Use buildah commit and bud in podman

Vendor in buildah and use as much of commit and bug as possible for podman
build and commit.

Resolves #586
Signed-off-by: baude <bbaude@redhat.com>

Closes: #681
Approved by: mheon

vendor/github.com/projectatomic/buildah/import.go

@@ -0,0 +1,123 @@
+package buildah
+
+import (
+	"context"
+
+	is "github.com/containers/image/storage"
+	"github.com/containers/image/types"
+	"github.com/containers/storage"
+	"github.com/opencontainers/go-digest"
+	"github.com/pkg/errors"
+	"github.com/projectatomic/buildah/docker"
+	"github.com/projectatomic/buildah/util"
+)
+
+func importBuilderDataFromImage(ctx context.Context, store storage.Store, systemContext *types.SystemContext, imageID, containerName, containerID string) (*Builder, error) {
+	manifest := []byte{}
+	config := []byte{}
+	imageName := ""
+
+	if imageID != "" {
+		ref, err := is.Transport.ParseStoreReference(store, imageID)
+		if err != nil {
+			return nil, errors.Wrapf(err, "no such image %q", imageID)
+		}
+		src, err2 := ref.NewImage(ctx, systemContext)
+		if err2 != nil {
+			return nil, errors.Wrapf(err2, "error instantiating image")
+		}
+		defer src.Close()
+		config, err = src.ConfigBlob(ctx)
+		if err != nil {
+			return nil, errors.Wrapf(err, "error reading image configuration")
+		}
+		manifest, _, err = src.Manifest(ctx)
+		if err != nil {
+			return nil, errors.Wrapf(err, "error reading image manifest")
+		}
+		if img, err3 := store.Image(imageID); err3 == nil {
+			if len(img.Names) > 0 {
+				imageName = img.Names[0]
+			}
+		}
+	}
+
+	builder := &Builder{
+		store:            store,
+		Type:             containerType,
+		FromImage:        imageName,
+		FromImageID:      imageID,
+		Config:           config,
+		Manifest:         manifest,
+		Container:        containerName,
+		ContainerID:      containerID,
+		ImageAnnotations: map[string]string{},
+		ImageCreatedBy:   "",
+	}
+
+	builder.initConfig()
+
+	return builder, nil
+}
+
+func importBuilder(ctx context.Context, store storage.Store, options ImportOptions) (*Builder, error) {
+	if options.Container == "" {
+		return nil, errors.Errorf("container name must be specified")
+	}
+
+	c, err := store.Container(options.Container)
+	if err != nil {
+		return nil, err
+	}
+
+	systemContext := getSystemContext(&types.SystemContext{}, options.SignaturePolicyPath)
+
+	builder, err := importBuilderDataFromImage(ctx, store, systemContext, c.ImageID, options.Container, c.ID)
+	if err != nil {
+		return nil, err
+	}
+
+	if builder.FromImageID != "" {
+		if d, err2 := digest.Parse(builder.FromImageID); err2 == nil {
+			builder.Docker.Parent = docker.ID(d)
+		} else {
+			builder.Docker.Parent = docker.ID(digest.NewDigestFromHex(digest.Canonical.String(), builder.FromImageID))
+		}
+	}
+	if builder.FromImage != "" {
+		builder.Docker.ContainerConfig.Image = builder.FromImage
+	}
+
+	err = builder.Save()
+	if err != nil {
+		return nil, errors.Wrapf(err, "error saving builder state")
+	}
+
+	return builder, nil
+}
+
+func importBuilderFromImage(ctx context.Context, store storage.Store, options ImportFromImageOptions) (*Builder, error) {
+	var img *storage.Image
+	var err error
+
+	if options.Image == "" {
+		return nil, errors.Errorf("image name must be specified")
+	}
+
+	systemContext := getSystemContext(options.SystemContext, options.SignaturePolicyPath)
+
+	for _, image := range util.ResolveName(options.Image, "", systemContext, store) {
+		img, err = util.FindImage(store, image)
+		if err != nil {
+			continue
+		}
+
+		builder, err2 := importBuilderDataFromImage(ctx, store, systemContext, img.ID, "", "")
+		if err2 != nil {
+			return nil, errors.Wrapf(err2, "error importing build settings from image %q", options.Image)
+		}
+
+		return builder, nil
+	}
+	return nil, errors.Wrapf(err, "error locating image %q for importing settings", options.Image)
+}