Get exact chart version from helm_template

[mxk]

Description

It is sometimes desirable to convert a Helm chart version specification, such as ^1.0.0 to an exact version. Currently helm_template just returns the original version value. My exact use case is installing cert-manager and needing to get the corresponding version for the CRDs URL. Alternatively, it would be nice to have a separate data resource for this that didn't have the overhead of rendering all the templates.

Potential Terraform Configuration

data "helm_template" "main" {
  name       = "cert-manager"
  repository = "https://charts.jetstack.io"
  chart      = "cert-manager"
  version    = "^1.0.0"
}

output "version" {
  version = data.helm_template.main.version # Want "1.15.1"
}

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[jrhouston]

Thanks for opening an issue @mxk.

Alternatively, it would be nice to have a separate data resource for this that didn't have the overhead of rendering all the templates.

This is something that has come up before, where we could add a helm_release_metadata data source that would be equivalent to the helm get metadata command which returns the chart, version, appVersion, etc. I think this might be preferable to adding some kind of separate computed_version field for this use case.

[mxk]

I agree. The other downside of helm_template is that it stores the rendered templates in the state, which can be a lot of data. You can limit that with show_only, but it's kind of a hack.