Repository: google/go-containerregistry
Pull request #1010 (2021-05-03 20:46:08)

Fix various lint issues
1. Typo
2. Missing package doc comment
3. Tautological conditional

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> The diff coverage is `0.00%`.

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```diff
@@           Coverage Diff           @@
##             main    #1010   +/-   ##
=======================================
  Coverage   75.33%   75.33%           
=======================================
  Files         107      107           
  Lines        5036     5036           
=======================================
  Hits         3794     3794           
  Misses        701      701           
  Partials      541      541           
```


| [Impacted Files](https://codecov.io/gh/google/go-containerregistry/pull/1010?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google) | Coverage Δ | |
|---|---|---|
| [internal/and/and\_closer.go](https://codecov.io/gh/google/go-containerregistry/pull/1010/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-aW50ZXJuYWwvYW5kL2FuZF9jbG9zZXIuZ28=) | `100.00% <ø> (ø)` | |
| [internal/estargz/estargz.go](https://codecov.io/gh/google/go-containerregistry/pull/1010/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-aW50ZXJuYWwvZXN0YXJnei9lc3Rhcmd6Lmdv) | `100.00% <ø> (ø)` | |
| [internal/gzip/zip.go](https://codecov.io/gh/google/go-containerregistry/pull/1010/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-aW50ZXJuYWwvZ3ppcC96aXAuZ28=) | `88.57% <ø> (ø)` | |
| [internal/verify/verify.go](https://codecov.io/gh/google/go-containerregistry/pull/1010/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-aW50ZXJuYWwvdmVyaWZ5L3ZlcmlmeS5nbw==) | `100.00% <ø> (ø)` | |
| [pkg/v1/cache/cache.go](https://codecov.io/gh/google/go-containerregistry/pull/1010/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-cGtnL3YxL2NhY2hlL2NhY2hlLmdv) | `52.83% <0.00%> (ø)` | |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/google/go-containerregistry/pull/1010?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google). Last update [9cf3ed4...4e72261](https://codecov.io/gh/google/go-containerregistry/pull/1010?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google).


Patch:
diff --git a/.github/workflows/knative-releasability.yaml b/.github/workflows/knative-releasability.yaml
index 5a30c913..c4f5fb73 100644
--- a/.github/workflows/knative-releasability.yaml
+++ b/.github/workflows/knative-releasability.yaml
@@ -36,8 +36,8 @@ jobs:
     env:
       #########################################
       #   Update this section each release.   #
-      RELEASE: 'v0.22'
-      SLACK_CHANNEL: 'release-22'
+      RELEASE: 'v0.23'
+      SLACK_CHANNEL: 'release-23'
       #########################################
 
     steps:
@@ -110,25 +110,15 @@ jobs:
           # If we don't run `git status` before the "git diff-index" it seems
           # to list every file that's been touched by codegen.
           git status
-          FOUND_DIFF=0
-          for x in $(git diff-index --name-only HEAD --); do
-            if [ "$(basename $x)" = "go.mod" ]; then
-              continue
-            elif [ "$(basename $x)" = "go.sum" ]; then
-              continue
-            elif [ "$(basename $x)" = "modules.txt" ]; then
-              continue
-            fi
-            echo "Found non-module diff: $x"
-            FOUND_DIFF=1
-            break
-          done
+
+          CHANGED="$(git diff-index --name-only HEAD --)"
 
           # If we see no changes after the upgrade, then we are up to date.
-          if [[ "$FOUND_DIFF" -eq "0"  ]]; then
+          if [[ "$CHANGED" == "" ]]; then
               echo "VERIFY_MESSAGE=${{ github.repository }} up to date." >> $GITHUB_ENV
           else
               echo "VERIFY_MESSAGE=${{ github.repository }} is out of date." >> $GITHUB_ENV
+              echo "The following files are changed: $CHANGED"
               echo 'current=false' >> $GITHUB_ENV
           fi
 
diff --git a/.github/workflows/knative-release-notes.yaml b/.github/workflows/knative-release-notes.yaml
index 517f429b..172eb390 100644
--- a/.github/workflows/knative-release-notes.yaml
+++ b/.github/workflows/knative-release-notes.yaml
@@ -41,7 +41,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15.x
+          go-version: 1.16.x
 
       - name: Install Dependencies
         run: GO111MODULE=on go get k8s.io/release/cmd/release-notes
diff --git a/cmd/crane/cmd/root.go b/cmd/crane/cmd/root.go
index f1123425..a385513d 100644
--- a/cmd/crane/cmd/root.go
+++ b/cmd/crane/cmd/root.go
@@ -43,6 +43,7 @@ func New(use, short string, options []crane.Option) *cobra.Command {
 		Short:             short,
 		Run:               func(cmd *cobra.Command, _ []string) { cmd.Usage() },
 		DisableAutoGenTag: true,
+		SilenceUsage:      true,
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
 			// TODO(jonjohnsonjr): crane.Verbose option?
 			if verbose {
diff --git a/cmd/crane/cmd/validate.go b/cmd/crane/cmd/validate.go
index 4494515e..843c18f0 100644
--- a/cmd/crane/cmd/validate.go
+++ b/cmd/crane/cmd/validate.go
@@ -26,7 +26,10 @@ import (
 
 // NewCmdValidate creates a new cobra.Command for the validate subcommand.
 func NewCmdValidate(options *[]crane.Option) *cobra.Command {
-	var tarballPath, remoteRef string
+	var (
+		tarballPath, remoteRef string
+		fast                   bool
+	)
 
 	validateCmd := &cobra.Command{
 		Use:   "validate",
@@ -45,8 +48,13 @@ func NewCmdValidate(options *[]crane.Option) *cobra.Command {
 					return fmt.Errorf("failed to read image %s: %v", flag, err)
 				}
 
-				if err := validate.Image(img); err != nil {
+				opt := []validate.Option{}
+				if fast {
+					opt = append(opt, validate.Fast)
+				}
+				if err := validate.Image(img, opt...); err != nil {
 					fmt.Printf("FAIL: %s: %v\n", flag, err)
+					return err
 				} else {
 					fmt.Printf("PASS: %s\n", flag)
 				}
@@ -56,6 +64,7 @@ func NewCmdValidate(options *[]crane.Option) *cobra.Command {
 	}
 	validateCmd.Flags().StringVar(&tarballPath, "tarball", "", "Path to tarball to validate")
 	validateCmd.Flags().StringVar(&remoteRef, "remote", "", "Name of remote image to validate")
+	validateCmd.Flags().BoolVar(&fast, "fast", false, "Skip downloading/digesting layers")
 
 	return validateCmd
 }
diff --git a/cmd/crane/doc/crane_validate.md b/cmd/crane/doc/crane_validate.md
index d222965b..6134a5d7 100644
--- a/cmd/crane/doc/crane_validate.md
+++ b/cmd/crane/doc/crane_validate.md
@@ -13,6 +13,7 @@ crane validate [flags]
 ### Options
 
