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, 5 insertions, 0 deletions

diff --git a/pkg/specgen/generate/kube/kube.go b/pkg/specgen/generate/kube/kube.go
index 5188abc3a..c01d7a1f0 100644
--- a/pkg/specgen/generate/kube/kube.go
+++ b/pkg/specgen/generate/kube/kube.go
@@ -114,6 +114,9 @@ type CtrSpecGenOptions struct {
 	Labels map[string]string
 	//
 	IsInfra bool
+	// InitContainerType sets what type the init container is
+	// Note: When playing a kube yaml, the inti container type will be set to "always" only
+	InitContainerType string
 }
 
 func ToSpecGen(ctx context.Context, opts *CtrSpecGenOptions) (*specgen.SpecGenerator, error) {
@@ -135,6 +138,8 @@ func ToSpecGen(ctx context.Context, opts *CtrSpecGenOptions) (*specgen.SpecGener
 		Driver: opts.LogDriver,
 	}
 
+	s.InitContainerType = opts.InitContainerType
+
 	setupSecurityContext(s, opts.Container)
 	err := setupLivenessProbe(s, opts.Container, opts.RestartPolicy)
 	if err != nil {