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package network
import (
"fmt"
"os"
"syscall"
"github.com/dotcloud/docker/pkg/libcontainer"
"github.com/dotcloud/docker/pkg/system"
)
// crosbymichael: could make a network strategy that instead of returning veth pair names it returns a pid to an existing network namespace
type NetNS struct {
}
func (v *NetNS) Create(n *libcontainer.Network, nspid int, context libcontainer.Context) error {
context["nspath"] = n.Context["nspath"]
return nil
}
func (v *NetNS) Initialize(config *libcontainer.Network, context libcontainer.Context) error {
nspath, exists := context["nspath"]
if !exists {
return fmt.Errorf("nspath does not exist in network context")
}
f, err := os.OpenFile(nspath, os.O_RDONLY, 0)
if err != nil {
return fmt.Errorf("failed get network namespace fd: %v", err)
}
if err := system.Setns(f.Fd(), syscall.CLONE_NEWNET); err != nil {
return fmt.Errorf("failed to setns current network namespace: %v", err)
}
return nil
}
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