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package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"fmt"
"strings"
"github.com/containerd/log"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/libnetwork"
"github.com/pkg/errors"
)
// ContainerRename changes the name of a container, using the oldName
// to find the container. An error is returned if newName is already
// reserved.
func (daemon *Daemon) ContainerRename(oldName, newName string) (retErr error) {
if oldName == "" || newName == "" {
return errdefs.InvalidParameter(errors.New("Neither old nor new names may be empty"))
}
ctr, err := daemon.GetContainer(oldName)
if err != nil {
return err
}
ctr.Lock()
defer ctr.Unlock()
// Canonicalize name for comparing.
if newName[0] != '/' {
newName = "/" + newName
}
if ctr.Name == newName {
return errdefs.InvalidParameter(errors.New("Renaming a container with the same name as its current name"))
}
links := map[string]*container.Container{}
for k, v := range daemon.linkIndex.children(ctr) {
if !strings.HasPrefix(k, ctr.Name) {
return errdefs.InvalidParameter(errors.Errorf("Linked container %s does not match parent %s", k, ctr.Name))
}
links[strings.TrimPrefix(k, ctr.Name)] = v
}
newName, err = daemon.reserveName(ctr.ID, newName)
if err != nil {
return errors.Wrap(err, "Error when allocating new name")
}
for k, v := range links {
daemon.containersReplica.ReserveName(newName+k, v.ID)
daemon.linkIndex.link(ctr, v, newName+k)
}
oldName = ctr.Name
ctr.Name = newName
defer func() {
if retErr != nil {
ctr.Name = oldName
daemon.reserveName(ctr.ID, oldName)
for k, v := range links {
daemon.containersReplica.ReserveName(oldName+k, v.ID)
daemon.linkIndex.link(ctr, v, oldName+k)
daemon.linkIndex.unlink(newName+k, v, ctr)
daemon.containersReplica.ReleaseName(newName + k)
}
daemon.releaseName(newName)
} else {
daemon.releaseName(oldName)
}
}()
for k, v := range links {
daemon.linkIndex.unlink(oldName+k, v, ctr)
daemon.containersReplica.ReleaseName(oldName + k)
}
if err := ctr.CheckpointTo(context.TODO(), daemon.containersReplica); err != nil {
return err
}
if !ctr.Running {
daemon.LogContainerEventWithAttributes(ctr, events.ActionRename, map[string]string{
"oldName": oldName,
})
return nil
}
defer func() {
if retErr != nil {
ctr.Name = oldName
if err := ctr.CheckpointTo(context.WithoutCancel(context.TODO()), daemon.containersReplica); err != nil {
log.G(context.TODO()).WithFields(log.Fields{
"containerID": ctr.ID,
"error": err,
}).Error("failed to write container state to disk during rename")
}
}
}()
if sid := ctr.NetworkSettings.SandboxID; sid != "" && daemon.netController != nil {
sb, err := daemon.netController.SandboxByID(sid)
if err != nil {
return err
}
if err = sb.Rename(strings.TrimPrefix(ctr.Name, "/")); err != nil {
return err
}
defer func() {
if retErr != nil {
if err := sb.Rename(oldName); err != nil {
log.G(context.TODO()).WithFields(log.Fields{
"sandboxID": sid,
"oldName": oldName,
"newName": newName,
"error": err,
}).Errorf("failed to revert sandbox rename")
}
}
}()
for nwName, epConfig := range ctr.NetworkSettings.Networks {
nw, err := daemon.FindNetwork(nwName)
if err != nil {
return err
}
ep := sb.GetEndpoint(epConfig.EndpointID)
if ep == nil {
return fmt.Errorf("no endpoint attached to network %s found", nw.Name())
}
oldDNSNames := make([]string, len(epConfig.DNSNames))
copy(oldDNSNames, epConfig.DNSNames)
epConfig.DNSNames = buildEndpointDNSNames(ctr, epConfig.Aliases)
if err := ep.UpdateDNSNames(epConfig.DNSNames); err != nil {
return err
}
defer func(ep *libnetwork.Endpoint, epConfig *network.EndpointSettings, oldDNSNames []string) {
if retErr == nil {
return
}
epConfig.DNSNames = oldDNSNames
if err := ep.UpdateDNSNames(epConfig.DNSNames); err != nil {
log.G(context.TODO()).WithFields(log.Fields{
"sandboxID": sid,
"oldName": oldName,
"newName": newName,
"error": err,
}).Errorf("failed to revert DNSNames update")
}
}(ep, epConfig, oldDNSNames)
}
}
daemon.LogContainerEventWithAttributes(ctr, events.ActionRename, map[string]string{
"oldName": oldName,
})
return nil
}
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