Support env variables based on ConfigMaps sent in payload

Fixes #12363

Signed-off-by: Jakub Dzon <jdzon@redhat.com>

docs/source/markdown/podman-play-kube.1.md

@@ -16,6 +16,7 @@ Currently, the supported Kubernetes kinds are:
 - Pod
 - Deployment
 - PersistentVolumeClaim
+- ConfigMap
 
 `Kubernetes Pods or Deployments`
 
@@ -68,6 +69,40 @@ like:
 The build will consider `foobar` to be the context directory for the build. If there is an image in local storage
 called `foobar`, the image will not be built unless the `--build` flag is used.
 
+`Kubernetes ConfigMap`
+
+Kubernetes ConfigMap can be referred as a source of environment variables in Pods or Deployments.
+
+For example ConfigMap defined in following YAML:
+```
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: foo
+data:
+    FOO: bar
+```
+
+can be referred in a Pod in following way:
+```
+apiVersion: v1
+kind: Pod
+metadata:
+...
+spec:
+  containers:
+  - command:
+    - top
+    name: container-1
+    image: foobar
+    envFrom:
+      - configMapRef:
+      name: foo
+      optional: false
+```
+
+and as a result environment variable `FOO` will be set to `bar` for container `container-1`.
+
 ## OPTIONS
 
 #### **--authfile**=*path*

pkg/domain/infra/abi/play.go

@@ -57,6 +57,8 @@ func (ic *ContainerEngine) PlayKube(ctx context.Context, path string, options en
 
 	ipIndex := 0
 
+	var configMaps []v1.ConfigMap
+
 	// create pod on each document if it is a pod or deployment
 	// any other kube kind will be skipped
 	for _, document := range documentList {
@@ -77,7 +79,7 @@ func (ic *ContainerEngine) PlayKube(ctx context.Context, path string, options en
 			podTemplateSpec.ObjectMeta = podYAML.ObjectMeta
 			podTemplateSpec.Spec = podYAML.Spec
 
-			r, err := ic.playKubePod(ctx, podTemplateSpec.ObjectMeta.Name, &podTemplateSpec, options, &ipIndex, podYAML.Annotations)
+			r, err := ic.playKubePod(ctx, podTemplateSpec.ObjectMeta.Name, &podTemplateSpec, options, &ipIndex, podYAML.Annotations, configMaps)
 			if err != nil {
 				return nil, err
 			}
@@ -91,7 +93,7 @@ func (ic *ContainerEngine) PlayKube(ctx context.Context, path string, options en
 				return nil, errors.Wrapf(err, "unable to read YAML %q as Kube Deployment", path)
 			}
 
-			r, err := ic.playKubeDeployment(ctx, &deploymentYAML, options, &ipIndex)
+			r, err := ic.playKubeDeployment(ctx, &deploymentYAML, options, &ipIndex, configMaps)
 			if err != nil {
 				return nil, err
 			}
@@ -112,6 +114,13 @@ func (ic *ContainerEngine) PlayKube(ctx context.Context, path string, options en
 
 			report.Volumes = append(report.Volumes, r.Volumes...)
 			validKinds++
+		case "ConfigMap":
+			var configMap v1.ConfigMap
+
+			if err := yaml.Unmarshal(document, &configMap); err != nil {
+				return nil, errors.Wrapf(err, "unable to read YAML %q as Kube ConfigMap", path)
+			}
+			configMaps = append(configMaps, configMap)
 		default:
 			logrus.Infof("Kube kind %s not supported", kind)
 			continue
@@ -125,7 +134,7 @@ func (ic *ContainerEngine) PlayKube(ctx context.Context, path string, options en
 	return report, nil
 }
 
-func (ic *ContainerEngine) playKubeDeployment(ctx context.Context, deploymentYAML *v1apps.Deployment, options entities.PlayKubeOptions, ipIndex *int) (*entities.PlayKubeReport, error) {
+func (ic *ContainerEngine) playKubeDeployment(ctx context.Context, deploymentYAML *v1apps.Deployment, options entities.PlayKubeOptions, ipIndex *int, configMaps []v1.ConfigMap) (*entities.PlayKubeReport, error) {
 	var (
 		deploymentName string
 		podSpec        v1.PodTemplateSpec
@@ -147,7 +156,7 @@ func (ic *ContainerEngine) playKubeDeployment(ctx context.Context, deploymentYAM
 	// create "replicas" number of pods
 	for i = 0; i < numReplicas; i++ {
 		podName := fmt.Sprintf("%s-pod-%d", deploymentName, i)
-		podReport, err := ic.playKubePod(ctx, podName, &podSpec, options, ipIndex, deploymentYAML.Annotations)
+		podReport, err := ic.playKubePod(ctx, podName, &podSpec, options, ipIndex, deploymentYAML.Annotations, configMaps)
 		if err != nil {
 			return nil, errors.Wrapf(err, "error encountered while bringing up pod %s", podName)
 		}
@@ -156,7 +165,7 @@ func (ic *ContainerEngine) playKubeDeployment(ctx context.Context, deploymentYAM
 	return &report, nil
 }
 
