From 0f658612703d65d75b8dcb474ccfe0409d1cbe78 Mon Sep 17 00:00:00 2001
From: spiritLHLS <103393591+spiritLHLS@users.noreply.github.com>
Date: Sun, 23 Apr 2023 22:29:54 +0800
Subject: [PATCH] Update build_nat_network.sh

---
 scripts/build_nat_network.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/scripts/build_nat_network.sh b/scripts/build_nat_network.sh
index 19c8c6f..6046555 100644
--- a/scripts/build_nat_network.sh
+++ b/scripts/build_nat_network.sh
@@ -69,6 +69,30 @@ else
 fi
 ${sysctl_path} -p
 
+# 检查/etc/network/interfaces是否有source /etc/network/interfaces.d/*行
+if grep -q "source /etc/network/interfaces.d/*" /etc/network/interfaces; then
+  # 检查/etc/network/interfaces.d/文件夹下是否有50-cloud-init文件
+  if [ -f /etc/network/interfaces.d/50-cloud-init ]; then
+    # 检查50-cloud-init文件中是否有iface eth0 inet dhcp行
+    if grep -q "iface eth0 inet dhcp" /etc/network/interfaces.d/50-cloud-init; then
+      # 获取ipv4、subnet、gateway信息
+      gateway=$(ip route | awk '/default/ {print $3}')
+      eth0info=$(ip -o -4 addr show dev eth0 | awk '{print $4}')
+      ipv4=$(echo $eth0info | cut -d'/' -f1)
+      subnet=$(echo $eth0info | cut -d'/' -f2)
+      subnet=$(ipcalc -n "$ipv4/$subnet" | grep -oP 'Netmask:\s+\K.*' | awk '{print $1}')
+      chattr -i /etc/network/interfaces.d/50-cloud-init
+      sed -i "/iface eth0 inet dhcp/c\
+        iface eth0 inet static\n\
+        address $ipv4\n\
+        netmask $subnet\n\
+        gateway $gateway\n\
+        dns-nameservers 8.8.8.8 8.8.4.4" /etc/network/interfaces.d/50-cloud-init
+      chattr +i /etc/network/interfaces.d/50-cloud-init
+    fi
+  fi
+fi
+
 # 重启配置
 service networking restart
 systemctl restart networking.service