor.PostProcess(artifact)
+			if err != nil {
+				errors = append(errors, fmt.Errorf("Post-processor failed: %s", err))
+				continue PostProcessorRunSeqLoop
+			}
+
 			artifacts = append(artifacts, artifact)
 		}
+	}
+
+	if len(errors) > 0 {
+		err = &MultiError{errors}
+	}
 
 	return artifacts, err
 }

packer/build_test.go

@@ -107,7 +107,9 @@ func TestBuild_Run(t *testing.T) {
 
 	build := testBuild()
 	build.Prepare()
-	build.Run(ui, cache)
+	artifacts, err := build.Run(ui, cache)
+	assert.Nil(err, "should not error")
+	assert.Equal(len(artifacts), 2, "should have two artifacts")
 
 	coreB := build.(*coreBuild)
 
@@ -128,6 +130,10 @@ func TestBuild_Run(t *testing.T) {
 	dispatchHook.Run(HookProvision, nil, nil, 42)
 	prov := coreB.provisioners[0].provisioner.(*TestProvisioner)
 	assert.True(prov.provCalled, "provision should be called")
+
+	// Verify post-processor was run
+	pp := coreB.postProcessors[0][0].processor.(*TestPostProcessor)
+	assert.True(pp.ppCalled, "post processor should be called")
 }
 
 func TestBuild_RunBeforePrepare(t *testing.T) {

packer/builder_test.go

@@ -21,7 +21,7 @@ func (tb *TestBuilder) Run(ui Ui, h Hook, c Cache) (Artifact, error) {
 	tb.runHook = h
 	tb.runUi = ui
 	tb.runCache = c
-	return nil, nil
+	return new(TestArtifact), nil
 }
 
 func (tb *TestBuilder) Cancel() {