| package sysinit |
| |
| import ( |
| "encoding/json" |
| "flag" |
| "fmt" |
| "github.com/dotcloud/docker/execdriver" |
| _ "github.com/dotcloud/docker/execdriver/lxc" |
| _ "github.com/dotcloud/docker/execdriver/native" |
| "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) |
| } |
| |
| // 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") |
| pipe = flag.Int("pipe", 0, "sync pipe fd") |
| console = flag.String("console", "", "console (pty slave) path") |
| root = flag.String("root", ".", "root path for configuration files") |
| ) |
| 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, |
| Console: *console, |
| Pipe: *pipe, |
| Root: *root, |
| } |
| |
| if err := executeProgram(args); err != nil { |
| log.Fatal(err) |
| } |
| } |