yq - issue adding yaml into yaml-CodePudding

Hi I would like to update a yaml like string into a yaml

i do have the following yaml file argocd.yaml

---
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  namespace: mynamespace
  name:my-app
spec:
  project: xxx
  destination:
    server: xxx
    namespace: xxx
  source:
    repoURL: xxx
    targetRevision: dev
    path: yyy
    helm:
      values: |-
        image:
          tag: "mytag"
          repository: "myrepo-image"
          registry: "myregistry"

and ultimatively I want to replace the value of tag. Unfortunately this is a yaml in a yaml configuration.

My Idea so far was:

extract value into another values.yaml
Update the tag
evaluate the values in the argocd.yaml with the values.yaml So what worked is:

# get the yaml in the yaml and save as yaml
yq e .spec.source.helm.values argocd.yaml > helm_values.yaml
# replace the tag value
yq e '.image.tag=newtag' helm_values.yaml

and then I want to add the content of the helm_values.yaml file as string into the argocd.yaml I tried it the following but I can't get it work

# idea 1
###################
yq eval 'select(fileIndex==0).spec.source.helm.values =  select(fileIndex==1) | select(fileIndex==0)' argocd.yaml values.yaml

# this does not update the values but add back slashes 

values: "\nimage:\n  tag: \"mytag\"\n  repository: \"myrepo-image\"\n  registry: \"myregistry\""

# idea 2
##################
yq eval '.spec.source.helm.values = "'"$(< values.yaml)"'"' argocd.yam

here i am not getting the quite escape correctly and it fails with

Error: Parsing expression: Lexer error: could not match text starting at 2:9 failing at 2:12.
        unmatched text: "newtag"

Any Idea how to solve this or is there a better way to replace a value in such a file? I am using yq from https://mikefarah.gitbook.io/yq

CodePudding user response：

Your second approach can work, but in a roundabout way, as mikefarah/yq does not support updating multi-line block literals yet

One way to solve this, with the existing constructs would be to do below, without having to create a temporary YAML file

o="$(yq e '.spec.source.helm.values' yaml | yq e '.image.tag="footag"' -)" yq e '.spec.source.helm.values = strenv(o)' yaml

I have raised a feature request in the author's repo to provide a simpler way to do this Support for updating YAML multi-line strings #974