#!/bin/sh
set -eu

PATH=/usr/sbin:/usr/bin:/sbin:/bin
AGENT=/opt/pyro/bin/pyro_guest_agent.py

mount -t proc proc /proc || true
mount -t sysfs sysfs /sys || true
mount -t devtmpfs devtmpfs /dev || true
mkdir -p /dev/pts /run /tmp
mount -t devpts devpts /dev/pts -o mode=620,ptmxmode=666 || true
hostname pyro-vm || true

cmdline="$(cat /proc/cmdline 2>/dev/null || true)"

get_arg() {
    key="$1"
    for token in $cmdline; do
        case "$token" in
            "$key"=*)
                printf '%s' "${token#*=}"
                return 0
                ;;
        esac
    done
    return 1
}

ip link set lo up || true
if ip link show eth0 >/dev/null 2>&1; then
    ip link set eth0 up || true
    guest_ip="$(get_arg pyro.guest_ip || true)"
    gateway_ip="$(get_arg pyro.gateway_ip || true)"
    netmask="$(get_arg pyro.netmask || true)"
    dns_csv="$(get_arg pyro.dns || true)"
    if [ -n "$guest_ip" ] && [ -n "$netmask" ]; then
        ip addr add "$guest_ip/$netmask" dev eth0 || true
    fi
    if [ -n "$gateway_ip" ]; then
        ip route add default via "$gateway_ip" dev eth0 || true
    fi
    if [ -n "$dns_csv" ]; then
        : > /etc/resolv.conf
        old_ifs="$IFS"
        IFS=,
        for dns in $dns_csv; do
            printf 'nameserver %s\n' "$dns" >> /etc/resolv.conf
        done
        IFS="$old_ifs"
    fi
fi

if [ -f "$AGENT" ]; then
    python3 "$AGENT" &
fi

exec /bin/sh -lc 'trap : TERM INT; while true; do sleep 3600; done'