Failed to look up go package on self-hosted BUF Schema Registry

[anthr76]

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I'm trying to run renovate with a self-hosted BUF Schema Registry I have configured a username/password hostRule and have successfully stopped seeing 401s. Although renovate doesn't seem to understand how to parse versions of a package.

Logs are below. Details will be omitted. Due to sensitive nature creating a repro repo will be difficult at this time but I'm happy to share as much details as I can!

Logs (if relevant)

Logs

               {
                 "datasource": "go",
                 "depType": "require",
                 "depName": "bsr.corp.domain.com/gen/go/corp/gopackage/protocolbuffers/go",
                 "currentValue": "v1.34.2-20250122185525-b8a63e36f9b7.1",
                 "currentDigest": "b8a63e36f9b7",
                 "digestOneAndOnly": true,
                 "versioning": "loose",
                 "managerData": {"multiLine": true, "lineNumber": 6},
                 "updates": [],
                 "packageName": "bsr.corp.domain.com/gen/go/corp/gopackage/protocolbuffers/go",
                 "warnings": [
                   {
                     "topic": "bsr.corp.domain.com/gen/go/corp/gopackage/protocolbuffers/go",
                     "message": "Failed to look up go package bsr.corp.domain.com/gen/go/corp/gopackage/protocolbuffers/go"
                   }
                 ]
               },
 INFO: Unsupported go host - cannot look up versions (repository=corp/repo)
       "packageName": "bsr.corp.domain.com/gen/go/corp/gopackage/protocolbuffers/go"
       DEBUG: Failed to look up go package bsr.corp.domain.com/gen/go/corp/goapp/grpc/go (repository=corp/app, packageFile=hack/reservation/go.mod, dependency=bsr.corp.domain.com/gen/go/corp/goapp/grpc/go)
       DEBUG: Failed to look up go package bsr.corp.domain.com/gen/go/corp/goapp/grpc/go (repository=corp/app, packageFile=go.mod, dependency=bsr.corp.domain.com/gen/go/corp/goapp/grpc/go)
       DEBUG: Failed to look up go package bsr.corp.domain.com/gen/go/corp/goapp/protocolbuffers/go (repository=corp/app, packageFile=hack/reservation/go.mod, dependency=bsr.corp.domain.com/gen/go/corp/goapp/protocolbuffers/go)
       DEBUG: Failed to look up go package bsr.corp.domain.com/gen/go/corp/goapp/protocolbuffers/go (repository=corp/app, packageFile=go.mod, dependency=bsr.corp.domain.com/gen/go/corp/goapp/protocolbuffers/go)

I do seem there's some logic for buf.build

renovate/lib/modules/datasource/go/base.spec.ts

Lines 476 to 503 in 0b6fd93

	it('returns null for mod imports', async () => {
	const meta =
	'<meta name="go-import" content="buf.build/gen/go/gogo/protobuf/protocolbuffers/go mod https://buf.build/gen/go">';
	httpMock
	.scope('https://buf.build')
	.get('/gen/go/gogo/protobuf/protocolbuffers/go?go-get=1')
	.reply(200, meta);
	const res = await BaseGoDatasource.getDatasource(
	'buf.build/gen/go/gogo/protobuf/protocolbuffers/go',
	);
	expect(res).toBeNull();
	});
	it('returns null for invalid import URL', async () => {
	const meta =
	'<meta name="go-import" content="buf.build/gen/go/gogo/protobuf/protocolbuffers/go git foobar">';
	httpMock
	.scope('https://buf.build')
	.get('/gen/go/gogo/protobuf/protocolbuffers/go?go-get=1')
	.reply(200, meta);
	const res = await BaseGoDatasource.getDatasource(
	'buf.build/gen/go/gogo/protobuf/protocolbuffers/go',
	);
	expect(res).toBeNull();