5428ce06ee
This hook require new device nodes to appear in /dev. If devtmpfs is
used, it's not a problem ("simple" initramfs case), but otherwise udevd
is needed - and it isn't running in pre-udev hook yet.
QubesOS/qubes-issues#2577
(cherry picked from commit 5c7c54adab)
100 lines
2.7 KiB
Bash
100 lines
2.7 KiB
Bash
#!/bin/sh
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#
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# This file should be placed in pre-trigger directory in dracut's initramfs, or
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# scripts/local-top in case of initramfs-tools
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#
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# initramfs-tools (Debian) API
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PREREQS=""
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case "$1" in
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prereqs)
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# This runs during initramfs creation
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echo "$PREREQS"
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exit 0
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;;
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esac
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# This runs inside real initramfs
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if [ -r /scripts/functions ]; then
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# We're running in Debian's initramfs
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. /scripts/functions
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alias die=panic
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alias info=true
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alias warn=log_warning_msg
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alias log_begin=log_begin_msg
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alias log_end=log_end_msg
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elif [ -r /lib/dracut-lib.sh ]; then
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. /lib/dracut-lib.sh
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alias log_begin=info
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alias log_end=true
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else
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die() {
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echo "$@"
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exit 1
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}
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alias info=echo
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alias warn=echo
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alias log_begin=echo
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alias log_end=true
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fi
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info "Qubes initramfs script here:"
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if ! grep -q 'root=[^ ]*dmroot' /proc/cmdline; then
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warn "dmroot not requested, probably not a Qubes VM"
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exit 0
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fi
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if [ -e /dev/mapper/dmroot ] ; then
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die "Qubes: FATAL error: /dev/mapper/dmroot already exists?!"
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fi
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modprobe xenblk || modprobe xen-blkfront || warn "Qubes: Cannot load Xen Block Frontend..."
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log_begin "Waiting for /dev/xvda* devices..."
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while ! [ -e /dev/xvda ]; do sleep 0.1; done
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log_end
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SWAP_SIZE=$(( 1024 * 1024 * 2 )) # sectors, 1GB
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if [ `cat /sys/block/xvda/ro` = 1 ] ; then
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log_begin "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 $SWAP_SIZE ]; then
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die "volatile.img smaller than 1GB, cannot continue"
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fi
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sfdisk -q --unit S /dev/xvdc >/dev/null <<EOF
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1,$SWAP_SIZE,S
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,,L
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EOF
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if [ $? -ne 0 ]; then
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die "Qubes: failed to setup partitions on volatile device"
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fi
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while ! [ -e /dev/xvdc1 ]; do sleep 0.1; done
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mkswap /dev/xvdc1
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while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
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echo "0 `cat /sys/block/xvda/size` snapshot /dev/xvda /dev/xvdc2 N 16" | \
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dmsetup --noudevsync create dmroot || die "Qubes: FATAL: cannot create dmroot!"
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log_end
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else
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log_begin "Qubes: Doing R/W setup for TemplateVM..."
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while ! [ -e /dev/xvdc ]; do sleep 0.1; done
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sfdisk -q --unit S /dev/xvdc >/dev/null <<EOF
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1,$SWAP_SIZE,S
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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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echo "0 `cat /sys/block/xvda/size` linear /dev/xvda 0" | \
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dmsetup --noudevsync create dmroot || die "Qubes: FATAL: cannot create dmroot!"
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log_end
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fi
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dmsetup mknodes dmroot
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