Repository: oras-project/oras
Pull request #312 (2021-09-14 13:47:41)

Feat: minimal dep on containerd
Does not require a dependency on oras-project/containerd, moved everything it needs to build over.

It compiles and runs, but I haven't tested discover yet, I need some help with that cc: @sajayantony

Give it a shot with:
```
curl https://raw.githubusercontent.com/juliusl/oras/juliusl/prototype-3/scripts/get-oras.sh | REPO='juliusl/oras' TAG='v0.11.15-alpha' sh;. ./install-oras.sh
```

juliusl: Sample output from oras from testing

```
# output from ./oras push 
Uploading 4eae2a2370b5 runc
Pushed localhost:5000/runc:v1

# output from ./oras push w/ --artifact-type --subject
Digest: sha256:1f853ca69214faeed10d055067b4439949a342a0a6f929d122526b53a59883bc
Uploading c71975642779 sbom.json
Pushed localhost:5000/runc

# output from ./oras push w/ --artifact-type --subject
Digest: sha256:2edf9ba4dff0203f1b26264bdf81948e86d4879a4de06f050052f471278b421d
Uploading 655032a47bb3 signature.json
Pushed localhost:5000/runc

# output from discover -o tree --artifact-type=sbom/example
Digest: sha256:81cde7efdb78ca7d6de1aabccf99e56b34bb33c84ce3b5249ce8e4938f37e05b
localhost:5000/runc:v1
└── sbom/example
    └── sha256:2edf9ba4dff0203f1b26264bdf81948e86d4879a4de06f050052f471278b421d

# output from oras pull @(oras discover -o json) 
Downloaded c71975642779 sbom.json
Pulled localhost:5000/runc@sha256:2edf9ba4dff0203f1b26264bdf81948e86d4879a4de06f050052f471278b421d
Digest: sha256:2edf9ba4dff0203f1b26264bdf81948e86d4879a4de06f050052f471278b421d
```
sajayantony: Please fix DCO and let's get this merged - 
`git commit --amend --no-edit --signoff` 
juliusl: @sajayantony  done
juliusl: @sajayantony  oops the license got deleted not sure why 

Patch:
diff --git a/LICENSE b/LICENSE
index 2107107..236805a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -19,3 +19,4 @@
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE
+    
\ No newline at end of file
diff --git a/cmd/oras/discover.go b/cmd/oras/discover.go
index 73d9b7d..c6a61cd 100644
--- a/cmd/oras/discover.go
+++ b/cmd/oras/discover.go
@@ -12,6 +12,7 @@ import (
 
 	"github.com/containerd/containerd/reference"
 	"github.com/containerd/containerd/remotes"
+	orasdocker "github.com/deislabs/oras/pkg/remotes/docker"
 	"github.com/need-being/go-tree"
 	digest "github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
@@ -72,10 +73,15 @@ func runDiscover(opts discoverOptions) error {
 		ctx = ctxo.WithLoggerDiscarded(ctx)
 	}
 
-	resolver := newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
+	resolver, dopts := newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
+
+	discoverer, err := orasdocker.WithDiscover(opts.targetRef, resolver, dopts)
+	if err != nil {
+		return err
+	}
 
 	rootNode := tree.New(opts.targetRef)
-	desc, refs, err := getAllReferences(ctx, resolver, opts.targetRef, opts.artifactType, rootNode, opts.outputType == "tree")
+	desc, refs, err := getAllReferences(ctx, discoverer, opts.targetRef, opts.artifactType, rootNode, opts.outputType == "tree")
 	if err != nil {
 		return err
 	}
diff --git a/cmd/oras/pull.go b/cmd/oras/pull.go
index a63d453..ef34100 100644
--- a/cmd/oras/pull.go
+++ b/cmd/oras/pull.go
@@ -8,6 +8,7 @@ import (
 	"github.com/deislabs/oras/pkg/content"
 	ctxo "github.com/deislabs/oras/pkg/context"
 	"github.com/deislabs/oras/pkg/oras"
+	"github.com/deislabs/oras/pkg/remotes/docker"
 
 	"github.com/containerd/containerd/reference"
 	"github.com/sirupsen/logrus"
@@ -99,7 +100,13 @@ func runPull(opts pullOptions) error {
 		opts.allowedMediaTypes = []string{content.DefaultBlobMediaType, content.DefaultBlobDirMediaType}
 	}
 
-	resolver := newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
+	resolver, ropts := newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
+
+	resolver, err := docker.WithDiscover(opts.targetRef, resolver, ropts)
+	if err != nil {
+		return err
+	}
+
 	store := content.NewFileStore(opts.output)
 	defer store.Close()
 	store.DisableOverwrite = opts.keepOldFiles
diff --git a/cmd/oras/push.go b/cmd/oras/push.go
index 74e6aaf..c83bfa4 100644
--- a/cmd/oras/push.go
+++ b/cmd/oras/push.go
@@ -7,12 +7,13 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/containerd/containerd/remotes"
+	"github.com/containerd/containerd/remotes/docker"
 	iresolver "github.com/deislabs/oras/internal/resolver"
 	"github.com/deislabs/oras/pkg/content"
 	ctxo "github.com/deislabs/oras/pkg/context"
 	"github.com/deislabs/oras/pkg/oras"
-
-	"github.com/containerd/containerd/remotes"
+	orasDocker "github.com/deislabs/oras/pkg/remotes/docker"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -103,33 +104,40 @@ func runPush(opts pushOptions) error {
 	}
 
 	// specify resolver
-	var resolver remotes.Resolver
+	var (
+		resolver remotes.Resolver
+		ropts    *docker.ResolverOptions
+		err      error
+	)
 	if opts.dryRun {
 		resolver = iresolver.Dummy()
 		fmt.Println("Entered dry-run mode")
 	} else {
-		resolver = newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
+		resolver, ropts = newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
 	}
 
+	// load files
+	var (
+		annotations map[string]map[string]string
+		store       = content.NewFileStore("")
+	)
+
 	// bake artifact
 	var pushOpts []oras.PushOpt
 	if opts.artifactType != "" {
-		refResolver := resolver
-		if iresolver.IsDummy(resolver) {
-			refResolver = newResolver(opts.username, opts.password, opts.insecure, opts.plainHTTP, opts.configs...)
+		resolver, err = orasDocker.WithDiscover(opts.artifactRefs, resolver, orasDocker.NewOpts(ropts))
+		if err != nil {
+			return err
 		}
-		manifest, err := loadReference(ctx, refResolver, opts.artifactRefs)
+
+		manifest, err := loadReference(ctx, resolver, opts.artifactRefs)
 		if err != nil {
 			return err
 		}
+
 		pushOpts = append(pushOpts, oras.AsArtifact(opts.artifactType, manifest))
 	}
 