 ```
+      --fast             Skip downloading/digesting layers
   -h, --help             help for validate
       --remote string    Name of remote image to validate
       --tarball string   Path to tarball to validate
diff --git a/cmd/crane/main.go b/cmd/crane/main.go
index 3c962543..58984682 100644
--- a/cmd/crane/main.go
+++ b/cmd/crane/main.go
@@ -15,7 +15,6 @@
 package main
 
 import (
-	"fmt"
 	"os"
 
 	"github.com/google/go-containerregistry/cmd/crane/cmd"
@@ -29,7 +28,6 @@ func init() {
 
 func main() {
 	if err := cmd.Root.Execute(); err != nil {
-		fmt.Println(err)
 		os.Exit(1)
 	}
 }
diff --git a/cmd/gcrane/main.go b/cmd/gcrane/main.go
index 7de24a8d..af6e502a 100644
--- a/cmd/gcrane/main.go
+++ b/cmd/gcrane/main.go
@@ -15,7 +15,6 @@
 package main
 
 import (
-	"fmt"
 	"os"
 
 	"github.com/google/go-containerregistry/cmd/crane/cmd"
@@ -62,7 +61,6 @@ func main() {
 	}
 
 	if err := root.Execute(); err != nil {
-		fmt.Println(err)
 		os.Exit(1)
 	}
 }
diff --git a/internal/and/and_closer.go b/internal/and/and_closer.go
index 52908e5c..14a05eaa 100644
--- a/internal/and/and_closer.go
+++ b/internal/and/and_closer.go
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package and provides helpers for adding Close to io.{Reader|Writer}.
 package and
 
 import (
diff --git a/internal/estargz/estargz.go b/internal/estargz/estargz.go
index 6404d3d9..35b1d8e7 100644
--- a/internal/estargz/estargz.go
+++ b/internal/estargz/estargz.go
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package estargz adapts the containerd estargz package to our abstractions.
 package estargz
 
 import (
@@ -33,7 +34,7 @@ var _ io.ReadCloser = (*estargz.Blob)(nil)
 //  * An error if the estargz processing encountered a problem.
 //
 // Refer to estargz for the options:
-// https://pkg.go.dev/github.com/containerd/stargz-snapshotter@v0.2.0/estargz#Option
+// https://pkg.go.dev/github.com/containerd/stargz-snapshotter/estargz@v0.4.1#Option
 func ReadCloser(r io.ReadCloser, opts ...estargz.Option) (*estargz.Blob, v1.Hash, error) {
 	defer r.Close()
 
diff --git a/internal/gzip/zip.go b/internal/gzip/zip.go
index bf1d66a5..e7d673ff 100644
--- a/internal/gzip/zip.go
+++ b/internal/gzip/zip.go
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package gzip provides helper functions for interacting with gzipped streams.
 package gzip
 
 import (
@@ -72,7 +73,7 @@ func ReadCloserLevel(r io.ReadCloser, level int) io.ReadCloser {
 			return pw.CloseWithError(err)
 		}
 
