Support for library charts

[hairmare]

Is this a request for help?:

Probably

Is this a BUG REPORT or FEATURE REQUEST? (choose one):

This is a FEATURE REQUEST. I would like to be able to test library charts to
some degree using the chart-testing automation.

This will help with maintaining library charts since it could make it easier to change them if they are properly tested.

Version of Helm and Kubernetes:

"latest"

What happened:

I created a library chart on a repo with the chart-testing GitHub Action enabled.

What you expected to happen:

That chart-testing does some sort or more or less meaningful tests on my library chart.

How to reproduce it (as minimally and precisely as possible):

Run the install tests of chart-testing against a charts/ folder containing a library chart.

Anything else we need to know:

I think there are a few reasonable ideas on how to tackle this but wanted to get some input:

• this could be out of scope for chart-testing and I should ignore my library. If this is the way to go I should try to always combine any changes to the library chart with changes to an example chart that uses the library (this might result in some sorts of dependency-hell when it comes to managing Chart.lock files in PRs)
• chart-testing could support a concrete example of the library in the ci/ folder and use that for testing
• chart-testing could only support linting library charts and not exit with and simply not attempt to install a library chart (i can already do this by ignoring my library chart)

[lukasz-mitka]

I would go with not event trying to install library charts. Since it's not possible just skip them.

For anyone looking for a workaround: Create separate config file for install only which excludes library charts.

[gionn]

We have a library chart among other charts, it's quite surprising to see that libraries chart are not supported.

Before discovering this issue, I had also to create an empty values.yaml otherwise was even failing earlier.

Will try to use a separated config for ct install but looks really clunky.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[lukasz-mitka]

bad bot.
Still needed.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[hairmare]

most likely ct should just skip library charts during ct install, but it should lint them during ct lint. I can do this now using two different configs, but keeping those up to date feels error prone and a lot of manual work.

would a change that just makes ct install skip library charts be a welcome change?

[davidkarlsen]

@hairmare I'd say that makes sense. Just skip them and print a warning.