Add --label flag when running an application

This will add the given labels to all the containers inside the
application (except for the invocation image). The labels are passed
over by file, this is to be able to easely add new parameters in the
future and limit the explosion of parameters we have in our bundle

Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>

Author: rumpl

cmd/cnab-run/install.go

@@ -51,7 +51,11 @@ func installAction(instanceName string) error {
 	if err != nil {
 		return err
 	}
+	if err = addLabels(rendered); err != nil {
+		return err
+	}
 	addAppLabels(rendered, instanceName)
+
 	if err := os.Chdir(app.Path); err != nil {
 		return err
 	}
@@ -87,6 +91,28 @@ func getBundleImageMap() (map[string]bundle.Image, error) {
 	return result, nil
 }
 
+func addLabels(rendered *composetypes.Config) error {
+	args, err := ioutil.ReadFile(internal.DockerArgsPath)
+	if err != nil {
+		return err
+	}
+	a := packager.DockerAppArgs{}
+	err = json.Unmarshal(args, &a)
+	if err != nil {
+		return err
+	}
+	for k, v := range a.Labels {
+		for i, service := range rendered.Services {
+			if service.Labels == nil {
+				service.Labels = map[string]string{}
+			}
+			service.Labels[k] = v
+			rendered.Services[i] = service
+		}
+	}
+	return nil
+}
+
 func addAppLabels(rendered *composetypes.Config, instanceName string) {
 	for i, service := range rendered.Services {
 		if service.Labels == nil {

internal/commands/image/list.go

@@ -107,7 +107,7 @@ func printImageIDs(dockerCli command.Cli, refs []pkg) error {
 		}
 		fmt.Fprintln(&buf, stringid.TruncateID(id.String()))
 	}
-	fmt.Fprintf(dockerCli.Out(), buf.String())
+	fmt.Fprint(dockerCli.Out(), buf.String())
 	return nil
 }
 

internal/commands/image/list_test.go

@@ -14,12 +14,6 @@ import (
 	"github.com/docker/distribution/reference"
 )
 
-type mockRef string
-
-func (ref mockRef) String() string {
-	return string(ref)
-}
-
 type bundleStoreStubForListCmd struct {
 	refMap map[reference.Reference]*bundle.Bundle
 	// in order to keep the reference in the same order between tests

internal/commands/parameters.go

@@ -1,13 +1,15 @@
 package commands
 
 import (
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
 	"strings"
 
 	"github.com/deislabs/cnab-go/bundle"
 	"github.com/docker/app/internal"
+	"github.com/docker/app/internal/packager"
 	"github.com/docker/app/internal/store"
 	"github.com/docker/app/types/parameters"
 	cliopts "github.com/docker/cli/opts"
@@ -45,6 +47,22 @@ func withCommandLineParameters(overrides []string) mergeBundleOpt {
 	}
 }
 
+func withLabels(labels []string) mergeBundleOpt {
+	return func(c *mergeBundleConfig) error {
+		l := packager.DockerAppArgs{
+			Labels: cliopts.ConvertKVStringsToMap(labels),
+		}
+		out, err := json.Marshal(l)
+		if err != nil {
+			return err
+		}
+		if _, ok := c.bundle.Parameters[internal.ParameterArgs]; ok {
+			c.params[internal.ParameterArgs] = string(out)
+		}
+		return nil
+	}
+}
+
 func withSendRegistryAuth(sendRegistryAuth bool) mergeBundleOpt {
 	return func(c *mergeBundleConfig) error {
 		if _, ok := c.bundle.Definitions[internal.ParameterShareRegistryCredsName]; ok {

internal/commands/run.go

@@ -25,6 +25,7 @@ type runOptions struct {
 	kubeNamespace string
 	stackName     string
 	cnabBundle    string
+	labels        []string
 }
 