-		// We dont' really care if these fail.
+		// We don't really care if these fail.
 		defer pw.Close()
 		defer r.Close()
 
diff --git a/internal/verify/verify.go b/internal/verify/verify.go
index d0bc8ac2..44468038 100644
--- a/internal/verify/verify.go
+++ b/internal/verify/verify.go
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package verify provides a ReadCloser that verifies content matches the
+// expected hash values.
 package verify
 
 import (
diff --git a/pkg/authn/k8schain/go.mod b/pkg/authn/k8schain/go.mod
index dbf78b71..56dfa7f7 100644
--- a/pkg/authn/k8schain/go.mod
+++ b/pkg/authn/k8schain/go.mod
@@ -3,23 +3,15 @@ module github.com/google/go-containerregistry/pkg/authn/k8schain
 go 1.14
 
 require (
-	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/google/go-containerregistry v0.4.1-0.20210128200529-19c2b639fab1
-	github.com/google/uuid v1.1.2 // indirect
 	github.com/onsi/gomega v1.10.3 // indirect
-	github.com/vdemeester/k8s-pkg-credentialprovider v1.19.7
-	golang.org/x/net v0.0.0-20210119194325-5f4716e94777 // indirect
-	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c // indirect
+	github.com/vdemeester/k8s-pkg-credentialprovider v1.21.0-1
 	golang.org/x/text v0.3.5 // indirect
-	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
-	k8s.io/api v0.19.7
-	k8s.io/apimachinery v0.19.7
-	k8s.io/client-go v0.19.7
-	k8s.io/klog/v2 v2.5.0 // indirect
-	k8s.io/kube-openapi v0.0.0-20210113233702-8566a335510f // indirect
+	k8s.io/api v0.21.0
+	k8s.io/apimachinery v0.21.0
+	k8s.io/client-go v0.21.0
 )
 
 replace github.com/google/go-containerregistry => ../../..
diff --git a/pkg/authn/k8schain/go.sum b/pkg/authn/k8schain/go.sum
index 528e98f7..e86e957f 100644
--- a/pkg/authn/k8schain/go.sum
+++ b/pkg/authn/k8schain/go.sum
@@ -1,3 +1,4 @@
+bitbucket.org/bertimus9/systemstat v0.0.0-20180207000608-0eeff89b0690/go.mod h1:Ulb78X89vxKYgdL24HMTiXYHlyHEvruOj1ZPlqeNEZM=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
@@ -9,27 +10,40 @@ cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6T
 cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
 cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
 cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
 cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/Azure/azure-sdk-for-go v43.0.0+incompatible h1:/wSNCu0e6EsHFR4Qa3vBEBbicaprEHMyyga9g8RTULI=
 github.com/Azure/azure-sdk-for-go v43.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
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 github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
 github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest v0.9.6 h1:5YWtOnckcudzIw8lPPBcWOnmIFWMtHci1ZWAZulMSx0=
 github.com/Azure/go-autorest/autorest v0.9.6/go.mod h1:/FALq9T/kS7b5J5qsQ+RSTUdAmGFqi0vUdVNNx8q630=
+github.com/Azure/go-autorest/autorest v0.11.12 h1:gI8ytXbxMfI+IVbI9mP2JGCTXIuhHLgRlvQ9X4PsnHE=
+github.com/Azure/go-autorest/autorest v0.11.12/go.mod h1:eipySxLmqSyC5s5k1CLupqet0PSENBEDP93LQ9a8QYw=
 github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
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@@ -127,16 +197,28 @@ github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymF
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@@ -148,22 +230,61 @@ github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7
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@@ -175,11 +296,15 @@ github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
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@@ -189,25 +314,33 @@ github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QD
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@@ -587,7 +938,13 @@ google.golang.org/api v0.15.1-0.20200106000736-b8fc810ca6b5/go.mod h1:iLdEw5Ide6
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@@ -608,23 +965,39 @@ google.golang.org/genproto v0.0.0-20191115194625-c23dd37a84c9/go.mod h1:n3cpQtvx
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 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.9/go.mod h1:dzAXnQbTRyDlZPJX2SUPEqvnB+j7AJjtlox7PEwigU0=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.15/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
+sigs.k8s.io/kustomize/api v0.8.5/go.mod h1:M377apnKT5ZHJS++6H4rQoCHmWtt6qTpp3mbe7p6OLY=
+sigs.k8s.io/kustomize/cmd/config v0.9.7/go.mod h1:MvXCpHs77cfyxRmCNUQjIqCmZyYsbn5PyQpWiq44nW0=
+sigs.k8s.io/kustomize/kustomize/v4 v4.0.5/go.mod h1:C7rYla7sI8EnxHE/xEhRBSHMNfcL91fx0uKmUlUhrBk=
+sigs.k8s.io/kustomize/kyaml v0.10.15/go.mod h1:mlQFagmkm1P+W4lZJbJ/yaxMd8PqMRSC4cPcfUVt5Hg=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.1/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
-sigs.k8s.io/structured-merge-diff/v4 v4.0.2 h1:YHQV7Dajm86OuqnIR6zAelnDWBRjo+YhYV9PmGrh1s8=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0 h1:C4r9BgJ98vrKnnVCjwCSXcWjWe0NKcUQkmzDXZXGwH8=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
diff --git a/pkg/v1/cache/cache.go b/pkg/v1/cache/cache.go
index 54a0dc43..c4e752ce 100644
--- a/pkg/v1/cache/cache.go
+++ b/pkg/v1/cache/cache.go
@@ -77,7 +77,7 @@ func (l *lazyLayer) Compressed() (io.ReadCloser, error) {
 		// Layer found in the cache.
 		logs.Progress.Printf("Layer %s found (compressed) in cache", digest)
 		return cl.Compressed()
-	} else if err != nil && err != ErrNotFound {
+	} else if err != ErrNotFound {
 		return nil, err
 	}
 
