MediaTypeArtifactManifest not found in v2

[yuseferi]

Hi there,
After updating to V2, linter failed with

    golangci-lint run ./...        

WARN [runner] Can't run linter goanalysis_metalinter: buildir: failed to load package descriptor: could not load export data: no export data for "oras.land/oras-go/v2/internal/descriptor" 
ERRO Running error: 1 error occurred:
        * can't run linter goanalysis_metalinter: buildir: failed to load package descriptor: could not load export data: no export data for "oras.land/oras-go/v2/internal/descriptor"

after dig into the code, I noticed this const ( MediaTypeArtifactManifest) has not been set in the code.

[ARolek]

We're also running into this via Open Policy Agent. Looks like that's your problem as well @yuseferi. open-policy-agent/opa#5769 (comment)

[Wwwsylvia]

Do you mean application/vnd.oci.artifact.manifest.v1+json or application/vnd.cncf.oras.artifact.manifest.v1+json?

• The media type application/vnd.oci.artifact.manifest.v1+json is defined in the OCI image-spec since v1.1.0-rc1 , but it just got deprecated in v1.1.0-rc.3 by the PR Remove artifact manifest opencontainers/image-spec#999 . We have issue Upgrading to new OCI 1.1 spec #494 to track the changes in oras-go.

• The support for media type application/vnd.cncf.oras.artifact.manifest.v1+json has been removed from oras-go since v2.0.0-rc.4.

[yuseferi]

Hey @Wwwsylvia ,
if it's depreciated so the usage of the cost should be removed too. there are lots of them, please search for it in your the codebase.

Best

[shizhMSFT]

@yuseferi As mentioned by @Wwwsylvia ans as stated on #494, there is a breaking change in the latest image-spec v1.1.0-rc.3 that the symbol MediaTypeArtifactManifest has been removed. We are discussing how to resolve that accordingly.

[yuseferi]

Thank you @shizhMSFT , this issue is breaking lots of projects that are using this package indirectly. mostly https://github.com/open-policy-agent/opa project. that would be nice to decide about it a bit faster or revert the changes.
Best.

[shizhMSFT]

The changes are in the OCI image-spec repository and thus the ORAS community are not able to revert the changes.

As a solution, I've sent a PR #496 to resolve the compiling error due the missing symbol MediaTypeArtifactManifest.