Mounting volume when NFS4 is not available on the host system

[conneryn]

Summary:

NFS4 is required on the users host computer in order to successfully mount volumes using czctl. This requirement should be clearly communicated to the user, and if it is missing, the user should be provided helpful/clear messaging of what needs to be done.

To Reproduce:

Steps to reproduce the behavior:

1. Use clean Ubuntu installation
2. Install czctl
3. Try to mount a deployment
4. See error

Observed Results:

A warning is displayed that mount was provided "bad options", however this is not immediately clear why this failed.

Expected Behavior:

Use should receive a more detailed error message saying that NFS4 must be installed.

Ideally this would include specific instructions on how to fix the issue. (ex: sudo apt install nfs-common)

Screenshots:

Failure Logs

mount: /home/connery/mnt: bad option; for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount. helper program.