Mounting a volume to container is not clear

[jamesla]

I am trying to attach a volume from a configmap to an init container but it is not entirely clear how to do it from the CRD spec. I've also been unable to find any examples of somebody doing this:

The code so far:

---
apiVersion: solr.apache.org/v1beta1
kind: SolrCloud
metadata:
  name: test
spec:
  replicas: 1
  customSolrKubeOptions:
    podOptions:
      volumes:
        - source: 
            configMap:
          name: configset
          defaultContainerMount:
            mountPath: /config
            name: config.xml
      sidecarContainer:
        - name: config-loader
          image: alpine/curl:latest
          command:
            - "sh"
            - "-c"
            - "ls -la /config"
          volumeMounts:
            - name: configset
              mountPath: /config

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: configset
data:
  config.xml: |
    <?xml version="1.0" encoding="UTF-8" ?>
     <config>
      ...
     </config>

It runs and the /config mount exists but it is always empty.

1. Are there any examples of volume mounts with this operator?
2. What am I doing wrong?

[mcarroll1]

I've encountered a similar issue here #675 (referencing an older issue here: #484).

I added a PR documenting an additional volume example: #739

[mcarroll1]

Turns out you can find the full spec here: https://github.com/apache/solr-operator/blob/main/config/crd/bases/solr.apache.org_solrclouds.yaml#L7038

[jamesla]

Thanks @mcarroll1 I did build that example by reading the full spec and I've read it a second time and I still can't seem to see what I'm doing wrong.

Does that example work for you? I'm wondering whether the feature (mapping configmaps as volumes) is broken?