package client import ( "encoding/base64" "encoding/json" "fmt" "io" "net/http" "net/url" "path/filepath" "strings" "golang.org/x/net/context" "github.com/docker/docker/api/types" ) // ContainerStatPath returns Stat information about a path inside the container filesystem. func (cli *Client) ContainerStatPath(ctx context.Context, containerID, path string) (types.ContainerPathStat, error) { query := url.Values{} query.Set("path", filepath.ToSlash(path)) // Normalize the paths used in the API. urlStr := "/containers/" + containerID + "/archive" response, err := cli.head(ctx, urlStr, query, nil) if err != nil { return types.ContainerPathStat{}, wrapResponseError(err, response, "container:path", containerID+":"+path) } defer ensureReaderClosed(response) return getContainerPathStatFromHeader(response.header) } // CopyToContainer copies content into the container filesystem. // Note that `content` must be a Reader for a TAR archive func (cli *Client) CopyToContainer(ctx context.Context, containerID, dstPath string, content io.Reader, options types.CopyToContainerOptions) error { query := url.Values{} query.Set("path", filepath.ToSlash(dstPath)) // Normalize the paths used in the API. // Do not allow for an existing directory to be overwritten by a non-directory and vice versa. if !options.AllowOverwriteDirWithFile { query.Set("noOverwriteDirNonDir", "true") } if options.CopyUIDGID { query.Set("copyUIDGID", "true") } apiPath := "/containers/" + containerID + "/archive" response, err := cli.putRaw(ctx, apiPath, query, content, nil) if err != nil { return wrapResponseError(err, response, "container:path", containerID+":"+dstPath) } defer ensureReaderClosed(response) if response.statusCode != http.StatusOK { return fmt.Errorf("unexpected status code from daemon: %d", response.statusCode) } return nil } // CopyFromContainer gets the content from the container and returns it as a Reader // for a TAR archive to manipulate it in the host. It's up to the caller to close the reader. func (cli *Client) CopyFromContainer(ctx context.Context, containerID, srcPath string) (io.ReadCloser, types.ContainerPathStat, error) { query := make(url.Values, 1) query.Set("path", filepath.ToSlash(srcPath)) // Normalize the paths used in the API. apiPath := "/containers/" + containerID + "/archive" response, err := cli.get(ctx, apiPath, query, nil) if err != nil { return nil, types.ContainerPathStat{}, wrapResponseError(err, response, "container:path", containerID+":"+srcPath) } if response.statusCode != http.StatusOK { return nil, types.ContainerPathStat{}, fmt.Errorf("unexpected status code from daemon: %d", response.statusCode) } // 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 nil, stat, fmt.Errorf("unable to get resource stat from response: %s", err) } return response.body, stat, err } func getContainerPathStatFromHeader(header http.Header) (types.ContainerPathStat, error) { var stat types.ContainerPathStat encodedStat := header.Get("X-Docker-Container-Path-Stat") statDecoder := base64.NewDecoder(base64.StdEncoding, strings.NewReader(encodedStat)) err := json.NewDecoder(statDecoder).Decode(&stat) if err != nil { err = fmt.Errorf("unable to decode container path stat header: %s", err) } return stat, err }