-	// load files
-	var (
-		annotations map[string]map[string]string
-		store       = content.NewFileStore("")
-	)
 	defer store.Close()
 	if opts.manifestAnnotations != "" {
 		if err := decodeJSON(opts.manifestAnnotations, &annotations); err != nil {
diff --git a/cmd/oras/resolver.go b/cmd/oras/resolver.go
index a9c5f1a..d6050af 100644
--- a/cmd/oras/resolver.go
+++ b/cmd/oras/resolver.go
@@ -13,9 +13,8 @@ import (
 	"github.com/containerd/containerd/remotes/docker"
 )
 
-func newResolver(username, password string, insecure bool, plainHTTP bool, configs ...string) remotes.Resolver {
-
-	opts := docker.ResolverOptions{
+func newResolver(username, password string, insecure bool, plainHTTP bool, configs ...string) (remotes.Resolver, *docker.ResolverOptions) {
+	opts := &docker.ResolverOptions{
 		PlainHTTP: plainHTTP,
 	}
 
@@ -33,7 +32,7 @@ func newResolver(username, password string, insecure bool, plainHTTP bool, confi
 		opts.Credentials = func(hostName string) (string, string, error) {
 			return username, password, nil
 		}
-		return docker.NewResolver(opts)
+		return docker.NewResolver(*opts), opts
 	}
 	cli, err := auth.NewClient(configs...)
 	if err != nil {
@@ -42,7 +41,7 @@ func newResolver(username, password string, insecure bool, plainHTTP bool, confi
 	resolver, err := cli.Resolver(context.Background(), client, plainHTTP)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "WARNING: Error loading resolver: %v\n", err)
-		resolver = docker.NewResolver(opts)
+		resolver = docker.NewResolver(*opts)
 	}
-	return resolver
+	return resolver, opts
 }
diff --git a/go.mod b/go.mod
index 50a10ac..47d7877 100644
--- a/go.mod
+++ b/go.mod
@@ -5,19 +5,17 @@ go 1.16
 replace (
 	// WARNING! Do NOT replace these without also replacing their lines in the `require` stanza below.
 	// These `replace` stanzas are IGNORED when this is imported as a library
-	github.com/containerd/containerd => github.com/oras-project/containerd v1.5.0-beta.4.0.20210914182246-c90d5cff6817
-	github.com/containerd/containerd/api => github.com/oras-project/containerd/api v0.0.0-20210914182246-c90d5cff6817
-	// This one keeps switching versions
-	github.com/oras-project/artifacts-spec => github.com/oras-project/artifacts-spec v0.0.0-20210910233110-813953a626ae
 	github.com/docker/distribution => github.com/docker/distribution v0.0.0-20191216044856-a8371794149d
 	github.com/docker/docker => github.com/moby/moby v17.12.0-ce-rc1.0.20200618181300-9dc6525e6118+incompatible
+
+	// This one keeps switching versions
+	github.com/oras-project/artifacts-spec => github.com/oras-project/artifacts-spec v0.0.0-20210910233110-813953a626ae
 )
 
 require (
 	github.com/containerd/containerd v1.5.1
-	github.com/containerd/containerd/api v1.5.0-beta.3 // indirect
 	github.com/docker/cli v20.10.5+incompatible
-	github.com/docker/distribution v0.0.0-20191216044856-a8371794149d
+	github.com/docker/distribution v2.7.1+incompatible
 	github.com/docker/docker v17.12.0-ce-rc1.0.20200618181300-9dc6525e6118+incompatible
 	github.com/docker/docker-credential-helpers v0.6.3 // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
@@ -32,5 +30,7 @@ require (
 	github.com/spf13/cobra v1.1.3
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	google.golang.org/grpc v1.38.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 1987c21..f93a054 100644
--- a/go.sum
+++ b/go.sum
@@ -23,43 +23,41 @@ cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiy
 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=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/AdaLogics/go-fuzz-headers v0.0.0-20210715213245-6c3934b029d8/go.mod h1:CzsSbkDixRphAF5hS6wbMKq0eI6ccJRb7/A0M6JBnwg=
 github.com/Azure/azure-sdk-for-go v16.2.1+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
-github.com/Azure/go-ansiterm v0.0.0-20210608223527-2377c96fe795/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
-github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
-github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
 github.com/Azure/go-autorest v10.8.1+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
 github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
 github.com/Azure/go-autorest/autorest v0.11.1/go.mod h1:JFgpikqFJ/MleTTxwepExTKnFUKKszPS8UavbQYUMuw=
-github.com/Azure/go-autorest/autorest v0.11.18/go.mod h1:dSiJPy22c3u0OtOKDNttNgqpNFY/GeWa7GH/Pz56QRA=
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 github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
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 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
@@ -69,16 +67,13 @@ github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuy
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
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@@ -161,6 +193,7 @@ github.com/containernetworking/cni v0.8.0/go.mod h1:LGwApLUm2FpoOfxTDEeq8T9ipbpZ
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@@ -171,18 +204,16 @@ github.com/coreos/go-iptables v0.5.0/go.mod h1:/mVI274lEDI2ns62jHCDnCyBF9Iwsmeka
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@@ -204,6 +235,7 @@ github.com/docker/docker-credential-helpers v0.6.3 h1:zI2p9+1NQYdnG6sMU26EX4aVGl
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@@ -222,21 +254,17 @@ github.com/emicklei/go-restful v2.9.5+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT
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@@ -245,30 +273,28 @@ github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2
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@@ -279,8 +305,6 @@ github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4er
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@@ -301,23 +325,17 @@ github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QD
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@@ -638,12 +635,15 @@ github.com/vishvananda/netlink v1.1.1-0.20201029203352-d40f9887b852/go.mod h1:tw
 github.com/vishvananda/netns v0.0.0-20180720170159-13995c7128cc/go.mod h1:ZjcWmFBXmLKZu9Nxj3WKYEafiSqer2rnvPr0en9UNpI=
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 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 github.com/yvasiyarov/go-metrics v0.0.0-20140926110328-57bccd1ccd43 h1:+lm10QQTNSBd8DVTNGHx7o/IKu9HYDvLMffDhbyLccI=
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@@ -653,50 +653,18 @@ github.com/yvasiyarov/newrelic_platform_go v0.0.0-20140908184405-b21fdbd4370f/go
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
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-go.etcd.io/bbolt v1.3.6/go.mod h1:qXsaaIqmgQH0T+OPdb99Bf+PKfBBQVAdyD6TY9G8XM4=
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-go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
+golang.org/x/crypto v0.0.0-20171113213409-9f005a07e0d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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@@ -704,13 +672,11 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
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@@ -735,7 +701,6 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -744,7 +709,6 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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-golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -767,6 +731,7 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -774,19 +739,13 @@ golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
-golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
-golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
-golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
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 golang.org/x/net v0.0.0-20201006153459-a7d1128ccaa0/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
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 golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
-golang.org/x/net v0.0.0-20210520170846-37e1c6afe023 h1:ADo5wSpq2gqaCGQWzk7S5vd//0iyyLeAratkEoG5dLE=
-golang.org/x/net v0.0.0-20210520170846-37e1c6afe023/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -798,8 +757,8 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20201207232520-09787c993a3a h1:DcqTD9SDLc+1P/r1EmRBwnVsrOwW+kk2vWf9n+1sGhs=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -816,6 +775,8 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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+golang.org/x/sys v0.0.0-20190522044717-8097e1b27ff5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606203320-7fc4e5ec1444/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -823,10 +784,13 @@ golang.org/x/sys v0.0.0-20190616124812-15dcb6c0061f/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191115151921-52ab43148777/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -844,36 +808,23 @@ golang.org/x/sys v0.0.0-20200217220822-9197077df867/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -881,16 +832,11 @@ golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -911,7 +857,6 @@ golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgw
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@@ -930,7 +875,6 @@ golang.org/x/tools v0.0.0-20200224181240-023911ca70b2/go.mod h1:TB2adYChydJhpapK
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@@ -958,6 +902,7 @@ google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRn
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@@ -972,32 +917,23 @@ google.golang.org/genproto v0.0.0-20200204135345-fa8e72b47b90/go.mod h1:GmwEX6Z4
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@@ -1011,17 +947,13 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
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@@ -1031,12 +963,12 @@ gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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@@ -1045,9 +977,6 @@ gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
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@@ -1059,32 +988,37 @@ honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWh
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-k8s.io/cri-api v0.22.0/go.mod h1:mj5DGUtElRyErU5AZ8EM0ahxbElYsaLAMTPhLPQ40Eg=
+k8s.io/cri-api v0.20.6/go.mod h1:ew44AjNXwyn1s0U4xCKGodU7J1HzBeZ1MpGrpa5r8Yc=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
 k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
-k8s.io/klog/v2 v2.9.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
 k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd/go.mod h1:WOJ3KddDSol4tAGcJo0Tvi+dK12EcqSLqcWsryKMpfM=
-k8s.io/kube-openapi v0.0.0-20210421082810-95288971da7e/go.mod h1:vHXdDvt9+2spS2Rx9ql3I8tycm3H9FDfdUoIuKCefvw=
+k8s.io/kubernetes v1.13.0/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
 k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
-k8s.io/utils v0.0.0-20210707171843-4b05e18ac7d9/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 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 v0.0.14/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
-sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.22/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.15/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
-sigs.k8s.io/structured-merge-diff/v4 v4.1.2/go.mod h1:j/nl6xW8vLS49O8YvXW1ocPhZawJtm+Yrr7PPRQ0Vg4=
+sigs.k8s.io/structured-merge-diff/v4 v4.0.3/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
diff --git a/internal/resolver/dummy.go b/internal/resolver/dummy.go
index 1389e88..7895e2d 100644
--- a/internal/resolver/dummy.go
+++ b/internal/resolver/dummy.go
@@ -57,11 +57,8 @@ func (r *dummyResolver) Pusher(ctx context.Context, ref string) (remotes.Pusher,
 	}), nil
 }
 
