v2 api: /libpod/images/load

Implement the /libpod/images/load 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>

go.sum

@@ -44,6 +44,7 @@ github.com/buger/jsonparser v0.0.0-20180808090653-f4dd9f5a6b44/go.mod h1:bbYlZJ7
 github.com/checkpoint-restore/go-criu v0.0.0-20190109184317-bdb7599cd87b h1:T4nWG1TXIxeor8mAu5bFguPJgSIGhZqv/f0z55KCrJM=
 github.com/checkpoint-restore/go-criu v0.0.0-20190109184317-bdb7599cd87b/go.mod h1:TrMrLQfeENAPYPRsJuq3jsqdlRh3lvi6trTZJG8+tho=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd h1:qMd81Ts1T2OTKmB4acZcyKaMtRnY5Y44NuXGX2GFJ1w=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/containerd/cgroups v0.0.0-20190919134610-bf292b21730f h1:tSNMc+rJDfmYntojat8lljbt1mgKNpTxUZJsSzJ9Y1s=
 github.com/containerd/cgroups v0.0.0-20190919134610-bf292b21730f/go.mod h1:OApqhQ4XNSNC13gXIwDjhOQxjWa/NxkwZXJ1EvqT0ko=
@@ -194,6 +195,7 @@ github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/google/btree v0.0.0-20160524151835-7d79101e329e/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/gofuzz v0.0.0-20161122191042-44d81051d367/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
 github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=

pkg/api/handlers/libpod/images.go

@@ -3,6 +3,7 @@ package libpod
 import (
 	"context"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"net/http"
 	"os"
@@ -183,8 +184,41 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 }
 
 func ImagesLoad(w http.ResponseWriter, r *http.Request) {
-	//TODO ...
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
-	utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.New("/libpod/images/load is not yet implemented"))
+	decoder := r.Context().Value("decoder").(*schema.Decoder)
+	query := struct {
+		Reference string `schema:"reference"`
+	}{
+		// 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
+	}
+
+	tmpfile, err := ioutil.TempFile("", "libpod-images-load.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()
+	loadedImage, err := runtime.LoadImage(context.Background(), query.Reference, tmpfile.Name(), os.Stderr, "")
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to load image"))
+		return
+	}
+
+	utils.WriteResponse(w, http.StatusOK, []handlers.LibpodImagesLoadReport{{ID: loadedImage}})
 }
 
 func ImagesImport(w http.ResponseWriter, r *http.Request) {

pkg/api/handlers/types.go

@@ -35,7 +35,6 @@ type ContainerConfig struct {
 
 type LibpodImagesLoadReport struct {
 	ID string `json:"id"`
-	RepoTags []string `json:"repoTags"`
 }
 
 type LibpodImagesImportReport struct {

pkg/api/server/register_images.go

@@ -640,12 +640,8 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	// 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"
+	//     description: "Optional Name[:TAG] for the image"
-	//     type: string
+	//     type: reference
-	//   - in: query
-	//     name: message
-	//     description: Set commit message for imported image
-	//     type: string
 	//   - in: formData
 	//     name: upload
 	//     description: tarball of container image
@@ -656,6 +652,8 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	// responses:
 	//   200:
 	//     $ref: "#/responses/DocsLibpodImagesLoadResponse"
+	//   400:
+	//     $ref: "#/responses/BadParamError"
 	//   500:
 	//     $ref: '#/responses/InternalError'
 	r.Handle(VersionedPath("/libpod/images/load"), APIHandler(s.Context, libpod.ImagesLoad)).Methods(http.MethodPost)
@@ -688,6 +686,8 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	// responses:
 	//   200:
 	//     $ref: "#/responses/DocsLibpodImagesImportResponse"
+	//   400:
+	//     $ref: "#/responses/BadParamError"
 	//   500:
 	//     $ref: '#/responses/InternalError'
 	r.Handle(VersionedPath("/libpod/images/import"), APIHandler(s.Context, libpod.ImagesImport)).Methods(http.MethodPost)