Image registry proxy/pull through cache strip additional prefix(es)

[sjoukedv]

Tell us more.

Split from #18112 (comment)

For example, ECR has the concept of pull through rules (Sync an upstream registry with an Amazon ECR private registry) similar to Harbor's proxy cache. The path has a prefix that indicates which remote to retrieve the image from so:

aws_account_id.dkr.ecr.region.amazonaws.com/ghcr/renovatebot/renovate

is retrieved from

ghcr.io/renovatebot/renovate

This has many advantages like avoiding ratelimits. When running Renovate on these repositories the Dockerfile manager looks for new versions in aws_account_id.dkr.ecr.region.amazonaws.com/ghcr/renovatebot/renovate and not in the remote that it is set up to mirror leading to new versions not being detected properly.

Suggested solution: there is already a list of hardcoded prefixes it would be great if we can configure this dynamically, so that renovate strips the prefix when looking for version on the remote.

[rarkins]

Have you tried registryAliases? It sounds like you could alias aws_account_id.dkr.ecr.region.amazonaws.com/ghcr/ to ghcr.io/

[sjoukedv]

Yes, also tried that but lookupName still contains the prefix:

{
         "dockerfile": [
           {
             "deps": [
               {
                 "autoReplaceStringTemplate": "{{depName}}{{#if newValue}}:{{newValue}}{{/if}}{{#if newDigest}}@{{newDigest}}{{/if}}",
                 "currentValue": "2023",
                 "currentVersion": "2023",
                 "datasource": "docker",
                 "depName": "my-account-id.dkr.ecr.eu-west-1.amazonaws.com/ecr/amazonlinux/amazonlinux",
                 "depType": "stage",
                 "fixedVersion": "2023",
                 "lookupName": "ecr/amazonlinux/amazonlinux",
                 "packageName": "my-account-id.dkr.ecr.eu-west-1.amazonaws.com/ecr/amazonlinux/amazonlinux",
                 "registryUrl": "https://my-account-id.dkr.ecr.eu-west-1.amazonaws.com",
                 "replaceString": "my-account-id.dkr.ecr.eu-west-1.amazonaws.com/ecr/amazonlinux/amazonlinux:2023",
                 "versioning": "docker",
                 "warnings": [],
                 "updates": []
               },
              ]
            }
          ]
}

[viceice]

remove trailing slash from alias and value

[github-actions[bot]]

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