qubes-linux-kernel/vm-initramfs/pre-udev/90_qubes_cow_setup.sh

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#
# This file should be places in pre-mount directory in dracut's initramfs
#
#!/bin/sh
echo "Qubes initramfs script here:"
if [ -e /dev/mapper/dmroot ] ; then
die "Qubes: FATAL error: /dev/mapper/dmroot already exists?!"
fi
modprobe xenblk || modprobe xen-blkfront || echo "Qubes: Cannot load Xen Block Frontend..."
echo "Waiting for /dev/xvda* devices..."
while ! [ -e /dev/xvda ]; do sleep 0.1; done
if [ `blockdev --getro /dev/xvda` = 1 ] ; then
echo "Qubes: Doing COW setup for AppVM..."
while ! [ -e /dev/xvdc ]; do sleep 0.1; done
while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
echo "0 `blockdev --getsz /dev/xvda` snapshot /dev/xvda /dev/xvdc2 P 16" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; }
echo Qubes: done.
else
echo "Qubes: Doing R/W setup for TemplateVM..."
echo "0 `blockdev --getsz /dev/xvda` linear /dev/xvda 0" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; exit 1; }
echo Qubes: done.
fi