Manually pass the env to docker-init instead of relying on lxc to pass it

container.go

@@ -390,21 +390,26 @@ func (container *Container) Start() error {
 		params = append(params, "-u", container.Config.User)
 	}
 
+	if container.Config.Tty {
+		params = append(params, "-e", "TERM=xterm")
+	}
+
+	// Setup environment
+	params = append(params,
+		"-e", "HOME=/",
+		"-e", "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+	)
+
+	for _, elem := range container.Config.Env {
+		params = append(params, "-e", elem)
+	}
+
 	// Program
 	params = append(params, "--", container.Path)
 	params = append(params, container.Args...)
 
 	container.cmd = exec.Command("lxc-start", params...)
 
-	// Setup environment
-	container.cmd.Env = append(
-		[]string{
-			"HOME=/",
-			"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
-		},
-		container.Config.Env...,
-	)
-
 	// Setup logging of stdout and stderr to disk
 	if err := container.runtime.LogToDisk(container.stdout, container.logPath("stdout")); err != nil {
 		return err
@@ -415,10 +420,6 @@ func (container *Container) Start() error {
 
 	var err error
 	if container.Config.Tty {
-		container.cmd.Env = append(
-			[]string{"TERM=xterm"},
-			container.cmd.Env...,
-		)
 		err = container.startPty()
 	} else {
 		err = container.start()

sysinit.go

@@ -53,8 +53,7 @@ func changeUser(u string) {
 }
 
 // Clear environment pollution introduced by lxc-start
-func cleanupEnv() {
-	env := os.Environ()
+func cleanupEnv(env ListOpts) {
 	os.Clearenv()
 	for _, kv := range env {
 		parts := strings.SplitN(kv, "=", 2)
@@ -91,10 +90,13 @@ func SysInit() {
 	var u = flag.String("u", "", "username or uid")
 	var gw = flag.String("g", "", "gateway address")
 
+	var flEnv ListOpts
+	flag.Var(&flEnv, "e", "Set environment variables")
+
 	flag.Parse()
 
+	cleanupEnv(flEnv)
 	setupNetworking(*gw)
-	cleanupEnv()
 	changeUser(*u)
 	executeProgram(flag.Arg(0), flag.Args())
 }