Duplicate Value Causing Application Build Failures

Products

• VMware Tanzu Build Service

Issue/Introduction

Workloads may be generated by custom scripts and templates. In cases where there is logic to inject environment entries, such as spring.application.name, duplicate values may be injected into spec.template.spec.containers[0].env[]. This will result in failed application builds and an error shown below:

 

error    02-Apr-2025 02:32:03    Error waiting for ready condition: Failed to become ready: unable to apply object [####/####] for resource [config-provider] in supply chain [source-noscan-to-url]: create: PodIntent.conventions.carto.run "#####" is invalid: spec.template.spec.containers[0].env[11]: Duplicate value: map[string]interface {}{"name":"spring.application.name"}
simple    02-Apr-2025 02:32:03    Failing task since return code of [/opt/********/********-mvn-config/tanzu-tools/build-scripts/tanzu-execute-workload.sh -k /opt/********/********-mvn-config/tanzu-tools/config/kubeconfig-production-tap-build.yml -t true -w 30m] was 1 while expected 0
simple    02-Apr-2025 02:32:03    Finished task 'Tanzu create workload' with result: Failed

 

Create workload:
---
apiVersion: carto.run/v1alpha1
kind: Workload
metadata:

...
spec:
  env:
  - name: APP_NAME
    valueFrom:
      configMapKeyRef:
        key: APP_NAME
        name: ####
  - name: spring.application.name
    valueFrom:
      configMapKeyRef:
        key: spring.application.name
        name: ####
...

  - name: spring.application.name
    value: ####

Environment

TAP v1.12.2

Cause

In TAP v1.12.2, creatingPodIntent.conventions.carto.run on Kubernetes with duplicate entries at spec.template.spec.containers[0].env[] is not allowed any more.

Resolution

CRD validation is catching the duplicate fields error. It is a built in validation from KEP-2876. Customer will need to manually remove all duplicate keys.
 
https://github.com/kubernetes/kubernetes/blob/b4d139094698687043b36f1c378dfeb1b654198a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go#L66-L70