ungleich-tools/opennebula-images/ubuntu-build-opennebula-image.sh

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2020-01-18 18:56:06 +00:00
#!/bin/sh
# This script generates Ubuntu images for OpenNebula.
#
# Test image locally (without network) with:
# qemu-system-x86_64 -enable-kvm -m 1G -drive file=$IMAGE,format=qcow2
set -e
set -x
# XXX: Handle command-line arguments?
RELEASE=jammy # 22.04 LTS
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ARCH=amd64
IMAGE_PATH=ubuntu-$RELEASE-$(date --iso-8601).img.qcow2
IMAGE_SIZE=10G
NBD_DEVICE=/dev/nbd0
# TODO: find the package definition and built ourself, publish in some RPM repository.
ONE_CONTEXT_DEB_URL="https://github.com/OpenNebula/addon-context-linux/releases/download/v6.4.0/one-context_6.4.0-1.deb"
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ONE_CONTEXT_DEB_PATH=/root/one-context.deb
cleanup() {
# The order here is important.
umount /mnt/dev/pts 2>/dev/null || true
umount /mnt/dev/shm 2>/dev/null || true
umount /mnt/dev 2>/dev/null || true
umount /mnt/proc 2>/dev/null || true
umount /mnt/run 2>/dev/null || true
umount /mnt/sys 2>/dev/null || true
umount /mnt/boot 2>/dev/null || true
umount /mnt 2>/dev/null || true
qemu-nbd --disconnect "$NBD_DEVICE" || true
}
run_root() {
chroot /mnt /usr/bin/env \
PATH=/sbin:/usr/sbin:/bin:/usr/bin \
sh -c "$*"
}
if [ "$(whoami)" != 'root' ]; then
echo "This script must be run as root." >&2
exit 1
fi
if [ $(lsb_release --short --id) != "Ubuntu" ]; then
echo "WARNING: this script has been designed to run on an Ubuntu system." >&2
echo "WARNING: Not running Ubuntu. Giving you 5 seconds to abort." >&2
sleep 5
fi
# Create base QCOW2 image.
qemu-img create -f qcow2 "$IMAGE_PATH" "$IMAGE_SIZE"
modprobe nbd max_part=16
qemu-nbd --connect="$NBD_DEVICE" "$IMAGE_PATH"
# Wait for qemu-nbd to settle.
sleep 1
# Don't forget to cleanup, even if the script crash.
trap cleanup EXIT
# Create partition table, format partitions.
sfdisk --no-reread "$NBD_DEVICE" <<EOF
1M,500M,L,*
,,L
EOF
mkfs.ext4 "${NBD_DEVICE}p1"
mkfs.ext4 "${NBD_DEVICE}p2"
# Mount partitions, install base OS.
mount "${NBD_DEVICE}p2" /mnt
mkdir /mnt/boot
mount "${NBD_DEVICE}p1" /mnt/boot
debootstrap \
--arch=$ARCH $RELEASE \
/mnt http://archive.ubuntu.com/ubuntu/
mount --bind /dev /mnt/dev
mount --bind /dev/pts /mnt/dev/pts
mount --bind /dev/shm /mnt/dev/shm
mount --bind /proc /mnt/proc
mount --bind /run /mnt/run
mount --bind /sys /mnt/sys
# Guest networking is to be handled by the one-context package.
# See https://github.com/OpenNebula/addon-context-linux for details.
# Required to resolve package mirror in chroot.
cp /etc/resolv.conf /mnt/etc/resolv.conf
# Initialize /etc/hosts.
cat > /mnt/etc/hosts << EOF
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
EOF
# Configure package sources and update package index.
cat >/mnt/etc/apt/sources.list <<EOF
deb http://archive.ubuntu.com/ubuntu/ $RELEASE main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ $RELEASE-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ $RELEASE-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ $RELEASE-backports main restricted universe multiverse
EOF
run_root apt-get update
# Install (magic?) one-context DEB and hope things works as expected.
curl -L "$ONE_CONTEXT_DEB_URL" > "/mnt$ONE_CONTEXT_DEB_PATH"
run_root apt-get -y install "$ONE_CONTEXT_DEB_PATH"
run_root rm "$ONE_CONTEXT_DEB_PATH"
# Manually install legacy network scripts used by one-context.
run_root apt-get -y install ifupdown
# Initalize base services.
run_root systemd-machine-id-setup
run_root ln -sf /usr/share/zoneinfo/UTC /etc/localtime
run_root systemctl enable systemd-timesyncd.service
# Install kernel and bootloader. Do not autoconfigure grub.
run_root echo "grub-pc grub-pc/install_devices_empty boolean true" | debconf-set-selections
run_root DEBIAN_FRONTEND=noninteractive apt-get -y install locales linux-base linux-image-generic grub-pc
# Configure grub.
run_root grub-install --target=i386-pc "${NBD_DEVICE}"
run_root grub-mkconfig -o /boot/grub/grub.cfg
# Install en configure SSH daemon.
run_root apt-get -y install openssh-server
# Generate fstab file.
boot_uuid=$(blkid --match-tag UUID --output value "${NBD_DEVICE}p1")
root_uuid=$(blkid --match-tag UUID --output value "${NBD_DEVICE}p2")
cat >>/mnt/etc/fstab <<EOF
UUID=$boot_uuid /boot ext4 rw,relatime,data=ordered 0 2
UUID=$root_uuid / ext4 rw,relatime,data=ordered 0 1
EOF
# Reset systemd's environment.
run_root rm -f /etc/machine-id
run_root touch /etc/machine-id
rm -f /var/lib/systemd/random-seed
# Remove temporary files and reclaim freed disk space.
run_root apt-get clean
# Make sure everything is written to disk before exiting.
sync