Fix problems with network remove

First, make sure we are only trying to remove the network
interface if we are root.
Second, if we cannot get the interface name (e.g macvlan config)
then we should not fail. Just remove the config file.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

2 files changed, 21 insertions, 12 deletions

diff --git a/libpod/network/files.go b/libpod/network/files.go
index 846e5c62d..7f1e3ee18 100644
--- a/libpod/network/files.go
+++ b/libpod/network/files.go
@@ -14,6 +14,9 @@ import (
 	"github.com/pkg/errors"
 )
 
+// ErrNoSuchNetworkInterface indicates that no network interface exists
+var ErrNoSuchNetworkInterface = errors.New("unable to find interface name for network")
+
 // GetCNIConfDir get CNI configuration directory
 func GetCNIConfDir(configArg *config.Config) string {
 	if len(configArg.Network.NetworkConfigDir) < 1 {
@@ -142,7 +145,7 @@ func GetInterfaceNameFromConfig(path string) (string, error) {
 		}
 	}
 	if len(name) == 0 {
-		return "", errors.New("unable to find interface name for network")
+		return "", ErrNoSuchNetworkInterface
 	}
 	return name, nil
 }
diff --git a/libpod/network/network.go b/libpod/network/network.go
index 7327a1a7d..0febb52f6 100644
--- a/libpod/network/network.go
+++ b/libpod/network/network.go
@@ -10,6 +10,7 @@ import (
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/podman/v2/libpod/define"
+	"github.com/containers/podman/v2/pkg/rootless"
 	"github.com/containers/podman/v2/pkg/util"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -181,21 +182,26 @@ func RemoveNetwork(config *config.Config, name string) error {
 	// Before we delete the configuration file, we need to make sure we can read and parse
 	// it to get the network interface name so we can remove that too
 	interfaceName, err := GetInterfaceNameFromConfig(cniPath)
-	if err != nil {
-		return errors.Wrapf(err, "failed to find network interface name in %q", cniPath)
-	}
-	liveNetworkNames, err := GetLiveNetworkNames()
-	if err != nil {
-		return errors.Wrapf(err, "failed to get live network names")
-	}
-	if util.StringInSlice(interfaceName, liveNetworkNames) {
-		if err := RemoveInterface(interfaceName); err != nil {
-			return errors.Wrapf(err, "failed to delete the network interface %q", interfaceName)
+	if err == nil {
+		// Don't try to remove the network interface if we are not root
+		if !rootless.IsRootless() {
+			liveNetworkNames, err := GetLiveNetworkNames()
+			if err != nil {
+				return errors.Wrapf(err, "failed to get live network names")
+			}
+			if util.StringInSlice(interfaceName, liveNetworkNames) {
+				if err := RemoveInterface(interfaceName); err != nil {
+					return errors.Wrapf(err, "failed to delete the network interface %q", interfaceName)
+				}
+			}
 		}
+	} else if err != ErrNoSuchNetworkInterface {
+		// Don't error if we couldn't find the network interface name
+		return err
 	}
 	// Remove the configuration file
 	if err := os.Remove(cniPath); err != nil {
-		return errors.Wrapf(err, "failed to remove network configuration file %q", cniPath)
+		return errors.Wrap(err, "failed to remove network configuration")
 	}
 	return nil
 }