add compatibility endpoint for exporting multiple images

with the recent inclusion of dealing with multiple images in a tar archive, we can now add a compatibility endpoint that was missing images/get?names=one,two.

Fixes: #7950

Signed-off-by: baude <bbaude@redhat.com>

pkg/api/handlers/compat/images.go

@@ -55,6 +55,7 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
 		return
 	}
+	defer os.Remove(tmpfile.Name())
 	if err := tmpfile.Close(); err != nil {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
 		return
@@ -69,7 +70,6 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	defer rdr.Close()
-	defer os.Remove(tmpfile.Name())
 	utils.WriteResponse(w, http.StatusOK, rdr)
 }
 
@@ -398,3 +398,43 @@ func LoadImages(w http.ResponseWriter, r *http.Request) {
 		Stream: fmt.Sprintf("Loaded image: %s\n", id),
 	})
 }
+
+func ExportImages(w http.ResponseWriter, r *http.Request) {
+	// 200 OK
+	// 500 Error
+	decoder := r.Context().Value("decoder").(*schema.Decoder)
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+
+	query := struct {
+		Names string `schema:"names"`
+	}{
+		// This is where you can override the golang default value for one of fields
+	}
+	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
+		return
+	}
+	images := make([]string, 0)
+	images = append(images, strings.Split(query.Names, ",")...)
+	tmpfile, err := ioutil.TempFile("", "api.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())
+	if err := tmpfile.Close(); err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
+		return
+	}
+	if err := runtime.ImageRuntime().SaveImages(r.Context(), images, "docker-archive", tmpfile.Name(), false); err != nil {
+		utils.InternalServerError(w, err)
+		return
+	}
+	rdr, err := os.Open(tmpfile.Name())
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "failed to read the exported tarfile"))
+		return
+	}
+	defer rdr.Close()
+	utils.WriteResponse(w, http.StatusOK, rdr)
+}

pkg/api/server/register_images.go

@@ -275,6 +275,31 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	r.Handle(VersionedPath("/images/{name:.*}/get"), s.APIHandler(compat.ExportImage)).Methods(http.MethodGet)
 	// Added non version path to URI to support docker non versioned paths
 	r.Handle("/images/{name:.*}/get", s.APIHandler(compat.ExportImage)).Methods(http.MethodGet)
+	// swagger:operation GET /images/get compat get
+	// ---
+	// tags:
+	//  - images (compat)
+	// summary: Export several images
+	// description: Get a tarball containing all images and metadata for several image repositories
+	// parameters:
+	//  - in:  query
+	//    name:  names
+	//    type: string
+	//    required: true
+	//    description: one or more image names or IDs comma separated
+	// produces:
+	//  - application/json
+	// responses:
+	//   200:
+	//     description: no error
+	//     schema:
+	//      type: string
+	//      format: binary
+	//   500:
+	//     $ref: '#/responses/InternalError'
+	r.Handle(VersionedPath("/images/get"), s.APIHandler(compat.ExportImages)).Methods(http.MethodGet)
+	// Added non version path to URI to support docker non versioned paths
+	r.Handle("/images/get", s.APIHandler(compat.ExportImages)).Methods(http.MethodGet)
 	// swagger:operation GET /images/{name:.*}/history compat imageHistory
 	// ---
 	// tags:

test/apiv2/10-images.at

@@ -68,4 +68,7 @@ for i in $iid ${iid:0:12} $PODMAN_TEST_IMAGE_NAME; do
   t GET "libpod/images/$i/get?compress=false" 200 '[POSIX tar archive]'
 done
 
+# Export more than one image
+t GET images/get?names=alpine,busybox 200 '[POSIX tar archive]'
+
 # vim: filetype=sh