@@ -99,7 +99,7 @@ func (l *lazyLayer) Uncompressed() (io.ReadCloser, error) {
 		// Layer found in the cache.
 		logs.Progress.Printf("Layer %s found (uncompressed) in cache", diffID)
 		return cl.Uncompressed()
-	} else if err != nil && err != ErrNotFound {
+	} else if err != ErrNotFound {
 		return nil, err
 	}
 
diff --git a/pkg/v1/google/auth.go b/pkg/v1/google/auth.go
index 15b74e98..65f5bfdb 100644
--- a/pkg/v1/google/auth.go
+++ b/pkg/v1/google/auth.go
@@ -70,7 +70,7 @@ func NewGcloudAuthenticator() (authn.Authenticator, error) {
 		return authn.Anonymous, nil
 	}
 
-	ts := gcloudSource{GetGcloudCmd()}
+	ts := gcloudSource{GetGcloudCmd}
 
 	// Attempt to fetch a token to ensure gcloud is installed and we can run it.
 	token, err := ts.Token()
@@ -145,12 +145,12 @@ type gcloudOutput struct {
 
 type gcloudSource struct {
 	// This is passed in so that we mock out gcloud and test Token.
-	cmd *exec.Cmd
+	exec func() *exec.Cmd
 }
 
 // Token implements oauath2.TokenSource.
 func (gs gcloudSource) Token() (*oauth2.Token, error) {
-	cmd := gs.cmd
+	cmd := gs.exec()
 	var out bytes.Buffer
 	cmd.Stdout = &out
 
diff --git a/pkg/v1/layout/image.go b/pkg/v1/layout/image.go
index 7c76a10c..c38ddd11 100644
--- a/pkg/v1/layout/image.go
+++ b/pkg/v1/layout/image.go
@@ -17,6 +17,7 @@ package layout
 import (
 	"fmt"
 	"io"
+	"os"
 	"sync"
 
 	v1 "github.com/google/go-containerregistry/pkg/v1"
@@ -84,20 +85,20 @@ func (li *layoutImage) LayerByDigest(h v1.Hash) (partial.CompressedLayer, error)
 	}
 
 	if h == manifest.Config.Digest {
-		return partial.CompressedLayer(&compressedBlob{
+		return &compressedBlob{
 			path: li.path,
 			desc: manifest.Config,
-		}), nil
+		}, nil
 	}
 
 	for _, desc := range manifest.Layers {
 		if h == desc.Digest {
 			switch desc.MediaType {
 			case types.OCILayer, types.DockerLayer:
-				return partial.CompressedToLayer(&compressedBlob{
+				return &compressedBlob{
 					path: li.path,
 					desc: desc,
-				})
+				}, nil
 			default:
 				// TODO: We assume everything is a compressed blob, but that might not be true.
 				// TODO: Handle foreign layers.
@@ -129,3 +130,12 @@ func (b *compressedBlob) Size() (int64, error) {
 func (b *compressedBlob) MediaType() (types.MediaType, error) {
 	return b.desc.MediaType, nil
 }
+
+// See partial.Exists.
+func (b *compressedBlob) Exists() (bool, error) {
+	_, err := os.Stat(b.path.blobPath(b.desc.Digest))
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return err == nil, err
+}
diff --git a/pkg/v1/partial/README.md b/pkg/v1/partial/README.md
index 009214a8..c5710f9a 100644
--- a/pkg/v1/partial/README.md
+++ b/pkg/v1/partial/README.md
@@ -64,3 +64,19 @@ there are cases where it is very helpful to know the layer size, e.g. when
 writing the uncompressed layer into a tarball.
 
