Refactor: extract shared rewriteContainerVolumeMounts logic between storage provisioners

[rohanKanojia]

Summary

CommonStorageProvisioner.rewriteContainerVolumeMounts and PerWorkspaceStorageProvisioner.rewriteContainerVolumeMounts contain ~80 lines of nearly identical code. The only difference is a single expression in the SubPath computation.

Files

• pkg/provision/storage/commonStorage.go lines 136–214
• pkg/provision/storage/perWorkspaceStorage.go lines 101–179

What's duplicated

Both methods perform the same steps:

1. Build a devfileVolumes map from workspace components
2. Build an additionalVolumes map from podAdditions.Volumes
3. Build an overridesVolumes map via overrides.GetVolumesFromOverrides
4. Add the implicit projects volume
5. Define and call a rewriteVolumeMounts closure for both Containers and InitContainers
6. Append the PVC volume to podAdditions.Volumes

The only difference is the SubPath value:

// CommonStorage (line 190):
containers[cIdx].VolumeMounts[vmIdx].SubPath = fmt.Sprintf("%s/%s", workspaceId, vm.Name)

// PerWorkspaceStorage (line 155):
containers[cIdx].VolumeMounts[vmIdx].SubPath = vm.Name

Suggested fix

Extract a shared function (e.g., in pkg/provision/storage/shared.go) that accepts a subPathFunc parameter:

func rewriteContainerVolumeMounts(
    workspaceId, pvcName string,
    podAdditions *v1alpha1.PodAdditions,
    workspace *dw.DevWorkspaceTemplateSpec,
    restrictedFields []string,
    subPathFunc func(workspaceId, volumeName string) string,
) error {
    // ... shared logic ...
    containers[cIdx].VolumeMounts[vmIdx].SubPath = subPathFunc(workspaceId, vm.Name)
    // ...
}

Then each provisioner calls it with the appropriate SubPath transformation:

// CommonStorageProvisioner:
subPathFunc := func(wid, name string) string { return wid + "/" + name }

// PerWorkspaceStorageProvisioner:
subPathFunc := func(_, name string) string { return name }

Why this matters

When someone fixes a bug or adds a feature to the volume mount rewriting logic, they must update both methods identically. The identical // TODO: comment in both methods confirms they were copy-pasted and have already diverged in intent.

Verification

Run make test — existing tests for both storage provisioners should continue to pass with no changes.