131 lines
3 KiB
Go
131 lines
3 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"github.com/dotcloud/docker"
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"github.com/dotcloud/docker/utils"
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"io/ioutil"
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"log"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"syscall"
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)
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var (
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GIT_COMMIT string
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)
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func main() {
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if utils.SelfPath() == "/sbin/init" {
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// Running in init mode
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docker.SysInit()
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return
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}
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host := "127.0.0.1"
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port := 4243
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// FIXME: Switch d and D ? (to be more sshd like)
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flDaemon := flag.Bool("d", false, "Daemon mode")
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flDebug := flag.Bool("D", false, "Debug mode")
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flAutoRestart := flag.Bool("r", false, "Restart previously running containers")
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bridgeName := flag.String("b", "", "Attach containers to a pre-existing network bridge")
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pidfile := flag.String("p", "/var/run/docker.pid", "File containing process PID")
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flHost := flag.String("H", fmt.Sprintf("%s:%d", host, port), "Host:port to bind/connect to")
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flag.Parse()
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if *bridgeName != "" {
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docker.NetworkBridgeIface = *bridgeName
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} else {
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docker.NetworkBridgeIface = docker.DefaultNetworkBridge
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}
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if strings.Contains(*flHost, ":") {
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hostParts := strings.Split(*flHost, ":")
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if len(hostParts) != 2 {
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log.Fatal("Invalid bind address format.")
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os.Exit(-1)
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}
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if hostParts[0] != "" {
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host = hostParts[0]
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}
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if p, err := strconv.Atoi(hostParts[1]); err == nil {
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port = p
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}
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} else {
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host = *flHost
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}
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if *flDebug {
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os.Setenv("DEBUG", "1")
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}
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docker.GIT_COMMIT = GIT_COMMIT
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if *flDaemon {
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if flag.NArg() != 0 {
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flag.Usage()
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return
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}
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if err := daemon(*pidfile, host, port, *flAutoRestart); err != nil {
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log.Fatal(err)
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os.Exit(-1)
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}
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} else {
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if err := docker.ParseCommands(host, port, flag.Args()...); err != nil {
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log.Fatal(err)
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os.Exit(-1)
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}
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}
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}
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func createPidFile(pidfile string) error {
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if pidString, err := ioutil.ReadFile(pidfile); err == nil {
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pid, err := strconv.Atoi(string(pidString))
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if err == nil {
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if _, err := os.Stat(fmt.Sprintf("/proc/%d/", pid)); err == nil {
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return fmt.Errorf("pid file found, ensure docker is not running or delete %s", pidfile)
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}
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}
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}
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file, err := os.Create(pidfile)
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if err != nil {
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return err
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}
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defer file.Close()
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_, err = fmt.Fprintf(file, "%d", os.Getpid())
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return err
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}
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func removePidFile(pidfile string) {
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if err := os.Remove(pidfile); err != nil {
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log.Printf("Error removing %s: %s", pidfile, err)
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}
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}
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func daemon(pidfile, addr string, port int, autoRestart bool) error {
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if addr != "127.0.0.1" {
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log.Println("/!\\ DON'T BIND ON ANOTHER IP ADDRESS THAN 127.0.0.1 IF YOU DON'T KNOW WHAT YOU'RE DOING /!\\")
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}
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if err := createPidFile(pidfile); err != nil {
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log.Fatal(err)
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}
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defer removePidFile(pidfile)
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt, os.Kill, os.Signal(syscall.SIGTERM))
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go func() {
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sig := <-c
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log.Printf("Received signal '%v', exiting\n", sig)
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removePidFile(pidfile)
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os.Exit(0)
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}()
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server, err := docker.NewServer(autoRestart)
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if err != nil {
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return err
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}
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return docker.ListenAndServe(fmt.Sprintf("%s:%d", addr, port), server, true)
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}
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