dotcloud/docker

package images

import (
    "context"
    "fmt"
    "runtime"

    "github.com/containerd/log"
    "github.com/docker/docker/container"
    "github.com/pkg/errors"
)

// Mount sets container.BaseFS
// (is it not set coming in? why is it unset?)
func (i *ImageService) Mount(ctx context.Context, container *container.Container) error {
    if container.RWLayer == nil {
        return errors.New("RWLayer of container " + container.ID + " is unexpectedly nil")
    }
    dir, err := container.RWLayer.Mount(container.GetMountLabel())
    if err != nil {
        return err
    }
    log.G(ctx).WithField("container", container.ID).Debugf("container mounted via layerStore: %v", dir)

    if container.BaseFS != "" && container.BaseFS != dir {
        // The mount path reported by the graph driver should always be trusted on Windows, since the
        // volume path for a given mounted layer may change over time.  This should only be an error
        // on non-Windows operating systems.
        if runtime.GOOS != "windows" {
            i.Unmount(ctx, container)
            return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')",
                i.StorageDriver(), container.ID, container.BaseFS, dir)
        }
    }
    container.BaseFS = dir // TODO: combine these fields
    return nil
}

// Unmount unsets the container base filesystem
func (i *ImageService) Unmount(ctx context.Context, container *container.Container) error {
    if container.RWLayer == nil {
        return errors.New("RWLayer of container " + container.ID + " is unexpectedly nil")
    }
    if err := container.RWLayer.Unmount(); err != nil {
        log.G(ctx).WithField("container", container.ID).WithError(err).Error("error unmounting container")
        return err
    }

    return nil
}