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package main
import (
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/containers/image/types"
"github.com/containers/libpod/cmd/podman/cliconfig"
"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/spf13/cobra"
"k8s.io/api/core/v1"
)
var (
playKubeCommand cliconfig.KubePlayValues
playKubeDescription = "Play a Pod and its containers based on a Kubrernetes YAML"
_playKubeCommand = &cobra.Command{
Use: "kube",
Short: "Play a pod based on Kubernetes YAML",
Long: playKubeDescription,
RunE: func(cmd *cobra.Command, args []string) error {
playKubeCommand.InputArgs = args
playKubeCommand.GlobalFlags = MainGlobalOpts
return playKubeYAMLCmd(&playKubeCommand)
},
Example: `podman play kube demo.yml
podman play kube --cert-dir /mycertsdir --tls-verify=true --quiet myWebPod`,
}
)
func init() {
playKubeCommand.Command = _playKubeCommand
playKubeCommand.SetUsageTemplate(UsageTemplate())
flags := playKubeCommand.Flags()
flags.StringVar(&playKubeCommand.Authfile, "authfile", "", "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override")
flags.StringVar(&playKubeCommand.CertDir, "cert-dir", "", "`Pathname` of a directory containing TLS certificates and keys")
flags.StringVar(&playKubeCommand.Creds, "creds", "", "`Credentials` (USERNAME:PASSWORD) to use for authenticating to a registry")
flags.BoolVarP(&playKubeCommand.Quiet, "quiet", "q", false, "Suppress output information when pulling images")
flags.StringVar(&playKubeCommand.SignaturePolicy, "signature-policy", "", "`Pathname` of signature policy file (not usually used)")
flags.BoolVar(&playKubeCommand.TlsVerify, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries (default: true)")
rootCmd.AddCommand(playKubeCommand.Command)
}
func playKubeYAMLCmd(c *cliconfig.KubePlayValues) 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.InputArgs
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.PodmanCommand)
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.Quiet {
writer = os.Stderr
}
dockerRegistryOptions := image2.DockerRegistryOptions{
DockerRegistryCreds: registryCreds,
DockerCertPath: c.CertDir,
}
if c.Flag("tls-verify").Changed {
dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.TlsVerify)
}
for _, container := range podYAML.Spec.Containers {
newImage, err := runtime.ImageRuntime().New(ctx, container.Image, c.SignaturePolicy, c.Authfile, writer, &dockerRegistryOptions, image2.SigningOptions{}, false, nil)
if err != nil {
return err
}
createConfig := kubeContainerToCreateConfig(container, runtime, newImage, namespaces)
if err != nil {
return err
}
ctr, err := createContainerFromCreateConfig(runtime, createConfig, ctx, pod)
if err != nil {
return err
}
containers = append(containers, ctr)
}
// start the containers
for _, ctr := range containers {
if err := ctr.Start(ctx, false); 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
}
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