实现首版 Gitea microVM runner

2026-09-16 13:06:05 +00:00
parent 0ee1d50703
commit 23695fcc98
14 changed files with 580 additions and 2 deletions
@@ -0,0 +1,37 @@
+#!/bin/sh
+set -eu
+
+action=${1:?up or down is required}
+bridge=${RUNNER_BRIDGE:-mvrbr0}
+subnet=${RUNNER_SUBNET:-172.30.0.0/24}
+gateway=${RUNNER_GATEWAY:-172.30.0.1}
+dhcp_start=${RUNNER_DHCP_START:-172.30.0.10}
+dhcp_end=${RUNNER_DHCP_END:-172.30.0.200}
+pid_file=${RUNNER_DNSMASQ_PID:-/run/microvm-runner/dnsmasq.pid}
+
+case "$action" in
+up)
+    mkdir -p "$(dirname "$pid_file")"
+    ip link show "$bridge" >/dev/null 2>&1 || ip link add "$bridge" type bridge
+    ip address show dev "$bridge" | grep -Fq "$gateway/24" || ip address add "$gateway/24" dev "$bridge"
+    ip link set "$bridge" up
+    sysctl -q -w net.ipv4.ip_forward=1
+    iptables -t nat -C POSTROUTING -s "$subnet" -j MASQUERADE 2>/dev/null || \
+        iptables -t nat -A POSTROUTING -s "$subnet" -j MASQUERADE
+    dnsmasq --interface="$bridge" --bind-interfaces --except-interface=lo \
+        --dhcp-range="$dhcp_start,$dhcp_end,255.255.255.0,1h" \
+        --dhcp-option="option:router,$gateway" --pid-file="$pid_file"
+    ;;
+down)
+    if test -r "$pid_file"; then
+        kill "$(cat "$pid_file")" 2>/dev/null || true
+        rm -f -- "$pid_file"
+    fi
+    iptables -t nat -D POSTROUTING -s "$subnet" -j MASQUERADE 2>/dev/null || true
+    ip link delete "$bridge" 2>/dev/null || true
+    ;;
+*)
+    echo "expected up or down" >&2
+    exit 64
+    ;;
+esac