Leave dhcpcd (and netconf) running in the background.

Add wait-for-network.

cmd/network/network.go

@@ -3,6 +3,7 @@ package network
 import (
 	"fmt"
 	"os"
+	"os/exec"
 
 	log "github.com/Sirupsen/logrus"
 
@@ -11,19 +12,36 @@ import (
 	"github.com/rancher/os/config"
 )
 
+const (
+	NETWORK_DONE     = "/var/run/network.done"
+	WAIT_FOR_NETWORK = "wait-for-network"
+)
+
+func sendTerm(proc string) {
+	cmd := exec.Command("killall", "-TERM", proc)
+	cmd.Stderr = os.Stderr
+	cmd.Stdout = os.Stdout
+	cmd.Run()
+}
+
 func Main() {
 	args := os.Args
 	if len(args) > 1 {
 		fmt.Println("call " + args[0] + " to load network config from cloud-config.yml")
 		return
 	}
+	os.Remove(NETWORK_DONE) // ignore error
 	cfg, err := config.LoadConfig()
 	if err != nil {
 		log.Fatal(err)
 	}
-	// Purposely ignore error
-	cloudinit.SetHostname(cfg)
+	cloudinit.SetHostname(cfg) // ignore error
 	if err := netconf.ApplyNetworkConfigs(&cfg.Rancher.Network); err != nil {
 		log.Fatal(err)
 	}
+	if _, err := os.Create(NETWORK_DONE); err != nil {
+		log.Error(err)
+	}
+	sendTerm(WAIT_FOR_NETWORK)
+	select {}
 }

cmd/waitfornetwork/waitfornetwork.go

@@ -0,0 +1,23 @@
+package waitfornetwork
+
+import (
+	"github.com/rancher/os/cmd/network"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func handleTerm() {
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, syscall.SIGTERM)
+	<-c
+	os.Exit(0)
+}
+
+func Main() {
+	go handleTerm()
+	if _, err := os.Stat(network.NETWORK_DONE); err == nil {
+		os.Exit(0)
+	}
+	select {}
+}

main.go

@@ -16,6 +16,7 @@ import (
 	"github.com/rancher/os/cmd/systemdocker"
 	"github.com/rancher/os/cmd/userdocker"
 	"github.com/rancher/os/cmd/wait"
+	"github.com/rancher/os/cmd/waitfornetwork"
 	"github.com/rancher/os/config"
 	osInit "github.com/rancher/os/init"
 )
@@ -53,6 +54,7 @@ func main() {
 	registerCmd("/usr/sbin/ros", control.Main)
 	registerCmd("/usr/bin/cloud-init", cloudinit.Main)
 	registerCmd("/usr/sbin/netconf", network.Main)
+	registerCmd("/usr/sbin/wait-for-network", waitfornetwork.Main)
 	registerCmd("/usr/sbin/wait-for-docker", wait.Main)
 
 	if !reexec.Init() {

os-config.yml

@@ -89,7 +89,7 @@ rancher:
         io.rancher.os.detach: false
         io.rancher.os.reloadconfig: true
         io.rancher.os.scope: system
-        io.rancher.os.after: cloud-init-pre,network
+        io.rancher.os.after: cloud-init-pre, wait-for-network
       net: host
       uts: host
       privileged: true
@@ -124,6 +124,7 @@ rancher:
       - /usr/bin/docker:/usr/bin/docker.dist:ro
       - /usr/bin/ros:/sbin/halt:ro
       - /usr/bin/ros:/sbin/netconf:ro
+      - /usr/bin/ros:/sbin/wait-for-network:ro
       - /usr/bin/ros:/sbin/poweroff:ro
       - /usr/bin/ros:/sbin/reboot:ro
       - /usr/bin/ros:/sbin/shutdown:ro
@@ -166,11 +167,23 @@ rancher:
     network:
       image: rancher/os-network:v0.4.1-dev
       labels:
-        io.rancher.os.detach: false
         io.rancher.os.scope: system
         io.rancher.os.after: cloud-init-pre
       net: host
       uts: host
+      pid: host
+      privileged: true
+      volumes_from:
+      - command-volumes
+      - system-volumes
+    wait-for-network:
+      image: rancher/os-network:v0.4.1-dev
+      command: wait-for-network
+      labels:
+        io.rancher.os.detach: false
+        io.rancher.os.scope: system
+        io.rancher.os.after: network
+      pid: host
       privileged: true
       volumes_from:
       - command-volumes
@@ -179,7 +192,7 @@ rancher:
       image: rancher/os-ntp:v0.4.1-dev
       labels:
         io.rancher.os.scope: system
-        io.rancher.os.after: cloud-init, network
+        io.rancher.os.after: cloud-init, wait-for-network
       net: host
       uts: host
       privileged: true