-// Discoverer returns a new discoverer for the provided reference
-func (r *dummyResolver) Discoverer(ctx context.Context, ref string) (remotes.Discoverer, error) {
-	return remotes.DiscovererFunc(func(ctx context.Context, desc ocispec.Descriptor, artifactType string) ([]artifactspec.Descriptor, error) {
-		return nil, errors.Wrap(errdefs.ErrNotFound, "dummy resolver")
-	}), nil
+func (r *dummyResolver) Discover(ctx context.Context, resolver remotes.Resolver, ref, artifactType string) (ocispec.Descriptor, []artifactspec.Descriptor, error) {
+	return ocispec.Descriptor{}, nil, errors.Wrap(errdefs.ErrNotFound, "dummy resolver")
 }
 
 type dummyWriter struct {
diff --git a/pkg/images/handler.go b/pkg/images/handler.go
new file mode 100644
index 0000000..cf7495e
--- /dev/null
+++ b/pkg/images/handler.go
@@ -0,0 +1,47 @@
+package images
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/containerd/containerd/content"
+	"github.com/containerd/containerd/images"
+	v1 "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+)
+
+// AppendArtifactsHandler will append artifacts desc to descs
+func AppendArtifactsHandler(provider content.Provider) images.Handler {
+	return images.HandlerFunc(func(ctx context.Context, desc v1.Descriptor) ([]v1.Descriptor, error) {
+		descs := make([]v1.Descriptor, 0)
+
+		switch desc.MediaType {
+
+		case artifactspec.MediaTypeArtifactManifest:
+			p, err := content.ReadBlob(ctx, provider, desc)
+			if err != nil {
+				return nil, err
+			}
+
+			artifact := &artifactspec.Manifest{}
+			if err := json.Unmarshal(p, artifact); err != nil {
+				return nil, err
+			}
+
+			appendDesc := func(artifacts ...artifactspec.Descriptor) {
+				for _, desc := range artifacts {
+					descs = append(descs, v1.Descriptor{
+						MediaType:   desc.MediaType,
+						Digest:      desc.Digest,
+						Size:        desc.Size,
+						URLs:        desc.URLs,
+						Annotations: desc.Annotations,
+					})
+				}
+			}
+
+			appendDesc(artifact.Blobs...)
+		}
+		return descs, nil
+	})
+}
diff --git a/pkg/oras/discover.go b/pkg/oras/discover.go
index 08eb123..3434041 100644
--- a/pkg/oras/discover.go
+++ b/pkg/oras/discover.go
@@ -2,6 +2,7 @@ package oras
 
 import (
 	"context"
+	"errors"
 
 	"github.com/containerd/containerd/remotes"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
@@ -10,12 +11,15 @@ import (
 
 // Discover discovers artifacts referencing the specified artifact
 func Discover(ctx context.Context, resolver remotes.Resolver, ref, artifactType string) (ocispec.Descriptor, []artifactspec.Descriptor, error) {
-	_, desc, err := resolver.Resolve(ctx, ref)
-	if err != nil {
-		return ocispec.Descriptor{}, nil, err
+	discoverer, ok := resolver.(interface {
+		Discover(ctx context.Context, desc ocispec.Descriptor, artifactType string) ([]artifactspec.Descriptor, error)
+	})
+
+	if !ok {
+		return ocispec.Descriptor{}, nil, errors.New("not implemented")
 	}
 
-	discoverer, err := resolver.Discoverer(ctx, ref)
+	_, desc, err := resolver.Resolve(ctx, ref)
 	if err != nil {
 		return ocispec.Descriptor{}, nil, err
 	}
diff --git a/pkg/oras/pull.go b/pkg/oras/pull.go
index 70cd6f3..d278c1a 100644
--- a/pkg/oras/pull.go
+++ b/pkg/oras/pull.go
@@ -4,12 +4,12 @@ import (
 	"context"
 	"sync"
 
