Adds support to preserve auto update labels in generate and play kube

In the case of generate kube the auto-update labels will be converted into kube annotations and for play kube they will be converted back to labels since that's what podman understands

Signed-off-by: Eduardo Vega <edvegavalerio@gmail.com>

docs/source/markdown/podman-auto-update.1.md

@@ -14,7 +14,7 @@ The label "image" is an alternative to "registry" maintained for backwards compa
 An image is considered updated if the digest in the local storage is different than the one of the remote image.
 If an image must be updated, Podman pulls it down and restarts the systemd unit executing the container.
 
-The registry policy requires a requires a fully-qualified image reference (e.g., quay.io/podman/stable:latest) to be used to create the container.
+The registry policy requires a fully-qualified image reference (e.g., quay.io/podman/stable:latest) to be used to create the container.
 This enforcement is necessary to know which image to actually check and pull.
 If an image ID was used, Podman would not know which image to check/pull anymore.
 

libpod/kube.go

@@ -218,9 +218,15 @@ func (p *Pod) podWithContainers(containers []*Container, ports []v1.ContainerPor
 	deDupPodVolumes := make(map[string]*v1.Volume)
 	first := true
 	podContainers := make([]v1.Container, 0, len(containers))
+	podAnnotations := make(map[string]string)
 	dnsInfo := v1.PodDNSConfig{}
 	for _, ctr := range containers {
 		if !ctr.IsInfra() {
+			// Convert auto-update labels into kube annotations
+			for k, v := range getAutoUpdateAnnotations(removeUnderscores(ctr.Name()), ctr.Labels()) {
+				podAnnotations[k] = v
+			}
+
 			ctr, volumes, _, err := containerToV1Container(ctr)
 			if err != nil {
 				return nil, err
@@ -267,10 +273,16 @@ func (p *Pod) podWithContainers(containers []*Container, ports []v1.ContainerPor
 		podVolumes = append(podVolumes, *vol)
 	}
 
-	return addContainersAndVolumesToPodObject(podContainers, podVolumes, p.Name(), &dnsInfo, hostNetwork), nil
+	return newPodObject(
+		p.Name(),
+		podAnnotations,
+		podContainers,
+		podVolumes,
+		&dnsInfo,
+		hostNetwork), nil
 }
 
-func addContainersAndVolumesToPodObject(containers []v1.Container, volumes []v1.Volume, podName string, dnsOptions *v1.PodDNSConfig, hostNetwork bool) *v1.Pod {
+func newPodObject(podName string, annotations map[string]string, containers []v1.Container, volumes []v1.Volume, dnsOptions *v1.PodDNSConfig, hostNetwork bool) *v1.Pod {
 	tm := v12.TypeMeta{
 		Kind:       "Pod",
 		APIVersion: "v1",
@@ -287,6 +299,7 @@ func addContainersAndVolumesToPodObject(containers []v1.Container, volumes []v1.
 		// will reflect time this is run (not container create time) because the conversion
 		// of the container create time to v1 Time is probably not warranted nor worthwhile.
 		CreationTimestamp: v12.Now(),
+		Annotations:       annotations,
 	}
 	ps := v1.PodSpec{
 		Containers:  containers,
@@ -311,7 +324,13 @@ func simplePodWithV1Containers(ctrs []*Container) (*v1.Pod, error) {
 	kubeVolumes := make([]v1.Volume, 0)
 	hostNetwork := true
 	podDNS := v1.PodDNSConfig{}
+	kubeAnnotations := make(map[string]string)
 	for _, ctr := range ctrs {
+		// Convert auto-update labels into kube annotations
+		for k, v := range getAutoUpdateAnnotations(removeUnderscores(ctr.Name()), ctr.Labels()) {
+			kubeAnnotations[k] = v
+		}
+
 		if !ctr.HostNetwork() {
 			hostNetwork = false
 		}
@@ -355,7 +374,13 @@ func simplePodWithV1Containers(ctrs []*Container) (*v1.Pod, error) {
 			}
 		} // end if ctrDNS
 	}
-	return addContainersAndVolumesToPodObject(kubeCtrs, kubeVolumes, strings.ReplaceAll(ctrs[0].Name(), "_", ""), &podDNS, hostNetwork), nil
+	return newPodObject(
+		strings.ReplaceAll(ctrs[0].Name(), "_", ""),
+		kubeAnnotations,
+		kubeCtrs,
+		kubeVolumes,
+		&podDNS,
+		hostNetwork), nil
 }
 
