Add init containers to generate and play kube

Kubernetes has a concept of init containers that run and exit before
the regular containers in a pod are started. We added init containers
to podman pods as well. This patch adds support for generating init
containers in the kube yaml when a pod we are converting had init
containers. When playing a kube yaml, it detects an init container
and creates such a container in podman accordingly.
Note, only init containers created with the init type set to "always"
will be generated as the "once" option deletes the init container after
it has run and exited. Play kube will always creates init containers
with the "always" init container type.

Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/test/e2e/generate_kube_test.go b/test/e2e/generate_kube_test.go
index 8996bf6a0..bf89a0708 100644
--- a/test/e2e/generate_kube_test.go
+++ b/test/e2e/generate_kube_test.go
@@ -174,6 +174,78 @@ var _ = Describe("Podman generate kube", func() {
 		Expect(string(kube.Out.Contents())).To(ContainSubstring(`name: pod2`))
 	})
 
+	It("podman generate kube on pod with init containers", func() {
+		session := podmanTest.Podman([]string{"create", "--pod", "new:toppod", "--init-ctr", "always", ALPINE, "echo", "hello"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		session = podmanTest.Podman([]string{"create", "--pod", "toppod", "--init-ctr", "always", ALPINE, "echo", "world"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		session = podmanTest.Podman([]string{"create", "--pod", "toppod", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		kube := podmanTest.Podman([]string{"generate", "kube", "toppod"})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube).Should(Exit(0))
+
+		pod := new(v1.Pod)
+		err := yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+		Expect(pod.Spec.HostNetwork).To(Equal(false))
+
+		numContainers := len(pod.Spec.Containers) + len(pod.Spec.InitContainers)
+		Expect(numContainers).To(Equal(3))
+
+		// Init container should be in the generated kube yaml if created with "once" type and the pod has not been started
+		session = podmanTest.Podman([]string{"create", "--pod", "new:toppod-2", "--init-ctr", "once", ALPINE, "echo", "using once type"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		session = podmanTest.Podman([]string{"create", "--pod", "toppod-2", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		kube = podmanTest.Podman([]string{"generate", "kube", "toppod-2"})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube).Should(Exit(0))
+
+		pod = new(v1.Pod)
+		err = yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+		Expect(pod.Spec.HostNetwork).To(Equal(false))
+
+		numContainers = len(pod.Spec.Containers) + len(pod.Spec.InitContainers)
+		Expect(numContainers).To(Equal(2))
+
+		// Init container should not be in the generated kube yaml if created with "once" type and the pod has been started
+		session = podmanTest.Podman([]string{"create", "--pod", "new:toppod-3", "--init-ctr", "once", ALPINE, "echo", "using once type"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		session = podmanTest.Podman([]string{"create", "--pod", "toppod-3", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		session = podmanTest.Podman([]string{"pod", "start", "toppod-3"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		kube = podmanTest.Podman([]string{"generate", "kube", "toppod-3"})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube).Should(Exit(0))
+
+		pod = new(v1.Pod)
+		err = yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+		Expect(pod.Spec.HostNetwork).To(Equal(false))
+
+		numContainers = len(pod.Spec.Containers) + len(pod.Spec.InitContainers)
+		Expect(numContainers).To(Equal(1))
+	})
+
 	It("podman generate kube on pod with host network", func() {
 		podSession := podmanTest.Podman([]string{"pod", "create", "--name", "testHostNetwork", "--network", "host"})
 		podSession.WaitWithDefaultTimeout()