API returns 500 in case network is not found instead of 404

libpod/define/errors.go

@@ -2,6 +2,10 @@ package define
 
 import (
 	"errors"
+
+	"github.com/containers/podman/v2/libpod/image"
+	"github.com/containers/podman/v2/pkg/network"
+	"github.com/containers/podman/v2/utils"
 )
 
 var (
@@ -20,6 +24,9 @@ var (
 	// ErrNoSuchVolume indicates the requested volume does not exist
 	ErrNoSuchVolume = errors.New("no such volume")
 
+	// ErrNoSuchNetwork indicates the requested network does not exist
+	ErrNoSuchNetwork = network.ErrNetworkNotFound
+
 	// ErrNoSuchExecSession indicates that the requested exec session does
 	// not exist.
 	ErrNoSuchExecSession = errors.New("no such exec session")

pkg/api/handlers/compat/networks.go

@@ -44,9 +44,7 @@ func InspectNetwork(w http.ResponseWriter, r *http.Request) {
 	name := utils.GetName(r)
 	_, err = network.InspectNetwork(config, name)
 	if err != nil {
-		// TODO our network package does not distinguish between not finding a
-		// specific network vs not being able to read it
-		utils.InternalServerError(w, err)
+		utils.NetworkNotFound(w, name, err)
 		return
 	}
 	report, err := getNetworkResourceByName(name, runtime)

pkg/api/handlers/utils/errors.go

@@ -39,6 +39,7 @@ func VolumeNotFound(w http.ResponseWriter, name string, err error) {
 	msg := fmt.Sprintf("No such volume: %s", name)
 	Error(w, msg, http.StatusNotFound, err)
 }
+
 func ContainerNotFound(w http.ResponseWriter, name string, err error) {
 	if errors.Cause(err) != define.ErrNoSuchCtr {
 		InternalServerError(w, err)
@@ -55,6 +56,14 @@ func ImageNotFound(w http.ResponseWriter, name string, err error) {
 	Error(w, msg, http.StatusNotFound, err)
 }
 
+func NetworkNotFound(w http.ResponseWriter, name string, err error) {
+	if errors.Cause(err) != define.ErrNoSuchNetwork {
+		InternalServerError(w, err)
+	}
+	msg := fmt.Sprintf("No such network: %s", name)
+	Error(w, msg, http.StatusNotFound, err)
+}
+
 func PodNotFound(w http.ResponseWriter, name string, err error) {
 	if errors.Cause(err) != define.ErrNoSuchPod {
 		InternalServerError(w, err)

test/apiv2/35-networks.at

@@ -0,0 +1,8 @@
+# -*- sh -*-
+#
+# network-related tests
+#
+
+t GET /networks/non-existing-network 404
+
+# vim: filetype=sh