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package daemon
import (
"fmt"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/container"
"github.com/docker/docker/pkg/namesgenerator"
"github.com/docker/docker/pkg/registrar"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/utils"
)
var (
validContainerNameChars = utils . RestrictedNameChars
validContainerNamePattern = utils . RestrictedNamePattern
)
func ( daemon * Daemon ) registerName ( container * container . Container ) error {
if daemon . Exists ( container . ID ) {
return fmt . Errorf ( "Container is already loaded" )
}
if e rr := 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 ( 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 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
}
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func validateID ( id string ) error {
if id == "" {
return fmt . Errorf ( "Invalid empty id" )
}
return nil
}