Working out why linuxkit crashes in bootup by labeling init stages

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

main.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/containernetworking/cni/plugins/ipam/host-local"
 	"github.com/containernetworking/cni/plugins/main/bridge"
 	"github.com/docker/docker/docker"
@@ -42,6 +45,18 @@ var entrypoints = map[string]func(){
 }
 
 func main() {
+	if 0 == 1 {
+		// TODO: move this into a "dev/debug +build"
+		fmt.Fprintf(os.Stderr, "ros main(%s) ppid:%d - print to stdio\n", os.Args[0], os.Getppid())
+
+		filename := "/dev/kmsg"
+		f, err := os.OpenFile(filename, os.O_WRONLY, 0644)
+		if err == nil {
+			fmt.Fprintf(f, "ros main(%s) ppid:%d - print to %s\n", os.Args[0], os.Getppid(), filename)
+		}
+		f.Close()
+	}
+
 	for name, f := range entrypoints {
 		reexec.Register(name, f)
 	}