// containerStatPath stats the filesystem resource at the specified path in this
// container. Returns stat info about the resource.
func (daemon *Daemon) containerStatPath(container *container.Container, path string) (stat *types.ContainerPathStat, err error) {
container.Lock()
defer container.Unlock()
if err = daemon.Mount(container); err != nil {
return nil, err
}
defer daemon.Unmount(container)
err = daemon.mountVolumes(container)
defer container.UnmountVolumes(true, daemon.LogVolumeEvent)
if err != nil {
return nil, err
}
resolvedPath, absPath, err := container.ResolvePath(path)
if err != nil {
return nil, err
}
return container.StatPath(resolvedPath, absPath)
}
// containerArchivePath creates an archive of the filesystem resource at the specified
// path in this container. Returns a tar archive of the resource and stat info
// about the resource.
func (daemon *Daemon) containerArchivePath(container *container.Container, path string) (content io.ReadCloser, stat *types.ContainerPathStat, err error) {
container.Lock()
defer func() {
if err != nil {
// Wait to unlock the container until the archive is fully read
// (see the ReadCloseWrapper func below) or if there is an error
// before that occurs.
container.Unlock()
}
}()
if err = daemon.Mount(container); err != nil {
return nil, nil, err
}
defer func() {
if err != nil {
// unmount any volumes
container.UnmountVolumes(true, daemon.LogVolumeEvent)
// unmount the container's rootfs
daemon.Unmount(container)
}
}()
if err = daemon.mountVolumes(container); err != nil {
return nil, nil, err
}
resolvedPath, absPath, err := container.ResolvePath(path)
if err != nil {
return nil, nil, err
}
stat, err = container.StatPath(resolvedPath, absPath)
if err != nil {
return nil, nil, err
}
// We need to rebase the archive entries if the last element of the
// resolved path was a symlink that was evaluated and is now different
// than the requested path. For example, if the given path was "/foo/bar/",
// but it resolved to "/var/lib/docker/containers/{id}/foo/baz/", we want
// to ensure that the archive entries start with "bar" and not "baz". This
// also catches the case when the root directory of the container is
// requested: we want the archive entries to start with "/" and not the
// container ID.
data, err := archive.TarResourceRebase(resolvedPath, filepath.Base(absPath))
if err != nil {
return nil, nil, err
}
content = ioutils.NewReadCloserWrapper(data, func() error {
err := data.Close()
container.UnmountVolumes(true, daemon.LogVolumeEvent)
daemon.Unmount(container)
container.Unlock()
return err
})
daemon.LogContainerEvent(container, "archive-path")
return content, stat, nil
}