Support named builds in HCL2 templates.

hcl2template/types.build.go

@@ -34,6 +34,9 @@ var buildSchema = &hcl.BodySchema{
 //		post-processor "" { ... }
 //	}
 type BuildBlock struct {
+	// Name is a string representing the named build to show in the logs
+	Name string
+
 	// Sources is the list of sources that we want to start in this build block.
 	Sources []SourceRef
 
@@ -56,6 +59,7 @@ func (p *Parser) decodeBuildConfig(block *hcl.Block) (*BuildBlock, hcl.Diagnosti
 	build := &BuildBlock{}
 
 	var b struct {
+		Name        string   `hcl:"name,optional"`
 		FromSources []string `hcl:"sources"`
 		Config      hcl.Body `hcl:",remain"`
 	}
@@ -64,6 +68,8 @@ func (p *Parser) decodeBuildConfig(block *hcl.Block) (*BuildBlock, hcl.Diagnosti
 		return nil, diags
 	}
 
+	build.Name = b.Name
+
 	for _, buildFrom := range b.FromSources {
 		ref := sourceRefFromString(buildFrom)
 

hcl2template/types.packer_config.go

@@ -353,6 +353,7 @@ func (cfg *PackerConfig) GetBuilds(opts packer.GetBuildsOptions) ([]packer.Build
 			}
 
 			pcb := &packer.CoreBuild{
+				BuildName:      build.Name,
 				Type:           src.Type,
 				Builder:        builder,
 				Provisioners:   provisioners,

packer/build.go

@@ -86,6 +86,7 @@ type Build interface {
 // multiple files, of course, but it should be for only a single provider (such
 // as VirtualBox, EC2, etc.).
 type CoreBuild struct {
+	BuildName          string
 	Type               string
 	Builder            Builder
 	BuilderConfig      interface{}
@@ -128,6 +129,9 @@ type CoreBuildProvisioner struct {
 
 // Returns the name of the build.
 func (b *CoreBuild) Name() string {
+	if b.BuildName != "" {
+		return b.BuildName
+	}
 	return b.Type
 }