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package containerfs // import "github.com/docker/docker/pkg/containerfs"
import (
"path/filepath"
"runtime"
"github.com/containerd/continuity/driver"
"github.com/containerd/continuity/pathdriver"
"github.com/moby/sys/symlink"
)
// ContainerFS is that represents a root file system
type ContainerFS interface {
// Path returns the path to the root. Note that this may not exist
// on the local system, so the continuity operations must be used
Path() string
// ResolveScopedPath evaluates the given path scoped to the root.
// For example, if root=/a, and path=/b/c, then this function would return /a/b/c.
// If rawPath is true, then the function will not preform any modifications
// before path resolution. Otherwise, the function will clean the given path
// by making it an absolute path.
ResolveScopedPath(path string, rawPath bool) (string, error)
Driver
}
// Driver combines both continuity's Driver and PathDriver interfaces with a Platform
// field to determine the OS.
type Driver interface {
// OS returns the OS where the rootfs is located. Essentially,
// runtime.GOOS for everything aside from LCOW, which is "linux"
OS() string
// Architecture returns the hardware architecture where the
// container is located.
Architecture() string
// Driver & PathDriver provide methods to manipulate files & paths
driver.Driver
pathdriver.PathDriver
}
// NewLocalContainerFS is a helper function to implement daemon's Mount interface
// when the graphdriver mount point is a local path on the machine.
func NewLocalContainerFS(path string) ContainerFS {
return &local{
path: path,
Driver: driver.LocalDriver,
PathDriver: pathdriver.LocalPathDriver,
}
}
// NewLocalDriver provides file and path drivers for a local file system. They are
// essentially a wrapper around the `os` and `filepath` functions.
func NewLocalDriver() Driver {
return &local{
Driver: driver.LocalDriver,
PathDriver: pathdriver.LocalPathDriver,
}
}
type local struct {
path string
driver.Driver
pathdriver.PathDriver
}
func (l *local) Path() string {
return l.path
}
func (l *local) ResolveScopedPath(path string, rawPath bool) (string, error) {
cleanedPath := path
if !rawPath {
cleanedPath = cleanScopedPath(path)
}
return symlink.FollowSymlinkInScope(filepath.Join(l.path, cleanedPath), l.path)
}
func (l *local) OS() string {
return runtime.GOOS
}
func (l *local) Architecture() string {
return runtime.GOARCH
}
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