 See [`#655`](https://github.com/google/go-containerregistry/pull/655).
+
+### [`partial.Exists`](https://godoc.org/github.com/google/go-containerregistry/pkg/v1/partial#Exists)
+
+We generally don't care about the existence of something as granular as a
+layer, and would rather ensure all the invariants of an image are upheld via
+the `validate` package. However, there are situations where we want to do a
+quick smoke test to ensure that the underlying storage engine hasn't been
+corrupted by something e.g. deleting files or blobs. Thus, we've exposed an
+optional `Exists` method that does an existence check without actually reading
+any bytes.
+
+The `remote` package implements this via `HEAD` requests.
+
+The `layout` package implements this via `os.Stat`.
+
+See [`#838`](https://github.com/google/go-containerregistry/pull/838).
diff --git a/pkg/v1/partial/with.go b/pkg/v1/partial/with.go
index b24f31c7..3a5c6157 100644
--- a/pkg/v1/partial/with.go
+++ b/pkg/v1/partial/with.go
@@ -297,33 +297,10 @@ type Describable interface {
 // UncompressedToImage.
 func Descriptor(d Describable) (*v1.Descriptor, error) {
 	// If Describable implements Descriptor itself, return that.
-	if wd, ok := d.(withDescriptor); ok {
+	if wd, ok := unwrap(d).(withDescriptor); ok {
 		return wd.Descriptor()
 	}
 
-	// Otherwise, try to unwrap any partial implementations to see
-	// if the wrapped struct implements Descriptor.
-	if ule, ok := d.(*uncompressedLayerExtender); ok {
-		if wd, ok := ule.UncompressedLayer.(withDescriptor); ok {
-			return wd.Descriptor()
-		}
-	}
-	if cle, ok := d.(*compressedLayerExtender); ok {
-		if wd, ok := cle.CompressedLayer.(withDescriptor); ok {
-			return wd.Descriptor()
-		}
-	}
-	if uie, ok := d.(*uncompressedImageExtender); ok {
-		if wd, ok := uie.UncompressedImageCore.(withDescriptor); ok {
-			return wd.Descriptor()
-		}
-	}
-	if cie, ok := d.(*compressedImageExtender); ok {
-		if wd, ok := cie.CompressedImageCore.(withDescriptor); ok {
-			return wd.Descriptor()
-		}
-	}
-
 	// If all else fails, compute the descriptor from the individual methods.
 	var (
 		desc v1.Descriptor
@@ -354,23 +331,10 @@ type withUncompressedSize interface {
 // for streaming layers.
 func UncompressedSize(l v1.Layer) (int64, error) {
 	// If the layer implements UncompressedSize itself, return that.
-	if wus, ok := l.(withUncompressedSize); ok {
+	if wus, ok := unwrap(l).(withUncompressedSize); ok {
 		return wus.UncompressedSize()
 	}
 
-	// Otherwise, try to unwrap any partial implementations to see
-	// if the wrapped struct implements UncompressedSize.
-	if ule, ok := l.(*uncompressedLayerExtender); ok {
-		if wus, ok := ule.UncompressedLayer.(withUncompressedSize); ok {
-			return wus.UncompressedSize()
-		}
-	}
-	if cle, ok := l.(*compressedLayerExtender); ok {
-		if wus, ok := cle.CompressedLayer.(withUncompressedSize); ok {
-			return wus.UncompressedSize()
-		}
-	}
-
 	// The layer doesn't implement UncompressedSize, we need to compute it.
 	rc, err := l.Uncompressed()
 	if err != nil {
@@ -380,3 +344,46 @@ func UncompressedSize(l v1.Layer) (int64, error) {
 
