From f269be3a314a0903bb74a20de0e93b4f274531e6 Mon Sep 17 00:00:00 2001
From: Valentin Rothberg <rothberg@redhat.com>
Date: Tue, 5 May 2020 11:35:32 +0200
Subject: 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>
---
 pkg/domain/infra/abi/generate.go | 85 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)

(limited to 'pkg/domain/infra/abi/generate.go')

diff --git a/pkg/domain/infra/abi/generate.go b/pkg/domain/infra/abi/generate.go
index f69ba560e..be5d452bd 100644
--- a/pkg/domain/infra/abi/generate.go
+++ b/pkg/domain/infra/abi/generate.go
@@ -1,14 +1,18 @@
 package abi
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"strings"
 
 	"github.com/containers/libpod/libpod"
+	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/pkg/domain/entities"
 	"github.com/containers/libpod/pkg/systemd/generate"
+	"github.com/ghodss/yaml"
 	"github.com/pkg/errors"
+	k8sAPI "k8s.io/api/core/v1"
 )
 
 func (ic *ContainerEngine) GenerateSystemd(ctx context.Context, nameOrID string, options entities.GenerateSystemdOptions) (*entities.GenerateSystemdReport, error) {
@@ -172,3 +176,84 @@ func generateServiceName(ctr *libpod.Container, pod *libpod.Pod, options entitie
 	}
 	return ctrName, fmt.Sprintf("%s-%s", kind, name)
 }
+
+func (ic *ContainerEngine) GenerateKube(ctx context.Context, nameOrID string, options entities.GenerateKubeOptions) (*entities.GenerateKubeReport, error) {
+	var (
+		pod          *libpod.Pod
+		podYAML      *k8sAPI.Pod
+		err          error
+		ctr          *libpod.Container
+		servicePorts []k8sAPI.ServicePort
+		serviceYAML  k8sAPI.Service
+	)
+	// Get the container in question.
+	ctr, err = ic.Libpod.LookupContainer(nameOrID)
+	if err != nil {
+		pod, err = ic.Libpod.LookupPod(nameOrID)
+		if err != nil {
+			return nil, err
+		}
+		podYAML, servicePorts, err = pod.GenerateForKube()
+	} else {
+		if len(ctr.Dependencies()) > 0 {
+			return nil, errors.Wrapf(define.ErrNotImplemented, "containers with dependencies")
+		}
+		podYAML, err = ctr.GenerateForKube()
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	if options.Service {
+		serviceYAML = libpod.GenerateKubeServiceFromV1Pod(podYAML, servicePorts)
+	}
+
+	content, err := generateKubeOutput(podYAML, &serviceYAML)
+	if err != nil {
+		return nil, err
+	}
+
+	return &entities.GenerateKubeReport{Reader: bytes.NewReader(content)}, nil
+}
+
+func generateKubeOutput(podYAML *k8sAPI.Pod, serviceYAML *k8sAPI.Service) ([]byte, error) {
+	var (
+		output            []byte
+		marshalledPod     []byte
+		marshalledService []byte
+		err               error
+	)
+
+	marshalledPod, err = yaml.Marshal(podYAML)
+	if err != nil {
+		return nil, err
+	}
+
+	if serviceYAML != nil {
+		marshalledService, err = yaml.Marshal(serviceYAML)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	header := `# Generation of Kubernetes YAML is still under development!
+#
+# Save the output of this file and use kubectl create -f to import
+# it into Kubernetes.
+#
+# Created with podman-%s
+`
+	podmanVersion, err := define.GetVersion()
+	if err != nil {
+		return nil, err
+	}
+
+	output = append(output, []byte(fmt.Sprintf(header, podmanVersion.Version))...)
+	output = append(output, marshalledPod...)
+	if serviceYAML != nil {
+		output = append(output, []byte("---\n")...)
+		output = append(output, marshalledService...)
+	}
+
+	return output, nil
+}
-- 
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