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>

2 files changed, 9 insertions, 0 deletions

diff --git a/cmd/podman/common/completion.go b/cmd/podman/common/completion.go
index ddf922b2a..6149a4465 100644
--- a/cmd/podman/common/completion.go
+++ b/cmd/podman/common/completion.go
@@ -492,6 +492,11 @@ func AutocompleteImages(cmd *cobra.Command, args []string, toComplete string) ([
 	return getImages(cmd, toComplete)
 }
 
+// AutocompletePodExitPolicy - Autocomplete pod exit policy.
+func AutocompletePodExitPolicy(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	return config.PodExitPolicies, cobra.ShellCompDirectiveNoFileComp
+}
+
 // AutocompleteCreateRun - Autocomplete only the fist argument as image and then do file completion.
 func AutocompleteCreateRun(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 	if !validCurrentCmdLine(cmd, args, toComplete) {
diff --git a/cmd/podman/pods/create.go b/cmd/podman/pods/create.go
index 4623ade63..62f820790 100644
--- a/cmd/podman/pods/create.go
+++ b/cmd/podman/pods/create.go
@@ -72,6 +72,10 @@ func init() {
 	flags.StringVarP(&createOptions.Name, nameFlagName, "n", "", "Assign a name to the pod")
 	_ = createCommand.RegisterFlagCompletionFunc(nameFlagName, completion.AutocompleteNone)
 
+	policyFlag := "exit-policy"
+	flags.StringVarP(&createOptions.ExitPolicy, policyFlag, "", string(containerConfig.Engine.PodExitPolicy), "Behaviour when the last container exits")
+	_ = createCommand.RegisterFlagCompletionFunc(policyFlag, common.AutocompletePodExitPolicy)
+
 	infraImageFlagName := "infra-image"
 	var defInfraImage string
 	if !registry.IsRemote() {