use libnetwork from c/common

The libpod/network packages were moved to c/common so that buildah can
use it as well. To prevent duplication use it in podman as well and
remove it from here.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

vendor/github.com/containers/common/libnetwork/netavark/run.go

@@ -0,0 +1,127 @@
+// +build linux
+
+package netavark
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/containers/common/libnetwork/internal/util"
+	"github.com/containers/common/libnetwork/types"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+type netavarkOptions struct {
+	types.NetworkOptions
+	Networks map[string]*types.Network `json:"network_info"`
+}
+
+// Setup will setup the container network namespace. It returns
+// a map of StatusBlocks, the key is the network name.
+func (n *netavarkNetwork) Setup(namespacePath string, options types.SetupOptions) (map[string]types.StatusBlock, error) {
+	n.lock.Lock()
+	defer n.lock.Unlock()
+	err := n.loadNetworks()
+	if err != nil {
+		return nil, err
+	}
+
+	err = util.ValidateSetupOptions(n, namespacePath, options)
+	if err != nil {
+		return nil, err
+	}
+
+	// allocate IPs in the IPAM db
+	err = n.allocIPs(&options.NetworkOptions)
+	if err != nil {
+		return nil, err
+	}
+
+	netavarkOpts, err := n.convertNetOpts(options.NetworkOptions)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to convert net opts")
+	}
+
+	// trace output to get the json
+	if logrus.IsLevelEnabled(logrus.TraceLevel) {
+		b, err := json.Marshal(&netavarkOpts)
+		if err != nil {
+			return nil, err
+		}
+		// show the full netavark command so we can easily reproduce errors from the cli
+		logrus.Tracef("netavark command: printf '%s' | %s setup %s", string(b), n.netavarkBinary, namespacePath)
+	}
+
+	result := map[string]types.StatusBlock{}
+	err = n.execNetavark([]string{"setup", namespacePath}, netavarkOpts, &result)
+	if err != nil {
+		// lets dealloc ips to prevent leaking
+		if err := n.deallocIPs(&options.NetworkOptions); err != nil {
+			logrus.Error(err)
+		}
+		return nil, err
+	}
+
+	// make sure that the result makes sense
+	if len(result) != len(options.Networks) {
+		logrus.Errorf("unexpected netavark result: %v", result)
+		return nil, fmt.Errorf("unexpected netavark result length, want (%d), got (%d) networks", len(options.Networks), len(result))
+	}
+
+	return result, err
+}
+
+// Teardown will teardown the container network namespace.
+func (n *netavarkNetwork) Teardown(namespacePath string, options types.TeardownOptions) error {
+	n.lock.Lock()
+	defer n.lock.Unlock()
+	err := n.loadNetworks()
+	if err != nil {
+		return err
+	}
+
+	// get IPs from the IPAM db
+	err = n.getAssignedIPs(&options.NetworkOptions)
+	if err != nil {
+		// when there is an error getting the ips we should still continue
+		// to call teardown for netavark to prevent leaking network interfaces
+		logrus.Error(err)
+	}
+
+	netavarkOpts, err := n.convertNetOpts(options.NetworkOptions)
+	if err != nil {
+		return errors.Wrap(err, "failed to convert net opts")
+	}
+
+	retErr := n.execNetavark([]string{"teardown", namespacePath}, netavarkOpts, nil)
+
+	// when netavark returned an error we still free the used ips
+	// otherwise we could end up in a state where block the ips forever
+	err = n.deallocIPs(&netavarkOpts.NetworkOptions)
+	if err != nil {
+		if retErr != nil {
+			logrus.Error(err)
+		} else {
+			retErr = err
+		}
+	}
+
+	return retErr
+}
+
+func (n *netavarkNetwork) convertNetOpts(opts types.NetworkOptions) (*netavarkOptions, error) {
+	netavarkOptions := netavarkOptions{
+		NetworkOptions: opts,
+		Networks:       make(map[string]*types.Network, len(opts.Networks)),
+	}
+
+	for network := range opts.Networks {
+		net, err := n.getNetwork(network)
+		if err != nil {
+			return nil, err
+		}
+		netavarkOptions.Networks[network] = net
+	}
+	return &netavarkOptions, nil
+}