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Address races in NBD and images

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This commit is contained in:
Dean Troyer 2011-10-31 16:59:02 -05:00
parent 2dfdbc9e65
commit 71745fe62a
1 changed files with 23 additions and 12 deletions
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35
tools/get_uec_image.sh
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@ -51,6 +51,7 @@ fi
# Default args
DIST_NAME=$1
IMG_FILE=$2
IMG_FILE_TMP=`mktemp $IMG_FILE.XXXXXX`
case $FORMAT in
kvm|qcow2) FORMAT=qcow2
@ -88,11 +89,6 @@ case $DIST_NAME in
;;
esac
# Set up nbd
modprobe nbd max_part=63
NBD=${NBD:-/dev/nbd9}
NBD_DEV=`basename $NBD`
# Prepare the base image
# Get the UEC image
@ -103,24 +99,37 @@ fi
if [ "$FORMAT" = "qcow2" ]; then
# Just copy image
cp -p $CACHEDIR/$UEC_NAME-disk1.img $IMG_FILE
cp -p $CACHEDIR/$UEC_NAME-disk1.img $IMG_FILE_TMP
else
# Convert image
qemu-img convert -O $QFORMAT $CACHEDIR/$UEC_NAME-disk1.img $IMG_FILE
qemu-img convert -O $QFORMAT $CACHEDIR/$UEC_NAME-disk1.img $IMG_FILE_TMP
fi
# Resize the image if necessary
if [ $ROOTSIZE -gt 2000 ]; then
# Resize the container
qemu-img resize $IMG_FILE +$((ROOTSIZE - 2000))M
qemu-img resize $IMG_FILE_TMP +$((ROOTSIZE - 2000))M
fi
# Connect to nbd and wait till it is ready
qemu-nbd -c $NBD $IMG_FILE
if ! timeout 60 sh -c "while ! [ -e /sys/block/$NBD_DEV/pid ]; do sleep 1; done"; then
echo "Couldn't connect $NBD"
# Set up nbd
modprobe nbd max_part=63
for i in `seq 1 15`; do
if [ ! -e /sys/block/nbd$i/pid ]; then
NBD=/dev/nbd$i
# Connect to nbd and wait till it is ready
qemu-nbd -c $NBD $IMG_FILE_TMP
if ! timeout 60 sh -c "while ! [ -e ${NBD}p1 ]; do sleep 1; done"; then
echo "Couldn't connect $NBD"
exit 1
fi
break
fi
done
if [ -z "$NBD" ]; then
echo "No free NBD slots"
exit 1
fi
NBD_DEV=`basename $NBD`
# Resize partition 1 to full size of the disk image
echo "d
@ -153,3 +162,5 @@ rm -f $MNTDIR/etc/resolv.conf
umount $MNTDIR
rmdir $MNTDIR
qemu-nbd -d $NBD
mv $IMG_FILE_TMP $IMG_FILE