ArgoCD dislikes a broken template patch

[ckav370]

Checklist:

• [x] I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• [x] I've included steps to reproduce the bug.
• [x] I've pasted the output of argocd version.

Describe the bug

ArgoCD is managing itself.

Using a template patch to set sync policy in an applicationset and make it configurable across different apps. It seems there was an issue with the templatePatch which has caused ArgoCD to throw an error and the UI to no longer be available

TypeError: Cannot read properties of undefined (reading 'chart')
    at https://argocd/main.4176eed80be48b27f252.js:2:1930731
    at Array.map (<anonymous>)
    at Object.children (https://argocd/main.4176eed80be48b27f252.js:2:1929919)
    at Yr.render (https://argocd/main.4176eed80be48b27f252.js:2:1478481)
    at zi (https://argocd/main.4176eed80be48b27f252.js:2:771988)
    at Hi (https://argocd/main.4176eed80be48b27f252.js:2:771783)
    at Es (https://argocd/main.4176eed80be48b27f252.js:2:807407)
    at Sl (https://argocd/main.4176eed80be48b27f252.js:2:798866)
    at xl (https://argocd/main.4176eed80be48b27f252.js:2:798791)
    at hl (https://argocd/main.4176eed80be48b27f252.js:2:795814)

Example template Patch (using helm, not kustomize hence the escape characters)

      syncPolicy:
        syncOptions:
          - CreateNamespace=true
  templatePatch: |-
    spec:
    {{`{{ if .autoSync }}
      syncPolicy:
        syncOptions:
          - CreateNamespace=true
        automated:
          prune: true
          selfHeal: true
    {{ end }}`}}

To Reproduce

Adding an invalid template patch like above which has a patch for an existing sync policy, sync and watch the UI become unavailable

Expected behavior

Template patch is anything invalid which I would expect the applicationset controller to report and degraded or out of sync, not throwing an error which renders the UI inaccessible

The fix was to define the templatePatch properly, eg:

      syncPolicy:
        syncOptions:
          - CreateNamespace=true
  templatePatch: |-
    {{`{{ if .autoSync }}
    spec:
      syncPolicy:
        syncOptions:
        - CreateNamespace=true
      syncPolicy:
        automated:
          prune: true
          selfHeal: true
    {{ end }}`}}

But it seems very unexpected behaviour that a misconfigured applicationset such as this should cause the UI to become unavailable

Screenshots

Once the broken patch has been synced by ArgoCD, this is what the UI does. Once the broken template patch has been reverted, the UI returns to usual working state

Version

argocd: v2.10.1+a79e0ea.dirty
  BuildDate: 2024-02-14T22:23:04Z
  GitCommit: a79e0eaca415461dc36615470cecc25d6d38cefb
  GitTreeState: dirty
  GoVersion: go1.21.7
  Compiler: gc
  Platform: darwin/arm64
argocd-server: v2.10.2+fcf5d8c
  BuildDate: 2024-03-01T21:24:51Z
  GitCommit: fcf5d8c2381b68ab1621b90be63913b12cca2eb7
  GitTreeState: clean
  GoVersion: go1.21.3
  Compiler: gc
  Platform: linux/amd64
  Kustomize Version: v5.2.1 2023-10-19T20:13:51Z
  Helm Version: v3.14.2+gc309b6f
  Kubectl Version: v0.26.11
  Jsonnet Version: v0.20.0

Logs Surprisingly, nothing stand out in the logs

[Killpit]

It's not an issue related to ArgoCD, it's related to JavaScript/TypeScript. And one piece of advice, I'd recommend you update your go and Kubernetes versions up to date. I think you should look at the error for JavaScript and then we can proceed from here.

[ckav370]

FYI- this vanilla Argo running the recommended upstream container image as per the helm chart, this also includes Go. Running on EKS version 1.28

[crenshaw-dev]

@Killpit Argo CD ships with JavaScript for the UI. This problem should be unrelated to the go and Kubernetes versions. @ckav370 has already posted the (redacted) JS error.

[Killpit]

I know, it's just a piece of advice, I think we need to see the application he created.

[jgwest]

Dupe of https://github.com/argoproj/argo-cd/issues/15545 (albeit w/o the same repro steps)?

[Killpit]

Dupe of #15545 (albeit w/o the same repro steps)?

Looks like it, yup it's quite same, we don't know other tools that are being used here and I think this issue can be a good reference point for @ckav370

[olehArabskyi]

I have received same error. In my case it was an issue with one of ArgoCD CRD "Application". After deletion of broken CRD the error is gone.

[ckav370]

I actually noticed this error again by adding a small change to an applicationset but refreshing the UI is resolved. After fixing the template patch from the original issue, I updated an appset adding releaseName: "{{ {{.values.env}}}}" as below which seems to be the only change. This error has not reoccured yet and i have combed the repo server logs but see nothing unusual

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: name
  namespace: argocd
spec:
  syncPolicy:
    preserveResourcesOnDeletion: true
  ignoreApplicationDifferences:
    - jsonPointers:
        - /spec/source/targetRevision
  goTemplate: true
  goTemplateOptions: ["missingkey=error"]
  generators:
  - matrix:
      generators:
      - list:
          elements:
          - cluster: cluster
            url: url
            branch: main
            autoSync: false
      - git:
          repoURL: https://github.com/repo.git
          revision: main
          files:
          - path: env/cluster/*.yaml
          values:
            env: |-
              {{"{{`{{ trimSuffix \".yaml\" .path.filename }}`}}"}}
            app: |-
              {{"{{`{{ index .path.segments 1 }}`}}"}}
  template:
    metadata:
      name: "{{ `{{.values.app}}` }}-{{ `{{.values.env}}` }}"
    spec:
      project: my-project
      source:
        repoURL: https://github.com/repos.git
        targetRevision: "{{ `{{ .branch }}` }}" 
        path: charts/{{ `{{.values.env}}`}}
        helm:
          releaseName: "{{ `{{.values.env}}` }}" -> adding this 
          valueFiles:
          - values.yaml
          - "../../env/{{ `{{.cluster}}` }}/{{ `{{.values.env}}` }}.yaml" 
      destination:
        server: "{{ `{{ .url }}` }}"
        namespace: "{{ `{{.values.env}}` }}"
      syncPolicy:
        syncOptions:
          - CreateNamespace=true
          - ServerSideApply=true
  templatePatch: |-
    {{`{{ if .autoSync }}
    spec:
      syncPolicy:
        syncOptions:
        - CreateNamespace=true
        - ServerSideApply=true
      syncPolicy:
        automated:
          prune: true
          selfHeal: true
    {{ end }}`}}