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#!/bin/bash
# build-host.sh runs build-inside-vm.sh in a qemu VM running the latest Arch installer iso
#
# nounset: "Treat unset variables and parameters [...] as an error when performing parameter expansion."
# errexit: "Exit immediately if [...] command exits with a non-zero status."
set -o nounset -o errexit
readonly MIRROR="https://mirror.pkgbuild.com"
function init() {
readonly ORIG_PWD="${PWD}"
readonly OUTPUT="${PWD}/output"
readonly TMPDIR="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
mkdir -p "${OUTPUT}" "${TMPDIR}"
cd "${TMPDIR}"
}
# Do some cleanup when the script exits
function cleanup() {
rm -rf "${TMPDIR}"
jobs -p | xargs --no-run-if-empty kill
}
trap cleanup EXIT
# Use local Arch iso or download the latest iso and extract the relevant files
function prepare_boot() {
if LOCAL_ISO="$(ls "${ORIG_PWD}/"archlinux-*-x86_64.iso 2>/dev/null)"; then
echo "Using local iso: ${LOCAL_ISO}"
ISO="${LOCAL_ISO}"
fi
if [ -z "${LOCAL_ISO}" ]; then
LATEST_ISO="$(curl -fs "${MIRROR}/iso/latest/" | grep -Eo 'archlinux-[0-9]{4}\.[0-9]{2}\.[0-9]{2}-x86_64.iso' | head -n 1)"
if [ -z "${LATEST_ISO}" ]; then
echo "Error: Couldn't find latest iso'"
exit 1
fi
curl -fO "${MIRROR}/iso/latest/${LATEST_ISO}"
ISO="${PWD}/${LATEST_ISO}"
fi
# We need to extract the kernel and initrd so we can set a custom cmdline:
# console=ttyS0, so the kernel and systemd sends output to the serial.
xorriso -osirrox on -indev "${ISO}" -extract arch/boot/x86_64 .
ISO_VOLUME_ID="$(xorriso -indev "${ISO}" |& awk -F : '$1 ~ "Volume id" {print $2}' | tr -d "' ")"
}
function start_qemu() {
# Used to communicate with qemu
mkfifo guest.out guest.in
# We could use a sparse file but we want to fail early
fallocate -l 8G scratch-disk.img
{ qemu-system-x86_64 \
-machine accel=kvm:tcg \
-smp "$(nproc)" \
-m 4096 \
-net nic \
-net user \
-kernel vmlinuz-linux \
-initrd initramfs-linux.img \
-append "archisobasedir=arch archisolabel=${ISO_VOLUME_ID} ip=dhcp net.ifnames=0 console=ttyS0 mirror=${MIRROR}" \
-drive file=scratch-disk.img,format=raw,if=virtio \
-drive file="${ISO}",format=raw,if=virtio,media=cdrom,read-only \
-virtfs "local,path=${ORIG_PWD},mount_tag=host,security_model=none" \
-monitor none \
-serial pipe:guest \
-nographic || kill "${$}"; } &
# We want to send the output to both stdout (fd1) and fd10 (used by the expect function)
exec 3>&1 10< <(tee /dev/fd/3 <guest.out)
}
# Wait for a specific string from qemu
function expect() {
local length="${#1}"
local i=0
local timeout="${2:-30}"
# We can't use ex: grep as we could end blocking forever, if the string isn't followed by a newline
while true; do
# read should never exit with a non-zero exit code,
# but it can happen if the fd is EOF or it times out
IFS= read -r -u 10 -n 1 -t "${timeout}" c
if [ "${1:${i}:1}" = "${c}" ]; then
i="$((i + 1))"
if [ "${length}" -eq "${i}" ]; then
break
fi
else
i=0
fi
done
}
# Send string to qemu
function send() {
echo -en "${1}" >guest.in
}
function main() {
init
prepare_boot
start_qemu
# Login
expect "archiso login:"
send "root\n"
expect "# "
# Switch to bash and shutdown on error
send "bash\n"
expect "# "
send "trap \"shutdown now\" ERR\n"
expect "# "
# Prepare environment
send "mkdir /mnt/project && mount -t 9p -o trans=virtio host /mnt/project -oversion=9p2000.L\n"
expect "# "
send "mkfs.ext4 /dev/vda && mkdir /mnt/scratch-disk/ && mount /dev/vda /mnt/scratch-disk && cd /mnt/scratch-disk\n"
expect "# "
send "cp -a /mnt/project/{.gitlab,archiso,configs,scripts} .\n"
expect "# "
send "mkdir pkg && mount --bind pkg /var/cache/pacman/pkg\n"
expect "# "
# Wait for pacman-init
send "until systemctl is-active pacman-init; do sleep 1; done\n"
expect "# "
# Explicitly lookup mirror address as we'd get random failures otherwise during pacman
send "curl -sSo /dev/null ${MIRROR}\n"
expect "# "
# Install required packages
send "pacman -Sy --noconfirm qemu-headless jq dosfstools e2fsprogs libisoburn mtools squashfs-tools\n"
expect "# "
## Start build and copy output to local disk
send "bash -x ./.gitlab/ci/build-inside-vm.sh ${PROFILE}\n "
expect "# " 1000 # mksquashfs can take a long time
send "cp -r --preserve=mode,timestamps output /mnt/project/tmp/$(basename "${TMPDIR}")/\n"
expect "# " 60
mv output/* "${OUTPUT}/"
# Shutdown the VM
send "shutdown now\n"
wait
}
main
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