Switch to github.com/golang/dep for vendoring

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

vendor/github.com/opencontainers/image-spec/specs-go/v1/config.go

@@ -14,6 +14,8 @@
 
 package v1
 
+import "time"
+
 // ImageConfig defines the execution parameters which should be used as a base when running a container using an image.
 type ImageConfig struct {
 	// User defines the username or UID which the process in the container should run as.
@@ -52,8 +54,8 @@ type RootFS struct {
 
 // History describes the history of a layer.
 type History struct {
-	// Created is the creation time.
-	Created string `json:"created,omitempty"`
+	// Created is the combined date and time at which the layer was created, formatted as defined by RFC 3339, section 5.6.
+	Created time.Time `json:"created,omitempty"`
 
 	// CreatedBy is the command which created the layer.
 	CreatedBy string `json:"created_by,omitempty"`
@@ -69,9 +71,10 @@ type History struct {
 }
 
 // Image is the JSON structure which describes some basic information about the image.
+// This provides the `application/vnd.oci.image.config.v1+json` mediatype when marshalled to JSON.
 type Image struct {
-	// Created defines an ISO-8601 formatted combined date and time at which the image was created.
-	Created string `json:"created,omitempty"`
+	// Created is the combined date and time at which the image was created, formatted as defined by RFC 3339, section 5.6.
+	Created time.Time `json:"created,omitempty"`
 
 	// Author defines the name and/or email address of the person or entity which created and is responsible for maintaining the image.
 	Author string `json:"author,omitempty"`

vendor/github.com/opencontainers/image-spec/specs-go/v1/descriptor.go

@@ -14,13 +14,16 @@
 
 package v1
 
+import digest "github.com/opencontainers/go-digest"
+
 // Descriptor describes the disposition of targeted content.
+// This structure provides `application/vnd.oci.descriptor.v1+json` mediatype when marshalled to JSON
 type Descriptor struct {
-	// MediaType contains the MIME type of the referenced object.
-	MediaType string `json:"mediaType"`
+	// MediaType is the media type of the object this schema refers to.
+	MediaType string `json:"mediaType,omitempty"`
 
 	// Digest is the digest of the targeted content.
-	Digest string `json:"digest"`
+	Digest digest.Digest `json:"digest"`
 
 	// Size specifies the size in bytes of the blob.
 	Size int64 `json:"size"`

vendor/github.com/opencontainers/image-spec/specs-go/v1/manifest.go

@@ -16,7 +16,7 @@ package v1
 
 import "github.com/opencontainers/image-spec/specs-go"
 
-// Manifest defines a schema2 manifest
+// Manifest provides `application/vnd.oci.image.manifest.list.v1+json` mediatype structure when marshalled to JSON.
 type Manifest struct {
 	specs.Versioned
 

vendor/github.com/opencontainers/image-spec/specs-go/v1/manifest_list.go

@@ -50,7 +50,8 @@ type ManifestDescriptor struct {
 	Platform Platform `json:"platform"`
 }
 
-// ManifestList  references manifests for various platforms.
+// ManifestList references manifests for various platforms.
+// This structure provides `application/vnd.oci.image.manifest.list.v1+json` mediatype when marshalled to JSON.
 type ManifestList struct {
 	specs.Versioned
 

vendor/github.com/opencontainers/image-spec/specs-go/v1/mediatype.go

@@ -25,11 +25,20 @@ const (
 	MediaTypeImageManifestList = "application/vnd.oci.image.manifest.list.v1+json"
 
 	// MediaTypeImageLayer is the media type used for layers referenced by the manifest.
-	MediaTypeImageLayer = "application/vnd.oci.image.layer.v1.tar+gzip"
+	MediaTypeImageLayer = "application/vnd.oci.image.layer.v1.tar"
+
+	// MediaTypeImageLayerGzip is the media type used for gzipped layers
+	// referenced by the manifest.
+	MediaTypeImageLayerGzip = "application/vnd.oci.image.layer.v1.tar+gzip"
 
 	// MediaTypeImageLayerNonDistributable is the media type for layers referenced by
 	// the manifest but with distribution restrictions.
-	MediaTypeImageLayerNonDistributable = "application/vnd.oci.image.layer.nondistributable.v1.tar+gzip"
+	MediaTypeImageLayerNonDistributable = "application/vnd.oci.image.layer.nondistributable.v1.tar"
+
+	// MediaTypeImageLayerNonDistributableGzip is the media type for
+	// gzipped layers referenced by the manifest but with distribution
+	// restrictions.
+	MediaTypeImageLayerNonDistributableGzip = "application/vnd.oci.image.layer.nondistributable.v1.tar+gzip"
 
 	// MediaTypeImageConfig specifies the media type for the image configuration.
 	MediaTypeImageConfig = "application/vnd.oci.image.config.v1+json"

vendor/github.com/opencontainers/image-spec/specs-go/versioned.go

@@ -20,7 +20,4 @@ package specs
 type Versioned struct {
 	// SchemaVersion is the image manifest schema that this image follows
 	SchemaVersion int `json:"schemaVersion"`
-
-	// MediaType is the media type of this schema.
-	MediaType string `json:"mediaType"`
 }