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create.go
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create.go
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package daemon
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/graph"
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/runconfig"
"github.com/opencontainers/runc/libcontainer/label"
)
func (daemon *Daemon) ContainerCreate(name string, config *runconfig.Config, hostConfig *runconfig.HostConfig) (string, []string, error) {
if config == nil {
return "", nil, fmt.Errorf("Config cannot be empty in order to create a container")
}
warnings, err := daemon.verifyContainerSettings(hostConfig, config)
if err != nil {
return "", warnings, err
}
container, buildWarnings, err := daemon.Create(config, hostConfig, name)
if err != nil {
if daemon.Graph().IsNotExist(err, config.Image) {
_, tag := parsers.ParseRepositoryTag(config.Image)
if tag == "" {
tag = graph.DEFAULTTAG
}
return "", warnings, fmt.Errorf("No such image: %s (tag: %s)", config.Image, tag)
}
return "", warnings, err
}
warnings = append(warnings, buildWarnings...)
return container.ID, warnings, nil
}
// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) Create(config *runconfig.Config, hostConfig *runconfig.HostConfig, name string) (*Container, []string, error) {
var (
container *Container
warnings []string
img *image.Image
imgID string
err error
)
if config.Image != "" {
img, err = daemon.repositories.LookupImage(config.Image)
if err != nil {
return nil, nil, err
}
if err = daemon.graph.CheckDepth(img); err != nil {
return nil, nil, err
}
imgID = img.ID
}
if err := daemon.mergeAndVerifyConfig(config, img); err != nil {
return nil, nil, err
}
if !config.NetworkDisabled && daemon.SystemConfig().IPv4ForwardingDisabled {
warnings = append(warnings, "IPv4 forwarding is disabled.")
}
if hostConfig == nil {
hostConfig = &runconfig.HostConfig{}
}
if hostConfig.SecurityOpt == nil {
hostConfig.SecurityOpt, err = daemon.GenerateSecurityOpt(hostConfig.IpcMode, hostConfig.PidMode)
if err != nil {
return nil, nil, err
}
}
if container, err = daemon.newContainer(name, config, imgID); err != nil {
return nil, nil, err
}
if err := daemon.Register(container); err != nil {
return nil, nil, err
}
if err := daemon.createRootfs(container); err != nil {
return nil, nil, err
}
if err := daemon.setHostConfig(container, hostConfig); err != nil {
return nil, nil, err
}
if err := container.Mount(); err != nil {
return nil, nil, err
}
defer container.Unmount()
for spec := range config.Volumes {
var (
name, destination string
parts = strings.Split(spec, ":")
)
switch len(parts) {
case 2:
name, destination = parts[0], filepath.Clean(parts[1])
default:
name = stringid.GenerateRandomID()
destination = filepath.Clean(parts[0])
}
// Skip volumes for which we already have something mounted on that
// destination because of a --volume-from.
if container.isDestinationMounted(destination) {
continue
}
path, err := container.GetResourcePath(destination)
if err != nil {
return nil, nil, err
}
stat, err := os.Stat(path)
if err == nil && !stat.IsDir() {
return nil, nil, fmt.Errorf("cannot mount volume over existing file, file exists %s", path)
}
v, err := createVolume(name, config.VolumeDriver)
if err != nil {
return nil, nil, err
}
if err := label.Relabel(v.Path(), container.MountLabel, "z"); err != nil {
return nil, nil, err
}
if err := container.copyImagePathContent(v, destination); err != nil {
return nil, nil, err
}
container.addMountPointWithVolume(destination, v, true)
}
if err := container.ToDisk(); err != nil {
logrus.Errorf("Error saving new container to disk: %v", err)
return nil, nil, err
}
container.LogEvent("create")
return container, warnings, nil
}
func (daemon *Daemon) GenerateSecurityOpt(ipcMode runconfig.IpcMode, pidMode runconfig.PidMode) ([]string, error) {
if ipcMode.IsHost() || pidMode.IsHost() {
return label.DisableSecOpt(), nil
}
if ipcContainer := ipcMode.Container(); ipcContainer != "" {
c, err := daemon.Get(ipcContainer)
if err != nil {
return nil, err
}
return label.DupSecOpt(c.ProcessLabel), nil
}
return nil, nil
}