feat: Release Template

[mumoshu]

This feature is supposed to help advanced use-cases like Conventional Directory Structure explained in several issues like #428.

Newly added configuration keys templates, missingFileHandler, and the ability to defer executing template expressions in values, secrets, namespace, and chart of releases allows you to abstract away repetitions into a reusable template:

templates:
  default: &default
    missingFileHandler: Warn
    namespace: "{{`{{ .Release.Name }}`}}"
    chart: stable/{{`{{ .Release.Name }}`}}
    values:
    - config/{{`{{ .Release.Name }}`}}/values.yaml
    - config/{{`{{ .Release.Name }}`}}/{{`{{ .Environment.Name }}`}}.yaml
    secrets:
    - config/{{`{{ .Release.Name }}`}}/secrets.yaml
    - config/{{`{{ .Release.Name }}`}}/{{`{{ .Environment.Name }}`}}-secrets.yaml

releases:
- name: envoy
  <<: *default
- name: metricbeat
  <<: *default
# and so on..

See the updated documentation for more details.

Resolves #428

[goruha]

@mumoshu That's cool

[mumoshu]

Thanks! Let's see how this works in the wild.

[sstarcher]

Thanks, I'll check this out.

[sstarcher]

Just tested it out it's working great, but I do now get 50 messages of "skippping blah" per run.
One of my helmfile went from 175 lines to 125 lines. A pretty solid reduction. If we had first class support for the template instead of using the anchors it could reduce my file another 17 lines.

[sstarcher]

The repositories, templates, and environments block now takes about about 1/3rd of my file weighting in at 45 lines that is essentially duplicated between half a dozen helmfiles.

[mumoshu]

Glad it worked 👍

Regarding the "skipping blah" logs, perhaps you'd need a better log-level for it, something other than Warn or Error - Would it be Debug so that helmfile won't print it at the default log-level of Info?

[mumoshu]

The repositories, templates, and environments block now takes about about 1/3rd of my file weighting in at 45 lines that is essentially duplicated between half a dozen helmfiles.

Nice. Then we need "includes" for that, right? :) #380

[mumoshu]

And probably use a "global variable"(#398) across the helmfiles to locate the "library" helmfile that should be included to all of em.

[sstarcher]

@mumoshu ya, something like debug would work great is that already support? I glanced at the code and it was not immediately apparent.

[mumoshu]

It isn't supported yet, but should't be that hard to add. I'll do it later. In the meantime, more feedbacks/idea on how to shape global vars and includes or whatever works are appreciated. I'm eager to reduce your repetitions! 2019年1月22日(火) 3:08 Shane Starcher <notifications@github.com>:

…

@mumoshu <https://github.com/mumoshu> ya, something like debug would work great is that already support? I glanced at the code and it was not immediately apparent. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#439 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABV-anJBFqQMHFAV1S2Vp1nVu2WoXTnks5vFgIYgaJpZM4aKO6A> .

[sstarcher]

@mumoshu excellent thanks I'll think more about the globals.

[mumoshu]

#440 adds missingFileHandler: Debug

[georgevella]

Sorry to bring this PR back to life, but got a question about this feature. Any particular reason why the version field is not templated the same way as chart, namespace, etc. ?

[sstarcher]

several fields are not templated such as labels, but that feature could be added.

[mumoshu]

@georgevella Would you mind creating an issue to track that? Thanks!

[mumoshu]

Just for reference, templating for labels is tracked in #446