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moby--moby/daemon/create_unix.go
Daniel Nephin 93fbdb69ac Remove error return from RootPair
There is no case which would resolve in this error. The root user always exists, and if the id maps are empty, the default value of 0 is correct.

Signed-off-by: Daniel Nephin <dnephin@docker.com>
2017-06-07 11:45:33 -04:00

81 lines
2.3 KiB
Go

// +build !windows
package daemon
import (
"fmt"
"os"
"path/filepath"
"github.com/Sirupsen/logrus"
containertypes "github.com/docker/docker/api/types/container"
mounttypes "github.com/docker/docker/api/types/mount"
"github.com/docker/docker/container"
"github.com/docker/docker/pkg/stringid"
"github.com/opencontainers/selinux/go-selinux/label"
)
// createContainerPlatformSpecificSettings performs platform specific container create functionality
func (daemon *Daemon) createContainerPlatformSpecificSettings(container *container.Container, config *containertypes.Config, hostConfig *containertypes.HostConfig) error {
if err := daemon.Mount(container); err != nil {
return err
}
defer daemon.Unmount(container)
rootIDs := daemon.idMappings.RootPair()
if err := container.SetupWorkingDirectory(rootIDs); err != nil {
return err
}
for spec := range config.Volumes {
name := stringid.GenerateNonCryptoID()
destination := filepath.Clean(spec)
// 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 err
}
stat, err := os.Stat(path)
if err == nil && !stat.IsDir() {
return fmt.Errorf("cannot mount volume over existing file, file exists %s", path)
}
v, err := daemon.volumes.CreateWithRef(name, hostConfig.VolumeDriver, container.ID, nil, nil)
if err != nil {
return err
}
if err := label.Relabel(v.Path(), container.MountLabel, true); err != nil {
return err
}
container.AddMountPointWithVolume(destination, v, true)
}
return daemon.populateVolumes(container)
}
// populateVolumes copies data from the container's rootfs into the volume for non-binds.
// this is only called when the container is created.
func (daemon *Daemon) populateVolumes(c *container.Container) error {
for _, mnt := range c.MountPoints {
if mnt.Volume == nil {
continue
}
if mnt.Type != mounttypes.TypeVolume || !mnt.CopyData {
continue
}
logrus.Debugf("copying image data from %s:%s, to %s", c.ID, mnt.Destination, mnt.Name)
if err := c.CopyImagePathContent(mnt.Volume, mnt.Destination); err != nil {
return err
}
}
return nil
}