Initial sourcehut-inspired freebsd image build script

opennebula-images/freebsd-build-opennebula-image.sh

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+#!/bin/sh
+
+# This script generates FreeBSD images for OpenNebula, being heavily inspired
+# from srht's FreeBSD build image definition. It assumes running on a FreeBSD host.
+
+set -e
+set -x
+
+# XXX: Handle command-line arguments?
+RELEASE=12.1-RELEASE
+IMAGE_PATH=freebsd-$RELEASE-$(date +%+F).img.qcow2
+IMAGE_SIZE=10G
+
+# 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() {
+	sync || true
+	umount /mnt/dev || true
+	umount /mnt || true
+	mdconfig -du md0 || true
+}
+trap cleanup EXIT
+
+if [ "$(whoami)" != 'root' ]; then
+	echo "This script must be run as root." >&2
+	exit 1
+fi
+
+# Allocate and partition/format disk image.
+truncate -s 6G disk.img
+mdconfig -a -t vnode -f disk.img -u md0
+gpart create -s gpt /dev/md0
+gpart add -t freebsd-boot -l bootfs -b 40 -s 512K md0
+gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 md0
+gpart add -t freebsd-ufs -l rootfs -b 1M -s 5G md0
+newfs -U /dev/md0p2
+
+# Mount allocated image.
+mount /dev/md0p2 /mnt
+mkdir -p /mnt/dev
+mount -t devfs devfs /mnt/dev
+
+# Download and extract base system.
+dist_files="kernel.txz base.txz"
+dist_dir="/usr/freebsd-dist/$arch/$release"
+
+mkdir -p "$dist_dir"
+for f in $dist_files
+do
+	fetch -m -o "$dist_dir/$f" "$dist_base/$f"
+	tar -C /mnt -xJf "$dist_dir/$f"
+done
+
+# Configure new system.
+echo "/dev/gpt/rootfs / ufs rw,noatime 1 1" >/mnt/etc/fstab
+touch /mnt/firstboot
+echo 'autoboot_delay="-1"' >>/mnt/boot/loader.conf
+
+cat >>/mnt/etc/rc.conf <<EOF
+ntpd_enable=YES
+sshd_enable=YES
+growfs_enable=YES
+hostname="freebsd"
+EOF
+
+cp /etc/resolv.conf > /mnt/etc/resolv.conf
+tzsetup -s -C /mnt UTC
+
+cat >>/mnt/etc/ssh/sshd_config <<EOF
+PermitRootLogin yes
+PasswordAuthentication no
+PermitEmptyPasswords no
+EOF
+
+mkdir -p /mnt/usr/local/etc/pkg/repos/
+cat >/mnt/usr/local/etc/pkg/repos/FreeBSD.conf <<EOF
+FreeBSD: {
+	url: pkg+http://pkg.FreeBSD.org/\$\{ABI\}/latest
+	enabled: yes
+}
+EOF
+
+# freebsd-update is only supported for RELEASE
+if [ "${release%-RELEASE}" != "$release" ]
+then
+	env PAGER=true /usr/sbin/freebsd-update \
+		-b /mnt \
+		--currently-running "$release" \
+		--not-running-from-cron -F \
+		fetch install
+fi
+
+env ASSUME_ALWAYS_YES=YES pkg -c /mnt bootstrap -f
+env ASSUME_ALWAYS_YES=YES pkg -c /mnt install bash
+
+fetch -m -o "$dist_dir/ports.txz" "$ports_base/ports.txz"
+tar -C /mnt -xJf "$dist_dir/ports.txz"
+
+cleanup
+trap : EXIT
+
+mkdir -p "$arch"
+qemu-img convert -f raw -O qcow2 disk.img "$arch"/root.img.qcow2
+rm disk.img
+
+# Filesystem will be enlarged by growfs(7) on next startup
+qemu-img resize $IMAGE_PATH $IMAGE_SIZE