CSI plugin should support backup migrated PVCs

[blackpiglet]

Describe the problem/challenge you have

CSI plugin judges a PVC whether is a CSI one by it has a CSI section in SPEC.

https://github.com/vmware-tanzu/velero-plugin-for-csi/blob/5ee80604e580295e9afea51fcf73765b070a9ca7/internal/backup/pvc_action.go#L82-L85

This will rule out the migrated PVC.

Describe the solution you'd like

Need a new way to also handle the migrated PVCs.

Anything else you would like to add:

Environment:

• Velero version (use velero version):
• Kubernetes version (use kubectl version):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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[anshulahuja98]

I am not sure if migrated PVCs can be snapshotted by the external snapshotter. it is not fully clear to me what this issue is meant to tackle.

[blackpiglet]

I just found this issue. You are right. Even Velero CSI plugin supports it, but the external-snapshotter doesn't support it too.

[anshulahuja98]

yeah thanks for updating the thread with the issue link It is a major limitation of CSI for in tree.

[anshulahuja98]

We can delink the 1.12 milestone