-	orascontent "github.com/deislabs/oras/pkg/content"
-
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/images"
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/remotes"
+	orascontent "github.com/deislabs/oras/pkg/content"
+	orasimages "github.com/deislabs/oras/pkg/images"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -72,6 +72,7 @@ func fetchContent(ctx context.Context, fetcher remotes.Fetcher, desc ocispec.Des
 		remotes.FetchHandler(store, fetcher),
 		picker,
 		images.ChildrenHandler(store),
+		orasimages.AppendArtifactsHandler(store),
 	)
 	handlers = append(handlers, opts.callbackHandlers...)
 
diff --git a/pkg/oras/push.go b/pkg/oras/push.go
index ff5b3ca..49b9578 100644
--- a/pkg/oras/push.go
+++ b/pkg/oras/push.go
@@ -7,6 +7,8 @@ import (
 	"github.com/containerd/containerd/images"
 	"github.com/containerd/containerd/remotes"
 	artifact "github.com/deislabs/oras/pkg/artifact"
+	orasimages "github.com/deislabs/oras/pkg/images"
+	"github.com/deislabs/oras/pkg/remotes/docker"
 	digest "github.com/opencontainers/go-digest"
 	specs "github.com/opencontainers/image-spec/specs-go"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
@@ -42,6 +44,8 @@ func Push(ctx context.Context, resolver remotes.Resolver, ref string, provider c
 		return ocispec.Descriptor{}, err
 	}
 
+	opt.baseHandlers = append(opt.baseHandlers, orasimages.AppendArtifactsHandler(store))
+
 	var wrapper func(images.Handler) images.Handler
 	if len(opt.baseHandlers) > 0 {
 		wrapper = func(h images.Handler) images.Handler {
@@ -49,7 +53,7 @@ func Push(ctx context.Context, resolver remotes.Resolver, ref string, provider c
 		}
 	}
 
