User talk:M0p/Root on ZFS Native Encryption with Boot Environment

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Generate zfs-list.cache using zed can be made to work

In User:M0p/Root_on_ZFS_Native_Encryption#Generate_zfs-list.cache you write

As of this writing, manually invoking zed does not work for me. How to generate the cache can be found in /etc/zfs/zed.d/history_event-zfs-list-cacher.sh, basically the cache is a list of dataset properties in a specific order in /etc/zfs/zfs-list.cache/pool.

I dug into this a bit and found that zed actually calls history_event-zfs-list-cacher.sh, but this exits without doing anything due to a call to zed_exit_if_ignoring_this_event, a function from zed-functions.sh. Looking at this function, it seems to be targeted at the syslog hook, to ignore certain history_events. I don't think calling this function is correct here, and indeed removing it solves the problem and the zfs-list.cache is correctly updated when e.g. changing a mountpoint= property.

This is a bug in history_event-zfs-list-cacher.sh and already reported and fixed upstream.

This still leaves the problem of mounting the boot-dataset even though it has canmount=noauto. Though the only way to fix this is probably to modify the script and/or add a specific org.openzfs.systemd:mount_even_if_canmount_noauto or sth. in that spirit. What do you think?

J05hv4 (talk) 15:31, 27 December 2020 (UTC)

Hi! Thanks for the feedback! I've updated information regarding list cacher in the article with the info you provided.
As for mounting /boot dataset: yes, I think it is a sensible approach to add a custom property to persuade zfs-mount-generator to mount /boot dataset despite canmount=noauto. However before they implement this, the only way to go seems to be just replacing noauto with on, as described in the article. M0p (talk) 01:10, 28 December 2020 (UTC)
Just found out why / will mount despite canmount=noauto, it's this commit. Maybe we could do something similar for /boot. M0p (talk) 05:28, 30 December 2020 (UTC)


A simpler solution for mounting boot dataset: just use legacy mountpoint and mount it with /etc/fstab! It's more reliable and, the boot environment tool I ported from FreeBSD, bieazAUR supports this. M0p (talk) 06:33, 8 January 2021 (UTC)