What

Allows you to change and populate Helm Values file (or any yaml file for that matter), using env variables. The ironhalik/env2helm docker image comes with latest-ish Helm and kubectl for your convenience.

How

Example values.yaml:

image:  
  repository: alpine  
  tag: 3.9

$ export ENV2HELM_IMAGE_REPOSITORY=ubuntu
$ export ENV2HELM_IMAGE_TAG=bionic
$ env2helm -f values.yaml

will output:

image:
  repository: ubuntu
  tag: bionic

If you're using it in a CI environment, you can use -i or --in-place flag to overwrite the input files with any changes. Alternatively, depending on your shell, you can do something along the lines of helm install -f <(env2helm -f some-values-file.yaml)

Usage

usage: env2helm [-h] -f FILES [-p PREFIX] [-i] [-s] [-t]

Map ENV vars to yaml

optional arguments:
  -h, --help            show this help message and exit

required arguments:
  -f FILES, --file FILES
                        Files to process. Can be supplied multiple times.

optional arguments:
  -p PREFIX, --prefix PREFIX
                        Prefix to look for in env variables. Defaults to
                        ENV2HELM_
  -i, --in-place        Overwrite files instead of printing to stdout. Think
                        sed -i
  -s, --strict          Exit with status code 2 if a prefixed env var did not
                        match any yaml key
  -t, --to-string       Insert values as strings, surrounded by quotation
                        marks