Add Play

podman play kube adds the ability for the user to recreate pods and containers
from a Kubernetes YAML file in libpod.

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 245 insertions, 0 deletions

diff --git a/cmd/podman/play_kube.go b/cmd/podman/play_kube.go
new file mode 100644
index 000000000..f165c5f0f
--- /dev/null
+++ b/cmd/podman/play_kube.go
@@ -0,0 +1,245 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/containers/image/types"
+	"github.com/containers/libpod/cmd/podman/libpodruntime"
+	"github.com/containers/libpod/cmd/podman/shared"
+	"github.com/containers/libpod/libpod"
+	image2 "github.com/containers/libpod/libpod/image"
+	ns "github.com/containers/libpod/pkg/namespaces"
+	"github.com/containers/libpod/pkg/rootless"
+	"github.com/containers/libpod/pkg/spec"
+	"github.com/containers/storage"
+	"github.com/cri-o/ocicni/pkg/ocicni"
+	"github.com/ghodss/yaml"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+	"k8s.io/api/core/v1"
+)
+
+var (
+	playKubeFlags = []cli.Flag{
+		cli.StringFlag{
+			Name:  "authfile",
+			Usage: "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override. ",
+		},
+		cli.StringFlag{
+			Name:  "cert-dir",
+			Usage: "`pathname` of a directory containing TLS certificates and keys",
+		},
+		cli.StringFlag{
+			Name:  "creds",
+			Usage: "`credentials` (USERNAME:PASSWORD) to use for authenticating to a registry",
+		},
+		cli.BoolFlag{
+			Name:  "quiet, q",
+			Usage: "Suppress output information when pulling images",
+		},
+		cli.StringFlag{
+			Name:  "signature-policy",
+			Usage: "`pathname` of signature policy file (not usually used)",
+		},
+		cli.BoolTFlag{
+			Name:  "tls-verify",
+			Usage: "require HTTPS and verify certificates when contacting registries (default: true)",
+		},
+	}
+	playKubeDescription = "Play a Pod and its containers based on a Kubrernetes YAML"
+	playKubeCommand     = cli.Command{
+		Name:                   "kube",
+		Usage:                  "Play a pod based on Kubernetes YAML",
+		Description:            playKubeDescription,
+		Action:                 playKubeYAMLCmd,
+		Flags:                  sortFlags(playKubeFlags),
+		ArgsUsage:              "kubernetes YAML file",
+		UseShortOptionHandling: true,
+		OnUsageError:           usageErrorHandler,
+	}
+)
+
+func playKubeYAMLCmd(c *cli.Context) error {
+	var (
+		podOptions    []libpod.PodCreateOption
+		podYAML       v1.Pod
+		registryCreds *types.DockerAuthConfig
+		containers    []*libpod.Container
+		writer        io.Writer
+	)
+
+	ctx := getContext()
+	if rootless.IsRootless() {
+		return errors.Wrapf(libpod.ErrNotImplemented, "rootless users")
+	}
+	args := c.Args()
+	if len(args) > 1 {
+		return errors.New("you can only play one kubernetes file at a time")
+	}
+	if len(args) < 1 {
+		return errors.New("you must supply at least one file")
+	}
+
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	content, err := ioutil.ReadFile(args[0])
+	if err != nil {
+		return err
+	}
+
+	if err := yaml.Unmarshal(content, &podYAML); err != nil {
+		return errors.Wrapf(err, "unable to read %s as YAML", args[0])
+	}
+
+	podOptions = append(podOptions, libpod.WithInfraContainer())
+	podOptions = append(podOptions, libpod.WithPodName(podYAML.ObjectMeta.Name))
+	// TODO for now we just used the default kernel namespaces; we need to add/subtract this from yaml
+
+	nsOptions, err := shared.GetNamespaceOptions(strings.Split(DefaultKernelNamespaces, ","))
+	if err != nil {
+		return err
+	}
+	podOptions = append(podOptions, nsOptions...)
+	podPorts := getPodPorts(podYAML.Spec.Containers)
+	podOptions = append(podOptions, libpod.WithInfraContainerPorts(podPorts))
+
+	// Create the Pod
+	pod, err := runtime.NewPod(ctx, podOptions...)
+	if err != nil {
+		return err
+	}
+	// Print the Pod's ID
+	fmt.Println(pod.ID())
+
+	podInfraID, err := pod.InfraContainerID()
+	if err != nil {
+		return err
+	}
+
+	namespaces := map[string]string{
+		// Disabled during code review per mheon
