Add APIv2 handler for resizing exec sessions

Signed-off-by: Matthew Heon <mheon@redhat.com>

pkg/api/handlers/compat/exec.go

@@ -14,6 +14,7 @@ import (
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"k8s.io/client-go/tools/remotecommand"
 )
 
 // ExecCreateHandler creates an exec session for a given container.
@@ -107,6 +108,45 @@ func ExecInspectHandler(w http.ResponseWriter, r *http.Request) {
 	utils.WriteResponse(w, http.StatusOK, inspectOut)
 }
 
+// ExecResizeHandler resizes a given exec session's TTY.
+func ExecResizeHandler(w http.ResponseWriter, r *http.Request) {
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+	decoder := r.Context().Value("decoder").(*schema.Decoder)
+
+	sessionID := mux.Vars(r)["id"]
+
+	query := struct {
+		Height uint16 `schema:"h"`
+		Width  uint16 `schema:"w"`
+	}{
+		// override any golang type defaults
+	}
+	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
+	}
+
+	sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
+	if err != nil {
+		utils.Error(w, fmt.Sprintf("No such exec session: %s", sessionID), http.StatusNotFound, err)
+		return
+	}
+
+	newSize := remotecommand.TerminalSize{
+		Width:  query.Width,
+		Height: query.Height,
+	}
+
+	if err := sessionCtr.ExecResize(sessionID, newSize); err != nil {
+		utils.InternalServerError(w, err)
+		return
+	}
+
+	// This is a 201 some reason, not a 204.
+	utils.WriteResponse(w, http.StatusCreated, "")
+}
+
 // ExecStartHandler runs a given exec session.
 func ExecStartHandler(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)

pkg/api/server/register_exec.go

@@ -114,7 +114,7 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//     $ref: "#/responses/InternalError"
 	r.Handle(VersionedPath("/exec/{id}/start"), s.APIHandler(compat.ExecStartHandler)).Methods(http.MethodPost)
 	// Added non version path to URI to support docker non versioned paths
-	r.Handle("/exec/{id}/start", s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle("/exec/{id}/start", s.APIHandler(compat.ExecStartHandler)).Methods(http.MethodPost)
 	// swagger:operation POST /exec/{id}/resize compat resizeExec
 	// ---
 	// tags:
@@ -145,9 +145,9 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//     $ref: "#/responses/NoSuchExecInstance"
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/exec/{id}/resize"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle(VersionedPath("/exec/{id}/resize"), s.APIHandler(compat.ExecResizeHandler)).Methods(http.MethodPost)
 	// Added non version path to URI to support docker non versioned paths
-	r.Handle("/exec/{id}/resize", s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle("/exec/{id}/resize", s.APIHandler(compat.ExecResizeHandler)).Methods(http.MethodPost)
 	// swagger:operation GET /exec/{id}/json compat inspectExec
 	// ---
 	// tags:
@@ -264,10 +264,10 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//      properties:
 	//        Detach:
 	//          type: boolean
-	//          description: Detach from the command
+	//          description: Detach from the command. Not presently supported.
 	//        Tty:
 	//          type: boolean
-	//          description: Allocate a pseudo-TTY
+	//          description: Allocate a pseudo-TTY. Not presently supported.
 	// produces:
 	// - application/json
 	// responses:
@@ -276,10 +276,10 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//   404:
 	//     $ref: "#/responses/NoSuchExecInstance"
 	//   409:
-	//	   description: container is stopped or paused
+	//	   description: container is not running.
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/libpod/exec/{id}/start"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle(VersionedPath("/libpod/exec/{id}/start"), s.APIHandler(compat.ExecStartHandler)).Methods(http.MethodPost)
 	// swagger:operation POST /libpod/exec/{id}/resize libpod libpodResizeExec
 	// ---
 	// tags:
@@ -310,7 +310,7 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//     $ref: "#/responses/NoSuchExecInstance"
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/libpod/exec/{id}/resize"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle(VersionedPath("/libpod/exec/{id}/resize"), s.APIHandler(compat.ExecResizeHandler)).Methods(http.MethodPost)
 	// swagger:operation GET /libpod/exec/{id}/json libpod libpodInspectExec
 	// ---
 	// tags: