1
0
Fork 0
mirror of https://github.com/moby/moby.git synced 2022-11-09 12:21:53 -05:00
moby--moby/docker/daemon.go
Antonio Murdaca 531f4122bd Remove engine mechanism
Signed-off-by: Antonio Murdaca <me@runcom.ninja>
2015-04-30 01:35:16 +02:00

209 lines
5.2 KiB
Go

// +build daemon
package main
import (
"fmt"
"io"
"os"
"path/filepath"
"time"
"github.com/Sirupsen/logrus"
apiserver "github.com/docker/docker/api/server"
"github.com/docker/docker/autogen/dockerversion"
"github.com/docker/docker/daemon"
_ "github.com/docker/docker/daemon/execdriver/lxc"
_ "github.com/docker/docker/daemon/execdriver/native"
"github.com/docker/docker/pkg/homedir"
flag "github.com/docker/docker/pkg/mflag"
"github.com/docker/docker/pkg/pidfile"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/pkg/timeutils"
"github.com/docker/docker/registry"
)
const CanDaemon = true
var (
daemonCfg = &daemon.Config{}
registryCfg = &registry.Options{}
)
func init() {
daemonCfg.InstallFlags()
registryCfg.InstallFlags()
}
func migrateKey() (err error) {
// Migrate trust key if exists at ~/.docker/key.json and owned by current user
oldPath := filepath.Join(homedir.Get(), ".docker", defaultTrustKeyFile)
newPath := filepath.Join(getDaemonConfDir(), defaultTrustKeyFile)
if _, statErr := os.Stat(newPath); os.IsNotExist(statErr) && currentUserIsOwner(oldPath) {
defer func() {
// Ensure old path is removed if no error occurred
if err == nil {
err = os.Remove(oldPath)
} else {
logrus.Warnf("Key migration failed, key file not removed at %s", oldPath)
}
}()
if err := os.MkdirAll(getDaemonConfDir(), os.FileMode(0644)); err != nil {
return fmt.Errorf("Unable to create daemon configuration directory: %s", err)
}
newFile, err := os.OpenFile(newPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return fmt.Errorf("error creating key file %q: %s", newPath, err)
}
defer newFile.Close()
oldFile, err := os.Open(oldPath)
if err != nil {
return fmt.Errorf("error opening key file %q: %s", oldPath, err)
}
defer oldFile.Close()
if _, err := io.Copy(newFile, oldFile); err != nil {
return fmt.Errorf("error copying key: %s", err)
}
logrus.Infof("Migrated key from %s to %s", oldPath, newPath)
}
return nil
}
func mainDaemon() {
if flag.NArg() != 0 {
flag.Usage()
return
}
logrus.SetFormatter(&logrus.TextFormatter{TimestampFormat: timeutils.RFC3339NanoFixed})
var pfile *pidfile.PidFile
if daemonCfg.Pidfile != "" {
pf, err := pidfile.New(daemonCfg.Pidfile)
if err != nil {
logrus.Fatalf("Error starting daemon: %v", err)
}
pfile = pf
defer func() {
if err := pfile.Remove(); err != nil {
logrus.Error(err)
}
}()
}
if err := migrateKey(); err != nil {
logrus.Fatal(err)
}
daemonCfg.TrustKeyPath = *flTrustKey
registryService := registry.NewService(registryCfg)
d, err := daemon.NewDaemon(daemonCfg, registryService)
if err != nil {
if pfile != nil {
if err := pfile.Remove(); err != nil {
logrus.Error(err)
}
}
logrus.Fatalf("Error starting daemon: %v", err)
}
logrus.Info("Daemon has completed initialization")
logrus.WithFields(logrus.Fields{
"version": dockerversion.VERSION,
"commit": dockerversion.GITCOMMIT,
"execdriver": d.ExecutionDriver().Name(),
"graphdriver": d.GraphDriver().String(),
}).Info("Docker daemon")
serverConfig := &apiserver.ServerConfig{
Logging: true,
EnableCors: daemonCfg.EnableCors,
CorsHeaders: daemonCfg.CorsHeaders,
Version: dockerversion.VERSION,
SocketGroup: daemonCfg.SocketGroup,
Tls: *flTls,
TlsVerify: *flTlsVerify,
TlsCa: *flCa,
TlsCert: *flCert,
TlsKey: *flKey,
}
api := apiserver.New(serverConfig)
// The serve API routine never exits unless an error occurs
// We need to start it as a goroutine and wait on it so
// daemon doesn't exit
serveAPIWait := make(chan error)
go func() {
if err := api.ServeApi(flHosts); err != nil {
logrus.Errorf("ServeAPI error: %v", err)
serveAPIWait <- err
return
}
serveAPIWait <- nil
}()
signal.Trap(func() {
api.Close()
<-serveAPIWait
shutdownDaemon(d, 15)
if pfile != nil {
if err := pfile.Remove(); err != nil {
logrus.Error(err)
}
}
})
// after the daemon is done setting up we can tell the api to start
// accepting connections with specified daemon
api.AcceptConnections(d)
// Daemon is fully initialized and handling API traffic
// Wait for serve API to complete
errAPI := <-serveAPIWait
shutdownDaemon(d, 15)
if errAPI != nil {
if pfile != nil {
if err := pfile.Remove(); err != nil {
logrus.Error(err)
}
}
logrus.Fatalf("Shutting down due to ServeAPI error: %v", errAPI)
}
}
// shutdownDaemon just wraps daemon.Shutdown() to handle a timeout in case
// d.Shutdown() is waiting too long to kill container or worst it's
// blocked there
func shutdownDaemon(d *daemon.Daemon, timeout time.Duration) {
ch := make(chan struct{})
go func() {
d.Shutdown()
close(ch)
}()
select {
case <-ch:
logrus.Debug("Clean shutdown succeded")
case <-time.After(timeout * time.Second):
logrus.Error("Force shutdown daemon")
}
}
// currentUserIsOwner checks whether the current user is the owner of the given
// file.
func currentUserIsOwner(f string) bool {
if fileInfo, err := system.Stat(f); err == nil && fileInfo != nil {
if int(fileInfo.Uid()) == os.Getuid() {
return true
}
}
return false
}