pod: add exit policies

Add the notion of an "exit policy" to a pod.  This policy controls the
behaviour when the last container of pod exits.  Initially, there are
two policies:

 - "continue" : the pod continues running. This is the default policy
                when creating a pod.

 - "stop" : stop the pod when the last container exits. This is the
            default behaviour for `play kube`.

In order to implement the deferred stop of a pod, add a worker queue to
the libpod runtime.  The queue will pick up work items and in this case
helps resolve dead locks that would otherwise occur if we attempted to
stop a pod during container cleanup.

Note that the default restart policy of `play kube` is "Always".  Hence,
in order to really solve #13464, the YAML files must set a custom
restart policy; the tests use "OnFailure".

Fixes: #13464
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/libpod/options.go b/libpod/options.go
index 98eb45e76..9b83cb76a 100644
--- a/libpod/options.go
+++ b/libpod/options.go
@@ -1843,6 +1843,24 @@ func WithPodName(name string) PodCreateOption {
 	}
 }
 
+// WithPodExitPolicy sets the exit policy of the pod.
+func WithPodExitPolicy(policy string) PodCreateOption {
+	return func(pod *Pod) error {
+		if pod.valid {
+			return define.ErrPodFinalized
+		}
+
+		parsed, err := config.ParsePodExitPolicy(policy)
+		if err != nil {
+			return err
+		}
+
+		pod.config.ExitPolicy = parsed
+
+		return nil
+	}
+}
+
 // WithPodHostname sets the hostname of the pod.
 func WithPodHostname(hostname string) PodCreateOption {
 	return func(pod *Pod) error {