[FAB-2929] Docker repository tags not sanitised

Chaincode cannot be instantiated (invoked, or queried) if network ID,
peer ID or chain code name invalidate Docker's tagging rules.

Sanitised according to Dockers naming rules [a-z0-9](?:[._-][a-z0-9])*.
https://forums.docker.com/t/docker-registry-v2-spec-and-repository-naming-rule/5466

Change-Id: I15d8412cf80581126fd3d8fca0a66c9c0877853e
Signed-off-by: Nick Murray <nick@passkit.com>

core/container/dockercontroller/dockercontroller.go

@@ -25,6 +25,8 @@ import (
 
 	"bufio"
 
+	"regexp"
+
 	"github.com/fsouza/go-dockerclient"
 	container "github.com/hyperledger/fabric/core/container/api"
 	"github.com/hyperledger/fabric/core/container/ccintf"
@@ -117,7 +119,10 @@ func (vm *DockerVM) createContainer(ctxt context.Context, client *docker.Client,
 }
 
 func (vm *DockerVM) deployImage(client *docker.Client, ccid ccintf.CCID, args []string, env []string, reader io.Reader) error {
-	id, _ := vm.GetVMName(ccid)
+	id, err := vm.GetVMName(ccid)
+	if err != nil {
+		return err
+	}
 	outputbuf := bytes.NewBuffer(nil)
 	opts := docker.BuildImageOptions{
 		Name:         id,
@@ -156,7 +161,10 @@ func (vm *DockerVM) Deploy(ctxt context.Context, ccid ccintf.CCID, args []string
 
 //Start starts a container using a previously created docker image
 func (vm *DockerVM) Start(ctxt context.Context, ccid ccintf.CCID, args []string, env []string, builder container.BuildSpecFactory) error {
-	imageID, _ := vm.GetVMName(ccid)
+	imageID, err := vm.GetVMName(ccid)
+	if err != nil {
+		return err
+	}
 	client, err := cutil.NewDockerClient()
 	if err != nil {
 		dockerLogger.Debugf("start - cannot create client %s", err)
@@ -283,7 +291,10 @@ func (vm *DockerVM) Start(ctxt context.Context, ccid ccintf.CCID, args []string,
 
 //Stop stops a running chaincode
 func (vm *DockerVM) Stop(ctxt context.Context, ccid ccintf.CCID, timeout uint, dontkill bool, dontremove bool) error {
-	id, _ := vm.GetVMName(ccid)
+	id, err := vm.GetVMName(ccid)
+	if err != nil {
+		return err
+	}
 	client, err := cutil.NewDockerClient()
 	if err != nil {
 		dockerLogger.Debugf("stop - cannot create client %s", err)
@@ -324,7 +335,10 @@ func (vm *DockerVM) stopInternal(ctxt context.Context, client *docker.Client, id
 
 //Destroy destroys an image
 func (vm *DockerVM) Destroy(ctxt context.Context, ccid ccintf.CCID, force bool, noprune bool) error {
-	id, _ := vm.GetVMName(ccid)
+	id, err := vm.GetVMName(ccid)
+	if err != nil {
+		return err
+	}
 	client, err := cutil.NewDockerClient()
 	if err != nil {
 		dockerLogger.Errorf("destroy-cannot create client %s", err)
@@ -348,11 +362,29 @@ func (vm *DockerVM) Destroy(ctxt context.Context, ccid ccintf.CCID, force bool,
 func (vm *DockerVM) GetVMName(ccid ccintf.CCID) (string, error) {
 	name := ccid.GetName()
 
-	if ccid.NetworkID != "" {
-		return fmt.Sprintf("%s-%s-%s", ccid.NetworkID, ccid.PeerID, name), nil
+	//Convert to lowercase and replace any invalid characters with "-"
+	r := regexp.MustCompile("[^a-zA-Z0-9-_.]")
+
+	if ccid.NetworkID != "" && ccid.PeerID != "" {
+		name = strings.ToLower(
+			r.ReplaceAllString(
+				fmt.Sprintf("%s-%s-%s", ccid.NetworkID, ccid.PeerID, name), "-"))
+	} else if ccid.NetworkID != "" {
+		name = strings.ToLower(
+			r.ReplaceAllString(
+				fmt.Sprintf("%s-%s", ccid.NetworkID, name), "-"))
 	} else if ccid.PeerID != "" {
-		return fmt.Sprintf("%s-%s", ccid.PeerID, name), nil
-	} else {
-		return name, nil
+		name = strings.ToLower(
+			r.ReplaceAllString(
+				fmt.Sprintf("%s-%s", ccid.PeerID, name), "-"))
+	}
+
+	// Check name complies with Docker's repository naming rules
+	r = regexp.MustCompile("^[a-z0-9]+(([._-][a-z0-9]+)+)?$")
+
+	if !r.MatchString(name) {
+		dockerLogger.Errorf("Error constructing Docker VM Name. '%s' breaks Docker's repository naming rules", name)
+		return name, fmt.Errorf("Error constructing Docker VM Name. '%s' breaks Docker's repository naming rules", name)
 	}
+	return name, nil
 }