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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.GenerateRandomID()
)
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 errors.Is(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 errors.Is(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
}
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