When bootfs is a snapshot, boot into the snapshot readonly

[taliaferro]

Right now, if I set bootfs=zroot/ROOT/alpine@mysnapshot, ZFSBootMenu still shows the right filesystem (booting into zroot/ROOT/alpine@mysnapshot) but when it actually boots, it just boots the parent filesystem (zroot/ROOT/alpine) as normal.

I'd argue that if the bootfs is set to a snapshot, it makes more sense to try to boot into that snapshot as readonly.

[zdykstra]

It's up to the Alpine initramfs to handle zroot/ROOT/alpine@mysnapshot . ZBM can only verify that the snapshot is bootable (e.g. has a valid /boot). I don't know of any initramfs that supports booting from a read-only ZFS snapshot, and I expect that there are probably quite a few issues on every distro with supporting that use case.

[taliaferro]

Oh interesting; fair enough.