core-admin/linux/aux-tools/prepare-volatile-img.sh

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#!/bin/sh
if [ "`id -u`" != "0" ]; then
exec sudo $0 $*
fi
set -e
if ! echo $PATH | grep -q sbin; then
PATH=$PATH:/sbin:/usr/sbin
fi
FILENAME=$1
ROOT_SIZE=$2
SWAP_SIZE=$[ 1024 ]
if [ -z "$ROOT_SIZE" -o -z "$FILENAME" ]; then
echo "Usage: $0 <filename> <root.img size in MB>"
exit 1
fi
if [ -e "$FILENAME" ]; then
echo "$FILENAME already exists, not overriding"
exit 1
fi
TOTAL_SIZE=$[ $ROOT_SIZE + $SWAP_SIZE + 512 ]
truncate -s ${TOTAL_SIZE}M "$FILENAME"
sfdisk --no-reread -u M "$FILENAME" > /dev/null 2> /dev/null <<EOF
0,${SWAP_SIZE},S
,${ROOT_SIZE},L
EOF
(
flock 200
loopdev=`losetup -f --show --partscan "$FILENAME"`
udevadm settle
created=
if [ ! -e ${loopdev}p1 ]; then
# device wasn't created automatically, probably udev isn't running;
# create devs manually
for partdev in /sys/block/$(basename ${loopdev})/loop*p*; do
mknod /dev/$(basename ${partdev}) b $(cat ${partdev}/dev | tr : ' ')
done
created=yes
fi
mkswap -f ${loopdev}p1 > /dev/null
if [ "$created" = "yes" ]; then
rm -f ${loopdev}p*
fi
losetup -d ${loopdev} || :
chown --reference `dirname "$FILENAME"` "$FILENAME"
) 200>"/var/run/qubes/prepare-volatile-img.lock"