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