Add initial alpine image definition
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169
alpine-uncloud-image.sh
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169
alpine-uncloud-image.sh
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#!/bin/sh
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# This script generates Alpine 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=$IMAGE,format=qcow2
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set -e
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set -x
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# XXX: Handle command-line arguments?
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RELEASE=v3.11
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ARCH=x86_64
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IMAGE_PATH=alpine-uncloud-$RELEASE-$(date -I).img.qcow2
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IMAGE_SIZE=10G
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NBD_DEVICE=/dev/nbd1
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APK_MIRROR=http://dl-2.alpinelinux.org/alpine/ # Mind the trailing /
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cleanup() {
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# The order here is important.
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umount /mnt/dev/pts 2>/dev/null || true
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umount /mnt/dev/shm 2>/dev/null || true
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umount /mnt/dev 2>/dev/null || true
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umount /mnt/proc 2>/dev/null || true
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umount /mnt/run 2>/dev/null || true
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umount /mnt/sys 2>/dev/null || true
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umount /mnt/boot 2>/dev/null || true
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umount /mnt 2>/dev/null || true
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qemu-nbd --disconnect "$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 [ $(lsb_release --short --id) != "Alpine" ]; then
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echo "WARNING: this script has been designed to run on an Alpine system." >&2
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echo "WARNING: Not running Alpine. Giving you 5 seconds to abort." >&2
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sleep 5
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fi
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# Create base QCOW2 image.
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qemu-img create -f qcow2 "$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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# TODO: Remove bash
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apk add -U -X $APK_MIRROR$RELEASE/main/ \
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--allow-untrusted \
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--arch="$ARCH" \
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--root=/mnt \
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--initdb \
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alpine-base alpine-conf openssh sudo syslinux tzdata gnupg bash
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mount --bind /dev /mnt/dev
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mount --bind /dev/pts /mnt/dev/pts
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mount --bind /dev/shm /mnt/dev/shm
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mount --bind /proc /mnt/proc
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mount --bind /run /mnt/run
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mount --bind /sys /mnt/sys
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# Required to resolve package mirror in chroot.
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cp /etc/resolv.conf /mnt/etc/resolv.conf
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# Initialize /etc/hosts.
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cat > /mnt/etc/hosts << EOF
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127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
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::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
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EOF
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# Accept router advertisements for SLAAC.
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run_root sysctl -w net.ipv6.conf.all.accept_ra=1
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# Configure package sources and update package index.
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run_root setup-timezone -z UTC
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if [ "$RELEASE" = "edge" ]
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then
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cat >/mnt/etc/apk/repositories <<EOF
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$APK_MIRROR$RELEASE/main
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$APK_MIRROR$RELEASE/community
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$APK_MIRROR$RELEASE/testing
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EOF
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else
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cat >/mnt/etc/apk/repositories <<EOF
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$APK_MIRROR$RELEASE/main
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$APK_MIRROR$RELEASE/community
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EOF
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fi
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# Update package index.
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run_root apk update
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# Install RDNSSD for DNS discovery from router advertisement.
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run_root apk add ndisc6
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# Initialize base services.
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for i in ntpd sshd crond rdnssd; do
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run_root rc-update add $i default
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done
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for i in hwclock modules sysctl hostname bootmisc networking syslog swap urandom; do
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run_root rc-update add $i boot
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done
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for i in mount-ro killprocs savecache; do
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run_root rc-update add $i shutdown
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done
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# Set hostname.
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run_root setup-hostname -n alpine
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# Install kernel and bootloader.
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dd if=/usr/share/syslinux/mbr.bin of=/dev/nbd0 bs=1 count=440
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extlinux -i /mnt/boot
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cat >/mnt/boot/extlinux.conf <<EOF
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DEFAULT linux
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LABEL linux
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LINUX vmlinuz-$(echo "$linux" | cut -d- -f2-)
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INITRD initramfs-$(echo "$linux" | cut -d- -f2-)
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APPEND root=/dev/vda3 rw modules=sd-mod,usb-storage,ext4 quiet rootfstype=ext4
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EOF
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run_root apk add linux-virt
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# Generate fstab file.
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boot_uuid=$(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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# FIXME: add fnux's SSH key for testing purposes.
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mkdir -p /mnt/root/.ssh
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curl https://key.wf/fnux > /mnt/root/.ssh/authorized_keys
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# Make sure everything is written to disk before exiting.
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sync
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