dotcloud/docker

package daemon // import "github.com/docker/docker/daemon"

import (
    "context"
    "fmt"
    "strings"

    "github.com/containerd/log"
    mounttypes "github.com/docker/docker/api/types/mount"
    "github.com/docker/docker/container"
    volumesservice "github.com/docker/docker/volume/service"
)

func (daemon *Daemon) prepareMountPoints(container *container.Container) error {
    alive := container.IsRunning()
    for _, config := range container.MountPoints {
        if err := daemon.lazyInitializeVolume(container.ID, config); err != nil {
            return err
        }
        if config.Volume == nil {
            // FIXME(thaJeztah): should we check for config.Type here as well? (i.e., skip bind-mounts etc)
            continue
        }
        if alive {
            log.G(context.TODO()).WithFields(log.Fields{
                "container": container.ID,
                "volume":    config.Volume.Name(),
            }).Debug("Live-restoring volume for alive container")
            if err := config.LiveRestore(context.TODO()); err != nil {
                return err
            }
        }
    }
    return nil
}

func (daemon *Daemon) removeMountPoints(container *container.Container, rm bool) error {
    var rmErrors []string
    ctx := context.TODO()
    for _, m := range container.MountPoints {
        if m.Type != mounttypes.TypeVolume || m.Volume == nil {
            continue
        }
        daemon.volumes.Release(ctx, m.Volume.Name(), container.ID)
        if !rm {
            continue
        }

        // Do not remove named mountpoints
        // these are mountpoints specified like `docker run -v <name>:/foo`
        if m.Spec.Source != "" {
            continue
        }

        err := daemon.volumes.Remove(ctx, m.Volume.Name())
        // Ignore volume in use errors because having this
        // volume being referenced by other container is
        // not an error, but an implementation detail.
        // This prevents docker from logging "ERROR: Volume in use"
        // where there is another container using the volume.
        if err != nil && !volumesservice.IsInUse(err) {
            rmErrors = append(rmErrors, err.Error())
        }
    }

    if len(rmErrors) > 0 {
        return fmt.Errorf("Error removing volumes:\n%v", strings.Join(rmErrors, "\n"))
    }
    return nil
}