-	if err := remotes.PushContent(ctx, pusher, desc, store, nil, nil, wrapper); err != nil {
+	if err := docker.PushContent(ctx, pusher, desc, store, nil, nil, wrapper); err != nil {
 		return ocispec.Descriptor{}, err
 	}
 	return desc, nil
diff --git a/pkg/remotes/docker/artifacts.go b/pkg/remotes/docker/artifacts.go
new file mode 100644
index 0000000..5b68991
--- /dev/null
+++ b/pkg/remotes/docker/artifacts.go
@@ -0,0 +1,266 @@
+package docker
+
+import (
+	"context"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/containerd/containerd/content"
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/remotes"
+	"github.com/containerd/containerd/remotes/docker"
+	remoteserrors "github.com/containerd/containerd/remotes/errors"
+	"github.com/opencontainers/go-digest"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+func (d *dockerDiscoverer) Pusher(ctx context.Context, ref string) (remotes.Pusher, error) {
+	d.reference = ref
+	return d, nil
+}
+
+func (d *dockerDiscoverer) Push(ctx context.Context, desc ocispec.Descriptor) (content.Writer, error) {
+	switch desc.MediaType {
+	case artifactspec.MediaTypeArtifactManifest:
+		h, err := d.filterHosts(docker.HostCapabilityPush)
+		if err != nil {
+			return nil, err
+		}
+
+		if len(h) == 0 {
+			return nil, errors.New("no host with push")
+		}
+
+		host := h[0]
+
+		err = d.CheckManifest(ctx, host, desc)
+		if err != nil {
+			return nil, err
+		}
+
+		return d.PreparePutManifest(ctx, host, desc)
+	}
+
+	pusher, err := d.Resolver.Pusher(ctx, d.reference)
+	if err != nil {
+		return nil, err
+	}
+
+	return pusher.Push(ctx, desc)
+}
+
+func (d *dockerDiscoverer) PreparePutManifest(ctx context.Context, host docker.RegistryHost, desc ocispec.Descriptor) (content.Writer, error) {
+	d.tracker.SetStatus(d.reference, docker.Status{
+		Status: content.Status{
+			Ref:       d.reference,
+			Total:     desc.Size,
+			Expected:  desc.Digest,
+			StartedAt: time.Now(),
+		},
+	})
+
+	req := d.request(host, http.MethodPut, "manifests", desc.Digest.String())
+	if req == nil {
+		return nil, errors.New("not implemented")
+	}
+
+	req.header.Set("Content-Type", desc.MediaType)
+
+	pr, pw := io.Pipe()
+	respC := make(chan response, 1)
+	body := ioutil.NopCloser(pr)
+
+	req.body = func() (io.ReadCloser, error) {
+		if body == nil {
+			return nil, errors.New("retry request, cannot reset the stream")
+		}
+
+		readout := body
+		body = nil
+		return readout, nil
+	}
+	req.size = desc.Size
+
+	go func() {
+		defer close(respC)
+		resp, err := req.doWithRetries(ctx, nil)
+		if err != nil {
+			respC <- response{err: err}
+			pr.CloseWithError(err)
+			return
+		}
+
+		switch resp.StatusCode {
+		case http.StatusOK, http.StatusCreated, http.StatusNoContent:
+		default:
+			err := remoteserrors.NewUnexpectedStatusErr(resp)
+			pr.CloseWithError(err)
+		}
+		respC <- response{Response: resp}
+	}()
+
+	return &artifactsManifest{
+		ref:       d.reference,
+		expected:  desc.Digest,
+		pipe:      pw,
+		responseC: respC,
+		tracker:   d.tracker,
+	}, nil
+}
+
+func (d *dockerDiscoverer) CheckManifest(ctx context.Context, host docker.RegistryHost, desc ocispec.Descriptor) error {
+	// Check if the manifest exists
+	req := d.request(host, http.MethodHead, "manifests", desc.Digest.String())
+	if req == nil {
+		return errors.New("not implemented")
+	}
+
+	req.header.Set("Accept", desc.MediaType)
+
+	resp, err := req.doWithRetries(ctx, nil)
+	if err != nil {
+		if !errors.Is(err, docker.ErrInvalidAuthorization) {
+			return err
+		}
+	} else {
+		if resp.StatusCode == http.StatusOK && resp.Header.Get("Docker-Content-Digest") == desc.Digest.String() {
+			d.tracker.SetStatus(d.reference, docker.Status{
+				Committed: true,
+				Status: content.Status{
+					Ref:    d.reference,
+					Total:  desc.Size,
+					Offset: desc.Size,
+				}})
+
+			return errdefs.ErrAlreadyExists
+		} else if resp.StatusCode != http.StatusNotFound {
+			err := remoteserrors.NewUnexpectedStatusErr(resp)
+			resp.Body.Close()
+			return err
+		}
+	}
+
+	return nil
+}
+
+type response struct {
+	*http.Response
+	err error
+}
+
+type artifactsManifest struct {
+	ref       string
+	expected  digest.Digest
+	pipe      *io.PipeWriter
+	tracker   docker.StatusTracker
+	responseC <-chan response
+}
+
+func (pw *artifactsManifest) Write(p []byte) (n int, err error) {
+	status, err := pw.tracker.GetStatus(pw.ref)
+	if err != nil {
+		return n, err
+	}
+	n, err = pw.pipe.Write(p)
+	status.Offset += int64(n)
+	status.UpdatedAt = time.Now()
+	pw.tracker.SetStatus(pw.ref, status)
+	return
+}
+
+func (pw *artifactsManifest) Close() error {
+	return pw.pipe.Close()
+}
+
+func (pw *artifactsManifest) Status() (content.Status, error) {
+	status, err := pw.tracker.GetStatus(pw.ref)
+	if err != nil {
+		return content.Status{}, err
+	}
+	return status.Status, nil
+
+}
+
+func (pw *artifactsManifest) Digest() digest.Digest {
+	return pw.expected
+}
+
+func (pw *artifactsManifest) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error {
+	// Check whether read has already thrown an error
+	if _, err := pw.pipe.Write([]byte{}); err != nil && err != io.ErrClosedPipe {
+		return errors.Wrap(err, "pipe error before commit")
+	}
+
+	if err := pw.pipe.Close(); err != nil {
+		return err
+	}
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case resp := <-pw.responseC:
+		if resp.err != nil {
+			return resp.err
+		}
+		defer resp.Response.Body.Close()
+
+		// 201 is specified return status, some registries return
+		// 200, 202 or 204.
+		switch resp.StatusCode {
+		case http.StatusOK, http.StatusCreated, http.StatusNoContent, http.StatusAccepted:
+		default:
+			return remoteserrors.NewUnexpectedStatusErr(resp.Response)
+		}
+
+		status, err := pw.tracker.GetStatus(pw.ref)
+		if err != nil {
+			return errors.Wrap(err, "failed to get status")
+		}
+
+		if size > 0 && size != status.Offset {
+			return errors.Errorf("unexpected size %d, expected %d", status.Offset, size)
+		}
+
+		if expected == "" {
+			expected = status.Expected
+		}
+
+		actual, err := digest.Parse(resp.Header.Get("Docker-Content-Digest"))
+		if err != nil {
+			return errors.Wrap(err, "invalid content digest in response")
+		}
+
+		if actual != expected {
+			return errors.Errorf("got digest %s, expected %s", actual, expected)
+		}
+
+		status.Committed = true
+		status.UpdatedAt = time.Now()
+		pw.tracker.SetStatus(pw.ref, status)
+	}
+
+	return nil
+}
+
+func (pw *artifactsManifest) Truncate(size int64) error {
+
+	return errors.New("cannot truncate remote upload")
+}
+
+func requestWithMountFrom(req *request, mount, from string) *request {
+	creq := *req
+
+	sep := "?"
+	if strings.Contains(creq.path, sep) {
+		sep = "&"
+	}
+
+	creq.path = creq.path + sep + "mount=" + mount + "&from=" + from
+
+	return &creq
+}
diff --git a/pkg/remotes/docker/discoverer.go b/pkg/remotes/docker/discoverer.go
new file mode 100644
index 0000000..c95ef73
--- /dev/null
+++ b/pkg/remotes/docker/discoverer.go
@@ -0,0 +1,375 @@
+/*
+   Copyright The containerd Authors.
+
+   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 docker
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"path"
+	"regexp"
+	"strings"
+
+	"github.com/containerd/containerd/log"
+	"github.com/containerd/containerd/reference"
+	"github.com/containerd/containerd/remotes"
+	"github.com/containerd/containerd/remotes/docker"
+	"github.com/docker/docker/errdefs"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/net/context/ctxhttp"
+)
+
+func WithDiscover(ref string, resolver remotes.Resolver, opts *docker.ResolverOptions) (remotes.Resolver, error) {
+	opts = NewOpts(opts)
+
+	r, err := reference.Parse(ref)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dockerDiscoverer{
+		header:     opts.Headers,
+		hosts:      opts.Hosts,
+		refspec:    r,
+		reference:  ref,
+		repository: strings.TrimPrefix(r.Locator, r.Hostname()+"/"),
+		tracker:    docker.NewInMemoryTracker(),
+		Resolver:   resolver}, nil
+}
+
+type dockerDiscoverer struct {
+	hosts      docker.RegistryHosts
+	header     http.Header
+	refspec    reference.Spec
+	reference  string
+	repository string
+	tracker    docker.StatusTracker
+	remotes.Resolver
+}
+
+var localhostRegex = regexp.MustCompile(`(?:^localhost$)|(?:^localhost:\\d{0,5}$)`)
+
+func (d *dockerDiscoverer) filterHosts(caps docker.HostCapabilities) (hosts []docker.RegistryHost, err error) {
