func copyFromContainer(ctx context.Context, dockerCli *client.DockerCli, srcContainer, srcPath, dstPath string, cpParam *cpConfig) (err error) {
if dstPath != "-" {
// Get an absolute destination path.
dstPath, err = resolveLocalPath(dstPath)
if err != nil {
return err
}
}
// if client requests to follow symbol link, then must decide target file to be copied
var rebaseName string
if cpParam.followLink {
srcStat, err := statContainerPath(ctx, dockerCli, srcContainer, srcPath)
// If the destination is a symbolic link, we should follow it.
if err == nil && srcStat.Mode&os.ModeSymlink != 0 {
linkTarget := srcStat.LinkTarget
if !system.IsAbs(linkTarget) {
// Join with the parent directory.
srcParent, _ := archive.SplitPathDirEntry(srcPath)
linkTarget = filepath.Join(srcParent, linkTarget)
}
linkTarget, rebaseName = archive.GetRebaseName(srcPath, linkTarget)
srcPath = linkTarget
}
}
content, stat, err := dockerCli.Client().CopyFromContainer(ctx, srcContainer, srcPath)
if err != nil {
return err
}
defer content.Close()
if dstPath == "-" {
// Send the response to STDOUT.
_, err = io.Copy(os.Stdout, content)
return err
}
// Prepare source copy info.
srcInfo := archive.CopyInfo{
Path: srcPath,
Exists: true,
IsDir: stat.Mode.IsDir(),
RebaseName: rebaseName,
}
preArchive := content
if len(srcInfo.RebaseName) != 0 {
_, srcBase := archive.SplitPathDirEntry(srcInfo.Path)
preArchive = archive.RebaseArchiveEntries(content, srcBase, srcInfo.RebaseName)
}
// See comments in the implementation of `archive.CopyTo` for exactly what
// goes into deciding how and whether the source archive needs to be
// altered for the correct copy behavior.
return archive.CopyTo(preArchive, srcInfo, dstPath)
}
func (cli *DockerCli) copyFromContainer(srcContainer, srcPath, dstPath string, cpParam *cpConfig) (err error) {
if dstPath != "-" {
// Get an absolute destination path.
dstPath, err = resolveLocalPath(dstPath)
if err != nil {
return err
}
}
// if client requests to follow symbol link, then must decide target file to be copied
var rebaseName string
if cpParam.followLink {
srcStat, err := cli.statContainerPath(srcContainer, srcPath)
// If the destination is a symbolic link, we should follow it.
if err == nil && srcStat.Mode&os.ModeSymlink != 0 {
linkTarget := srcStat.LinkTarget
if !system.IsAbs(linkTarget) {
// Join with the parent directory.
srcParent, _ := archive.SplitPathDirEntry(srcPath)
linkTarget = filepath.Join(srcParent, linkTarget)
}
linkTarget, rebaseName = archive.GetRebaseName(srcPath, linkTarget)
srcPath = linkTarget
}
}
query := make(url.Values, 1)
query.Set("path", filepath.ToSlash(srcPath)) // Normalize the paths used in the API.
urlStr := fmt.Sprintf("/containers/%s/archive?%s", srcContainer, query.Encode())
response, err := cli.call("GET", urlStr, nil, nil)
if err != nil {
return err
}
defer response.body.Close()
if response.statusCode != http.StatusOK {
return fmt.Errorf("unexpected status code from daemon: %d", response.statusCode)
}
if dstPath == "-" {
// Send the response to STDOUT.
_, err = io.Copy(os.Stdout, response.body)
return err
}
// In order to get the copy behavior right, we need to know information
// about both the source and the destination. The response headers include
// stat info about the source that we can use in deciding exactly how to
// copy it locally. Along with the stat info about the local destination,
// we have everything we need to handle the multiple possibilities there
// can be when copying a file/dir from one location to another file/dir.
stat, err := getContainerPathStatFromHeader(response.header)
if err != nil {
return fmt.Errorf("unable to get resource stat from response: %s", err)
}
// Prepare source copy info.
srcInfo := archive.CopyInfo{
Path: srcPath,
Exists: true,
IsDir: stat.Mode.IsDir(),
RebaseName: rebaseName,
}
preArchive := response.body
if len(srcInfo.RebaseName) != 0 {
_, srcBase := archive.SplitPathDirEntry(srcInfo.Path)
preArchive = archive.RebaseArchiveEntries(response.body, srcBase, srcInfo.RebaseName)
}
// See comments in the implementation of `archive.CopyTo` for exactly what
// goes into deciding how and whether the source archive needs to be
// altered for the correct copy behavior.
return archive.CopyTo(preArchive, srcInfo, dstPath)
}