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, 4 insertions, 0 deletions

diff --git a/libpod/pod.go b/libpod/pod.go
index 237c42901..2211d5be7 100644
--- a/libpod/pod.go
+++ b/libpod/pod.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/containers/common/pkg/config"
 	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/podman/v4/libpod/lock"
 	"github.com/opencontainers/runtime-spec/specs-go"
@@ -70,6 +71,9 @@ type PodConfig struct {
 	// container has been created with.
 	CreateCommand []string `json:"CreateCommand,omitempty"`
 
+	// The pod's exit policy.
+	ExitPolicy config.PodExitPolicy `json:"ExitPolicy,omitempty"`
+
 	// ID of the pod's lock
 	LockID uint32 `json:"lockID"`
 }