dracut module for loop mounting a root filesystem

loopmount.sh

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh

if getargbool 0 rd.loop; then
        info "Mount /sysroot as r/w"
	mount -o remount,rw /sysroot
        mkdir /run/initramfs/loop
        mount -o bind /sysroot /run/initramfs/loop
        umount /sysroot
        info "Mount /sysroot/loop.img to /sysroot"
	mount -o loop /run/initramfs/loop/loop.raw /sysroot
	need_shutdown
fi

loopumount.sh

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh

if getargbool 0 rd.loop; then
        info "Unmount /run/iniramfs/loop"
        umount /oldsys/run/initramfs/loop
fi

module-setup.sh

#!/bin/bash
check() {
	return 0
}

depends() {
	return 0
}

installkernel() {
	instmods loop
}

install() {
	inst_hook pre-pivot 99 "$moddir/loopmount.sh"
  inst_hook shutdown 99 "$moddir/loopumount.sh"
}