package sysinit import ( "encoding/json" "flag" "fmt" "github.com/dotcloud/docker/execdriver" _ "github.com/dotcloud/docker/execdriver/chroot" _ "github.com/dotcloud/docker/execdriver/lxc" "io/ioutil" "log" "os" "strings" ) // Clear environment pollution introduced by lxc-start func setupEnv(args *execdriver.InitArgs) { os.Clearenv() for _, kv := range args.Env { parts := strings.SplitN(kv, "=", 2) if len(parts) == 1 { parts = append(parts, "") } os.Setenv(parts[0], parts[1]) } } func executeProgram(args *execdriver.InitArgs) error { setupEnv(args) dockerInitFct, err := execdriver.GetInitFunc(args.Driver) if err != nil { panic(err) } return dockerInitFct(args) if args.Driver == "lxc" { // Will never reach } else if args.Driver == "chroot" { } return nil } // Sys Init code // This code is run INSIDE the container and is responsible for setting // up the environment before running the actual process func SysInit() { if len(os.Args) <= 1 { fmt.Println("You should not invoke dockerinit manually") os.Exit(1) } var ( // Get cmdline arguments user = flag.String("u", "", "username or uid") gateway = flag.String("g", "", "gateway address") ip = flag.String("i", "", "ip address") workDir = flag.String("w", "", "workdir") privileged = flag.Bool("privileged", false, "privileged mode") mtu = flag.Int("mtu", 1500, "interface mtu") driver = flag.String("driver", "", "exec driver") ) flag.Parse() // Get env var env []string content, err := ioutil.ReadFile("/.dockerenv") if err != nil { log.Fatalf("Unable to load environment variables: %v", err) } if err := json.Unmarshal(content, &env); err != nil { log.Fatalf("Unable to unmarshal environment variables: %v", err) } // Propagate the plugin-specific container env variable env = append(env, "container="+os.Getenv("container")) args := &execdriver.InitArgs{ User: *user, Gateway: *gateway, Ip: *ip, WorkDir: *workDir, Privileged: *privileged, Env: env, Args: flag.Args(), Mtu: *mtu, Driver: *driver, } if err := executeProgram(args); err != nil { log.Fatal(err) } }