How to replace image with build results in CRD resource (not deployment but similar)

[Ke Zhu]

I’m using skaffold v1.27.0 with kustomize 4.2.0

Background: The platform I use provides a CRD to manage deployment instead of the k8s deployment itself, more like:

apiVersion: example.com/v1alpha1

Kind: Application

spec:

   image: xxx

This is the command I used: skaffold build --dry-run -q | skaffold render --digest-source='tag' --build-artifacts - --offline=true -p noprod | kpt cfg grep “kind=Application"

The expectation would be:

apiVersion: example.com/v1alpha1

Kind: Application

spec:

   Image: my-awesome-repo/xxx:tag

But the actual result is:

apiVersion: example.com/v1alpha1

Kind: Application

spec:

   image: xxx

Notice: skaffold build --dry-run -q  works as expected with env variable SKAFFOLD_DEFAULT_REPO=my-awesome-repo where it renders the build artifacts as expected:

{"builds":[{"imageName”:"xxx","tag”:”my-awesome-repo/xxx:7f3eef8"}]}

I thought this could be a kustomize problem where the `newImage` and `newTag` doesn’t work with the above CRD, but I wonder if skaffold community could help 

[Ke Z]

I pasted this answer in stackflow by using the ImageTagTransformer https://stackoverflow.com/a/68292689/914967

However, still need help on how to get it to work with skaffold workflow

[Brian de Alwis]

Sorry for this late reply.  Skaffold disabled image rewriting for all manifests except for those in an allowlist a while ago as it was causing some issues with CRDs and CRs that weren't expecting some of the changes.  We have an open issue to improve this (#4081).

In the meantime, you can hack the Skaffold source to add your custom resource to the allowlist:

https://github.com/GoogleContainerTools/skaffold/blob/f280aa8325283a0f080989acef120c5597ebc4b7/pkg/skaffold/kubernetes/manifest/visitor.go#L28

If it's a public custom resource, please submit a PR and we can incorporate the change.

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[Ke Z]

Brian,

Thanks for the reply and pointer of the allowlist! I've included this into my answer.