 	return io.Copy(ioutil.Discard, rc)
 }
+
+type withExists interface {
+	Exists() (bool, error)
+}
+
+// Exists checks to see if a layer exists. This is a hack to work around the
+// mistakes of the partial package. Don't use this.
+func Exists(l v1.Layer) (bool, error) {
+	// If the layer implements Exists itself, return that.
+	if we, ok := unwrap(l).(withExists); ok {
+		return we.Exists()
+	}
+
+	// The layer doesn't implement Exists, so we hope that calling Compressed()
+	// is enough to trigger an error if the layer does not exist.
+	rc, err := l.Compressed()
+	if err != nil {
+		return false, err
+	}
+	defer rc.Close()
+
+	// We may want to try actually reading a single byte, but if we need to do
+	// that, we should just fix this hack.
+	return true, nil
+}
+
+// Recursively unwrap our wrappers so that we can check for the original implementation.
+// We might want to expose this?
+func unwrap(i interface{}) interface{} {
+	if ule, ok := i.(*uncompressedLayerExtender); ok {
+		return unwrap(ule.UncompressedLayer)
+	}
+	if cle, ok := i.(*compressedLayerExtender); ok {
+		return unwrap(cle.CompressedLayer)
+	}
+	if uie, ok := i.(*uncompressedImageExtender); ok {
+		return unwrap(uie.UncompressedImageCore)
+	}
+	if cie, ok := i.(*compressedImageExtender); ok {
+		return unwrap(cie.CompressedImageCore)
+	}
+	return i
+}
diff --git a/pkg/v1/remote/descriptor.go b/pkg/v1/remote/descriptor.go
index 2e0f9996..a13f01b6 100644
--- a/pkg/v1/remote/descriptor.go
+++ b/pkg/v1/remote/descriptor.go
@@ -402,3 +402,23 @@ func (f *fetcher) headBlob(h v1.Hash) (*http.Response, error) {
 
 	return resp, nil
 }
+
+func (f *fetcher) blobExists(h v1.Hash) (bool, error) {
+	u := f.url("blobs", h.String())
+	req, err := http.NewRequest(http.MethodHead, u.String(), nil)
+	if err != nil {
+		return false, err
+	}
+
+	resp, err := f.Client.Do(req.WithContext(f.context))
+	if err != nil {
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	if err := transport.CheckError(resp, http.StatusOK, http.StatusNotFound); err != nil {
+		return false, err
+	}
+
+	return resp.StatusCode == http.StatusOK, nil
+}
diff --git a/pkg/v1/remote/image.go b/pkg/v1/remote/image.go
index 64472364..71739fee 100644
--- a/pkg/v1/remote/image.go
+++ b/pkg/v1/remote/image.go
@@ -221,6 +221,11 @@ func (rl *remoteImageLayer) Descriptor() (*v1.Descriptor, error) {
 	return partial.BlobDescriptor(rl, rl.digest)
 }
 
+// See partial.Exists.
+func (rl *remoteImageLayer) Exists() (bool, error) {
+	return rl.ri.blobExists(rl.digest)
+}
+
 // LayerByDigest implements partial.CompressedLayer
 func (r *remoteImage) LayerByDigest(h v1.Hash) (partial.CompressedLayer, error) {
 	return &remoteImageLayer{
diff --git a/pkg/v1/remote/layer.go b/pkg/v1/remote/layer.go
index 89b0ede0..1501672d 100644
--- a/pkg/v1/remote/layer.go
+++ b/pkg/v1/remote/layer.go
@@ -43,6 +43,7 @@ func (rl *remoteLayer) Size() (int64, error) {
 	if err != nil {
 		return -1, err
 	}
+	defer resp.Body.Close()
 	return resp.ContentLength, nil
 }
 
@@ -56,6 +57,11 @@ func (rl *remoteLayer) MediaType() (types.MediaType, error) {
 	return types.DockerLayer, nil
 }
 
+// See partial.Exists.
+func (rl *remoteLayer) Exists() (bool, error) {
+	return rl.blobExists(rl.digest)
+}
+
 // Layer reads the given blob reference from a registry as a Layer. A blob
 // reference here is just a punned name.Digest where the digest portion is the
 // digest of the blob to be read and the repository portion is the repo where
diff --git a/pkg/v1/remote/mount.go b/pkg/v1/remote/mount.go
index 2800b330..72899704 100644
--- a/pkg/v1/remote/mount.go
+++ b/pkg/v1/remote/mount.go
@@ -34,6 +34,11 @@ func (ml *MountableLayer) Descriptor() (*v1.Descriptor, error) {
 	return partial.Descriptor(ml.Layer)
 }
 
+// Exists is a hack. See partial.Exists.
+func (ml *MountableLayer) Exists() (bool, error) {
+	return partial.Exists(ml.Layer)
+}
+
 // mountableImage wraps the v1.Layer references returned by the embedded v1.Image
 // in MountableLayer's so that remote.Write might attempt to mount them from their
 // source repository.
diff --git a/pkg/v1/validate/image.go b/pkg/v1/validate/image.go
index 61477218..de9bdda1 100644
--- a/pkg/v1/validate/image.go
+++ b/pkg/v1/validate/image.go
@@ -22,12 +22,13 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
 )
 
 // Image validates that img does not violate any invariants of the image format.
-func Image(img v1.Image) error {
+func Image(img v1.Image, opt ...Option) error {
 	errs := []string{}
-	if err := validateLayers(img); err != nil {
+	if err := validateLayers(img, opt...); err != nil {
 		errs = append(errs, fmt.Sprintf("validating layers: %v", err))
 	}
 
