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init: add support for force importing ZFS pool and ZFS native encryption

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -279,6 +279,25 @@

 	esac

 }

+# Do some tasks to make sure mounting the ZFS pool is A-OK

+prepare_zfs_root() {

+	local _root_vol=${KOPT_root#ZFS=}

+	local _root_pool=${_rool_vol%%/*}

+

+	# Force import if this has been imported on a different system previously

+	if [ "$KOPT_zfs_force" = 1 ]; then

+		zpool import -N -f $_root_vol

+	fi

+

+	# Ask for encryption password

+	if [ $(zpool list -H -o feature@encryption $_root_pool) = "active" ]; then

+		local _encryption_root=$(zfs get -H -o value encryptionroot $_root_vol)

+		if [ "$_encryption_root" != "-" ]; then

+			eval zfs load-key $_encryption_root

+		fi

+	fi

+}

+

 /bin/busybox mkdir -p /usr/bin /usr/sbin /proc /sys /dev $sysroot \

         /media/cdrom /media/usb /tmp /run

@@ -484,6 +503,9 @@

 		mkdir -p /media/root-rw/work /media/root-rw/root

 		mount -t overlay -o lowerdir=/media/root-ro,upperdir=/media/root-rw/root,workdir=/media/root-rw/work overlayfs $sysroot

 	else

+		if [ $rootfstype = "zfs" ]; then

+			prepare_zfs_root

+		fi

 		mount ${rootfstype:+-t} ${rootfstype} \

 			-o ${KOPT_rootflags:-ro} \

 			${KOPT_root#ZFS=} $sysroot

--- a/mkinitfs-bootparam.7.in

+++ b/mkinitfs-bootparam.7.in

@@ -119,6 +119,10 @@

 \fBusbdelay=\fINUMBER\fR

 Wait \fINUMBER\fR seconds for USB devices to show up before searching for boot

 media.

+.TP

+\fBzfs_force=\fINUMBER\fR

+Enable force importing the root zpool on boot, even if it was previously mounted

+from a different system/OS.

 .SH FILES

 .TP

 \fI@datadir@/initramfs-init\fR