+	h, err := d.hosts(d.refspec.Hostname())
+	if err != nil {
+		return nil, err
+	}
+
+	for _, host := range h {
+		if host.Capabilities.Has(caps) || localhostRegex.MatchString(host.Host) {
+			hosts = append(hosts, host)
+		}
+	}
+
+	return hosts, nil
+}
+
+func (d *dockerDiscoverer) Discover(ctx context.Context, desc ocispec.Descriptor, artifactType string) ([]artifactspec.Descriptor, error) {
+	ctx = log.WithLogger(ctx, log.G(ctx).WithField("digest", desc.Digest))
+
+	hosts, err := d.filterHosts(docker.HostCapabilityResolve)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(hosts) == 0 {
+		return nil, errdefs.NotFound(errors.New("no discover hosts"))
+	}
+
+	ctx, err = docker.ContextWithRepositoryScope(ctx, d.refspec, false)
+	if err != nil {
+		return nil, err
+	}
+
+	v := url.Values{}
+	v.Set("artifactType", artifactType)
+	query := "?" + v.Encode()
+
+	var firstErr error
+	for _, originalHost := range hosts {
+		host := originalHost
+		host.Path = strings.TrimSuffix(host.Path, "/v2") + "/oras/artifacts/v1"
+
+		req := d.request(host, http.MethodGet, "manifests", desc.Digest.String(), "referrers")
+		req.path += query
+		if err := req.addNamespace(d.refspec.Hostname()); err != nil {
+			return nil, err
+		}
+
+		refs, err := d.discover(ctx, req)
+		if err != nil {
+			// Store the error for referencing later
+			if firstErr == nil {
+				firstErr = err
+			}
+			continue // try another host
+		}
+
+		return refs, nil
+	}
+
+	return nil, firstErr
+}
+
+func (d *dockerDiscoverer) discover(ctx context.Context, req *request) ([]artifactspec.Descriptor, error) {
+	resp, err := req.doWithRetries(ctx, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		var registryErr docker.Errors
+		if err := json.NewDecoder(resp.Body).Decode(&registryErr); err != nil || registryErr.Len() < 1 {
+			return nil, errors.Errorf("unexpected status code %v: %v", req.String(), resp.Status)
+		}
+		return nil, errors.Errorf("unexpected status code %v: %s - Server message: %s", req.String(), resp.Status, registryErr.Error())
+	}
+
+	result := &struct {
+		References []artifactspec.Descriptor `json:"references"`
+	}{}
+	if err := json.NewDecoder(resp.Body).Decode(result); err != nil {
+		return nil, err
+	}
+
+	return result.References, nil
+}
+
+func isProxy(myhost, refhost string) bool {
+	if refhost != myhost {
+		if refhost != "docker.io" || myhost != "registry-1.docker.io" {
+			return true
+		}
+	}
+	return false
+}
+
+func (r *request) addNamespace(ns string) (err error) {
+	if !isProxy(r.host.Host, ns) {
+		return nil
+	}
+	var q url.Values
+	// Parse query
+	if i := strings.IndexByte(r.path, '?'); i > 0 {
+		r.path = r.path[:i+1]
+		q, err = url.ParseQuery(r.path[i+1:])
+		if err != nil {
+			return
+		}
+	} else {
+		r.path = r.path + "?"
+		q = url.Values{}
+	}
+	q.Add("ns", ns)
+
+	r.path = r.path + q.Encode()
+
+	return
+}
+
+func (d *dockerDiscoverer) request(host docker.RegistryHost, method string, ps ...string) *request {
+	header := d.header.Clone()
+	if header == nil {
+		header = http.Header{}
+	}
+
+	for key, value := range host.Header {
+		header[key] = append(header[key], value...)
+	}
+	parts := append([]string{"/", host.Path, d.repository}, ps...)
+	p := path.Join(parts...)
+	// Join strips trailing slash, re-add ending "/" if included
+	if len(parts) > 0 && strings.HasSuffix(parts[len(parts)-1], "/") {
+		p = p + "/"
+	}
+	return &request{
+		method: method,
+		path:   p,
+		header: header,
+		host:   host,
+	}
+}
+
+type request struct {
+	method string
+	path   string
+	header http.Header
+	host   docker.RegistryHost
+	body   func() (io.ReadCloser, error)
+	size   int64
+}
+
+func (r *request) authorize(ctx context.Context, req *http.Request) error {
+	// Check if has header for host
+	if r.host.Authorizer != nil {
+		if err := r.host.Authorizer.Authorize(ctx, req); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (r *request) do(ctx context.Context) (*http.Response, error) {
+	u := r.host.Scheme + "://" + r.host.Host + r.path
+	req, err := http.NewRequest(r.method, u, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header = http.Header{} // headers need to be copied to avoid concurrent map access
+	for k, v := range r.header {
+		req.Header[k] = v
+	}
+	if r.body != nil {
+		body, err := r.body()
+		if err != nil {
+			return nil, err
+		}
+		req.Body = body
+		req.GetBody = r.body
+		if r.size > 0 {
+			req.ContentLength = r.size
+		}
+	}
+
+	ctx = log.WithLogger(ctx, log.G(ctx).WithField("url", u))
+	log.G(ctx).WithFields(requestFields(req)).Debug("do request")
+	if err := r.authorize(ctx, req); err != nil {
+		return nil, errors.Wrap(err, "failed to authorize")
+	}
+
+	var client = &http.Client{}
+	if r.host.Client != nil {
+		*client = *r.host.Client
+	}
+	if client.CheckRedirect == nil {
+		client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
+			if len(via) >= 10 {
+				return errors.New("stopped after 10 redirects")
+			}
+			return errors.Wrap(r.authorize(ctx, req), "failed to authorize redirect")
+		}
+	}
+
+	resp, err := ctxhttp.Do(ctx, client, req)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to do request")
+	}
+	log.G(ctx).WithFields(responseFields(resp)).Debug("fetch response received")
+	return resp, nil
+}
+
+func (r *request) doWithRetries(ctx context.Context, responses []*http.Response) (*http.Response, error) {
+	resp, err := r.do(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	responses = append(responses, resp)
+	retry, err := r.retryRequest(ctx, responses)
+	if err != nil {
+		resp.Body.Close()
+		return nil, err
+	}
+	if retry {
+		resp.Body.Close()
+		return r.doWithRetries(ctx, responses)
+	}
+	return resp, err
+}
+
+func (r *request) retryRequest(ctx context.Context, responses []*http.Response) (bool, error) {
+	if len(responses) > 5 {
+		return false, nil
+	}
+	last := responses[len(responses)-1]
+	switch last.StatusCode {
+	case http.StatusUnauthorized:
+		log.G(ctx).WithField("header", last.Header.Get("WWW-Authenticate")).Debug("Unauthorized")
+		if r.host.Authorizer != nil {
+			if err := r.host.Authorizer.AddResponses(ctx, responses); err == nil {
+				return true, nil
+			} else if !errdefs.IsNotImplemented(err) {
+				return false, err
+			}
+		}
+
+		return false, nil
+	case http.StatusMethodNotAllowed:
+		// Support registries which have not properly implemented the HEAD method for
+		// manifests endpoint
+		if r.method == http.MethodHead && strings.Contains(r.path, "/manifests/") {
+			r.method = http.MethodGet
+			return true, nil
+		}
+	case http.StatusRequestTimeout, http.StatusTooManyRequests:
+		return true, nil
+	}
+
+	// TODO: Handle 50x errors accounting for attempt history
+	return false, nil
+}
+
+func (r *request) String() string {
+	return r.host.Scheme + "://" + r.host.Host + r.path
+}
+
+func requestFields(req *http.Request) logrus.Fields {
+	fields := map[string]interface{}{
+		"request.method": req.Method,
+	}
+	for k, vals := range req.Header {
+		k = strings.ToLower(k)
+		if k == "authorization" {
+			continue
+		}
+		for i, v := range vals {
+			field := "request.header." + k
+			if i > 0 {
+				field = fmt.Sprintf("%s.%d", field, i)
+			}
+			fields[field] = v
+		}
+	}
+
+	return logrus.Fields(fields)
+}
+
+func responseFields(resp *http.Response) logrus.Fields {
+	fields := map[string]interface{}{
+		"response.status": resp.Status,
+	}
+	for k, vals := range resp.Header {
+		k = strings.ToLower(k)
+		for i, v := range vals {
+			field := "response.header." + k
+			if i > 0 {
+				field = fmt.Sprintf("%s.%d", field, i)
+			}
+			fields[field] = v
+		}
+	}
+
+	return logrus.Fields(fields)
+}
diff --git a/pkg/remotes/docker/fetcher.go b/pkg/remotes/docker/fetcher.go
new file mode 100644
index 0000000..621a415
--- /dev/null
+++ b/pkg/remotes/docker/fetcher.go
@@ -0,0 +1,89 @@
+/*
+   Copyright The containerd Authors.
+
+   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 docker
+
+import (
+	"context"
+	"io"
+	"net/http"
+
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/log"
+	"github.com/containerd/containerd/remotes"
+	"github.com/containerd/containerd/remotes/docker"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+func (d *dockerDiscoverer) Fetcher(ctx context.Context, ref string) (remotes.Fetcher, error) {
+	d.reference = ref
+	return d, nil
+}
+
+func (d *dockerDiscoverer) Fetch(ctx context.Context, desc ocispec.Descriptor) (io.ReadCloser, error) {
