Replace Runtime.LoadFromArchive with Runtime.LoadFromArchiveReference

All callers of LoadFromArchive expect the input to be in the
transport:name format, or create it that way.  So, pass a
types.ImageReference instead of a string.

That requires us to add an explicit parse step in (podman pull);
in (podman load) we can, instead of pasting strings, create
native objects directly.

Changes the error behavior of (podman pull), we no longer
try heuristically parsing docker-archive:... inputs as
Docker references.

Also changes the string reported by (podman load) if all parsing
attempts fail, to be only the path instead of dir:path.  The error
message itself is likely to be the same (from directory.Transport).

(While at it, update a mismatched comment.)

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Closes: #1176
Approved by: rhatdan

cmd/podman/load.go

@@ -6,9 +6,11 @@ import (
 	"io/ioutil"
 	"os"
 
+	"github.com/containers/image/directory"
+	dockerarchive "github.com/containers/image/docker/archive"
+	ociarchive "github.com/containers/image/oci/archive"
 	"github.com/pkg/errors"
 	"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
-	"github.com/projectatomic/libpod/libpod"
 	"github.com/projectatomic/libpod/libpod/image"
 	"github.com/urfave/cli"
 )
@@ -104,20 +106,24 @@ func loadCmd(c *cli.Context) error {
 
 	ctx := getContext()
 
-	src := libpod.DockerArchive + ":" + input
-	newImages, err := runtime.ImageRuntime().LoadFromArchive(ctx, src, c.String("signature-policy"), writer)
+	var newImages []*image.Image
+	src, err := dockerarchive.ParseReference(input) // FIXME? We should add dockerarchive.NewReference()
+	if err == nil {
+		newImages, err = runtime.ImageRuntime().LoadFromArchiveReference(ctx, src, c.String("signature-policy"), writer)
+	}
 	if err != nil {
 		// generate full src name with specified image:tag
-		fullSrc := libpod.OCIArchive + ":" + input
-		if imageName != "" {
-			fullSrc = fullSrc + ":" + imageName
+		src, err := ociarchive.NewReference(input, imageName) // imageName may be ""
+		if err == nil {
+			newImages, err = runtime.ImageRuntime().LoadFromArchiveReference(ctx, src, c.String("signature-policy"), writer)
 		}
-		newImages, err = runtime.ImageRuntime().LoadFromArchive(ctx, fullSrc, c.String("signature-policy"), writer)
 		if err != nil {
-			src = libpod.DirTransport + ":" + input
-			newImages, err = runtime.ImageRuntime().LoadFromArchive(ctx, src, c.String("signature-policy"), writer)
+			src, err := directory.NewReference(input)
+			if err == nil {
+				newImages, err = runtime.ImageRuntime().LoadFromArchiveReference(ctx, src, c.String("signature-policy"), writer)
+			}
 			if err != nil {
-				return errors.Wrapf(err, "error pulling %q", src)
+				return errors.Wrapf(err, "error pulling %q", input)
 			}
 		}
 	}

cmd/podman/pull.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/containers/image/transports/alltransports"
 	"github.com/containers/image/types"
 	"github.com/pkg/errors"
 	"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
@@ -110,9 +111,13 @@ func pullCmd(c *cli.Context) error {
 		forceSecure = c.Bool("tls-verify")
 	}
 
-	// Possible for docker-archive to have multiple tags, so use NewFromLoad instead
+	// Possible for docker-archive to have multiple tags, so use LoadFromArchiveReference instead
 	if strings.HasPrefix(image, libpod.DockerArchive+":") {
-		newImage, err := runtime.ImageRuntime().LoadFromArchive(getContext(), image, c.String("signature-policy"), writer)
+		srcRef, err := alltransports.ParseImageName(image)
+		if err != nil {
+			return errors.Wrapf(err, "error parsing %q", image)
+		}
+		newImage, err := runtime.ImageRuntime().LoadFromArchiveReference(getContext(), srcRef, c.String("signature-policy"), writer)
 		if err != nil {
 			return errors.Wrapf(err, "error pulling image from %q", image)
 		}

libpod/image/image.go

@@ -159,17 +159,17 @@ func (ir *Runtime) New(ctx context.Context, name, signaturePolicyPath, authfile
 	return &newImage, nil
 }
 
-// LoadFromArchive creates a new image object for images pulled from a tar archive (podman load)
+// LoadFromArchiveReference creates a new image object for images pulled from a tar archive and the like (podman load)
 // This function is needed because it is possible for a tar archive to have multiple tags for one image
-func (ir *Runtime) LoadFromArchive(ctx context.Context, name, signaturePolicyPath string, writer io.Writer) ([]*Image, error) {
+func (ir *Runtime) LoadFromArchiveReference(ctx context.Context, srcRef types.ImageReference, signaturePolicyPath string, writer io.Writer) ([]*Image, error) {
 	var newImages []*Image
 
 	if signaturePolicyPath == "" {
 		signaturePolicyPath = ir.SignaturePolicyPath
 	}
-	imageNames, err := ir.pullImage(ctx, name, writer, "", signaturePolicyPath, SigningOptions{}, &DockerRegistryOptions{}, false)
+	imageNames, err := ir.pullImage(ctx, transports.ImageName(srcRef), writer, "", signaturePolicyPath, SigningOptions{}, &DockerRegistryOptions{}, false)
 	if err != nil {
-		return nil, errors.Wrapf(err, "unable to pull %s", name)
+		return nil, errors.Wrapf(err, "unable to pull %s", transports.ImageName(srcRef))
 	}
 
 	for _, name := range imageNames {