@@ -100,12 +101,18 @@ func validateConfig(img v1.Image) error {
 	return nil
 }
 
-func validateLayers(img v1.Image) error {
+func validateLayers(img v1.Image, opt ...Option) error {
+	o := makeOptions(opt...)
+
 	layers, err := img.Layers()
 	if err != nil {
 		return err
 	}
 
+	if o.fast {
+		return layersExist(layers)
+	}
+
 	digests := []v1.Hash{}
 	diffids := []v1.Hash{}
 	udiffids := []v1.Hash{}
@@ -249,3 +256,22 @@ func validateManifest(img v1.Image) error {
 
 	return nil
 }
+
+func layersExist(layers []v1.Layer) error {
+	errs := []string{}
+	for _, layer := range layers {
+		ok, err := partial.Exists(layer)
+		if err != nil {
+			errs = append(errs, err.Error())
+		}
+		if !ok {
+			errs = append(errs, "layer does not exist")
+		}
+	}
+
+	if len(errs) != 0 {
+		return errors.New(strings.Join(errs, "\n"))
+	}
+
+	return nil
+}
diff --git a/pkg/v1/validate/index.go b/pkg/v1/validate/index.go
index 688e0f1d..13e1e2af 100644
--- a/pkg/v1/validate/index.go
+++ b/pkg/v1/validate/index.go
@@ -27,10 +27,10 @@ import (
 )
 
 // Index validates that idx does not violate any invariants of the index format.
-func Index(idx v1.ImageIndex) error {
+func Index(idx v1.ImageIndex, opt ...Option) error {
 	errs := []string{}
 
-	if err := validateChildren(idx); err != nil {
+	if err := validateChildren(idx, opt...); err != nil {
 		errs = append(errs, fmt.Sprintf("validating children: %v", err))
 	}
 
@@ -48,7 +48,7 @@ type withLayer interface {
 	Layer(v1.Hash) (v1.Layer, error)
 }
 
-func validateChildren(idx v1.ImageIndex) error {
+func validateChildren(idx v1.ImageIndex, opt ...Option) error {
 	manifest, err := idx.IndexManifest()
 	if err != nil {
 		return err
@@ -62,7 +62,7 @@ func validateChildren(idx v1.ImageIndex) error {
 			if err != nil {
 				return err
 			}
-			if err := Index(idx); err != nil {
+			if err := Index(idx, opt...); err != nil {
 				errs = append(errs, fmt.Sprintf("failed to validate index Manifests[%d](%s): %v", i, desc.Digest, err))
 			}
 			if err := validateMediaType(idx, desc.MediaType); err != nil {
@@ -73,7 +73,7 @@ func validateChildren(idx v1.ImageIndex) error {
 			if err != nil {
 				return err
 			}
-			if err := Image(img); err != nil {
+			if err := Image(img, opt...); err != nil {
 				errs = append(errs, fmt.Sprintf("failed to validate image Manifests[%d](%s): %v", i, desc.Digest, err))
 			}
 			if err := validateMediaType(img, desc.MediaType); err != nil {
@@ -86,7 +86,7 @@ func validateChildren(idx v1.ImageIndex) error {
 				if err != nil {
 					return fmt.Errorf("failed to get layer Manifests[%d]: %v", i, err)
 				}
-				if err := Layer(layer); err != nil {
+				if err := Layer(layer, opt...); err != nil {
 					lerr := fmt.Sprintf("failed to validate layer Manifests[%d](%s): %v", i, desc.Digest, err)
 					if desc.MediaType.IsDistributable() {
 						errs = append(errs, lerr)
diff --git a/pkg/v1/validate/layer.go b/pkg/v1/validate/layer.go
index 24526555..9acbfc27 100644
--- a/pkg/v1/validate/layer.go
+++ b/pkg/v1/validate/layer.go
@@ -26,11 +26,24 @@ import (
 	"strings"
 
 	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
 )
 
 // Layer validates that the values return by its methods are consistent with the
 // contents returned by Compressed and Uncompressed.
-func Layer(layer v1.Layer) error {
+func Layer(layer v1.Layer, opt ...Option) error {
+	o := makeOptions(opt...)
+	if o.fast {
+		ok, err := partial.Exists(layer)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			return fmt.Errorf("layer does not exist")
+		}
+		return nil
+	}
+
 	cl, err := computeLayer(layer)
 	if err != nil {
 		return err
diff --git a/pkg/v1/validate/options.go b/pkg/v1/validate/options.go
new file mode 100644
index 00000000..a6bf2dcc
--- /dev/null
+++ b/pkg/v1/validate/options.go
@@ -0,0 +1,37 @@
+// Copyright 2021 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package validate
+
+// Option is a functional option for validate.
+type Option func(*options)
+
+type options struct {
+	fast bool
+}
+
+func makeOptions(opts ...Option) options {
+	opt := options{
+		fast: false,
+	}
+	for _, o := range opts {
+		o(&opt)
+	}
+	return opt
+}
+
+// Fast causes validate to skip reading and digesting layer bytes.
+func Fast(o *options) {
+	o.fast = true
+}