-func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podYAML *v1.PodTemplateSpec, options entities.PlayKubeOptions, ipIndex *int, annotations map[string]string) (*entities.PlayKubeReport, error) {
+func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podYAML *v1.PodTemplateSpec, options entities.PlayKubeOptions, ipIndex *int, annotations map[string]string, configMaps []v1.ConfigMap) (*entities.PlayKubeReport, error) {
 	var (
 		writer      io.Writer
 		playKubePod entities.PlayKubePod
@@ -252,7 +261,10 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
 		ctrRestartPolicy = define.RestartPolicyAlways
 	}
 
-	configMaps := []v1.ConfigMap{}
+	configMapIndex := make(map[string]struct{})
+	for _, configMap := range configMaps {
+		configMapIndex[configMap.Name] = struct{}{}
+	}
 	for _, p := range options.ConfigMaps {
 		f, err := os.Open(p)
 		if err != nil {
@@ -265,6 +277,10 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
 			return nil, errors.Wrapf(err, "%q", p)
 		}
 
+		if _, present := configMapIndex[cm.Name]; present {
+			return nil, errors.Errorf("ambiguous configuration: the same config map %s is present in YAML and in --configmaps %s file", cm.Name, p)
+		}
+
 		configMaps = append(configMaps, cm)
 	}
 

test/e2e/play_kube_test.go

@@ -2,8 +2,13 @@ package integration
 
 import (
 	"bytes"
+	"context"
 	"fmt"
+	"github.com/containers/podman/v3/pkg/bindings"
+	"github.com/containers/podman/v3/pkg/bindings/play"
 	"io/ioutil"
+	"net"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -436,6 +441,41 @@ spec:
         {{ end }}
         env:
         - name: HOSTNAME
+        {{ range .Env }}
+        - name: {{ .Name }}
+        {{ if (eq .ValueFrom "configmap") }}
+          valueFrom:
+            configMapKeyRef:
+              name: {{ .RefName }}
+              key: {{ .RefKey }}
+              optional: {{ .Optional }}
+        {{ end }}
+        {{ if (eq .ValueFrom "secret") }}
+          valueFrom:
+            secretKeyRef:
+              name: {{ .RefName }}
+              key: {{ .RefKey }}
+              optional: {{ .Optional }}
+        {{ end }}
+        {{ if (eq .ValueFrom "") }}
+          value: {{ .Value }}
+        {{ end }}
+        {{ end }}
+        {{ with .EnvFrom}}
+        envFrom:
+        {{ range . }}
+        {{ if (eq .From "configmap") }}
+        - configMapRef:
+            name: {{ .Name }}
+            optional: {{ .Optional }}
+        {{ end }}
+        {{ if (eq .From "secret") }}
+        - secretRef:
+            name: {{ .Name }}
+            optional: {{ .Optional }}
+        {{ end }}
+        {{ end }}
+        {{ end }}
         image: {{ .Image }}
         name: {{ .Name }}
         imagePullPolicy: {{ .PullPolicy }}
@@ -2908,4 +2948,277 @@ ENV OPENJ9_JAVA_OPTIONS=%q
 		})
 	})
 
