template: parse post-processors

template/parse.go

@@ -17,11 +17,11 @@ type rawTemplate struct {
 	MinVersion  string `mapstructure:"min_packer_version"`
 	Description string
 
-	Builders      []map[string]interface{}
-	Push          map[string]interface{}
-	PostProcesors []interface{} `mapstructure:"post-processors"`
-	Provisioners  []map[string]interface{}
-	Variables     map[string]interface{}
+	Builders       []map[string]interface{}
+	Push           map[string]interface{}
+	PostProcessors []interface{} `mapstructure:"post-processors"`
+	Provisioners   []map[string]interface{}
+	Variables      map[string]interface{}
 }
 
 // Template returns the actual Template object built from this raw
@@ -94,6 +94,49 @@ func (r *rawTemplate) Template() (*Template, error) {
 		result.Builders[b.Name] = &b
 	}
 
+	// Gather all the post-processors
+	if len(r.PostProcessors) > 0 {
+		result.PostProcessors = make([][]*PostProcessor, 0, len(r.PostProcessors))
+	}
+	for i, v := range r.PostProcessors {
+		// Parse the configurations. We need to do this because post-processors
+		// can take three different formats.
+		configs, err := r.parsePostProcessor(i, v)
+		if err != nil {
+			errs = multierror.Append(errs, err)
+			continue
+		}
+
+		// Parse the PostProcessors out of the configs
+		pps := make([]*PostProcessor, 0, len(configs))
+		for j, c := range configs {
+			var pp PostProcessor
+			if err := r.decoder(&pp, nil).Decode(c); err != nil {
+				errs = multierror.Append(errs, fmt.Errorf(
+					"post-processor %d.%d: %s", i+1, j+1, err))
+				continue
+			}
+
+			// Type is required
+			if pp.Type == "" {
+				errs = multierror.Append(errs, fmt.Errorf(
+					"post-processor %d.%d: type is required", i+1, j+1))
+				continue
+			}
+
+			// Set the configuration
+			delete(c, "keep_input_artifact")
+			delete(c, "type")
+			if len(c) > 0 {
+				pp.Config = c
+			}
+
+			pps = append(pps, &pp)
+		}
+
+		result.PostProcessors = append(result.PostProcessors, pps)
+	}
+
 	// Gather all the provisioners
 	if len(r.Provisioners) > 0 {
 		result.Provisioners = make([]*Provisioner, 0, len(r.Provisioners))
@@ -152,6 +195,45 @@ func (r *rawTemplate) decoder(
 	return d
 }
 
+func (r *rawTemplate) parsePostProcessor(
+	i int, raw interface{}) ([]map[string]interface{}, error) {
+	switch v := raw.(type) {
+	case string:
+		return []map[string]interface{}{
+			{"type": v},
+		}, nil
+	case map[string]interface{}:
+		return []map[string]interface{}{v}, nil
+	case []interface{}:
+		var err error
+		result := make([]map[string]interface{}, len(v))
+		for j, innerRaw := range v {
+			switch innerV := innerRaw.(type) {
+			case string:
+				result[j] = map[string]interface{}{"type": innerV}
+			case map[string]interface{}:
+				result[j] = innerV
+			case []interface{}:
+				err = multierror.Append(err, fmt.Errorf(
+					"post-processor %d.%d: sequence not allowed to be nested in a sequence",
+					i+1, j+1))
+			default:
+				err = multierror.Append(err, fmt.Errorf(
+					"post-processor %d.%d: unknown format",
+					i+1, j+1))
+			}
+		}
+
+		if err != nil {
+			return nil, err
+		}
+
+		return result, nil
+	default:
+		return nil, fmt.Errorf("post-processor %d: bad format", i+1)
+	}
+}
+
 // Parse takes the given io.Reader and parses a Template object out of it.
 func Parse(r io.Reader) (*Template, error) {
 	// First, decode the object into an interface{}. We do this instead of

