how to dynamically generate values? | advanced exec usage

[jurgenweber]

Can a hook return something that can then be used in .Values?

so hook executes:

git ls-remote git@bitbucket.org:asdf/mysuperfunhappytimeapp.git | master | awk '{ print $1}' | head -c 8

.Values.hookname.return

the other way is a bash wrapperI suppose.

or execute bash inside the template...

[mumoshu]

@jurgenweber Hey!

Just curious do you have a specific reason you want it to be in hooks?

If not, you can try this to dynamically generate values:

somekey: {{ exec "sh" (list "-c" "git ls-remote .... | grep maser | awk ...." )) }}

[jurgenweber]

OMG that is amazing. Should add it to the tips and tricks thread. :)

[jurgenweber]

using this; https://github.com/roboll/helmfile#importing-values-from-any-source

{{- $git_branch := env "GIT_BRANCH" | default "master" }}
 {{- $git_hash := exec "sh" (list "-c" "git ls-remote git@bitbucket.org:myrepo/myrepo.git `{{ $git_branch }}` | awk '{ print $1}' | head -c 8") }}

what env is in that exec?

that git_branch is ""

[jurgenweber]

@mumoshu can you expand more on the pipeline example, please?

Or even with a pipeline:

mysetting: |
{{ yourinput | exec "./mycmd-consume-stdin" (list "arg1" "arg2") | indent 2 }}

does yourinput become an arg to the command? Can you make it an env var? Basically, what can you do with 'yourinput'?

I am trying to substitute a variable without success:

 {{- $exec_list = (list "-c" "git ls-remote git@bitbucket.org:asdf/asdf-api.git ${BRANCH} | awk '{print $1}' | head -c 8") }}
 {{- $git_hash := "export BRANCH=release" | exec "bash" $exec_list }}

• edit; fix typos, add substitution issue.

[mumoshu]

yourinput becomes the last argument to the template function after |. That's how go text/template works so everything explained in https://golang.org/pkg/text/template/ would help you find more advanced usages.

[jurgenweber]

yeah, ok. I decided to just make a bash script in the end but ok, wondered if it was using golang exec.