Initial uncloud Debian image definition
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debian-uncloud-image.sh
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debian-uncloud-image.sh
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#!/bin/sh
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# This script generates Debian images for Uncloud.
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#
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# Test image locally (without network) with:
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# qemu-system-x86_64 -enable-kvm -m 1G -drive file=$IMAGE,format=qcow2
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set -e
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set -x
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# XXX: Handle command-line arguments?
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RELEASE=buster # 10
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ARCH=amd64
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IMAGE_PATH=debian-uncloud-$RELEASE-$(date --iso-8601).img.qcow2
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IMAGE_SIZE=10G
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NBD_DEVICE=/dev/nbd0
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APT_MIRROR=http://deb.debian.org/debian
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cleanup() {
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# The order here is important.
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umount /mnt/dev/pts 2>/dev/null || true
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umount /mnt/dev/shm 2>/dev/null || true
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umount /mnt/dev 2>/dev/null || true
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umount /mnt/proc 2>/dev/null || true
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umount /mnt/run 2>/dev/null || true
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umount /mnt/sys 2>/dev/null || true
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umount /mnt/boot 2>/dev/null || true
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umount /mnt 2>/dev/null || true
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qemu-nbd --disconnect "$NBD_DEVICE" || true
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}
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run_root() {
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chroot /mnt /usr/bin/env \
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PATH=/sbin:/usr/sbin:/bin:/usr/bin \
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sh -c "$*"
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}
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if [ "$(whoami)" != 'root' ]; then
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echo "This script must be run as root." >&2
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exit 1
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fi
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if [ $(lsb_release --short --id) != "Debian" ]; then
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echo "WARNING: this script has been designed to run on a Debian system." >&2
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echo "WARNING: Not running Debian. Giving you 5 seconds to abort." >&2
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sleep 5
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fi
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# Create base QCOW2 image.
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qemu-img create -f qcow2 "$IMAGE_PATH" "$IMAGE_SIZE"
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modprobe nbd max_part=16
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qemu-nbd --connect="$NBD_DEVICE" "$IMAGE_PATH"
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# Wait for qemu-nbd to settle.
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sleep 1
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# Don't forget to cleanup, even if the script crash.
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trap cleanup EXIT
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# Create partition table, format partitions.
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sfdisk --no-reread "$NBD_DEVICE" <<EOF
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1M,500M,L,*
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,,L
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EOF
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mkfs.ext4 "${NBD_DEVICE}p1"
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mkfs.ext4 "${NBD_DEVICE}p2"
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# Mount partitions, install base OS.
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mount "${NBD_DEVICE}p2" /mnt
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mkdir /mnt/boot
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mount "${NBD_DEVICE}p1" /mnt/boot
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debootstrap \
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--arch=$ARCH $RELEASE \
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/mnt $APT_MIRROR
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mount --bind /dev /mnt/dev
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mount --bind /dev/pts /mnt/dev/pts
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mount --bind /dev/shm /mnt/dev/shm
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mount --bind /proc /mnt/proc
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mount --bind /run /mnt/run
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mount --bind /sys /mnt/sys
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# Required to resolve package mirror in chroot.
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cp /etc/resolv.conf /mnt/etc/resolv.conf
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# Initialize /etc/hosts.
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cat > /mnt/etc/hosts << EOF
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127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
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::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
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EOF
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# Configure package sources and update package index.
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cat >/mnt/etc/apt/sources.list <<EOF
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deb $APT_MIRROR $RELEASE main
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deb-src $APT_MIRROR $RELEASE main
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deb $APT_MIRROR $RELEASE-updates main
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deb-src $APT_MIRROR $RELEASE-updates main
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deb http://security.debian.org/debian-security $RELEASE/updates main
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deb-src http://security.debian.org/debian-security $RELEASE/updates main
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EOF
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run_root apt-get update
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# Install RDNSSD for DNS discovery from router advertisement. The service is enabled by default.
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run_root apt-get install rdnssd
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# Initialize base services.
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run_root systemd-machine-id-setup
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run_root ln -sf /usr/share/zoneinfo/UTC /etc/localtime
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run_root systemctl enable systemd-timesyncd.service
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# Install kernel and bootloader. Do not autoconfigure grub.
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run_root echo "grub-pc grub-pc/install_devices_empty boolean true" | debconf-set-selections
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run_root DEBIAN_FRONTEND=noninteractive apt-get -y install locales linux-base linux-image-generic grub-pc
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# Configure grub.
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run_root grub-install --target=i386-pc "${NBD_DEVICE}"
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run_root grub-mkconfig -o /boot/grub/grub.cfg
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# Install en configure SSH daemon. The service is enabled by default.
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run_root apt-get -y install openssh-server
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# Generate fstab file.
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boot_uuid=$(blkid --match-tag UUID --output value "${NBD_DEVICE}p1")
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root_uuid=$(blkid --match-tag UUID --output value "${NBD_DEVICE}p2")
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cat >>/mnt/etc/fstab <<EOF
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UUID=$boot_uuid /boot ext4 rw,relatime,data=ordered 0 2
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UUID=$root_uuid / ext4 rw,relatime,data=ordered 0 1
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EOF
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# Reset systemd's environment.
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run_root rm -f /etc/machine-id
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run_root touch /etc/machine-id
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rm -f /var/lib/systemd/random-seed
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# Remove temporary files and reclaim freed disk space.
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run_root apt-get clean
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# Make sure everything is written to disk before exiting.
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sync
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