This is an experimental repo that attempts to convert a KOTS application to a Helm chart.
Given a directory of Kubernetes and KOTS manifests, this project will parse this and create a working Helm chart.
Helm charts require a values.yaml file. KOTS applications used a config.yaml syntax. This utility will convert a KOTS config to a helm values.yaml, keeping the KOTS heriarchy and defaults.
KOTS application use {{repl }} template functions. This utility will convert (some of) these to Helm templates.
The following list contains the tested template functions and how they are converted:
| KOTS Template | Supported | Notes |
|---|---|---|
| ConfigOption | Yes | |
| ConfigOptionEquals | Yes | |
| IsKurl | Yes | Always will evaluate to false, this will write a value to values.yaml isKurl = false and replace the template function {{ IsKurl }} with {{ .Values.isKurl }} |
| Namespace | Yes | Uses the {{ .Release.Namespace }} function |
KOTS supports kots.io/when and kots.io/exclude annotations. These will be converted to {{ if }}... {{ end if}} around the entire manifest.
In addition to the template functions, this will config conditional logic (if, else, end) from {{repl if}} to helm's {{if }} syntax.
- Support for multi doc yaml?
- LicenseFieldValue?
Ok, so here's an example:
% git clone https://github.com/replicatedhq/kots-sentry
Cloning into 'kots-sentry'...
remote: Enumerating objects: 567, done.
remote: Counting objects: 100% (225/225), done.
remote: Compressing objects: 100% (152/152), done.
remote: Total 567 (delta 117), reused 126 (delta 56), pack-reused 342
Receiving objects: 100% (567/567), 199.03 KiB | 2.52 MiB/s, done.
Resolving deltas: 100% (342/342), done.
% .kots2helm ../kots-sentry/manifests --name sentry --version 0.0.1
Helm chart created at sentry-0.0.1.tgz