 const longDescription = `Run an App from an App image.`
@@ -59,10 +60,11 @@ func runCmd(dockerCli command.Cli) *cobra.Command {
 	}
 	opts.parametersOptions.addFlags(cmd.Flags())
 	opts.credentialOptions.addFlags(cmd.Flags())
-	cmd.Flags().StringVar(&opts.orchestrator, "orchestrator", "", "Orchestrator to run on (swarm, kubernetes)")
-	cmd.Flags().StringVar(&opts.kubeNamespace, "namespace", "default", "Kubernetes namespace in which to run the App")
-	cmd.Flags().StringVar(&opts.stackName, "name", "", "Name of the running App")
-	cmd.Flags().StringVar(&opts.cnabBundle, "cnab-bundle-json", "", "Run a CNAB bundle instead of a Docker App image")
+	cmd.Flags().StringVar(&opts.orchestrator, "orchestrator", "", "Orchestrator to install on (swarm, kubernetes)")
+	cmd.Flags().StringVar(&opts.kubeNamespace, "namespace", "default", "Kubernetes namespace to install into")
+	cmd.Flags().StringVar(&opts.stackName, "name", "", "Assign a name to the installation")
+	cmd.Flags().StringVar(&opts.cnabBundle, "cnab-bundle-json", "", "Run a CNAB bundle instead of a Docker App")
+	cmd.Flags().StringArrayVar(&opts.labels, "label", nil, "Label to add to services")
 
 	return cmd
 }
@@ -130,6 +132,7 @@ func runBundle(dockerCli command.Cli, bndl *bundle.Bundle, opts runOptions, ref
 	if err := mergeBundleParameters(installation,
 		withFileParameters(opts.parametersFiles),
 		withCommandLineParameters(opts.overrides),
+		withLabels(opts.labels),
 		withOrchestratorParameters(opts.orchestrator, opts.kubeNamespace),
 		withSendRegistryAuth(opts.sendRegistryAuth),
 	); err != nil {

internal/names.go

@@ -52,6 +52,8 @@ const (
 	ParameterRenderFormatName = Namespace + "render-format"
 	// ParameterInspectFormatName is the name of the parameter containing the inspect format
 	ParameterInspectFormatName = Namespace + "inspect-format"
+	// ParameterArgs is the name of the parameter containing labels to be applied to service containers
+	ParameterArgs = Namespace + "args"
 	// ParameterShareRegistryCredsName is the name of the parameter which indicates if credentials should be shared
 	ParameterShareRegistryCredsName = Namespace + "share-registry-creds"
 
@@ -68,6 +70,8 @@ const (
 	// the inspect output format.
 	DockerInspectFormatEnvVar = "DOCKER_INSPECT_FORMAT"
 
+	DockerArgsPath = "/cnab/app/args.json"
+
 	// CustomDockerAppName is the custom variable set by Docker App to
 	// save custom informations
 	CustomDockerAppName = "com.docker.app"

internal/packager/cnab.go

@@ -23,11 +23,24 @@ type DockerAppCustom struct {
 	Payload json.RawMessage `json:"payload,omitempty"`
 }
 
+// DockerAppArgs represent the object passed to the invocation image
+// by Docker App.
+type DockerAppArgs struct {
+	// Labels are the labels to add to containers on run
+	Labels map[string]string `json:"labels,omitempty"`
+}
+
 // ToCNAB creates a CNAB bundle from an app package
 func ToCNAB(app *types.App, invocationImageName string) (*bundle.Bundle, error) {
 	mapping := ExtractCNABParameterMapping(app.Parameters())
 	flatParameters := app.Parameters().Flatten()
 	definitions := definition.Definitions{
+		internal.ParameterArgs: {
+			Type:        "string",
+			Default:     "",
+			Title:       "Labels",
+			Description: "Labels to apply to service containers",
+		},
 		internal.ParameterOrchestratorName: {
 			Type: "string",
 			Enum: []interface{}{
@@ -73,6 +86,16 @@ func ToCNAB(app *types.App, invocationImageName string) (*bundle.Bundle, error)
 		},
 	}
 	parameters := map[string]bundle.Parameter{
+		internal.ParameterArgs: {
+			Destination: &bundle.Location{
+				Path: internal.DockerArgsPath,
+			},
+			ApplyTo: []string{
+				"install",
+				"upgrade",
+			},
+			Definition: internal.ParameterArgs,
+		},
 		internal.ParameterOrchestratorName: {
 			Destination: &bundle.Location{
 				EnvironmentVariable: internal.DockerStackOrchestratorEnvVar,