kyaml: add Network to ContainerFilter

kyaml/kio/filters/container.go

@@ -15,7 +15,7 @@ import (
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
-// GrepFilter filters Resources using a container image.
+// ContainerFilter filters Resources using a container image.
 // The container must start a process that reads the list of
 // input Resources from stdin, reads the Configuration from the env
 // API_CONFIG, and writes the filtered Resources to stdout.
@@ -27,6 +27,9 @@ type ContainerFilter struct {
 	// Image is the container image to use to create a container.
 	Image string `yaml:"image,omitempty"`
 
+	// Network is the container network to use.
+	Network string `yaml:"network,omitempty"`
+
 	// Config is the API configuration for the container and passed through the
 	// API_CONFIG env var to the container.
 	// Typically a Kubernetes style Resource Config.
@@ -79,12 +82,18 @@ func (c *ContainerFilter) getArgs() []string {
 	// run the container using docker.  this is simpler than using the docker
 	// libraries, and ensures things like auth work the same as if the container
 	// was run from the cli.
+
+	network := "none"
+	if c.Network != "" {
+		network = c.Network
+	}
+
 	args := []string{"docker", "run",
 		"--rm",                                              // delete the container afterward
 		"-i", "-a", "STDIN", "-a", "STDOUT", "-a", "STDERR", // attach stdin, stdout, stderr
 
 		// added security options
-		"--network", "none", // disable the network
+		"--network", network,
 		"--user", "nobody", // run as nobody
 		// don't make fs readonly because things like heredoc rely on writing tmp files
 		"--security-opt=no-new-privileges", // don't allow the user to escalate privileges

kyaml/kio/filters/container_test.go

@@ -60,6 +60,41 @@ metadata:
 	assert.True(t, foundKyaml)
 }
 
+func TestFilter_command_network(t *testing.T) {
+	cfg, err := yaml.Parse(`apiversion: apps/v1
+kind: Deployment
+metadata:
+  name: foo
+`)
+	if !assert.NoError(t, err) {
+		return
+	}
+	instance := &ContainerFilter{
+		Image:  "example.com:version",
+		Network: "test-net",
+		Config: cfg,
+	}
+	cmd, err := instance.getCommand()
+	if !assert.NoError(t, err) {
+		return
+	}
+
+	expected := []string{
+		"docker", "run",
+		"--rm",
+		"-i", "-a", "STDIN", "-a", "STDOUT", "-a", "STDERR",
+		"--network", "test-net",
+		"--user", "nobody",
+		"--security-opt=no-new-privileges",
+	}
+	for _, e := range os.Environ() {
+		// the process env
+		expected = append(expected, "-e", strings.Split(e, "=")[0])
+	}
+	expected = append(expected, "example.com:version")
+	assert.Equal(t, expected, cmd.Args)
+}
+
 func TestFilter_Filter(t *testing.T) {
 	cfg, err := yaml.Parse(`apiVersion: apps/v1
 kind: Deployment