artifact: this represents the artifacts a manifest exports

For now this encapsulates osbuild export and filename in that
exported tree. In the future we could add MIME type.

For now this is a concrete type, but should probably be an
interface, so the consumer of artefacts know they are the right
type. Enforcing we only push AMIs to EC2, etc.

Similarly to how checkpoints work, each pipeline can be marked for
export, and the manifest can return all the names of the exported
pipelines, to be passed to osbuild. Additionally, the Export
function returns an artefact object, which can be used to know how
to access the exports once osbuild is done. For now, this is unused.

internal/artifact/artifact.go

@@ -0,0 +1,31 @@
+package artifact
+
+type Artifact struct {
+	export   string
+	filename string
+	mimeType string
+}
+
+func New(export, filename string, mimeType *string) *Artifact {
+	artifact := &Artifact{
+		export:   export,
+		filename: filename,
+		mimeType: "application/octet-stream",
+	}
+	if mimeType != nil {
+		artifact.mimeType = *mimeType
+	}
+	return artifact
+}
+
+func (a *Artifact) Export() string {
+	return a.export
+}
+
+func (a *Artifact) Filename() string {
+	return a.filename
+}
+
+func (a *Artifact) MIMEType() string {
+	return a.mimeType
+}

internal/manifest/iso.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 )
 
@@ -66,3 +67,9 @@ func xorrisofsStageOptions(filename, isolabel string, isolinux bool) *osbuild.Xo
 
 	return options
 }
+
+func (p *ISO) Export() *artifact.Artifact {
+	p.Base.export = true
+	mimeType := "application/x-iso9660-image"
+	return artifact.New(p.Name(), p.Filename, &mimeType)
+}

internal/manifest/manifest.go

@@ -98,3 +98,13 @@ func (m Manifest) GetCheckpoints() []string {
 	}
 	return checkpoints
 }
+
+func (m Manifest) GetExports() []string {
+	exports := []string{}
+	for _, p := range m.pipelines {
+		if p.getExport() {
+			exports = append(exports, p.Name())
+		}
+	}
+	return exports
+}

internal/manifest/oci_container.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 )
 
@@ -55,3 +56,9 @@ func (p *OCIContainer) serialize() osbuild.Pipeline {
 func (p *OCIContainer) getBuildPackages() []string {
 	return []string{"tar"}
 }
+
+func (p *OCIContainer) Export() *artifact.Artifact {
+	p.Base.export = true
+	mimeType := "application/x-tar"
+	return artifact.New(p.Name(), p.Filename, &mimeType)
+}

internal/manifest/pipeline.go

@@ -7,6 +7,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 	"github.com/osbuild/osbuild-composer/internal/platform"
 	"github.com/osbuild/osbuild-composer/internal/rpmmd"
@@ -15,7 +16,9 @@ import (
 type Pipeline interface {
 	Name() string
 	Checkpoint()
+	Export() *artifact.Artifact
 	getCheckpoint() bool
+	getExport() bool
 	getBuildPackages() []string
 	getPackageSetChain() []rpmmd.PackageSet
 	serializeStart([]rpmmd.PackageSpec)
@@ -33,6 +36,7 @@ type Base struct {
 	name       string
 	build      *Build
 	checkpoint bool
+	export     bool
 }
 
 // Name returns the name of the pipeline. The name must be unique for a given manifest.
@@ -50,6 +54,14 @@ func (p Base) getCheckpoint() bool {
 	return p.checkpoint
 }
 
+func (p *Base) Export() *artifact.Artifact {
+	panic("can't export pipeline")
+}
+
+func (p Base) getExport() bool {
+	return p.export
+}
+
 func (p Base) GetManifest() *Manifest {
 	return p.manifest
 }

internal/manifest/qcow2.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 )
 
@@ -50,3 +51,9 @@ func (p *QCOW2) serialize() osbuild.Pipeline {
 func (p *QCOW2) getBuildPackages() []string {
 	return []string{"qemu-img"}
 }
+
+func (p *QCOW2) Export() *artifact.Artifact {
+	p.Base.export = true
+	mimeType := "application/x-qemu-disk"
+	return artifact.New(p.Name(), p.Filename, &mimeType)
+}

internal/manifest/raw.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 	"github.com/osbuild/osbuild-composer/internal/platform"
 )
@@ -66,3 +67,8 @@ func (p *RawImage) serialize() osbuild.Pipeline {
 
 	return pipeline
 }
+
+func (p *RawImage) Export() *artifact.Artifact {
+	p.Base.export = true
+	return artifact.New(p.Name(), p.Filename, nil)
+}

internal/manifest/tar.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 )
 
@@ -49,3 +50,9 @@ func (p *Tar) serialize() osbuild.Pipeline {
 func (p *Tar) getBuildPackages() []string {
 	return []string{"tar"}
 }
+
+func (p *Tar) Export() *artifact.Artifact {
+	p.Base.export = true
+	mimeType := "application/x-tar"
+	return artifact.New(p.Name(), p.Filename, &mimeType)
+}

internal/manifest/vmdk.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 )
 
@@ -46,3 +47,9 @@ func (p *VMDK) serialize() osbuild.Pipeline {
 func (p *VMDK) getBuildPackages() []string {
 	return []string{"qemu-img"}
 }
+
+func (p *VMDK) Export() *artifact.Artifact {
+	p.Base.export = true
+	mimeType := "application/x-vmdk"
+	return artifact.New(p.Name(), p.Filename, &mimeType)
+}

internal/manifest/vpc.go

@@ -1,6 +1,7 @@
 package manifest
 
 import (
+	"github.com/osbuild/osbuild-composer/internal/artifact"
 	"github.com/osbuild/osbuild-composer/internal/osbuild"
 )
 
@@ -45,3 +46,9 @@ func (p *VPC) serialize() osbuild.Pipeline {
 func (p *VPC) getBuildPackages() []string {
 	return []string{"qemu-img"}
 }
+
+func (p *VPC) Export() *artifact.Artifact {
+	p.Base.export = true
+	mimeType := "application/x-vhd"
+	return artifact.New(p.Name(), p.Filename, &mimeType)
+}