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# Copyright 2013 OpenStack Foundation
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
# If we're running on a cloud server with no swap, fix that:
if [ `grep SwapTotal /proc/meminfo | awk '{ print $2; }'` -eq 0 ]; then
if [ -b /dev/vdb ]; then
elif [ -b /dev/xvde ]; then
MEMKB=`grep MemTotal /proc/meminfo | awk '{print $2; }'`
# Use the nearest power of two in MB as the swap size.
# We also shift by 8MB to start the partitions as apparently
# parted and linux prefer things aligned on multiples of 8.
# This ensures that the partitions below are aligned properly.
MEM=`python3 -c "import math ; print(min(2**int(round(math.log($MEMKB/1024, 2))),8192) + 8)"`
# Avoid using config drive device for swap
if [ -n "$DEV" ] && ! blkid | grep $DEV | grep TYPE ; then
if mount | grep ${DEV} > /dev/null; then
echo "*** ${DEV} appears to already be mounted"
echo "*** ${DEV} unmounting and reformating"
umount ${DEV}
parted ${DEV} --script -- \
mklabel msdos \
mkpart primary linux-swap 8 ${MEM} \
mkpart primary ext2 ${MEM} -1
# We are only interested in scanning $DEV, not all block devices
sudo partprobe ${DEV}
# The device partitions might not show up immediately, make sure
# they are ready and available for use
udevadm settle --timeout=0 || echo "Block device not ready yet. Waiting for up to 10 seconds for it to be ready"
udevadm settle --timeout=10 --exit-if-exists=${DEV}1
udevadm settle --timeout=10 --exit-if-exists=${DEV}2
mkswap ${DEV}1
# The default ratio is 16384 bytes per inode or so. Reduce that to 8192
# bytes per inode so that we get roughly twice the number of inodes as
# by default. This should still be well above the block size of 4096.
# We do this because we have found in at least a couple locations that
# more inodes is useful and is painful to fix after the fact.
mkfs.ext4 -i 8192 ${DEV}2
swapon ${DEV}1
mount ${DEV}2 /mnt
rsync -a /opt/ /mnt/
umount /mnt
perl -nle "m,${DEV}, || print" -i /etc/fstab
echo "${DEV}1 none swap sw 0 0" >> /etc/fstab
echo "${DEV}2 /opt ext4 errors=remount-ro,barrier=0 0 2" >> /etc/fstab
elif [ ! -f "$SWAPFILE" ] ; then
# We don't have real devices to use so we make a swap file instead.
# Note you can skip this by precreating /swapfile.
# bs here is 1Mb
sudo dd if=/dev/zero of=${SWAPFILE} bs=1048576 count=${MEM}
sudo chown root:root $SWAPFILE
sudo chmod 600 $SWAPFILE
sudo mkswap $SWAPFILE
echo "${SWAPFILE} none swap sw 0 0" >> /etc/fstab
swapon -a
mount -a