implement init containers in podman

this is the first pass at implementing init containers for podman pods.
init containersare made popular by k8s as a way to run setup for pods
before the pods standard containers run.

unlike k8s, we support two styles of init containers: always and
oneshot.  always means the container stays in the pod and starts
whenever a pod is started.  this does not apply to pods restarting.
oneshot means the container runs onetime when the pod starts and then is
removed.

Signed-off-by: Brent Baude <bbaude@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/pkg/specgen/generate/container_create.go b/pkg/specgen/generate/container_create.go
index 4e3a86ae4..5101a6ccb 100644
--- a/pkg/specgen/generate/container_create.go
+++ b/pkg/specgen/generate/container_create.go
@@ -144,11 +144,14 @@ func MakeContainer(ctx context.Context, rt *libpod.Runtime, s *specgen.SpecGener
 		options = append(options, libpod.WithNetworkAliases(s.Aliases))
 	}
 
+	if containerType := s.InitContainerType; len(containerType) > 0 {
+		options = append(options, libpod.WithInitCtrType(containerType))
+	}
+
 	if len(s.Devices) > 0 {
 		opts = extractCDIDevices(s)
 		options = append(options, opts...)
 	}
-
 	runtimeSpec, err := SpecGenToOCI(ctx, s, rt, rtc, newImage, finalMounts, pod, command)
 	if err != nil {
 		return nil, err