#
# Global Variables
#
ZPOOL_FORCE="" # Force import of zfs pools
ZFS_DATASET="" # The type of zfs pool to mount

#
# mkinitcpio hooks
#
run_hook() {
    # Force import the pools, useful if the pool has not properly been exported
    # using 'zpool export <pool>'
    [[ $zfs_force == 1 ]] && ZPOOL_FORCE='-f'

    # zfs specified on the kernel command line contains the type of dataset to
    # mount
    case $zfs in
        "")
            # skip this dataset
            ;;
        auto|bootfs)
            ZFS_DATASET='bootfs'
            ;;
        *)
            ZFS_DATASET=$zfs
            ;;
    esac

    # Set the mount handler function in mkinitcpio
    mount_handler="zfs_mount_handler"

    # Check for the hostid. An improper hostid is one reason why pools would
    # refuse to import.
    if [ ! -f "/etc/hostid" ] ; then
        echo "ZFS: No hostid found on kernel command line or /etc/hostid. ZFS pools may not import correctly."
    fi

    # Allow up to 10 seconds for zfs device to show up
    for i in 1 2 3 4 5 6 7 8 9 10; do
        [ -c "/dev/zfs" ] && break
        sleep 1
    done
}


run_latehook () {
    /usr/bin/zpool import -N -a $ZPOOL_FORCE
    # Mount the remaining
    local node=$1
    /usr/bin/zfs list -H -o name -t filesystem -r $ZFS_DATASET | while read -r ZFS_CHILDREN_DATASET ; do
        local mountpoint=$("/usr/bin/zfs" get -H -o value mountpoint $ZFS_CHILDREN_DATASET)
        if [ "$mountpoint" = "legacy" ] ; then
            echo "ZFS: mounting legacy don't work with this hack: $ZFS_CHILDREN_DATASET"
            #mount -t zfs -o ${rwopt_exp} "$ZFS_CHILDREN_DATASET" "$node"
            return 1
        else
            mount -o zfsutil,${rwopt_exp} -t zfs "$ZFS_CHILDREN_DATASET" "$node/$mountpoint"
        fi

    done
}

#
# Helper Functions
#
zfs_mount_handler () {
    # Import the bootfs datasets if zfs=bootfs
    if [ "$ZFS_DATASET" = "bootfs" ] ; then
        if ! zfs_get_bootfs_datasets ; then
            # Lets import everything and try again
            /usr/bin/zpool import -N -a $ZPOOL_FORCE
            if ! zfs_get_bootfs_datasets ; then
                echo "ZFS: Cannot find any bootfs datasets!"
                return 1
            fi
        fi
    fi

    local pool="${ZFS_DATASET%%/*}" # Get datasets without /
    local zpool_import_flags=""
    local rwopt_exp=${rwopt:-ro} # rw option on kernel cmd line, ro is default

    echo "ZFS_DATASET: $ZFS_DATASET"
    echo "pool: $pool"
    echo "rwopt_exp: $rwopt_exp"

    # Attempt to import pools automatically
    if ! "/usr/bin/zpool" list -H $pool 2>&1 > /dev/null ; then
        if [ "$rwopt_exp" != "rw" ]; then
            msg "ZFS: Importing pool $pool readonly."
            zpool_import_flags="-o readonly=on"
        fi
        msg "ZFS: Importing pool $pool."
        if ! "/usr/bin/zpool" import $zpool_import_flags -N $pool $ZPOOL_FORCE ; then
            echo "ZFS: Unable to import pool $pool."
            return 1
        fi
    fi

    # Remaining mounts are done in run_latehook()
}

zfs_get_bootfs_datasets () {
    for zfs_dataset in $(/usr/bin/zpool list -H -o bootfs); do
        case ${zfs_dataset} in
            "" | "-")
                # skip this dataset
                ;;
            "no pools available")
                return 1
                ;;
            *)
                ZFS_DATASET=${zfs_dataset}
                return 0
                ;;
        esac
    done
    return 1
}
# vim:set ts=4 sw=4 ft=sh et: