test: add some more compose tests

Signed-off-by: Ramkumar Chinchani <[email protected]>

pkg/oci/oci.go

@@ -85,7 +85,7 @@ func UpdateImageConfig(oci casext.Engine, name string, newConfig ispec.Image, ne
 	return desc, nil
 }
 
-func unpackOne(ociDir string, bundlePath string, digest digest.Digest, isSquashfs bool) error {
+func UnpackOne(ociDir string, bundlePath string, digest digest.Digest, isSquashfs bool) error {
 	if isSquashfs {
 		return squashfs.ExtractSingleSquash(
 			path.Join(ociDir, "blobs", "sha256", digest.Encoded()),
@@ -134,7 +134,7 @@ func Unpack(ociLayout, tag string, pathfunc func(digest.Digest) string) (int, er
 			// don't really need to do this in parallel, but what
 			// the hell.
 			pool.Add(func(ctx context.Context) error {
-				return unpackOne(ociLayout, contents, digest, true)
+				return UnpackOne(ociLayout, contents, digest, true)
 			})
 		} else {
 			switch layer.MediaType {
@@ -151,7 +151,7 @@ func Unpack(ociLayout, tag string, pathfunc func(digest.Digest) string) (int, er
 				// shifting, we can use the fancier features of context
 				// cancelling in the thread pool...
 				pool.Add(func(ctx context.Context) error {
-					return unpackOne(ociLayout, contents, digest, false)
+					return UnpackOne(ociLayout, contents, digest, false)
 				})
 			default:
 				return -1, errors.Errorf("unknown media type %s", layer.MediaType)

pkg/overlay/overlay.go

@@ -15,6 +15,7 @@ import (
 	"github.com/pkg/errors"
 	"golang.org/x/sys/unix"
 	"stackerbuild.io/stacker/pkg/mount"
+	"stackerbuild.io/stacker/pkg/oci"
 	"stackerbuild.io/stacker/pkg/squashfs"
 	"stackerbuild.io/stacker/pkg/types"
 )
@@ -184,7 +185,7 @@ func (o *overlay) snapshot(source string, target string) error {
 			// We have done an unsquashfs of this atom
 			continue
 		}
-		if err := unpackOne(cacheDir, contents, digest, true); err != nil {
+		if err := oci.UnpackOne(cacheDir, contents, digest, true); err != nil {
 			return errors.Wrapf(err, "Failed mounting %#v", layer)
 		}
 	}

test/import.bats

@@ -405,6 +405,21 @@ cimg-import:
       dest: /
     run: |
       [ -d /var/lib/apk ]
+
+compose-img:
+    from:
+      type: oci
+      url: $CENTOS_OCI
+    import:
+    - path: docker://ghcr.io/homebrew/core/openssl/1.1:1.1.1k
+      dest: /
+    - path: docker://ghcr.io/homebrew/core/curl:8.0.1
+      dest: /
+    - path: docker://ghcr.io/homebrew/core/ca-certificates:2022-10-11
+      dest: /
+    run: |
+      [ -f /curl/8.0.1/bin/curl ]
+      [ -f /ca-certificates/2022-10-11/share/ca-certificates/cacert.pem ]
 EOF
     stacker build
 }