 // containerToV1Container converts information we know about a libpod container
@@ -792,3 +817,21 @@ func generateKubeVolumeDeviceFromLinuxDevice(devices []specs.LinuxDevice) []v1.V
 func removeUnderscores(s string) string {
 	return strings.Replace(s, "_", "", -1)
 }
+
+// getAutoUpdateAnnotations searches for auto-update container labels
+// and returns them as kube annotations
+func getAutoUpdateAnnotations(ctrName string, ctrLabels map[string]string) map[string]string {
+	autoUpdateLabel := "io.containers.autoupdate"
+	annotations := make(map[string]string)
+
+	for k, v := range ctrLabels {
+		if strings.Contains(k, autoUpdateLabel) {
+			// since labels can variate between containers within a pod, they will be
+			// identified with the container name when converted into kube annotations
+			kc := fmt.Sprintf("%s/%s", k, ctrName)
+			annotations[kc] = v
+		}
+	}
+
+	return annotations
+}

pkg/domain/infra/abi/play.go

@@ -16,6 +16,7 @@ import (
 	"github.com/containers/image/v5/types"
 	"github.com/containers/podman/v3/libpod"
 	"github.com/containers/podman/v3/libpod/define"
+	"github.com/containers/podman/v3/pkg/autoupdate"
 	"github.com/containers/podman/v3/pkg/domain/entities"
 	"github.com/containers/podman/v3/pkg/specgen"
 	"github.com/containers/podman/v3/pkg/specgen/generate"
@@ -73,7 +74,7 @@ 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)
+			r, err := ic.playKubePod(ctx, podTemplateSpec.ObjectMeta.Name, &podTemplateSpec, options, &ipIndex, podYAML.Annotations)
 			if err != nil {
 				return nil, err
 			}
@@ -143,7 +144,7 @@ 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)
+		podReport, err := ic.playKubePod(ctx, podName, &podSpec, options, ipIndex, deploymentYAML.Annotations)
 		if err != nil {
 			return nil, errors.Wrapf(err, "error encountered while bringing up pod %s", podName)
 		}
@@ -152,7 +153,7 @@ 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) (*entities.PlayKubeReport, error) {
+func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podYAML *v1.PodTemplateSpec, options entities.PlayKubeOptions, ipIndex *int, annotations map[string]string) (*entities.PlayKubeReport, error) {
 	var (
 		writer      io.Writer
 		playKubePod entities.PlayKubePod
@@ -265,6 +266,9 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
 
 	containers := make([]*libpod.Container, 0, len(podYAML.Spec.Containers))
 	for _, container := range podYAML.Spec.Containers {
+		// Contains all labels obtained from kube
+		labels := make(map[string]string)
+
 		// NOTE: set the pull policy to "newer".  This will cover cases
 		// where the "latest" tag requires a pull and will also
 		// transparently handle "localhost/" prefixed files which *may*
@@ -292,6 +296,22 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
 			return nil, err
 		}
 
+		// Handle kube annotations
+		for k, v := range annotations {
+			switch k {
+			// Auto update annotation without container name will apply to
+			// all containers within the pod
+			case autoupdate.Label, autoupdate.AuthfileLabel:
+				labels[k] = v
+			// Auto update annotation with container name will apply only
+			// to the specified container
+			case fmt.Sprintf("%s/%s", autoupdate.Label, container.Name),
+				fmt.Sprintf("%s/%s", autoupdate.AuthfileLabel, container.Name):
+				prefixAndCtr := strings.Split(k, "/")
+				labels[prefixAndCtr[0]] = v
+			}
+		}
+
 		specgenOpts := kube.CtrSpecGenOptions{
 			Container:      container,
 			Image:          pulledImages[0],
@@ -305,6 +325,7 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
 			NetNSIsHost:    p.NetNS.IsHost(),
 			SecretsManager: secretsManager,
 			LogDriver:      options.LogDriver,
+			Labels:         labels,
 		}
 		specGen, err := kube.ToSpecGen(ctx, &specgenOpts)
 		if err != nil {

