package daemon import ( "fmt" "strings" "github.com/Sirupsen/logrus" "github.com/docker/docker/api" "github.com/docker/docker/container" "github.com/docker/docker/pkg/namesgenerator" "github.com/docker/docker/pkg/registrar" "github.com/docker/docker/pkg/stringid" ) var ( validContainerNameChars = api.RestrictedNameChars validContainerNamePattern = api.RestrictedNamePattern ) func (daemon *Daemon) registerName(container *container.Container) error { if daemon.Exists(container.ID) { return fmt.Errorf("Container is already loaded") } if err := validateID(container.ID); err != nil { return err } if container.Name == "" { name, err := daemon.generateNewName(container.ID) if err != nil { return err } container.Name = name if err := container.ToDiskLocking(); err != nil { logrus.Errorf("Error saving container name to disk: %v", err) } } return daemon.nameIndex.Reserve(container.Name, container.ID) } func (daemon *Daemon) generateIDAndName(name string) (string, string, error) { var ( err error id = stringid.GenerateNonCryptoID() ) if name == "" { if name, err = daemon.generateNewName(id); err != nil { return "", "", err } return id, name, nil } if name, err = daemon.reserveName(id, name); err != nil { return "", "", err } return id, name, nil } func (daemon *Daemon) reserveName(id, name string) (string, error) { if !validContainerNamePattern.MatchString(strings.TrimPrefix(name, "/")) { return "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars) } if name[0] != '/' { name = "/" + name } if err := daemon.nameIndex.Reserve(name, id); err != nil { if err == registrar.ErrNameReserved { id, err := daemon.nameIndex.Get(name) if err != nil { logrus.Errorf("got unexpected error while looking up reserved name: %v", err) return "", err } return "", fmt.Errorf("Conflict. The container name %q is already in use by container %s. You have to remove (or rename) that container to be able to reuse that name.", name, id) } return "", fmt.Errorf("error reserving name: %s, error: %v", name, err) } return name, nil } func (daemon *Daemon) releaseName(name string) { daemon.nameIndex.Release(name) } func (daemon *Daemon) generateNewName(id string) (string, error) { var name string for i := 0; i < 6; i++ { name = namesgenerator.GetRandomName(i) if name[0] != '/' { name = "/" + name } if err := daemon.nameIndex.Reserve(name, id); err != nil { if err == registrar.ErrNameReserved { continue } return "", err } return name, nil } name = "/" + stringid.TruncateID(id) if err := daemon.nameIndex.Reserve(name, id); err != nil { return "", err } return name, nil } func validateID(id string) error { if id == "" { return fmt.Errorf("Invalid empty id") } return nil }