From 4fbd39ea1e4f3b9f73cadadd60e4427dae40ac83 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B8rn=20=C3=85ne=20de=20Jong?= <git@jornane.no>
Date: Sun, 1 May 2022 13:04:27 +0200
Subject: [PATCH] Add FreeBSD on ZFS install script

---
 .../freebsd-zfs-build-opennebula-image.sh     | 140 ++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 opennebula-images/freebsd-zfs-build-opennebula-image.sh

diff --git a/opennebula-images/freebsd-zfs-build-opennebula-image.sh b/opennebula-images/freebsd-zfs-build-opennebula-image.sh
new file mode 100644
index 0000000..a58edac
--- /dev/null
+++ b/opennebula-images/freebsd-zfs-build-opennebula-image.sh
@@ -0,0 +1,140 @@
+#!/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.
+# ZFS installation as documented by the FreeBSD project
+# https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot
+
+set -e
+set -x
+
+# XXX: Handle command-line arguments?
+RELEASE=13.0-RELEASE
+ARCH=amd64
+IMAGE_PATH=freebsd-$RELEASE-$(date -I).img.qcow2
+IMAGE_SIZE=10G
+
+DIST_BASE="https://download.freebsd.org/ftp/releases/$ARCH/$RELEASE"
+ZPOOL=zroot
+
+ONE_CONTEXT_PKG_URL="https://github.com/OpenNebula/addon-context-linux/releases/download/v6.2.0/one-context-6.2.0_1.txz"
+
+if [ "$(zpool list -Ho name $ZPOOL)" = $ZPOOL ]; then
+	echo "The pool $ZPOOL is already imported." >&2
+	exit 1
+fi
+
+cleanup() {
+	sync || true
+	umount /mnt/dev || true
+	zpool export $ZPOOL || true
+	mdconfig -du md0 || true
+}
+trap cleanup EXIT
+
+if [ "$(whoami)" != 'root' ]; then
+	echo "This script must be run as root." >&2
+	exit 1
+fi
+
+# Allocate and partition/format disk image.
+# We use "legacy boot", aka BIOS boot
+# Preferably, we'd use EFI boot here, check the FreeBSD wiki link in the header
+# to see how to make that change, but make the EFI partition larger
+disk=$(mktemp)
+truncate -s 6G $disk
+mdconfig -a -t vnode -f $disk -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/gptzfsboot -i 1 md0
+gpart add -t freebsd-zfs -l zfs0 -b 1M -s 5G md0
+zpool create -O compression=on -o ashift=12 -o altroot=/mnt -m none $ZPOOL md0p2
+
+zfs create -o mountpoint=none                                  $ZPOOL/ROOT
+zfs create -o mountpoint=/ -o canmount=noauto                  $ZPOOL/ROOT/default
+mount -t zfs $ZPOOL/ROOT/default /mnt
+zpool set bootfs=$ZPOOL/ROOT/default $ZPOOL
+
+zfs create -o mountpoint=/tmp  -o exec=on      -o setuid=off   $ZPOOL/tmp
+zfs create -o canmount=off -o mountpoint=/usr                  $ZPOOL/usr
+zfs create                                                     $ZPOOL/usr/home
+zfs create                     -o exec=off     -o setuid=off   $ZPOOL/usr/src
+zfs create                                                     $ZPOOL/usr/obj
+zfs create -o mountpoint=/usr/ports            -o setuid=off   $ZPOOL/usr/ports
+zfs create                     -o exec=off     -o setuid=off   $ZPOOL/usr/ports/distfiles
+zfs create                     -o exec=off     -o setuid=off   $ZPOOL/usr/ports/packages
+zfs create -o canmount=off -o mountpoint=/var                  $ZPOOL/var
+zfs create                     -o exec=off     -o setuid=off   $ZPOOL/var/audit
+zfs create                     -o exec=off     -o setuid=off   $ZPOOL/var/crash
+zfs create                     -o exec=off     -o setuid=off   $ZPOOL/var/log
+zfs create -o atime=on         -o exec=off     -o setuid=off   $ZPOOL/var/mail
+zfs create                     -o exec=on      -o setuid=off   $ZPOOL/var/tmp
+
+ln -s /usr/home /mnt/home
+chmod 1777 /mnt/var/tmp
+chmod 1777 /mnt/tmp
+
+# Mount allocated image.
+mkdir -p /mnt/dev
+mount -t devfs devfs /mnt/dev
+
+# Download and extract base system.
+dist_files="kernel.txz base.txz"
+dist_dir="/usr/freebsd-dist/$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/$f"
+done
+
+# Configure new system.
+printf '# Device\tMountpoint\tFStype\tOptions\tDump\tPass#\n' >/mnt/etc/fstab
+touch /mnt/firstboot
+sysrc -f /mnt/boot/loader.conf zfs_load=YES autoboot_delay=-1
+
+sysrc -f /mnt/etc/rc.conf ntpd_enable=YES sshd_enable=YES growfs_enable=YES hostname=freebsd
+
+cp /etc/resolv.conf /mnt/etc/resolv.conf
+tzsetup -s -C /mnt UTC
+
+cat >>/mnt/etc/ssh/sshd_config <<EOF
+PermitRootLogin yes
+PasswordAuthentication no
+PermitEmptyPasswords no
+EOF
+
+mkdir -p /mnt/usr/local/etc/pkg/repos/
+# It doesn't appear to be necessary to use "latest", "quarterly" is new enough
+#sed -es@quarterly@latest@ </mnt/etc/pkg/FreeBSD.conf >/mnt/usr/local/etc/pkg/repos/FreeBSD.conf
+
+# freebsd-update is only supported for RELEASE
+if [ "${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
+
+fetch -m -o /mnt/one-context.txz "$ONE_CONTEXT_PKG_URL"
+# OpenNebula has dependencies, but these are not included in the package for some reason
+# https://github.com/OpenNebula/addon-context-linux/blob/40efc929487b2955e6f32643853a5cdc93c548da/targets.sh#L25
+# It would be useful to see if there is an alternative to OpenNebula without so many dependencies,
+# so we can run on FreeBSD base, and avoid breaking OpenNebula when the admin removes a dependency.
+env ASSUME_ALWAYS_YES=YES pkg -c /mnt install sudo bash curl base64 ruby open-vm-tools-nox11 gawk virt-what one-context.txz
+rm /mnt/one-context.txz
+
+cleanup
+trap : EXIT
+
+mkdir -p "$ARCH"
+qemu-img convert -f raw -O qcow2 "$disk" "$IMAGE_PATH"
+rm "$disk"
+
+# Filesystem will be enlarged by growfs(7) on next startup
+qemu-img resize "$IMAGE_PATH" "$IMAGE_SIZE"