+	hosts, err := d.filterHosts(docker.HostCapabilityPull)
+	if err != nil {
+		return nil, err
+	}
+	if len(hosts) == 0 {
+		return nil, errors.Wrap(errdefs.ErrNotFound, "no pull hosts")
+	}
+
+	switch desc.MediaType {
+	case artifactspec.MediaTypeArtifactManifest:
+		var errs []error
+		for _, host := range hosts {
+			req := d.request(host, http.MethodGet, "manifests", desc.Digest.String())
+			if err := req.addNamespace(d.refspec.Hostname()); err != nil {
+				errs = append(errs, err)
+				continue
+			}
+
+			resp, err := req.doWithRetries(ctx, nil)
+			if err != nil {
+				errs = append(errs, err)
+				continue
+			}
+
+			if resp.StatusCode > 299 {
+				resp.Body.Close()
+				continue
+			}
+
+			return resp.Body, nil
+		}
+
+		if len(errs) > 1 {
+			for _, e := range errs {
+				log.G(ctx).WithError(e).Errorf("error fetching artifact manifest")
+			}
+			return nil, errs[0]
+		}
+
+		log.G(ctx).WithField("media-type", desc.MediaType).WithField("digest", desc.Digest).Warnf("Could not fetch artifacts manifest")
+
+		// Since we couldn't get the manifest, fallback to the original resolver behavior to allow any error handling to happen
+	}
+
+	fetcher, err := d.Resolver.Fetcher(ctx, d.reference)
+	if err != nil {
+		return nil, err
+	}
+
+	return fetcher.Fetch(ctx, desc)
+}
diff --git a/pkg/remotes/docker/handler.go b/pkg/remotes/docker/handler.go
new file mode 100644
index 0000000..6233f42
--- /dev/null
+++ b/pkg/remotes/docker/handler.go
@@ -0,0 +1,122 @@
+package docker
+
+import (
+	"context"
+	"strings"
+	"sync"
+
+	"github.com/containerd/containerd/content"
+	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/platforms"
+	"github.com/containerd/containerd/remotes"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+	"github.com/pkg/errors"
+	"golang.org/x/sync/semaphore"
+)
+
+// PushContent pushes content specified by the descriptor from the provider.
+//
+// Base handlers can be provided which will be called before any push specific
+// handlers.
+func PushContent(ctx context.Context, pusher remotes.Pusher, desc ocispec.Descriptor, store content.Store, limiter *semaphore.Weighted, platform platforms.MatchComparer, wrapper func(h images.Handler) images.Handler) error {
+
+	var m sync.Mutex
+	manifestStack := []ocispec.Descriptor{}
+
+	filterHandler := images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
+		switch desc.MediaType {
+		case images.MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest,
+			images.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex,
+			artifactspec.MediaTypeArtifactManifest:
+			m.Lock()
+			manifestStack = append(manifestStack, desc)
+			m.Unlock()
+			return nil, images.ErrStopHandler
+		default:
+			return nil, nil
+		}
+	})
+
+	pushHandler := remotes.PushHandler(pusher, store)
+
+	platformFilterhandler := images.FilterPlatforms(images.ChildrenHandler(store), platform)
+
+	annotateHandler := annotateDistributionSourceHandler(platformFilterhandler, store)
+
+	var handler images.Handler = images.Handlers(
+		annotateHandler,
+		filterHandler,
+		pushHandler,
+	)
+	if wrapper != nil {
+		handler = wrapper(handler)
+	}
+
+	if err := images.Dispatch(ctx, handler, limiter, desc); err != nil {
+		return err
+	}
+
+	// Iterate in reverse order as seen, parent always uploaded after child
+	for i := len(manifestStack) - 1; i >= 0; i-- {
+		_, err := pushHandler(ctx, manifestStack[i])
+		if err != nil {
+			// TODO(estesp): until we have a more complete method for index push, we need to report
+			// missing dependencies in an index/manifest list by sensing the "400 Bad Request"
+			// as a marker for this problem
+			switch manifestStack[i].MediaType {
+			case ocispec.MediaTypeImageIndex, images.MediaTypeDockerSchema2ManifestList,
+				artifactspec.MediaTypeArtifactManifest:
+				if errors.Cause(err) != nil && strings.Contains(errors.Cause(err).Error(), "400 Bad Request") {
+					return errors.Wrap(err, "artifact or manifest list/index references to blobs and/or manifests are missing in your target registry")
+				}
+			}
+			return err
+		}
+	}
+
+	return nil
+}
+
+// annotateDistributionSourceHandler add distribution source label into
+// annotation of config or blob descriptor.
+func annotateDistributionSourceHandler(f images.HandlerFunc, manager content.Manager) images.HandlerFunc {
+	return func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
+		children, err := f(ctx, desc)
+		if err != nil {
+			return nil, err
+		}
+
+		// only add distribution source for the config or blob data descriptor
+		switch desc.MediaType {
+		case images.MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest,
+			images.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex,
+			artifactspec.MediaTypeArtifactManifest:
+		default:
+			return children, nil
+		}
+
+		for i := range children {
+			child := children[i]
+
+			info, err := manager.Info(ctx, child.Digest)
+			if err != nil {
+				return nil, err
+			}
+
+			for k, v := range info.Labels {
+				if !strings.HasPrefix(k, "containerd.io/distribution.source.") {
+					continue
+				}
+
+				if child.Annotations == nil {
+					child.Annotations = map[string]string{}
+				}
+				child.Annotations[k] = v
+			}
+
+			children[i] = child
+		}
+		return children, nil
+	}
+}
diff --git a/pkg/remotes/docker/opts.go b/pkg/remotes/docker/opts.go
new file mode 100644
index 0000000..f634902
--- /dev/null
+++ b/pkg/remotes/docker/opts.go
@@ -0,0 +1,65 @@
+package docker
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/remotes/docker"
+	"github.com/deislabs/oras/internal/version"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+// NewResolver returns a new resolver to a Docker registry
+func NewOpts(options *docker.ResolverOptions) *docker.ResolverOptions {
+	if options.Tracker == nil {
+		options.Tracker = docker.NewInMemoryTracker()
+	}
+
+	if options.Headers == nil {
+		options.Headers = make(http.Header)
+	}
+	if _, ok := options.Headers["User-Agent"]; !ok {
+		options.Headers.Set("User-Agent", "oras/"+version.Version)
+	}
+
+	resolveHeader := http.Header{}
+	if _, ok := options.Headers["Accept"]; !ok {
+		// set headers for all the types we support for resolution.
+		resolveHeader.Set("Accept", strings.Join([]string{
+			images.MediaTypeDockerSchema2Manifest,
+			images.MediaTypeDockerSchema2ManifestList,
+			ocispec.MediaTypeImageManifest,
+			ocispec.MediaTypeImageIndex, "*/*"}, ", "))
+	} else {
+		resolveHeader["Accept"] = options.Headers["Accept"]
+		delete(options.Headers, "Accept")
+	}
+
+	if options.Hosts == nil {
+		opts := []docker.RegistryOpt{}
+		if options.Host != nil {
+			opts = append(opts, docker.WithHostTranslator(options.Host))
+		}
+
+		if options.Authorizer == nil {
+			options.Authorizer = docker.NewDockerAuthorizer(
+				docker.WithAuthClient(options.Client),
+				docker.WithAuthHeader(options.Headers),
+				docker.WithAuthCreds(options.Credentials))
+		}
+		opts = append(opts, docker.WithAuthorizer(options.Authorizer))
+
+		if options.Client != nil {
+			opts = append(opts, docker.WithClient(options.Client))
+		}
+		if options.PlainHTTP {
+			opts = append(opts, docker.WithPlainHTTP(docker.MatchAllHosts))
+		} else {
+			opts = append(opts, docker.WithPlainHTTP(docker.MatchLocalhost))
+		}
+		options.Hosts = docker.ConfigureDefaultRegistries(opts...)
+	}
+
+	return options
+}
diff --git a/scripts/discover_demo.sh b/scripts/discover_demo.sh
new file mode 100755
index 0000000..c32441a
--- /dev/null
+++ b/scripts/discover_demo.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+if [ -z "$1" ]; then
+    echo 'Usage: ./discover_demo <repo>'
+    exit 1
+fi
+
+export PORT=5000
+export REGISTRY=localhost:${PORT}
+export REPO=$1
+export IMAGE=${REGISTRY}/${REPO}:v1
+
+
+echo '{"version": "0.0.0.0", "artifact": "'${IMAGE}'", "contents": "good"}' > sbom.json
+./oras push $REGISTRY/$REPO \
+    --artifact-type sbom/example \
+    --subject $IMAGE \
+    sbom.json:application/json
+
+echo '{"version": "0.0.0.0", "artifact": "'${IMAGE}'", "signature": "signed"}' > signature.json
+./oras push $REGISTRY/$REPO \
+    --artifact-type signature/example \
+    --subject $IMAGE \
+    signature.json:application/json
+
+./oras discover -o tree --artifact-type=sbom/example $IMAGE
+
+digest=$(./oras discover -o json --artifact-type sbom/example ${IMAGE} | jq -r '.references[0].digest')
+
+./oras pull -a "${REGISTRY}/${REPO}@${digest}"
+


