fix e2e

Signed-off-by: Billy Zha <jinzha1@microsoft.com>

cmd/oras/internal/option/referrers.go

@@ -34,10 +34,10 @@ func (opts *Referrers) ApplyFlags(fs *pflag.FlagSet) {
 
 // SetReferrersGC sets the referrers GC option for the passed-in target.
 func (opts *Referrers) SetReferrersGC(target any) error {
-	repo, ok := target.(*remote.Repository)
-	if !ok {
+	if repo, ok := target.(*remote.Repository); ok {
+		repo.ReferrersGC = opts.GC
+	} else if opts.GC {
 		return errors.New("referrers GC can only be enforced to registry targets")
 	}
-	repo.ReferrersGC = opts.GC
 	return nil
 }

test/e2e/go.mod

@@ -2,6 +2,8 @@ module oras.land/oras/test/e2e
 
 go 1.20
 
+replace oras.land/oras-go/v2 => github.com/qweeah/oras-go/v2 v2.0.0-20230526033205-9b4915420e0b
+
 require (
 	github.com/onsi/ginkgo/v2 v2.9.7
 	github.com/onsi/gomega v1.27.7

test/e2e/go.sum

@@ -24,6 +24,8 @@ github.com/opencontainers/image-spec v1.1.0-rc.3 h1:GT9Xon8YrLxz6N7sErbN81V8J4lO
 github.com/opencontainers/image-spec v1.1.0-rc.3/go.mod h1:X4pATf0uXsnn3g5aiGIsVnJBR4mxhKzfwmvK/B2NTm8=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/qweeah/oras-go/v2 v2.0.0-20230526033205-9b4915420e0b h1:MoOGc1X5qRL+n4AtzaI9TgzLcsDbWSgU34/gVB1shQs=
+github.com/qweeah/oras-go/v2 v2.0.0-20230526033205-9b4915420e0b/go.mod h1:pXjn0+KfarspMHHNR3A56j3tgvr+mxArHuI8qVn59v8=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
@@ -47,5 +49,3 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-oras.land/oras-go/v2 v2.2.0 h1:E1fqITD56Eg5neZbxBtAdZVgDHD6wBabJo6xESTcQyo=
-oras.land/oras-go/v2 v2.2.0/go.mod h1:pXjn0+KfarspMHHNR3A56j3tgvr+mxArHuI8qVn59v8=