validate parameters volgroup with vgpattern in StorageClass

[mittachaitu]

Describe the problem/challenge you have If the user specifies both volgroup & vgpattern in StorageClass parameters currently, volgroup will take more precedence and in end, LVM volume will be created on user-specified volgroup. This behavior is good if volgroup value is sub-pattern of vgpattern but if both volgroup and vgpattern differs then CSI driver should error out about discrepancy instead of silently accepting the changes.

Note: Since volgroup is a subpattern of vgpattern good to have only vgpattern support.

Describe the solution you'd like [A clear and concise description of what you want to happen.]

• Add validation during CreateVolume request if both volgroup and vgpattern are specified and if they are not matching then the driver should error out.

Note: This validation will also handle backward compatibility issues.

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.] No

Environment:

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