Test patch:
diff --git a/pkg/images/handler_test.go b/pkg/images/handler_test.go
new file mode 100644
index 0000000..b37db0f
--- /dev/null
+++ b/pkg/images/handler_test.go
@@ -0,0 +1,89 @@
+package images
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	"github.com/containerd/containerd/content"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+)
+
+type (
+	testContentProvider struct {
+		content.Provider
+	}
+)
+
+func (testContentProvider) ReaderAt(ctx context.Context, desc ocispec.Descriptor) (content.ReaderAt, error) {
+	return &testContentProvider{}, nil
+}
+
+func (testContentProvider) ReadAt(p []byte, off int64) (n int, err error) {
+	manifest := testArtifactsManifest()
+
+	b, err := json.Marshal(manifest)
+	if err != nil {
+		return 0, err
+	}
+
+	return copy(p, b), nil
+}
+
+func (testContentProvider) Close() error {
+	return nil
+}
+
+func (testContentProvider) Size() int64 {
+	manifest := testArtifactsManifest()
+
+	b, err := json.Marshal(manifest)
+	if err != nil {
+		return -1
+	}
+
+	return int64(len(b))
+}
+
+func testArtifactsManifest() *artifactspec.Manifest {
+	return &artifactspec.Manifest{
+		Blobs: []artifactspec.Descriptor{
+			{
+				ArtifactType: "sbom/example",
+				MediaType:    "application/json",
+				Digest:       "test-sbom-example",
+			},
+			{
+				ArtifactType: "signature/example",
+				MediaType:    "application/json",
+				Digest:       "test-signature-example",
+			},
+		},
+	}
+}
+
+func TestAppendArtifactsHandler(t *testing.T) {
+	handler := AppendArtifactsHandler(&testContentProvider{})
+
+	subdescs, err := handler.Handle(context.Background(), ocispec.Descriptor{MediaType: artifactspec.MediaTypeArtifactManifest})
+	if err != nil {
+		t.Error(err)
+	}
+
+	if subdescs[0].MediaType != "application/json" {
+		t.FailNow()
+	}
+
+	if subdescs[0].Digest != "test-sbom-example" {
+		t.FailNow()
+	}
+
+	if subdescs[1].MediaType != "application/json" {
+		t.FailNow()
+	}
+
+	if subdescs[1].Digest != "test-signature-example" {
+		t.FailNow()
+	}
+}
diff --git a/pkg/oras/discover_test.go b/pkg/oras/discover_test.go
new file mode 100644
index 0000000..1553b2f
--- /dev/null
+++ b/pkg/oras/discover_test.go
@@ -0,0 +1,61 @@
+package oras
+
+import (
+	"context"
+	"testing"
+
+	"github.com/containerd/containerd/remotes"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
+)
+
+type (
+	testResolverWithDiscover struct {
+		remotes.Resolver
+	}
+	testResolverWithoutDiscover struct {
+		remotes.Resolver
+	}
+)
+
+func (testResolverWithDiscover) Resolve(ctx context.Context, ref string) (string, ocispec.Descriptor, error) {
+	return "", ocispec.Descriptor{MediaType: "test-media-type"}, nil
+}
+
+func (testResolverWithDiscover) Discover(ctx context.Context, desc ocispec.Descriptor, artifactType string) ([]artifactspec.Descriptor, error) {
+	return []artifactspec.Descriptor{
+		{
+			MediaType:    desc.MediaType,
+			ArtifactType: artifactType,
+		}}, nil
+}
+
+func TestDiscoverInterfaceOverride(t *testing.T) {
+	d, a, err := Discover(context.Background(), &testResolverWithDiscover{}, "testref", "testartifacttype")
+	if err != nil {
+		t.Error(err)
+	}
+
+	if d.MediaType != "test-media-type" {
+		t.FailNow()
+	}
+
+	if a[0].ArtifactType != "testartifacttype" {
+		t.FailNow()
+	}
+
+	if a[0].MediaType != "test-media-type" {
+		t.FailNow()
+	}
+}
+
+func TestDiscoverNotImplemented(t *testing.T) {
+	_, _, err := Discover(context.Background(), &testResolverWithoutDiscover{}, "testref", "testartifacttype")
+	if err == nil {
+		t.FailNow()
+	}
+
+	if err.Error() != "not implemented" {
+		t.FailNow()
+	}
+}