lookupContainerID changes

gistfile1.go

diff --git a/client/service.go b/client/service.go
index e2285d7..cd085a0 100644
--- a/client/service.go
+++ b/client/service.go
@@ -8,6 +8,7 @@ import (
        "strings"
        "text/tabwriter"
 
+       "github.com/docker/docker/api/types"
        flag "github.com/docker/docker/pkg/mflag"
        "github.com/docker/docker/pkg/stringid"
 )
@@ -92,8 +93,21 @@ func lookupServiceID(cli *NetworkCli, nwName, svNameID string) (string, error) {
 }
 
 func lookupContainerID(cli *NetworkCli, cnNameID string) (string, error) {
-       // TODO : containerID to sandbox-key ?
-       return cnNameID, nil
+       // Container is a Docker resource, ask docker about it.
+       // In case of connecton error, we assume we are running in dnet and return wathever was passed to us
+       obj, _, err := readBody(cli.call("GET", fmt.Sprintf("1.19/containers/%s/json", cnNameID), nil, nil))
+       if err != nil {
+               // We are probably running outside of docker
+               return cnNameID, nil
+       }
+
+       var reply types.ContainerJSON
+       err = json.Unmarshal(obj, &reply)
+       if err != nil {
+               return "", err
+       }
+
+       return reply.Id, nil
 }
 
 // CmdService handles the service UI