Initial Fedora OpenNebula image definition

fedora-build-opennebula-image.sh

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+#!/bin/sh
+
+# This script generates Fedora images for OpenNebula, being heavily inspired
+# from srht's Fedora build image definition.
+
+# We could have used the Fedora Server Edition or even the @Core package group
+# (detailed below) but the result image would be quite large/bloated with
+# unecessary dependencies. This scheme allows maximum flexibility, and is
+# definitely opinionated.
+
+# Depends on the following packages (as of Fedora 31):
+#   qemu-img util-linux coreutils dnf curl
+
+# Run locally (without network) with:
+#   qemu-system-x86_64 -enable-kvm -m 1G -drive file=$IMAGE,format=qcow2
+
+set -e
+set -x
+
+# XXX: Handle command-line arguments?
+RELEASE=31
+ARCH=x86_64
+IMAGE_PATH=fedora-$RELEASE-$(date --iso-8601).img.qcow2
+IMAGE_SIZE=10G
+NBD_DEVICE=/dev/nbd1
+
+# TODO: find the package definition and built ourself, publish in some RPM repository.
+ONE_CONTEXT_RPM_URL="https://github.com/OpenNebula/addon-context-linux/releases/download/v5.10.0/one-context-5.10.0-1.el8.noarch.rpm"
+ONE_CONTEXT_RPM_PATH=/root/one-context.rpm
+
+cleanup() {
+	# The order here is important.
+	umount /mnt/dev/pts 2>/dev/null || true
+	umount /mnt/dev/shm 2>/dev/null || true
+	umount /mnt/dev 2>/dev/null || true
+	umount /mnt/proc 2>/dev/null || true
+	umount /mnt/run 2>/dev/null || true
+	umount /mnt/sys 2>/dev/null || true
+	umount /mnt/boot 2>/dev/null || true
+	umount /mnt 2>/dev/null || true
+	qemu-nbd --disconnect "$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 [ ! -f '/etc/fedora-release' ]; then
+	echo "WARNING: this script has been designed to run on a Fedora system." >&2
+	echo "WARNING: Not running Fedora. 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"
+
+# Don't forget to cleanup, even if the script crash.
+trap cleanup EXIT
+
+# Create partition table, format partitions.
+sfdisk --no-reread "$NBD_DEVICE" <<EOF
+1M,100M,L,*
+,,L
+EOF
+
+mkfs.ext4 "${NBD_DEVICE}p1"
+mkfs.ext4 "${NBD_DEVICE}p2"
+
+# Mount partitions, install base OS.
+# Note: we could use the @Core package group but it pulls quite a lot of
+# 'unwanted' dependencies. Run `dnf group info Core` for details.
+
+mount "${NBD_DEVICE}p2" /mnt
+mkdir /mnt/boot
+mount "${NBD_DEVICE}p1" /mnt/boot
+
+# XXX: dnf has a lot a weird (libX11?) dependencies, use microdnf instead?
+
+dnf -y \
+	--releasever=$RELEASE \
+	--installroot=/mnt \
+	--disablerepo='*' \
+	--enablerepo=fedora \
+	--enablerepo=updates install \
+	basesystem systemd systemd-udev passwd dnf fedora-release
+
+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.
+# Note: as of writing, one-context does not support NetworkManager or
+# systemd-networkd.
+
+# Required to resolve package mirror in chroot.
+# TODO: use non-$BIGCORP DNS service.
+echo 'nameserver 1.1.1.1' >> /mnt/etc/resolv.conf
+
+# See https://github.com/OpenNebula/addon-context-linux/issues/121 for details.
+# network-scripts.x86_64 : Legacy scripts for manipulating of network devices
+run_root dnf -y install network-scripts
+
+# Install (magic?) one-context RPM and hope things works as expected.
+curl -L "$ONE_CONTEXT_RPM_URL" > "/mnt$ONE_CONTEXT_RPM_PATH"
+run_root dnf -y install "$ONE_CONTEXT_RPM_PATH"
+run_root rm "$ONE_CONTEXT_RPM_PATH"
+
+# Initalize base services.
+run_root systemd-machine-id-setup
+run_root systemctl enable systemd-networkd.service
+
+run_root ln -sf /usr/share/zoneinfo/UTC /etc/localtime
+run_root systemctl enable systemd-timesyncd.service
+
+# Install kernel and bootloader.
+run_root dnf -y install kernel grub2
+run_root grub2-install --target=i386-pc "${NBD_DEVICE}"
+run_root grub2-mkconfig -o /boot/grub2/grub.cfg
+
+# Install en configure SSH daemon.
+run_root dnf -y install openssh-server
+run_root systemctl enable sshd
+
+# Generate fstab file.
+# TODO: use UIDs instead of /dev/vdaX, current scheme is very fragile.
+cat >>/mnt/etc/fstab <<EOF
+/dev/sda1 /boot ext4 rw,relatime,data=ordered 0 2
+/dev/sda2 /     ext4 rw,relatime,data=ordered 0 1
+EOF
+
+# Make sure everything is written to disk before exiting.
+sync