+		//"pid":  fmt.Sprintf("container:%s", podInfraID),
+		"net":  fmt.Sprintf("container:%s", podInfraID),
+		"user": fmt.Sprintf("container:%s", podInfraID),
+		"ipc":  fmt.Sprintf("container:%s", podInfraID),
+		"uts":  fmt.Sprintf("container:%s", podInfraID),
+	}
+	if !c.Bool("quiet") {
+		writer = os.Stderr
+	}
+
+	dockerRegistryOptions := image2.DockerRegistryOptions{
+		DockerRegistryCreds: registryCreds,
+		DockerCertPath:      c.String("cert-dir"),
+	}
+	if c.IsSet("tls-verify") {
+		dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.BoolT("tls-verify"))
+	}
+
+	for _, container := range podYAML.Spec.Containers {
+		newImage, err := runtime.ImageRuntime().New(ctx, container.Image, c.String("signature-policy"), c.String("authfile"), writer, &dockerRegistryOptions, image2.SigningOptions{}, false)
+		if err != nil {
+			return err
+		}
+		createConfig := kubeContainerToCreateConfig(container, runtime, newImage, namespaces)
+		if err != nil {
+			return err
+		}
+		ctr, err := createContainerFromCreateConfig(runtime, createConfig, ctx)
+		if err != nil {
+			return err
+		}
+		containers = append(containers, ctr)
+	}
+
+	// start the containers
+	for _, ctr := range containers {
+		if err := ctr.Start(ctx); err != nil {
+			// Making this a hard failure here to avoid a mess
+			// the other containers are in created status
+			return err
+		}
+		fmt.Println(ctr.ID())
+	}
+
+	return nil
+}
+
+// getPodPorts converts a slice of kube container descriptions to an
+// array of ocicni portmapping descriptions usable in libpod
+func getPodPorts(containers []v1.Container) []ocicni.PortMapping {
+	var infraPorts []ocicni.PortMapping
+	for _, container := range containers {
+		for _, p := range container.Ports {
+			portBinding := ocicni.PortMapping{
+				HostPort:      p.HostPort,
+				ContainerPort: p.ContainerPort,
+				Protocol:      strings.ToLower(string(p.Protocol)),
+			}
+			if p.HostIP != "" {
+				logrus.Debug("HostIP on port bindings is not supported")
+			}
+			infraPorts = append(infraPorts, portBinding)
+		}
+	}
+	return infraPorts
+}
+
+// kubeContainerToCreateConfig takes a v1.Container and returns a createconfig describing a container
+func kubeContainerToCreateConfig(containerYAML v1.Container, runtime *libpod.Runtime, newImage *image2.Image, namespaces map[string]string) *createconfig.CreateConfig {
+	var (
+		containerConfig createconfig.CreateConfig
+		envs            map[string]string
+	)
+
+	containerConfig.Runtime = runtime
+	containerConfig.Image = containerYAML.Image
+	containerConfig.ImageID = newImage.ID()
+	containerConfig.Name = containerYAML.Name
+	containerConfig.Tty = containerYAML.TTY
+	containerConfig.WorkDir = containerYAML.WorkingDir
+	if containerYAML.SecurityContext.ReadOnlyRootFilesystem != nil {
+		containerConfig.ReadOnlyRootfs = *containerYAML.SecurityContext.ReadOnlyRootFilesystem
+	}
+	if containerYAML.SecurityContext.Privileged != nil {
+		containerConfig.Privileged = *containerYAML.SecurityContext.Privileged
+	}
+
+	if containerYAML.SecurityContext.AllowPrivilegeEscalation != nil {
+		containerConfig.NoNewPrivs = !*containerYAML.SecurityContext.AllowPrivilegeEscalation
+	}
+
+	containerConfig.Command = containerYAML.Command
+	containerConfig.StopSignal = 15
+
+	// If the user does not pass in ID mappings, just set to basics
+	if containerConfig.IDMappings == nil {
+		containerConfig.IDMappings = &storage.IDMappingOptions{}
+	}
+
+	containerConfig.NetMode = ns.NetworkMode(namespaces["net"])
+	containerConfig.IpcMode = ns.IpcMode(namespaces["ipc"])
+	containerConfig.UtsMode = ns.UTSMode(namespaces["uts"])
+	// disabled in code review per mheon
+	//containerConfig.PidMode = ns.PidMode(namespaces["pid"])
+	containerConfig.UsernsMode = ns.UsernsMode(namespaces["user"])
+
+	if len(containerYAML.Env) > 0 {
+		envs = make(map[string]string)
+	}
+	// Environment Variables
+	for _, e := range containerYAML.Env {
+		envs[e.Name] = e.Value
+	}
+	containerConfig.Env = envs
+	return &containerConfig
+}