v2 api: /libpod/images/import

Implement the /libpod/images/import endpoint

Tested manually with curl:
curl -X POST --data-binary "@image.tar" --header "Content-Type: application/x-tar"

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

pkg/api/handlers/libpod/images.go

@@ -222,8 +222,50 @@ func ImagesLoad(w http.ResponseWriter, r *http.Request) {
 }
 
 func ImagesImport(w http.ResponseWriter, r *http.Request) {
-	//TODO ...
-	utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.New("/libpod/images/import is not yet implemented"))
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+	decoder := r.Context().Value("decoder").(*schema.Decoder)
+	query := struct {
+		Changes   []string `schema:"changes"`
+		Message   string   `schema:"message"`
+		Reference string   `schema:"reference"`
+		URL       string   `schema:"URL"`
+	}{
+		// Add defaults here once needed.
+	}
+
+	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
+		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
+			errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
+		return
+	}
+
+	// Check if we need to load the image from a URL or from the request's body.
+	source := query.URL
+	if len(query.URL) == 0 {
+		tmpfile, err := ioutil.TempFile("", "libpod-images-import.tar")
+		if err != nil {
+			utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
+			return
+		}
+		defer os.Remove(tmpfile.Name())
+		defer tmpfile.Close()
+
+		if _, err := io.Copy(tmpfile, r.Body); err != nil && err != io.EOF {
+			utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to write archive to temporary file"))
+			return
+		}
+
+		tmpfile.Close()
+		source = tmpfile.Name()
+	}
+
+	importedImage, err := runtime.Import(context.Background(), source, query.Reference, query.Changes, query.Message, true)
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to import image"))
+		return
+	}
+
+	utils.WriteResponse(w, http.StatusOK, handlers.LibpodImagesImportReport{ID: importedImage})
 }
 
 func ImagesPull(w http.ResponseWriter, r *http.Request) {

pkg/api/handlers/types.go

@@ -38,8 +38,7 @@ type LibpodImagesLoadReport struct {
 }
 
 type LibpodImagesImportReport struct {
-	ID       string   `json:"id"`
-	RepoTags []string `json:"repoTags"`
+	ID string `json:"id"`
 }
 
 type LibpodImagesPullReport struct {

pkg/api/server/register_images.go

@@ -665,17 +665,23 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	// description: Import a previously exported tarball as an image.
 	// parameters:
 	//   - in: query
-	//     name: change
-	//     description: "Apply the following possible instructions to the created image (default []): CMD | ENTRYPOINT | ENV | EXPOSE | LABEL | STOPSIGNAL | USER | VOLUME | WORKDIR.  JSON encoded string"
-	//     type: string
+	//     name: changes
+	//     description: "Apply the following possible instructions to the created image: CMD | ENTRYPOINT | ENV | EXPOSE | LABEL | STOPSIGNAL | USER | VOLUME | WORKDIR.  JSON encoded string"
+	//     type: array
+	//     items:
+	//       type: string
 	//   - in: query
 	//     name: message
 	//     description: Set commit message for imported image
 	//     type: string
 	//   - in: query
+	//     name: change
+	//     description: "Optional Name[:TAG] for the image"
+	//     type: reference
+	//   - in: query
 	//     name: url
-	//     description: Specify a URL instead of a tarball
-	//     type: boolean
+	//     description: Load image from the specified URL
+	//     type: string
 	//   - in: formData
 	//     name: upload
 	//     type: file