add network connect|disconnect compat endpoints

this enables the ability to connect and disconnect a container from a
given network. it is only for the compatibility layer. some code had to
be refactored to avoid circular imports.

additionally, tests are being deferred temporarily due to some
incompatibility/bug in either docker-py or our stack.

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

3 files changed, 52 insertions, 41 deletions

diff --git a/pkg/api/handlers/compat/networks.go b/pkg/api/handlers/compat/networks.go
index abbb6d2c0..64ddebf9c 100644
--- a/pkg/api/handlers/compat/networks.go
+++ b/pkg/api/handlers/compat/networks.go
@@ -312,48 +312,40 @@ func RemoveNetwork(w http.ResponseWriter, r *http.Request) {
 }
 
 // Connect adds a container to a network
-// TODO: For now this func is a no-op that checks the container name, network name, and
-// responds with a 200.  This allows the call to remain intact.  We need to decide how
-// we make this work with CNI networking and setup/teardown.
 func Connect(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 
-	var netConnect types.NetworkConnect
+	var (
+		aliases    []string
+		netConnect types.NetworkConnect
+	)
 	if err := json.NewDecoder(r.Body).Decode(&netConnect); err != nil {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "Decode()"))
 		return
 	}
-	config, err := runtime.GetConfig()
-	if err != nil {
-		utils.InternalServerError(w, err)
-		return
-	}
 	name := utils.GetName(r)
-	exists, err := network.Exists(config, name)
-	if err != nil {
-		utils.InternalServerError(w, err)
-		return
-	}
-	if !exists {
-		utils.Error(w, "network not found", http.StatusNotFound, define.ErrNoSuchNetwork)
-		return
+	if netConnect.EndpointConfig != nil {
+		if netConnect.EndpointConfig.Aliases != nil {
+			aliases = netConnect.EndpointConfig.Aliases
+		}
 	}
-	if _, err = runtime.LookupContainer(netConnect.Container); err != nil {
+	err := runtime.ConnectContainerToNetwork(netConnect.Container, name, aliases)
+	if err != nil {
 		if errors.Cause(err) == define.ErrNoSuchCtr {
 			utils.ContainerNotFound(w, netConnect.Container, err)
 			return
 		}
-		utils.Error(w, "unable to lookup container", http.StatusInternalServerError, err)
+		if errors.Cause(err) == define.ErrNoSuchNetwork {
+			utils.Error(w, "network not found", http.StatusNotFound, err)
+			return
+		}
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
 		return
 	}
-	logrus.Warnf("network connect endpoint is not fully implemented - tried to connect container %s to network %s", netConnect.Container, name)
 	utils.WriteResponse(w, http.StatusOK, "OK")
 }
 
 // Disconnect removes a container from a network
-// TODO: For now this func is a no-op that checks the container name, network name, and
-// responds with a 200.  This allows the call to remain intact.  We need to decide how
-// we make this work with CNI networking and setup/teardown.
 func Disconnect(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 
@@ -362,29 +354,20 @@ func Disconnect(w http.ResponseWriter, r *http.Request) {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "Decode()"))
 		return
 	}
-	config, err := runtime.GetConfig()
-	if err != nil {
-		utils.InternalServerError(w, err)
-		return
-	}
+
 	name := utils.GetName(r)
-	exists, err := network.Exists(config, name)
+	err := runtime.DisconnectContainerFromNetwork(netDisconnect.Container, name, netDisconnect.Force)
 	if err != nil {
-		utils.InternalServerError(w, err)
-		return
-	}
-	if !exists {
-		utils.Error(w, "network not found", http.StatusNotFound, define.ErrNoSuchNetwork)
-		return
-	}
-	if _, err = runtime.LookupContainer(netDisconnect.Container); err != nil {
 		if errors.Cause(err) == define.ErrNoSuchCtr {
-			utils.ContainerNotFound(w, netDisconnect.Container, err)
+			utils.Error(w, "container not found", http.StatusNotFound, err)
+			return
+		}
+		if errors.Cause(err) == define.ErrNoSuchNetwork {
+			utils.Error(w, "network not found", http.StatusNotFound, err)
 			return
 		}
-		utils.Error(w, "unable to lookup container", http.StatusInternalServerError, err)
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
 		return
 	}
-	logrus.Warnf("network disconnect endpoint is not fully implemented - tried to connect container %s to network %s", netDisconnect.Container, name)
 	utils.WriteResponse(w, http.StatusOK, "OK")
 }
diff --git a/pkg/domain/infra/abi/network.go b/pkg/domain/infra/abi/network.go
index 4f572fb88..06941f8d0 100644
--- a/pkg/domain/infra/abi/network.go
+++ b/pkg/domain/infra/abi/network.go
@@ -110,7 +110,11 @@ func (ic *ContainerEngine) NetworkRm(ctx context.Context, namesOrIds []string, o
 }
 
 func (ic *ContainerEngine) NetworkCreate(ctx context.Context, name string, options entities.NetworkCreateOptions) (*entities.NetworkCreateReport, error) {
-	return network.Create(name, options, ic.Libpod)
+	runtimeConfig, err := ic.Libpod.GetConfig()
+	if err != nil {
+		return nil, err
+	}
+	return network.Create(name, options, runtimeConfig)
 }
 
 func ifPassesFilterTest(netconf *libcni.NetworkConfigList, filter []string) bool {
diff --git a/pkg/domain/infra/runtime_libpod.go b/pkg/domain/infra/runtime_libpod.go
index 26c9c7e2e..b786a5fbf 100644
--- a/pkg/domain/infra/runtime_libpod.go
+++ b/pkg/domain/infra/runtime_libpod.go
@@ -6,8 +6,10 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"os/signal"
 	"sync"
 
+	"github.com/containers/podman/v2/cmd/podman/utils"
 	"github.com/containers/podman/v2/libpod"
 	"github.com/containers/podman/v2/pkg/cgroups"
 	"github.com/containers/podman/v2/pkg/domain/entities"
@@ -16,6 +18,7 @@ import (
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/idtools"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 	flag "github.com/spf13/pflag"
 )
 
@@ -348,3 +351,24 @@ func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []strin
 	}
 	return &options, nil
 }
+
+// StartWatcher starts a new SIGHUP go routine for the current config.
+func StartWatcher(rt *libpod.Runtime) {
+	// Setup the signal notifier
+	ch := make(chan os.Signal, 1)
+	signal.Notify(ch, utils.SIGHUP)
+
+	go func() {
+		for {
+			// Block until the signal is received
+			logrus.Debugf("waiting for SIGHUP to reload configuration")
+			<-ch
+			if err := rt.Reload(); err != nil {
+				logrus.Errorf("unable to reload configuration: %v", err)
+				continue
+			}
+		}
+	}()
+
+	logrus.Debugf("registered SIGHUP watcher for config")
+}