pkg/specgen/generate/kube/kube.go

@@ -100,6 +100,8 @@ type CtrSpecGenOptions struct {
 	SecretsManager *secrets.SecretsManager
 	// LogDriver which should be used for the container
 	LogDriver string
+	// Labels define key-value pairs of metadata
+	Labels map[string]string
 }
 
 func ToSpecGen(ctx context.Context, opts *CtrSpecGenOptions) (*specgen.SpecGenerator, error) {
@@ -278,6 +280,19 @@ func ToSpecGen(ctx context.Context, opts *CtrSpecGenOptions) (*specgen.SpecGener
 		s.NetNS.NSMode = specgen.Host
 	}
 
+	// Add labels that come from kube
+	if len(s.Labels) == 0 {
+		// If there are no labels, let's use the map that comes
+		// from kube
+		s.Labels = opts.Labels
+	} else {
+		// If there are already labels in the map, append the ones
+		// obtained from kube
+		for k, v := range opts.Labels {
+			s.Labels[k] = v
+		}
+	}
+
 	return s, nil
 }
 

test/e2e/generate_kube_test.go

@@ -873,4 +873,54 @@ USER test1`
 			}
 		}
 	})
+
+	It("podman generate kube on container with auto update labels", func() {
+		top := podmanTest.Podman([]string{"run", "-dt", "--name", "top", "--label", "io.containers.autoupdate=local", ALPINE, "top"})
+		top.WaitWithDefaultTimeout()
+		Expect(top.ExitCode()).To(Equal(0))
+
+		kube := podmanTest.Podman([]string{"generate", "kube", "top"})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube.ExitCode()).To(Equal(0))
+
+		pod := new(v1.Pod)
+		err := yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+
+		v, ok := pod.GetAnnotations()["io.containers.autoupdate/top"]
+		Expect(ok).To(Equal(true))
+		Expect(v).To(Equal("local"))
+	})
+
+	It("podman generate kube on pod with auto update labels in all containers", func() {
+		pod1 := podmanTest.Podman([]string{"pod", "create", "--name", "pod1"})
+		pod1.WaitWithDefaultTimeout()
+		Expect(pod1.ExitCode()).To(Equal(0))
+
+		top1 := podmanTest.Podman([]string{"run", "-dt", "--name", "top1", "--pod", "pod1", "--label", "io.containers.autoupdate=registry", "--label", "io.containers.autoupdate.authfile=/some/authfile.json", ALPINE, "top"})
+		top1.WaitWithDefaultTimeout()
+		Expect(top1.ExitCode()).To(Equal(0))
+
+		top2 := podmanTest.Podman([]string{"run", "-dt", "--name", "top2", "--pod", "pod1", "--label", "io.containers.autoupdate=registry", "--label", "io.containers.autoupdate.authfile=/some/authfile.json", ALPINE, "top"})
+		top2.WaitWithDefaultTimeout()
+		Expect(top2.ExitCode()).To(Equal(0))
+
+		kube := podmanTest.Podman([]string{"generate", "kube", "pod1"})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube.ExitCode()).To(Equal(0))
+
+		pod := new(v1.Pod)
+		err := yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+
+		for _, ctr := range []string{"top1", "top2"} {
+			v, ok := pod.GetAnnotations()["io.containers.autoupdate/"+ctr]
+			Expect(ok).To(Equal(true))
+			Expect(v).To(Equal("registry"))
+
+			v, ok = pod.GetAnnotations()["io.containers.autoupdate.authfile/"+ctr]
+			Expect(ok).To(Equal(true))
+			Expect(v).To(Equal("/some/authfile.json"))
+		}
+	})
 })

test/e2e/play_kube_test.go

@@ -768,6 +768,12 @@ func getCtr(options ...ctrOption) *Ctr {
 
 type ctrOption func(*Ctr)
 
