Skaffold needs to support arbitrary mutations to manifests

[hach-que]

Skaffold's file sync only seems to work with pods, which isn't very useful since I'd assume most folks use deployments in production (and we want to keep the environment as close as possible between our local development and production clusters).

I've also tried using hostPath mounts, but neither Skaffold's kubectl nor kustomize support allow interpolating environment variables into that Kubernetes field. Outside using Helm (which is extreme overkill for what a simple sed command can achieve), there doesn't appear to be anyway to properly mount host paths into a container.

Skaffold really needs to support a configuration option for these use-cases something like this:

apiVersion: skaffold/v1beta2
kind: Config
build:
  # ...
deploy:
  kustomize:
    path: services/kubernetes/dev
    interpolateWith:
      - "sed ...." # some executable command that accepts the manifest files on stdin, and outputs the modified manifest files to stdout
  # or
  kubectl:
    manifests:
      - "..."
    interpolateWith:
      - "sed ...." # some executable command that accepts the manifest files on stdin, and outputs the modified manifest files to stdout

Something general like this would enable developers to cover off pretty much any additional customisation they need to do.

[balopat]

Hi @hach-que, thanks for opening this issue!

1. Filesync does work with Deployments, Skaffold syncs to the first pod of a deployment
2. Kustomize / kubectl & hostPath: can you explain your use case? Does the hostPath change per environment?

I don't think full manifest interpolation is something we would like to support.

[tstromberg]

Thank you for the idea! I'm closing this issue as it's been open a while, and no progress seems to be being made on it. If you feels strongly about this issue, feel free to comment here or re-raise an issue referencing this one.