package daemon // import "github.com/docker/docker/daemon" import ( "fmt" "strings" "github.com/docker/docker/container" "github.com/docker/docker/daemon/names" "github.com/docker/docker/errdefs" "github.com/docker/docker/pkg/namesgenerator" "github.com/docker/docker/pkg/stringid" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) var ( validContainerNameChars = names.RestrictedNameChars validContainerNamePattern = names.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 } return daemon.containersReplica.ReserveName(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 "", errdefs.InvalidParameter(errors.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)) } if name[0] != '/' { name = "/" + name } if err := daemon.containersReplica.ReserveName(name, id); err != nil { if err == container.ErrNameReserved { id, err := daemon.containersReplica.Snapshot().GetID(name) if err != nil { logrus.Errorf("got unexpected error while looking up reserved name: %v", err) return "", err } return "", nameConflictError{id: id, name: name} } return "", errors.Wrapf(err, "error reserving name: %q", name) } return name, nil } func (daemon *Daemon) releaseName(name string) { daemon.containersReplica.ReleaseName(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.containersReplica.ReserveName(name, id); err != nil { if err == container.ErrNameReserved { continue } return "", err } return name, nil } name = "/" + stringid.TruncateID(id) if err := daemon.containersReplica.ReserveName(name, id); err != nil { return "", err } return name, nil } func validateID(id string) error { if id == "" { return fmt.Errorf("Invalid empty id") } return nil }