An attempt at reproducing device busy errors

dockerrash.go

package main

import (
	"log"
	"os"
	"os/exec"
	"sync"
)

const testImage = "ubuntu"

func dockerPull() {
	log.Printf("Pulling test image: %s", testImage)
	cmd := exec.Command("docker", "pull", testImage)
	output, err := cmd.CombinedOutput()
	if err != nil {
		log.Fatal("Could not pull docker image %s:\n\n%s", testImage, string(output))
	}
}

func dockerRunit() {
	cmd := exec.Command("docker", "run", "-rm", testImage, "/bin/sh", "-c", "touch foo && chown 9999:9999 foo && ls -l1 foo | awk '{ print $3, $4 }'")
	output, err := cmd.CombinedOutput()
	if err != nil {
		log.Printf("docker run... %s:\n\n%s", err, string(output))
	}
}

func versionInfo() {

	for _, cmdStr := range []string{"docker version", "lxc-version", "uname -srvmpio"} {
		log.Printf("executing: %s", cmdStr)
		cmd :=  exec.Command("sh", "-c", cmdStr)
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		cmd.Run()
	}
}

func main() {
	versionInfo()
	dockerPull()
	count := 100
	wg := sync.WaitGroup{}
	wg.Add(count)
	log.Printf("About to run %d test containers concurrently.", count)
	for i := 0; i < count; i++ {
		go func() {
			dockerRunit()
			wg.Done()
		}()
	}
	wg.Wait()
}