add {generate,play} kube

Add the `podman generate kube` and `podman play kube` command.  The code
has largely been copied from Podman v1 but restructured to not leak the
K8s core API into the (remote) client.

Both commands are added in the same commit to allow for enabling the
tests at the same time.

Move some exports from `cmd/podman/common` to the appropriate places in
the backend to avoid circular dependencies.

Move definitions of label annotations to `libpod/define` and set the
security-opt labels in the frontend to make kube tests pass.

Implement rest endpoints, bindings and the tunnel interface.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

3 files changed, 70 insertions, 2 deletions

diff --git a/cmd/podman/generate/generate.go b/cmd/podman/generate/generate.go
index b112e666a..7803c0c78 100644
--- a/cmd/podman/generate/generate.go
+++ b/cmd/podman/generate/generate.go
@@ -22,7 +22,7 @@ var (
 
 func init() {
 	registry.Commands = append(registry.Commands, registry.CliCommand{
-		Mode:    []entities.EngineMode{entities.ABIMode},
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
 		Command: generateCmd,
 	})
 }
diff --git a/cmd/podman/generate/kube.go b/cmd/podman/generate/kube.go
new file mode 100644
index 000000000..86a9cc686
--- /dev/null
+++ b/cmd/podman/generate/kube.go
@@ -0,0 +1,68 @@
+package pods
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/containers/libpod/cmd/podman/registry"
+	"github.com/containers/libpod/cmd/podman/utils"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+var (
+	kubeOptions     = entities.GenerateKubeOptions{}
+	kubeFile        = ""
+	kubeDescription = `Command generates Kubernetes pod and service YAML (v1 specification) from a Podman container or pod.
+
+Whether the input is for a container or pod, Podman will always generate the specification as a pod.`
+
+	kubeCmd = &cobra.Command{
+		Use:   "kube [flags] CONTAINER | POD",
+		Short: "Generate Kubernetes YAML from a container or pod.",
+		Long:  kubeDescription,
+		RunE:  kube,
+		Args:  cobra.ExactArgs(1),
+		Example: `podman generate kube ctrID
+  podman generate kube podID
+  podman generate kube --service podID`,
+	}
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: kubeCmd,
+		Parent:  generateCmd,
+	})
+	flags := kubeCmd.Flags()
+	flags.BoolVarP(&kubeOptions.Service, "service", "s", false, "Generate YAML for a Kubernetes service object")
+	flags.StringVarP(&kubeFile, "filename", "f", "", "Write output to the specified path")
+	flags.SetNormalizeFunc(utils.AliasFlags)
+}
+
+func kube(cmd *cobra.Command, args []string) error {
+	report, err := registry.ContainerEngine().GenerateKube(registry.GetContext(), args[0], kubeOptions)
+	if err != nil {
+		return err
+	}
+
+	content, err := ioutil.ReadAll(report.Reader)
+	if err != nil {
+		return err
+	}
+	if cmd.Flags().Changed("filename") {
+		if _, err := os.Stat(kubeFile); err == nil {
+			return errors.Errorf("cannot write to %q", kubeFile)
+		}
+		if err := ioutil.WriteFile(kubeFile, content, 0644); err != nil {
+			return errors.Wrapf(err, "cannot write to %q", kubeFile)
+		}
+		return nil
+	}
+
+	fmt.Println(string(content))
+	return nil
+}
diff --git a/cmd/podman/generate/systemd.go b/cmd/podman/generate/systemd.go
index 55d770249..20d9748d4 100644
--- a/cmd/podman/generate/systemd.go
+++ b/cmd/podman/generate/systemd.go
@@ -29,7 +29,7 @@ var (
 
 func init() {
 	registry.Commands = append(registry.Commands, registry.CliCommand{
-		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Mode:    []entities.EngineMode{entities.ABIMode},
 		Command: systemdCmd,
 		Parent:  generateCmd,
 	})