Thales Maciel
14d8563f3c
Avoid the Alpine boot stall caused by kernel ip= autoconfig running before virtio_net is available. Split runtime and image-build boot args so managed VMs boot without kernel network autoconfig, inject a static guest network config plus bootstrap script into the runtime overlay, and keep image builds on the old path for compatibility with existing base images. Preserve executable bits when patching guest files into ext4 images and add coverage for the new boot-arg split and guest network config generation. Validated with go test ./..., a rebuilt Alpine image, and a fresh alp-fast create/ssh check that brought vm.start down to about 2.7s.
163 lines
2.9 KiB
Bash
163 lines
2.9 KiB
Bash
#!/bin/sh
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set -eu
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PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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CONFIG_PATH="/etc/banger-network.conf"
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if ! command -v ip >/dev/null 2>&1; then
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exit 0
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fi
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guest_ip=""
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gateway_ip=""
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netmask=""
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iface_hint=""
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dns1=""
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dns2=""
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load_file_config() {
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if [ ! -r "$CONFIG_PATH" ]; then
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return 1
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fi
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# shellcheck disable=SC1090
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. "$CONFIG_PATH"
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guest_ip="${GUEST_IP:-}"
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gateway_ip="${GATEWAY_IP:-}"
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netmask="${NETMASK:-}"
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iface_hint="${INTERFACE:-}"
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dns1="${DNS1:-}"
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dns2="${DNS2:-}"
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[ -n "$guest_ip" ]
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}
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load_cmdline_config() {
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cmdline="$(cat /proc/cmdline 2>/dev/null || true)"
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ip_arg=""
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for arg in $cmdline; do
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case "$arg" in
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ip=*)
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ip_arg="${arg#ip=}"
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break
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;;
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esac
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done
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if [ -z "$ip_arg" ]; then
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return 1
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fi
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guest_ip="$(field 1)"
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gateway_ip="$(field 3)"
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netmask="$(field 4)"
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iface_hint="$(field 6)"
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dns1="$(field 8)"
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dns2="$(field 9)"
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[ -n "$guest_ip" ]
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}
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field() {
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printf '%s' "$ip_arg" | cut -d: -f"$1"
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}
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mask_to_prefix() {
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case "$1" in
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[0-9]|[1-2][0-9]|3[0-2])
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printf '%s\n' "$1"
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return 0
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;;
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esac
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prefix=0
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old_ifs=$IFS
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IFS=.
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set -- $1
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IFS=$old_ifs
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if [ "$#" -ne 4 ]; then
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return 1
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fi
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for octet in "$@"; do
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case "$octet" in
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255) prefix=$((prefix + 8)) ;;
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254) prefix=$((prefix + 7)) ;;
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252) prefix=$((prefix + 6)) ;;
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248) prefix=$((prefix + 5)) ;;
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240) prefix=$((prefix + 4)) ;;
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224) prefix=$((prefix + 3)) ;;
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192) prefix=$((prefix + 2)) ;;
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128) prefix=$((prefix + 1)) ;;
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0) ;;
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*) return 1 ;;
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esac
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done
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printf '%s\n' "$prefix"
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}
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find_iface() {
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hint="$1"
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if [ -n "$hint" ] && [ -d "/sys/class/net/$hint" ]; then
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printf '%s\n' "$hint"
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return 0
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fi
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for path in /sys/class/net/*; do
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[ -e "$path" ] || continue
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iface="${path##*/}"
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if [ "$iface" = "lo" ]; then
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continue
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fi
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printf '%s\n' "$iface"
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return 0
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done
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return 1
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}
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if ! load_file_config; then
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load_cmdline_config || exit 0
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fi
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if [ -z "$guest_ip" ]; then
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exit 0
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fi
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iface=""
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attempt=0
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while [ "$attempt" -lt 50 ]; do
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iface="$(find_iface "$iface_hint" || true)"
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if [ -n "$iface" ]; then
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break
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fi
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attempt=$((attempt + 1))
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sleep 0.2
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done
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if [ -z "$iface" ]; then
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exit 0
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fi
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prefix="$(mask_to_prefix "$netmask" || printf '24\n')"
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ip link set "$iface" up
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ip addr replace "$guest_ip/$prefix" dev "$iface"
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if [ -n "$gateway_ip" ]; then
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ip route replace default via "$gateway_ip" dev "$iface"
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fi
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if [ -n "$dns1" ] || [ -n "$dns2" ]; then
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tmp_resolv="/tmp/.banger-resolv.conf.$$"
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: > "$tmp_resolv"
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if [ -n "$dns1" ]; then
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printf 'nameserver %s\n' "$dns1" >> "$tmp_resolv"
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fi
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if [ -n "$dns2" ]; then
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printf 'nameserver %s\n' "$dns2" >> "$tmp_resolv"
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fi
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if [ -s "$tmp_resolv" ]; then
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cat "$tmp_resolv" > /etc/resolv.conf
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fi
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rm -f "$tmp_resolv"
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fi
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