Patch Template Error In Argocd

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Introduction

Argo CD is a popular continuous deployment tool that automates the deployment of applications to Kubernetes clusters. One of its key features is the ability to use patch templates to customize the deployment process. However, users have reported encountering syntax errors while using patch templates, particularly when checking for the existence of a key called valuesfiles in the config.json file. In this article, we will explore the issue and provide a solution to resolve the patch template error in Argo CD.

Describe the Bug

The bug occurs when using Argo CD version 2.13.0 and attempting to use a patch template to check for the existence of a key called valuesfiles in the config.json file. The error message indicates that there is a syntax error while converting the template to JSON. The error message is as follows:

error while converting template to json "spec:\n source:\n repoURL: 'https://gitlab.industrysoftware.automation.siemens.com/chimera/kubernetes/argocd-xcr-config/podinfo-multival-approach2.git'\n targetRevision: 'HEAD'\n path: 'podinfo'\n {{ if hasKey .app \"valuesfile\" }}\n helm:\n ignoreMissingValueFiles: true\n valueFiles:\n {{- range $file := splitList \",\" .app.valuesfile }}\n - \"{{ $file | trim }}\"\n {{- end }}\n {{ end }}\n": yaml: line 7: could not find expected ':'

To Reproduce

To reproduce the bug, follow these steps:

  1. Create an Application Set configuration using the following YAML:
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: temp-patch
  namespace: xcr-argocd
spec:
  generators:
    - git:
        repoURL: "https://gitlab.industrysoftware.automation.siemens.com/gitops/team-xcr-examples.git"
        revision: HEAD
        files:
          - path: "apps/multival-approach2-config/**/config.json"
  template:
    metadata:
      name: '{{app.name}}-temp-patch'
    spec:
      project: temp-patch
      syncPolicy:
        automated:
          prune: true
          selfHeal: true
      destination:
        name: '{{app.clustername}}'
        namespace: '{{app.namespace}}'
  templatePatch: |
    spec:
      source:
        repoURL: '{{app.source}}'
        targetRevision: '{{app.revision}}'
        path: '{{app.path}}'
        {{- if hasKey .app "valuesfile" }}
        helm:
          ignoreMissingValueFiles: true
          valueFiles:
            {{- range $file := splitList "," .app.valuesfile }}
            - "{{ $file | trim }}"
            {{- end }}
        {{- end }}
  1. Apply the Application Set configuration using the following command:
argocd app set temp-patch --generate
  1. Observe the error message indicating a syntax error while converting the template to JSON.

Version

The bug occurs in Argo CD version 2.13.0.

Solution

To resolve the patch template error in Argo CD, follow these steps:

  1. Update the templatePatch section of the Application Set configuration to use the correct syntax for the if statement. The corrected syntax is as follows:
templatePatch: |
  spec:
    source:
      repoURL: '{{app.source}}'
      targetRevision: '{{app.revision}}'
      path: '{{app.path}}'
      {{- if hasKey .app "valuesfile" }}
      helm:
        ignoreMissingValueFiles: true
        valueFiles:
          {{- range $file := splitList "," .app.valuesfile }}
          - "{{ $file | trim }}"
          {{- end }}
      {{- end }}
  1. Apply the updated Application Set configuration using the following command:
argocd app set temp-patch --generate
  1. Verify that the patch template is rendered correctly without any syntax errors.

Conclusion

Introduction

In our previous article, we explored the patch template error in Argo CD and provided a solution to resolve the issue. However, we understand that users may still have questions about the patch template error and how to resolve it. In this article, we will provide a Q&A section to address some of the most frequently asked questions about the patch template error in Argo CD.

Q: What is the patch template error in Argo CD?

A: The patch template error in Argo CD occurs when the tool encounters a syntax error while converting the template to JSON. This error can occur when using patch templates to customize the deployment process.

Q: What is the cause of the patch template error in Argo CD?

A: The cause of the patch template error in Argo CD is typically due to a syntax error in the templatePatch section of the Application Set configuration. This can occur when using the if statement or other template functions.

Q: How do I resolve the patch template error in Argo CD?

A: To resolve the patch template error in Argo CD, you can update the templatePatch section of the Application Set configuration to use the correct syntax for the if statement. You can also try using the {{- if hasKey .app "valuesfile" }} syntax instead of {{ if hasKey .app "valuesfile" }}.

Q: What is the correct syntax for the if statement in Argo CD?

A: The correct syntax for the if statement in Argo CD is {{- if hasKey .app "valuesfile" }}. This syntax uses the - character to indicate that the if statement should be executed only if the condition is true.

Q: Can I use the if statement with other template functions in Argo CD?

A: Yes, you can use the if statement with other template functions in Argo CD. However, you should ensure that the syntax is correct and that the if statement is properly nested.

Q: How do I troubleshoot the patch template error in Argo CD?

A: To troubleshoot the patch template error in Argo CD, you can try the following steps:

  1. Check the templatePatch section of the Application Set configuration for syntax errors.
  2. Verify that the if statement is properly formatted and nested.
  3. Try using the {{- if hasKey .app "valuesfile" }} syntax instead of {{ if hasKey .app "valuesfile" }}.
  4. Check the Argo CD logs for any error messages related to the patch template error.

Q: Can I use patch templates with other Argo CD features?

A: Yes, you can use patch templates with other Argo CD features, such as Application Sets and ConfigMaps. However, you should ensure that the syntax is correct and that the patch template is properly formatted.

Conclusion

In this article, we provided a Q&A section to address some of the most frequently asked questions about the patch template error in Argo CD. We hope that this article has been helpful in resolving any questions or concerns you may have had about the patch template error in Argo CD. If you have any further questions or concerns, please don't hesitate to contact us.