osbuild1: store all stage result metadata

Currently, metadata from osbuild is discarded for all stages except RPM.
Adding explicit support for the ostree.commit stage/assembler and
storing the metadata in a known type.
For all other stages, store the metadata directly without parsing.

The rawAssemblerResult is removed. Assembler results are treated as
stage results.

internal/osbuild1/ostree_commit_assembler.go

@@ -21,3 +21,21 @@ func NewOSTreeCommitAssembler(options *OSTreeCommitAssemblerOptions) *Assembler
 		Options: options,
 	}
 }
+
+type OSTreeCommitStageMetadata struct {
+	Compose struct {
+		Ref                       string `json:"ref"`
+		OSTreeNMetadataTotal      int    `json:"ostree-n-metadata-total"`
+		OSTreeNMetadataWritten    int    `json:"ostree-n-metadata-written"`
+		OSTreeNContentTotal       int    `json:"ostree-n-content-total"`
+		OSTreeNContentWritten     int    `json:"ostree-n-content-written"`
+		OSTreeNCacheHits          int    `json:"ostree-n-cache-hits"`
+		OSTreeContentBytesWritten int    `json:"ostree-content-bytes-written"`
+		OSTreeCommit              string `json:"ostree-commit"`
+		OSTreeContentChecksum     string `json:"ostree-content-checksum"`
+		OSTreeTimestamp           string `json:"ostree-timestamp"`
+		RPMOSTreeInputHash        string `json:"rpm-ostree-inputhash"`
+	} `json:"compose"`
+}
+
+func (OSTreeCommitStageMetadata) isStageMetadata() {}

internal/osbuild1/result.go

@@ -9,13 +9,6 @@ import (
 	"github.com/osbuild/osbuild-composer/internal/osbuild2"
 )
 
-type rawAssemblerResult struct {
-	Name    string          `json:"name"`
-	Options json.RawMessage `json:"options"`
-	Success bool            `json:"success"`
-	Output  string          `json:"output"`
-}
-
 type StageResult struct {
 	Name     string          `json:"name"`
 	Options  json.RawMessage `json:"options"`
@@ -29,6 +22,10 @@ type StageMetadata interface {
 	isStageMetadata()
 }
 
+type RawStageMetadata json.RawMessage
+
+func (RawStageMetadata) isStageMetadata() {}
+
 type rawStageResult struct {
 	Name     string          `json:"name"`
 	Options  json.RawMessage `json:"options"`
@@ -44,12 +41,12 @@ type buildResult struct {
 }
 
 type Result struct {
-	TreeID    string              `json:"tree_id"`
-	OutputID  string              `json:"output_id"`
-	Build     *buildResult        `json:"build"`
-	Stages    []StageResult       `json:"stages"`
-	Assembler *rawAssemblerResult `json:"assembler"`
-	Success   bool                `json:"success"`
+	TreeID    string        `json:"tree_id"`
+	OutputID  string        `json:"output_id"`
+	Build     *buildResult  `json:"build"`
+	Stages    []StageResult `json:"stages"`
+	Assembler *StageResult  `json:"assembler"`
+	Success   bool          `json:"success"`
 }
 
 func (result *StageResult) UnmarshalJSON(data []byte) error {
@@ -66,8 +63,14 @@ func (result *StageResult) UnmarshalJSON(data []byte) error {
 		if err != nil {
 			return err
 		}
+	case "org.osbuild.ostree.commit":
+		metadata = new(OSTreeCommitStageMetadata)
+		err = json.Unmarshal(rawStageResult.Metadata, metadata)
+		if err != nil {
+			return err
+		}
 	default:
-		metadata = nil
+		metadata = RawStageMetadata(rawStageResult.Metadata)
 	}
 
 	result.Name = rawStageResult.Name
@@ -196,7 +199,7 @@ func (cr *Result) fromV2(crv2 osbuild2.Result) {
 	cr.Success = crv2.Success
 	// Empty build and assembler results for new types of jobs
 	cr.Build = new(buildResult)
-	cr.Assembler = new(rawAssemblerResult)
+	cr.Assembler = new(StageResult)
 
 	// crv2.Log contains a map of pipelines. Unfortunately, Go doesn't
 	// preserve the order of keys in a map. See:

internal/osbuild1/result_test.go

@@ -170,7 +170,7 @@ func TestWriteFull(t *testing.T) {
 		Success: true,
 	}
 
-	testAssembler := rawAssemblerResult{
+	testAssembler := StageResult{
 		Name:    "testAssembler",
 		Options: []byte(testOptions),
 		Success: true,