+	Context("with configmap in multi-doc yaml", func() {
+		It("podman play kube uses env value", func() {
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(withEnv("FOO", "", "configmap", "foo", "FOO", false))))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(0))
+
+			inspect := podmanTest.Podman([]string{"inspect", getCtrNameInPod(pod), "--format", "'{{ .Config.Env }}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(ContainSubstring(`FOO=foo`))
+		})
+
+		It("podman play kube fails for required env value with missing key", func() {
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(withEnv("FOO", "", "configmap", "foo", "MISSING_KEY", false))))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).To(ExitWithError())
+		})
+
+		It("podman play kube succeeds for optional env value with missing key", func() {
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(withEnv("FOO", "", "configmap", "foo", "MISSING_KEY", true))))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(0))
+
+			inspect := podmanTest.Podman([]string{"inspect", getCtrNameInPod(pod), "--format", "'{{ range .Config.Env }}[{{ . }}]{{end}}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(ContainSubstring(`[FOO=]`))
+		})
+
+		It("podman play kube uses all key-value pairs as envs", func() {
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO1", "foo1"), withConfigMapData("FOO2", "foo2"))
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(withEnvFrom("foo", "configmap", false))))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(0))
+
+			inspect := podmanTest.Podman([]string{"inspect", getCtrNameInPod(pod), "--format", "'{{ .Config.Env }}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(ContainSubstring(`FOO1=foo1`))
+			Expect(inspect.OutputToString()).To(ContainSubstring(`FOO2=foo2`))
+		})
+
+		It("podman play kube deployment uses variable from config map", func() {
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(withEnv("FOO", "", "configmap", "foo", "FOO", false))))
+
+			deployment := getDeployment(withPod(pod))
+			deploymentYaml, err := getKubeYaml("deployment", deployment)
+			yamls := []string{cmYaml, deploymentYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(0))
+
+			inspect := podmanTest.Podman([]string{"inspect", fmt.Sprintf("%s-%s-%s", deployment.Name, "pod-0", defaultCtrName), "--format", "'{{ .Config }}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(ContainSubstring(`FOO=foo`))
+
+		})
+
+		It("podman play kube uses env value from configmap for HTTP API client", func() {
+			SkipIfRemote("cannot run in a remote setup")
+			address := url.URL{
+				Scheme: "tcp",
+				Host:   net.JoinHostPort("localhost", randomPort()),
+			}
+
+			session := podmanTest.Podman([]string{
+				"system", "service", "--log-level=debug", "--time=0", address.String(),
+			})
+			defer session.Kill()
+
+			WaitForService(address)
+
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(withEnv("FOO", "", "configmap", "foo", "FOO", false))))
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			podmanConnection, err := bindings.NewConnection(context.Background(), address.String())
+			Expect(err).ToNot(HaveOccurred())
+
+			_, err = play.Kube(podmanConnection, kubeYaml, nil)
+			Expect(err).ToNot(HaveOccurred())
+
+			inspect := podmanTest.Podman([]string{"inspect", getCtrNameInPod(pod), "--format", "'{{ .Config.Env }}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(ContainSubstring(`FOO=foo`))
+		})
+	})
+
+	Context("with configmap in multi-doc yaml and files", func() {
+		It("podman play kube uses env values from both sources", func() {
+			SkipIfRemote("--configmaps is not supported for remote")
+
+			fsCmYamlPathname := filepath.Join(podmanTest.TempDir, "foo-cm.yaml")
+			fsCm := getConfigMap(withConfigMapName("fooFs"), withConfigMapData("FOO_FS", "fooFS"))
+			err := generateKubeYaml("configmap", fsCm, fsCmYamlPathname)
+			Expect(err).To(BeNil())
+
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(
+				withEnv("FOO_FS", "", "configmap", "fooFs", "FOO_FS", false),
+				withEnv("FOO", "", "configmap", "foo", "FOO", false),
+			)))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml, "--configmap", fsCmYamlPathname})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(0))
+
+			inspect := podmanTest.Podman([]string{"inspect", getCtrNameInPod(pod), "--format", "'{{ .Config.Env }}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(And(
+				ContainSubstring(`FOO=foo`),
+				ContainSubstring(`FOO_FS=fooFS`),
+			))
+		})
+
+		It("podman play kube uses all env values from both sources", func() {
+			SkipIfRemote("--configmaps is not supported for remote")
+
+			fsCmYamlPathname := filepath.Join(podmanTest.TempDir, "foo-cm.yaml")
+			fsCm := getConfigMap(withConfigMapName("fooFs"),
+				withConfigMapData("FOO_FS_1", "fooFS1"),
+				withConfigMapData("FOO_FS_2", "fooFS2"))
+			err := generateKubeYaml("configmap", fsCm, fsCmYamlPathname)
+			Expect(err).To(BeNil())
+
+			cm := getConfigMap(withConfigMapName("foo"),
+				withConfigMapData("FOO_1", "foo1"),
+				withConfigMapData("FOO_2", "foo2"),
+			)
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(
+				withEnvFrom("foo", "configmap", false),
+				withEnvFrom("fooFs", "configmap", false),
+			)))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml, "--configmap", fsCmYamlPathname})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(0))
+
+			inspect := podmanTest.Podman([]string{"inspect", getCtrNameInPod(pod), "--format", "'{{ .Config.Env }}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect).Should(Exit(0))
+			Expect(inspect.OutputToString()).To(And(
+				ContainSubstring(`FOO_1=foo1`),
+				ContainSubstring(`FOO_2=foo2`),
+				ContainSubstring(`FOO_FS_1=fooFS1`),
+				ContainSubstring(`FOO_FS_2=fooFS2`),
+			))
+		})
+
+		It("podman play kube reports error when the same configmap name is present in both sources", func() {
+			SkipIfRemote("--configmaps is not supported for remote")
+
+			fsCmYamlPathname := filepath.Join(podmanTest.TempDir, "foo-cm.yaml")
+			fsCm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "fooFS"))
+			err := generateKubeYaml("configmap", fsCm, fsCmYamlPathname)
+			Expect(err).To(BeNil())
+
+			cm := getConfigMap(withConfigMapName("foo"), withConfigMapData("FOO", "foo"))
+
+			cmYaml, err := getKubeYaml("configmap", cm)
+			Expect(err).To(BeNil())
+
+			pod := getPod(withCtr(getCtr(
+				withEnv("FOO", "", "configmap", "foo", "FOO", false),
+			)))
+
+			podYaml, err := getKubeYaml("pod", pod)
+			Expect(err).To(BeNil())
+
+			yamls := []string{cmYaml, podYaml}
+			err = generateMultiDocKubeYaml(yamls, kubeYaml)
+			Expect(err).To(BeNil())
+
+			kube := podmanTest.Podman([]string{"play", "kube", kubeYaml, "--configmap", fsCmYamlPathname})
+			kube.WaitWithDefaultTimeout()
+			Expect(kube).Should(Exit(125))
+			Expect(kube.ErrorToString()).To(ContainSubstring("ambiguous configuration: the same config map foo is present in YAML and in --configmaps"))
+		})
+	})
 })