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initramfs: add support for root.img with partition table

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Installing grub on root.img require some space before the filesystem.
Create it by adding partition table to root.img. This commit take care
of assembling dmroot device when such partition table is present, while
preserving compatibility with partition-less images.

QubesOS/qubes-issues#2577
This commit is contained in:
Marek Marczykowski-Górecki 2017-01-23 23:52:15 +01:00
parent 5c7c54adab
commit d0fe5e6f9a
No known key found for this signature in database
GPG Key ID: 063938BA42CFA724
2 changed files with 43 additions and 11 deletions
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28
dracut/full-dmroot/qubes_cow_setup.sh
View File

@ -56,14 +56,21 @@ log_begin "Waiting for /dev/xvda* devices..."
while ! [ -e /dev/xvda ]; do sleep 0.1; done
log_end
# prefer first partition if exists
if [ -b /dev/xvda1 ]; then
ROOT_DEV=xvda1
else
ROOT_DEV=xvda
fi
SWAP_SIZE=$(( 1024 * 1024 * 2 )) # sectors, 1GB
if [ `cat /sys/block/xvda/ro` = 1 ] ; then
if [ `cat /sys/class/block/$ROOT_DEV/ro` = 1 ] ; then
log_begin "Qubes: Doing COW setup for AppVM..."
while ! [ -e /dev/xvdc ]; do sleep 0.1; done
VOLATILE_SIZE=$(cat /sys/block/xvdc/size) # sectors
ROOT_SIZE=$(cat /sys/block/xvda/size) # sectors
VOLATILE_SIZE=$(cat /sys/class/block/xvdc/size) # sectors
ROOT_SIZE=$(cat /sys/class/block/$ROOT_DEV/size) # sectors
if [ $VOLATILE_SIZE -lt $SWAP_SIZE ]; then
die "volatile.img smaller than 1GB, cannot continue"
fi
@ -78,7 +85,7 @@ EOF
mkswap /dev/xvdc1
while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
echo "0 `cat /sys/block/xvda/size` snapshot /dev/xvda /dev/xvdc2 N 16" | \
echo "0 `cat /sys/class/block/$ROOT_DEV/size` snapshot /dev/$ROOT_DEV /dev/xvdc2 N 16" | \
dmsetup --noudevsync create dmroot || die "Qubes: FATAL: cannot create dmroot!"
log_end
else
@ -92,8 +99,17 @@ EOF
fi
while ! [ -e /dev/xvdc1 ]; do sleep 0.1; done
mkswap /dev/xvdc1
echo "0 `cat /sys/block/xvda/size` linear /dev/xvda 0" | \
dmsetup --noudevsync create dmroot || die "Qubes: FATAL: cannot create dmroot!"
if [ "$ROOT_DEV" = "xvda1" ]; then
# grub2-probe for some reason can't parse dm-linear pointing at
# partition device directly, but can when it points at it indirectly
# through base device and offset; lets make life easier for users of
# grub2-install
DM_ROOT="/dev/xvda $(cat /sys/class/block/$ROOT_DEV/start)"
else
DM_ROOT="/dev/$ROOT_DEV 0"
fi
echo "0 `cat /sys/class/block/$ROOT_DEV/size` linear $DM_ROOT" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; exit 1; }
log_end
fi
dmsetup mknodes dmroot

26
dracut/simple/init.sh
View File

@ -20,14 +20,21 @@ die() {
echo "Waiting for /dev/xvda* devices..."
while ! [ -e /dev/xvda ]; do sleep 0.1; done
# prefer first partition if exists
if [ -b /dev/xvda1 ]; then
ROOT_DEV=xvda1
else
ROOT_DEV=xvda
fi
SWAP_SIZE=$(( 1024 * 1024 * 2 )) # sectors, 1GB
if [ `cat /sys/block/xvda/ro` = 1 ] ; then
if [ `cat /sys/class/block/$ROOT_DEV/ro` = 1 ] ; then
echo "Qubes: Doing COW setup for AppVM..."
while ! [ -e /dev/xvdc ]; do sleep 0.1; done
VOLATILE_SIZE=$(cat /sys/block/xvdc/size) # sectors
ROOT_SIZE=$(cat /sys/block/xvda/size) # sectors
VOLATILE_SIZE=$(cat /sys/class/block/xvdc/size) # sectors
ROOT_SIZE=$(cat /sys/class/block/$ROOT_DEV/size) # sectors
if [ $VOLATILE_SIZE -lt $SWAP_SIZE ]; then
die "volatile.img smaller than 1GB, cannot continue"
fi
@ -43,7 +50,7 @@ EOF
mkswap /dev/xvdc1
while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
echo "0 `cat /sys/block/xvda/size` snapshot /dev/xvda /dev/xvdc2 N 16" | \
echo "0 `cat /sys/class/block/$ROOT_DEV/size` snapshot /dev/$ROOT_DEV /dev/xvdc2 N 16" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; exit 1; }
echo Qubes: done.
else
@ -57,7 +64,16 @@ EOF
fi
while ! [ -e /dev/xvdc1 ]; do sleep 0.1; done
mkswap /dev/xvdc1
echo "0 `cat /sys/block/xvda/size` linear /dev/xvda 0" | \
if [ "$ROOT_DEV" = "xvda1" ]; then
# grub2-probe for some reason can't parse dm-linear pointing at
# partition device directly, but can when it points at it indirectly
# through base device and offset; lets make life easier for users of
# grub2-install
DM_ROOT="/dev/xvda $(cat /sys/class/block/$ROOT_DEV/start)"
else
DM_ROOT="/dev/$ROOT_DEV 0"
fi
echo "0 `cat /sys/class/block/$ROOT_DEV/size` linear $DM_ROOT" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; exit 1; }
echo Qubes: done.
fi