zfs-linux-lts-poscat sd-zfs compatibility with zfsbootmenu

[darkbasic]

Hi, I'm trying to boot Arch Linux with sd-zfs (from the zfs-linux-lts-poscat package) + zfsbootmenu (zfs set org.zfsbootmenu:commandline="rw" zroot/ROOT) + zfs-import-scan + zfs-mount-generator but I'm getting stuck at "Failing to start Switch Root":

HOOKS=(systemd sd-zfs autodetect microcode modconf kms keyboard sd-vconsole block filesystems fsck)

/etc/zfs/zfs-list.cache/zroot has been populated and /etc/zfs/zpool.cache does not exist.

If I switch to the zfs hook (HOOKS=(base udev autodetect microcode modconf kms keyboard keymap consolefont block zfs filesystems fsck)) it works:

zfsbootmenu ignores any root entry and forcefully provides a zfs=zroot/ROOT/arch parameter.
I don't know if that might the problem, because if you don't provide a root parameter it should default to the bootfs which has been correctly set (zpool set bootfs=zroot/ROOT/arch zroot).

Any idea how to debug/fix this issue?

Please note that I'm not using the whole zfs-linux-lts-poscat package (I want to use zfs-dkms-staging-git/zfs-utils-staging-git along with the latest stable kernel) but instead a trimmed down version which provides just the sd-zfs hook:

package_sd-zfs-poscat() {
    pkgdesc='ZFS mkinitcpio hook for systemd based initrds'

    install -Dvm644 "${srcdir}"/sd-zfs.initcpio.install "${pkgdir}"/usr/lib/initcpio/install/sd-zfs

    install -Dvm755 -t "${pkgdir}"/usr/lib/zfs/initcpio/ "${srcdir}"/{parse-cmdline,zfs-set-env,zfs-root-generator}
    install -Dvm755 -t "${pkgdir}"/usr/lib/systemd/system-shutdown/ "${srcdir}"/zfs.shutdown
}

If I manage to get it working with zfsbootmenu I would like to provide an sd-zfs-poscat AUR package, with your permission.

[lilacbot]

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[darkbasic]

#4168