template/parse_test.go

@@ -141,6 +141,108 @@ func TestParse(t *testing.T) {
 			},
 			false,
 		},
+
+		{
+			"parse-pp-basic.json",
+			&Template{
+				PostProcessors: [][]*PostProcessor{
+					[]*PostProcessor{
+						&PostProcessor{
+							Type: "foo",
+							Config: map[string]interface{}{
+								"foo": "bar",
+							},
+						},
+					},
+				},
+			},
+			false,
+		},
+
+		{
+			"parse-pp-keep.json",
+			&Template{
+				PostProcessors: [][]*PostProcessor{
+					[]*PostProcessor{
+						&PostProcessor{
+							Type:              "foo",
+							KeepInputArtifact: true,
+						},
+					},
+				},
+			},
+			false,
+		},
+
+		{
+			"parse-pp-string.json",
+			&Template{
+				PostProcessors: [][]*PostProcessor{
+					[]*PostProcessor{
+						&PostProcessor{
+							Type: "foo",
+						},
+					},
+				},
+			},
+			false,
+		},
+
+		{
+			"parse-pp-map.json",
+			&Template{
+				PostProcessors: [][]*PostProcessor{
+					[]*PostProcessor{
+						&PostProcessor{
+							Type: "foo",
+						},
+					},
+				},
+			},
+			false,
+		},
+
+		{
+			"parse-pp-slice.json",
+			&Template{
+				PostProcessors: [][]*PostProcessor{
+					[]*PostProcessor{
+						&PostProcessor{
+							Type: "foo",
+						},
+					},
+					[]*PostProcessor{
+						&PostProcessor{
+							Type: "bar",
+						},
+					},
+				},
+			},
+			false,
+		},
+
+		{
+			"parse-pp-multi.json",
+			&Template{
+				PostProcessors: [][]*PostProcessor{
+					[]*PostProcessor{
+						&PostProcessor{
+							Type: "foo",
+						},
+						&PostProcessor{
+							Type: "bar",
+						},
+					},
+				},
+			},
+			false,
+		},
+
+		{
+			"parse-pp-no-type.json",
+			nil,
+			true,
+		},
 	}
 
 	for _, tc := range cases {

template/template.go

@@ -27,10 +27,10 @@ type Builder struct {
 
 // PostProcessor represents a post-processor within the template.
 type PostProcessor struct {
-	OnlyExcept
+	OnlyExcept `mapstructure:",squash"`
 
 	Type              string
-	KeepInputArtifact bool
+	KeepInputArtifact bool `mapstructure:"keep_input_artifact"`
 	Config            map[string]interface{}
 }
 
@@ -79,3 +79,11 @@ func (b *Builder) GoString() string {
 func (p *Provisioner) GoString() string {
 	return fmt.Sprintf("*%#v", *p)
 }
+
+func (p *PostProcessor) GoString() string {
+	return fmt.Sprintf("*%#v", *p)
+}
+
+func (v *Variable) GoString() string {
+	return fmt.Sprintf("*%#v", *v)
+}

template/test-fixtures/parse-pp-basic.json

+{
+    "post-processors": [{
+        "type": "foo",
+        "foo": "bar"
+    }]
+}

template/test-fixtures/parse-pp-keep.json

+{
+    "post-processors": [{
+        "type": "foo",
+        "keep_input_artifact": true
+    }]
+}

template/test-fixtures/parse-pp-map.json

+{
+    "post-processors": [{
+        "type": "foo"
+    }]
+}

template/test-fixtures/parse-pp-multi.json

+{
+    "post-processors": [[{
+        "type": "foo"
+    }, "bar"]]
+}

template/test-fixtures/parse-pp-no-type.json

+{
+    "post-processors": [{
+        "keep_input_artifact": true
+    }]
+}

template/test-fixtures/parse-pp-slice.json

+{
+    "post-processors": [{
+        "type": "foo"
+    }, "bar"]
+}

template/test-fixtures/parse-pp-string.json

+{
+    "post-processors": ["foo"]
+}