51 lines
1.4 KiB
Bash
51 lines
1.4 KiB
Bash
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#!/usr/bin/ash
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run_earlyhook() {
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msg "Starting Qubes copy on write setup script"
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if ! grep -q 'root=[^ ]*dmroot' /proc/cmdline; then
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warning "Qubes: dmroot not requested, probably not a Qubes VM"
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exit 0
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fi
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if [ -e /dev/mapper/dmroot ] ; then
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die "Qubes: FATAL error: /dev/mapper/dmroot already exists?!"
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fi
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modprobe xen-blkfront || warning "Qubes: Cannot load Xen Block Frontend..."
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msg "Qubes: Waiting for /dev/xvda* devices..."
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while ! [ -e /dev/xvda ]; do sleep 0.1; done
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msg "Qubes: /dev/xvda* found"
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SWAP_SIZE=$(( 1024 * 1024 * 2 )) # sectors, 1GB
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if [ `cat /sys/block/xvda/ro` = 1 ] ; then
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msg "Qubes: Doing COW setup for AppVM..."
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while ! [ -e /dev/xvdc ]; do sleep 0.1; done
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VOLATILE_SIZE=$(cat /sys/block/xvdc/size) # sectors
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ROOT_SIZE=$(cat /sys/block/xvda/size) # sectors
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if [ $VOLATILE_SIZE -lt $SWAP_SIZE ]; then
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die "Qubes: volatile.img smaller than 1GB, cannot continue"
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fi
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sfdisk -q --unit S /dev/xvdc >/dev/null <<EOF
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1,$SWAP_SIZE,S
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,,L
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EOF
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if [ $? -ne 0 ]; then
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die "Qubes: failed to setup partitions on volatile device"
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fi
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while ! [ -e /dev/xvdc1 ]; do sleep 0.1; done
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mkswap /dev/xvdc1
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while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
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echo "0 `cat /sys/block/xvda/size` snapshot /dev/xvda /dev/xvdc2 N 16" | \
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dmsetup --noudevsync create dmroot || die "Qubes: FATAL: cannot create dmroot!"
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fi
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dmsetup mknodes dmroot
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}
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