| package container |
| |
| import ( |
| "os" |
| "path/filepath" |
| |
| "github.com/docker/docker/pkg/archive" |
| "github.com/docker/docker/pkg/system" |
| "github.com/docker/engine-api/types" |
| ) |
| |
| // ResolvePath resolves the given path in the container to a resource on the |
| // host. Returns a resolved path (absolute path to the resource on the host), |
| // the absolute path to the resource relative to the container's rootfs, and |
| // an error if the path points to outside the container's rootfs. |
| func (container *Container) ResolvePath(path string) (resolvedPath, absPath string, err error) { |
| // Check if a drive letter supplied, it must be the system drive. No-op except on Windows |
| path, err = system.CheckSystemDriveAndRemoveDriveLetter(path) |
| if err != nil { |
| return "", "", err |
| } |
| |
| // Consider the given path as an absolute path in the container. |
| absPath = archive.PreserveTrailingDotOrSeparator(filepath.Join(string(filepath.Separator), path), path) |
| |
| // Split the absPath into its Directory and Base components. We will |
| // resolve the dir in the scope of the container then append the base. |
| dirPath, basePath := filepath.Split(absPath) |
| |
| resolvedDirPath, err := container.GetResourcePath(dirPath) |
| if err != nil { |
| return "", "", err |
| } |
| |
| // resolvedDirPath will have been cleaned (no trailing path separators) so |
| // we can manually join it with the base path element. |
| resolvedPath = resolvedDirPath + string(filepath.Separator) + basePath |
| |
| return resolvedPath, absPath, nil |
| } |
| |
| // StatPath is the unexported version of StatPath. Locks and mounts should |
| // be acquired before calling this method and the given path should be fully |
| // resolved to a path on the host corresponding to the given absolute path |
| // inside the container. |
| func (container *Container) StatPath(resolvedPath, absPath string) (stat *types.ContainerPathStat, err error) { |
| lstat, err := os.Lstat(resolvedPath) |
| if err != nil { |
| return nil, err |
| } |
| |
| var linkTarget string |
| if lstat.Mode()&os.ModeSymlink != 0 { |
| // Fully evaluate the symlink in the scope of the container rootfs. |
| hostPath, err := container.GetResourcePath(absPath) |
| if err != nil { |
| return nil, err |
| } |
| |
| linkTarget, err = filepath.Rel(container.BaseFS, hostPath) |
| if err != nil { |
| return nil, err |
| } |
| |
| // Make it an absolute path. |
| linkTarget = filepath.Join(string(filepath.Separator), linkTarget) |
| } |
| |
| return &types.ContainerPathStat{ |
| Name: filepath.Base(absPath), |
| Size: lstat.Size(), |
| Mode: lstat.Mode(), |
| Mtime: lstat.ModTime(), |
| LinkTarget: linkTarget, |
| }, nil |
| } |