feat: GA of Kustomize and K8s manifests support

[mumoshu]

This is the GA version of the helm-x integration #673 developed last year.

Benefits? You get all the followings without an extra helm plugin:

• Ability to add ad-hoc chart dependencies/aliases, without forking the chart (Fixes Support for multiple charts in single release (similar to alias in helm) #876 )
• Ability to patch resulting K8s resources before installing the helm chart
• Ability to install a kustomization as a chart (Requires kustomize binary to be available in $PATH
• Ability to install a directory of K8s manifests as a chart
• etc.

[lukasmrtvy]

any progress ?

[dudicoco]

@mumoshu I can not get this feature to work.

helm version version.BuildInfo{Version:"v3.2.1", GitCommit:"fe51cd1e31e6a202cba7dead9552a6d418ded79a", GitTreeState:"clean", GoVersion:"go1.13.10"}

First attempt:

releases:
- chart: my-repo/amazing-app
  version: 1.0.4
  installed: true
  name: amazing-app
  namespace: devops
  labels:
    chart: amazing-app
    name: amazing-app
    namespace: devops
  jsonPatches:
  - target:
      version: v1
      kind: Pod
      name: static-web
    patch:
    - op: replace
      path: /spec/containers/0/command
      value:
      - sleep
      - "123"

output:

$ helmfile diff
I0527 15:36:00.959212   23656 chartify.go:236] using requirements.yaml:
dependencies:
  - name: base
    version: "^1.0.0"
    repository: "@my-repo"
    alias: amazing-app
in ./helmfile.yaml: [exit status 1

COMMAND:
  helm dependency build /var/folders/fj/scl5dj6d13b7mb34kxzwwfp80000gn/T/4001514311826455215/amazing-app

OUTPUT:
  manager.go:107: warning: a valid Helm v3 hash was not found. Checking against Helm v2 hash...
  Error: the lock file (requirements.lock) is out of sync with the dependencies file (requirements.yaml). Please update the dependencies]

Removing the jsonPatches block solves this issue.

Second attempt:

releases:
- name: foo
  chart: incubator/raw
  dependencies:
  - alias: bar
    chart: incubator/raw
  values:
  - bar:
      enabled: true
      resources:
      - apiVersion: v1
        kind: Pod
        metadata:
          name: bar
        spec:
          containers:
          - command:
            - sleep
            - 1000
            image: alpine:3.9.4
            imagePullPolicy: IfNotPresent
            name: bar
  jsonPatches:
  - target:
      version: v1
      kind: Pod
      name: static-web
    patch:
    - op: replace
      path: /spec/containers/0/command
      value:
      - sleep
      - "123"

Output:

$ helmfile diff
I0527 15:39:03.873601   23756 chartify.go:236] using requirements.yaml:
dependencies:
- name: raw
  repository: https://kubernetes-charts-incubator.storage.googleapis.com/
  condition: bar.enabled
  alias: bar
  version: "*"
I0527 15:39:13.813020   23756 replace.go:45] options: {false [] []  }
in ./helmfile.yaml: [invalid state: no files rendered]

Removing the jsonPatches and 'dependencies' blocks solves this issue.