image: add new gce pipeline to BootcDiskImage

There is a request that we provide a new image type that can
be imported directly into GCE. This requires a `tar.gz` with
a `disk.raw` inside and specific tar options.

This commit adds the needed pipeline to generate this.

Note that this will require a way to rename files during
the tar build as we do not want to hardcode the raw image
filename.

pkg/image/bootc_disk.go

@@ -3,7 +3,9 @@ package image
 import (
 	"fmt"
 	"math/rand"
+	"regexp"
 
+	"github.com/osbuild/images/internal/common"
 	"github.com/osbuild/images/pkg/container"
 	"github.com/osbuild/images/pkg/customizations/users"
 	"github.com/osbuild/images/pkg/disk"
@@ -89,5 +91,17 @@ func (img *BootcDiskImage) InstantiateManifestFromContainers(m *manifest.Manifes
 		fmt.Sprintf("%s.vmdk", fileBasename),
 		fmt.Sprintf("%s.vhd", fileBasename),
 	}
+
+	// XXX: copied from https://github.com/osbuild/images/blob/v0.85.0/pkg/image/disk.go#L102
+	gcePipeline := manifest.NewTar(buildPipeline, rawImage, "gce")
+	gcePipeline.Format = osbuild.TarArchiveFormatOldgnu
+	gcePipeline.RootNode = osbuild.TarRootNodeOmit
+	// these are required to successfully import the image to GCP
+	gcePipeline.ACLs = common.ToPtr(false)
+	gcePipeline.SELinux = common.ToPtr(false)
+	gcePipeline.Xattrs = common.ToPtr(false)
+	gcePipeline.Transform = fmt.Sprintf(`s/%s/disk.raw`, regexp.QuoteMeta(rawImage.Filename()))
+	gcePipeline.SetFilename("image.tgz")
+
 	return nil
 }

pkg/image/bootc_disk_test.go

@@ -201,6 +201,10 @@ func TestBootcDiskImageExportPipelines(t *testing.T) {
 	// tar pipeline for ova
 	tarPipeline := findPipelineFromOsbuildManifest(t, osbuildManifest, "archive")
 	require.NotNil(tarPipeline)
+
+	// raw-tgz pipeline
+	gcePipeline := findPipelineFromOsbuildManifest(t, osbuildManifest, "gce")
+	require.NotNil(gcePipeline)
 }
 
 func TestBootcDiskImageInstantiateUsers(t *testing.T) {