+func withName(name string) ctrOption {
+	return func(c *Ctr) {
+		c.Name = name
+	}
+}
+
 func withCmd(cmd []string) ctrOption {
 	return func(c *Ctr) {
 		c.Cmd = cmd
@@ -2305,4 +2311,79 @@ invalid kube kind
 		kube.WaitWithDefaultTimeout()
 		Expect(kube.ExitCode()).To(Not(Equal(0)))
 	})
+
+	It("podman play kube with auto update annotations for all containers", func() {
+		ctr01Name := "ctr01"
+		ctr02Name := "ctr02"
+		podName := "foo"
+		autoUpdateRegistry := "io.containers.autoupdate"
+		autoUpdateRegistryValue := "registry"
+		autoUpdateAuthfile := "io.containers.autoupdate.authfile"
+		autoUpdateAuthfileValue := "/some/authfile.json"
+
+		ctr01 := getCtr(withName(ctr01Name))
+		ctr02 := getCtr(withName(ctr02Name))
+
+		pod := getPod(
+			withPodName(podName),
+			withCtr(ctr01),
+			withCtr(ctr02),
+			withAnnotation(autoUpdateRegistry, autoUpdateRegistryValue),
+			withAnnotation(autoUpdateAuthfile, autoUpdateAuthfileValue))
+
+		err = generateKubeYaml("pod", pod, kubeYaml)
+		Expect(err).To(BeNil())
+
+		kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube.ExitCode()).To(Equal(0))
+
+		for _, ctr := range []string{podName + "-" + ctr01Name, podName + "-" + ctr02Name} {
+			inspect := podmanTest.Podman([]string{"inspect", ctr, "--format", "'{{.Config.Labels}}'"})
+			inspect.WaitWithDefaultTimeout()
+			Expect(inspect.ExitCode()).To(Equal(0))
+
+			Expect(inspect.OutputToString()).To(ContainSubstring(autoUpdateRegistry + ":" + autoUpdateRegistryValue))
+			Expect(inspect.OutputToString()).To(ContainSubstring(autoUpdateAuthfile + ":" + autoUpdateAuthfileValue))
+		}
+	})
+
+	It("podman play kube with auto update annotations for first container only", func() {
+		ctr01Name := "ctr01"
+		ctr02Name := "ctr02"
+		autoUpdateRegistry := "io.containers.autoupdate"
+		autoUpdateRegistryValue := "local"
+
+		ctr01 := getCtr(withName(ctr01Name))
+		ctr02 := getCtr(withName(ctr02Name))
+
+		pod := getPod(
+			withCtr(ctr01),
+			withCtr(ctr02),
+		)
+
+		deployment := getDeployment(
+			withPod(pod),
+			withDeploymentAnnotation(autoUpdateRegistry+"/"+ctr01Name, autoUpdateRegistryValue),
+		)
+
+		err = generateKubeYaml("deployment", deployment, kubeYaml)
+		Expect(err).To(BeNil())
+
+		kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube.ExitCode()).To(Equal(0))
+
+		podName := getPodNamesInDeployment(deployment)[0].Name
+
+		inspect := podmanTest.Podman([]string{"inspect", podName + "-" + ctr01Name, "--format", "'{{.Config.Labels}}'"})
+		inspect.WaitWithDefaultTimeout()
+		Expect(inspect.ExitCode()).To(Equal(0))
+		Expect(inspect.OutputToString()).To(ContainSubstring(autoUpdateRegistry + ":" + autoUpdateRegistryValue))
+
+		inspect = podmanTest.Podman([]string{"inspect", podName + "-" + ctr02Name, "--format", "'{{.Config.Labels}}'"})
+		inspect.WaitWithDefaultTimeout()
+		Expect(inspect.ExitCode()).To(Equal(0))
+		Expect(inspect.OutputToString()).To(ContainSubstring(`map[]`))
+	})
 })