30ignition: remove initramfs networking

dracut/30ignition/coreos-teardown-initramfs-network.service

@@ -0,0 +1,20 @@
+# Clean up the initramfs networking on first boot
+# so the real network is being brought up
+
+[Unit]
+Description=Tear down initramfs networking
+DefaultDependencies=false
+After=ignition-files.service
+
+# Make sure ExecStop= runs before we switch root
+Conflicts=initrd-switch-root.target umount.target
+Before=initrd-switch-root.target
+
+# Make sure if ExecStart= fails, the boot fails
+OnFailure=emergency.target
+OnFailureJobMode=isolate
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStop=/usr/sbin/coreos-teardown-initramfs-network

dracut/30ignition/coreos-teardown-initramfs-network.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+set -euo pipefail
+
+# Clean up the interfaces set up in the initramfs
+# This mimics the behaviour of dracut's ifdown() in net-lib.sh
+if ! [ -z "$(ls /sys/class/net)" ]; then
+    for f in /sys/class/net/*; do
+        interface=$(basename "$f")
+        ip link set $interface down
+        ip addr flush dev $interface
+        rm -f -- /tmp/net.$interface.did-setup
+    done
+fi

dracut/30ignition/ignition-generator

@@ -39,6 +39,7 @@ if $(cmdline_bool 'ignition.firstboot' 0); then
     add_requires ignition-disks.service
     add_requires ignition-files.service
     add_requires ignition-ask-var-mount.service
+    add_requires coreos-teardown-initramfs-network.service
     #if [[ $(cmdline_arg coreos.oem.id) == "packet" ]]; then
     #    add_requires coreos-static-network.service
     #fi

dracut/30ignition/module-setup.sh

@@ -28,6 +28,9 @@ install() {
     inst_script "$moddir/ignition-setup.sh" \
         "/usr/sbin/ignition-setup"
 
+    inst_script "$moddir/coreos-teardown-initramfs-network.sh" \
+	"/usr/sbin/coreos-teardown-initramfs-network"
+
 #   inst_script "$moddir/retry-umount.sh" \
 #       "/usr/sbin/retry-umount"
 
@@ -51,6 +54,9 @@ install() {
     inst_simple "$moddir/ignition-remount-sysroot.service" \
         "$systemdutildir/system/ignition-remount-sysroot.service"
 
+    inst_simple "$moddir/coreos-teardown-initramfs-network.service" \
+        "$systemdutildir/system/coreos-teardown-initramfs-network.service"
+
 #   inst_simple "$moddir/sysroot-boot.service" \
 #       "$systemdsystemunitdir/sysroot-boot.service"