Test patch:
diff --git a/pkg/v1/layout/image_test.go b/pkg/v1/layout/image_test.go
index 26b514ba..139c56b2 100644
--- a/pkg/v1/layout/image_test.go
+++ b/pkg/v1/layout/image_test.go
@@ -19,6 +19,7 @@ import (
 	"testing"
 
 	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
 	"github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/google/go-containerregistry/pkg/v1/validate"
 )
@@ -99,6 +100,12 @@ func TestImage(t *testing.T) {
 	if got, want := mediaType, types.DockerLayer; got != want {
 		t.Fatalf("MediaType(); want: %q got: %q", want, got)
 	}
+
+	if ok, err := partial.Exists(layers[0]); err != nil {
+		t.Fatal(err)
+	} else if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
 }
 
 func TestImageWithEmptyHash(t *testing.T) {
diff --git a/pkg/v1/partial/compressed_test.go b/pkg/v1/partial/compressed_test.go
index 72d7c013..78915850 100644
--- a/pkg/v1/partial/compressed_test.go
+++ b/pkg/v1/partial/compressed_test.go
@@ -79,6 +79,14 @@ func TestRemote(t *testing.T) {
 	if diff := cmp.Diff(d, m.Layers[0].Digest); diff != "" {
 		t.Errorf("mismatched digest: %v", diff)
 	}
+
+	ok, err := partial.Exists(layer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
 }
 
 type noDiffID struct {
diff --git a/pkg/v1/partial/uncompressed_test.go b/pkg/v1/partial/uncompressed_test.go
index fe60b239..28852c25 100644
--- a/pkg/v1/partial/uncompressed_test.go
+++ b/pkg/v1/partial/uncompressed_test.go
@@ -214,4 +214,21 @@ func TestUncompressed(t *testing.T) {
 	if _, err := partial.Descriptor(img); err != nil {
 		t.Fatalf("partial.Descriptor: %v", err)
 	}
+
+	layers, err := img.Layers()
+	if err != nil {
+		t.Fatal(err)
+	}
+	layer, err := partial.UncompressedToLayer(&fastpathLayer{layers[0]})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ok, err := partial.Exists(layer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
 }
diff --git a/pkg/v1/partial/with_test.go b/pkg/v1/partial/with_test.go
index 139c72bd..7796bd94 100644
--- a/pkg/v1/partial/with_test.go
+++ b/pkg/v1/partial/with_test.go
@@ -203,6 +203,10 @@ func (l *fastpathLayer) UncompressedSize() (int64, error) {
 	return 100, nil
 }
 
+func (l *fastpathLayer) Exists() (bool, error) {
+	return true, nil
+}
+
 func TestUncompressedSize(t *testing.T) {
 	randLayer, err := random.Layer(1024, types.DockerLayer)
 	if err != nil {
@@ -217,3 +221,26 @@ func TestUncompressedSize(t *testing.T) {
 		t.Errorf("UncompressedSize() = %d != %d", got, want)
 	}
 }
+
+func TestExists(t *testing.T) {
+	randLayer, err := random.Layer(1024, types.DockerLayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fpl := &fastpathLayer{randLayer}
+	ok, err := partial.Exists(fpl)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
+
+	ok, err = partial.Exists(randLayer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
+}
diff --git a/pkg/v1/remote/layer_test.go b/pkg/v1/remote/layer_test.go
index 3dcd3998..a2f56bd4 100644
--- a/pkg/v1/remote/layer_test.go
+++ b/pkg/v1/remote/layer_test.go
@@ -78,6 +78,12 @@ func TestRemoteLayer(t *testing.T) {
 	if err := validate.Layer(got); err != nil {
 		t.Errorf("validate.Layer: %v", err)
 	}
+
+	if ok, err := partial.Exists(got); err != nil {
+		t.Fatal(err)
+	} else if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
 }
 
 func TestRemoteLayerDescriptor(t *testing.T) {
@@ -134,4 +140,9 @@ func TestRemoteLayerDescriptor(t *testing.T) {
 	if got, want := desc.URLs[0], "example.com"; got != want {
 		t.Errorf("layer[0].urls[0] = %s != %s", got, want)
 	}
+	if ok, err := partial.Exists(layers[0]); err != nil {
+		t.Fatal(err)
+	} else if got, want := ok, true; got != want {
+		t.Errorf("Exists() = %t != %t", got, want)
+	}
 }