// Mount sets container.BaseFS
// (is it not set coming in? why is it unset?)
func (daemon *Daemon) Mount(container *container.Container) error {
var layerID layer.ChainID
if container.ImageID != "" {
img, err := daemon.imageStore.Get(container.ImageID)
if err != nil {
return err
}
layerID = img.RootFS.ChainID()
}
rwlayer, err := daemon.layerStore.Mount(container.ID, layerID, container.GetMountLabel(), daemon.setupInitLayer)
if err != nil {
return err
}
dir, err := rwlayer.Path()
if err != nil {
return err
}
logrus.Debugf("container mounted via layerStore: %v", dir)
if 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 container.BaseFS != "" && runtime.GOOS != "windows" {
daemon.Unmount(container)
return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')",
daemon.driver, container.ID, container.BaseFS, dir)
}
}
container.BaseFS = dir // TODO: combine these fields
container.RWLayer = rwlayer
return nil
}
func (daemon *Daemon) setRWLayer(container *container.Container) error {
var layerID layer.ChainID
if container.ImageID != "" {
img, err := daemon.imageStore.Get(container.ImageID)
if err != nil {
return err
}
layerID = img.RootFS.ChainID()
}
rwLayer, err := daemon.layerStore.CreateRWLayer(container.ID, layerID, container.MountLabel, daemon.setupInitLayer, container.HostConfig.StorageOpt)
if err != nil {
return err
}
container.RWLayer = rwLayer
return nil
}
func (daemon *Daemon) setRWLayer(container *container.Container) error {
var layerID layer.ChainID
if container.ImageID != "" {
img, err := daemon.imageStore.Get(container.ImageID)
if err != nil {
return err
}
//获取镜像层
layerID = img.RootFS.ChainID()
}
//通过镜像层ID，容器ID，MountLabel以及初始化层（例如/dev/pts,/proc,/sys,/etc/hosts等目录）创建可读写层
//关于setupInitLayer中的内容可以参考daemon/daemon_unix.go
rwLayer, err := daemon.layerStore.CreateRWLayer(container.ID, layerID, container.MountLabel, daemon.setupInitLayer)
if err != nil {
return err
}
container.RWLayer = rwLayer
return nil
}
func (daemon *Daemon) setRWLayer(container *container.Container) error {
var layerID layer.ChainID
if container.ImageID != "" {
img, err := daemon.imageStore.Get(container.ImageID)
if err != nil {
return err
}
layerID = img.RootFS.ChainID()
}
rwLayerOpts := &layer.CreateRWLayerOpts{
MountLabel: container.MountLabel,
InitFunc: daemon.getLayerInit(),
StorageOpt: container.HostConfig.StorageOpt,
}
rwLayer, err := daemon.layerStore.CreateRWLayer(container.ID, layerID, rwLayerOpts)
if err != nil {
return err
}
container.RWLayer = rwLayer
return nil
}