efi.rs: ensure writable ESP mount

[ruihe774]

Just like what we do with /boot.

[openshift-ci]

Hi @ruihe774. Thanks for your PR.

I'm waiting for a coreos member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[travier]

Could you clarify why we need that? Thanks

[ruihe774]

Could you clarify why we need that? Thanks

For the scenario that ESP is mounted read-only.

We have the handling for /boot and IMO it is supposed to also have it with /boot/efi. The meaning of mounting /boot read-only is to prevent accidentally modifications to it and I think it is also true for /boot/efi.

[cgwalters]

/ok-to-test