Reconcile component database from blob store task does not restore docker assets which name starts with "/"

SYMPTOM:

After rolling back from the NewDB (PostgreSQL) to OrientDB, run the Reconcile component database from blob store task and it reported ERRORs for Docker assets:

2021-11-26 17:01:33,434+1000 ERROR [quartz-10-thread-3] *SYSTEM com.sonatype.nexus.blobstore.restore.internal.orient.OrientDockerRestoreBlobStrategy - Unable to restore Docker version /v, blob name /v2/sonatype/nexus3/manifests/3.35.0
2021-11-26 17:01:33,434+1000 INFO  [quartz-10-thread-3] *SYSTEM com.sonatype.nexus.blobstore.restore.internal.orient.OrientDockerRestoreBlobStrategy - Restored asset, blob store: default, repository: docker-proxy, path: /v2/sonatype/nexus3/manifests/3.35.0, blob name: /v2/sonatype/nexus3/manifests/3.35.0, blob id: def932ad-71e1-4311-a1ee-1000313d0463

REPRODUCE STEPS:

1. Install new NXRM 3.36 and start (so that "default" blob store is empty)
2. Copy the attached 5fe943f8-032d-4334-a3f2-58889d94ce7b.* to default/contents/vol-33/chap-21/, for example:

   mkdir -p sonatype-work/nexus3/blobs/default/content/vol-01/chap-24
   cp ./def932ad-71e1-4311-a1ee-1000313d0463.* sonatype-work/nexus3/blobs/default/content/vol-01/chap-24
   

3. Create "docker-proxy" repo with the remote URL https://registry-1.docker.io/ and with the "default" blob store
4. Create "Reconcile component database from blob store" task and run against "default" blob store

EXPECTED BEHAVIOUR:

As NXRM3 should provide the way to rollback, this should restore the files.

ACTUAL BEHAVIOUR:

Got "Unable to restore Docker version /v" and also "estored asset, blob store: default, repository: docker-proxy, path: ...", but the component DB's "component" and "asset" both are empty, and Browse page is empty.

POTENTIAL CAUSE:

com.sonatype.nexus.blobstore.restore.internal.orient.OrientDockerRestoreBlobStrategy#createAssetFromBlob has the following line which checks the first two characters to find the version:

    String version = data.getBlobData().getBlobName().substring(0, 2);

NOTE:

Also, reconciling docker assets created by OrientDB may not work with Nexus + NewDB because com.sonatype.nexus.blobstore.restore.internal.datastore.DockerRestoreBlobStrategy#createAssetFromBlob has below:

    String version = data.getBlobName().substring(1, 3);

POTENTIAL WORKAROUND:

Remove the "/" from the blob-name:

sed -i.bak 's/@BlobStore.blob-name=\/v([12])\//@BlobStore.blob-name=v\1\//' def932ad-71e1-4311-a1ee-1000313d0463.properties

NOTE: this will create def932ad-71e1-4311-a1ee-1000313d0463.properties.bak

ANOTHER CONCERN:

Also, if OrientDB has the asset and blob store has the .properties file with "BlobStore.blob-name=/v2/...", the Reconcile task with Integrity check may remove the asset (soft-delete).

$ cp def932ad-71e1-4311-a1ee-1000313d0463.properties.bak def932ad-71e1-4311-a1ee-1000313d0463.properties

Then running same task again generates below log:

2021-11-26 17:19:34,373+1000 ERROR [quartz-10-thread-6] *SYSTEM org.sonatype.nexus.blobstore.restore.orient.DefaultOrientIntegrityCheckStrategy - Name does not match on asset! Metadata name: '/v2/sonatype/nexus3/manifests/3.35.0', Blob name: 'v2/sonatype/nexus3/manifests/3.35.0'
2021-11-26 17:19:34,375+1000 INFO  [quartz-10-thread-6] *SYSTEM org.sonatype.nexus.blobstore.restore.orient.OrientRestoreMetadataTask - Removing asset v2/sonatype/nexus3/manifests/3.35.0 from repository docker-proxy, blob integrity check failed

Now the Browse page no longer shows NXRM 3.35 tag.