pod create: add `--infra-conmon-pidfile`

Add an `--infra-conmon-pidfile` flag to `podman-pod-create` to write the
infra container's conmon process ID to a specified path.  Several
container sub-commands already support `--conmon-pidfile` which is
especially helpful to allow for systemd to access and track the conmon
processes.  This allows for easily tracking the conmon process of a
pod's infra container.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/cmd/podman/pods/create.go b/cmd/podman/pods/create.go
index 5ed5fa57c..51b7a7d52 100644
--- a/cmd/podman/pods/create.go
+++ b/cmd/podman/pods/create.go
@@ -53,6 +53,7 @@ func init() {
 	flags.AddFlagSet(common.GetNetFlags())
 	flags.StringVar(&createOptions.CGroupParent, "cgroup-parent", "", "Set parent cgroup for the pod")
 	flags.BoolVar(&createOptions.Infra, "infra", true, "Create an infra container associated with the pod to share namespaces with")
+	flags.StringVar(&createOptions.InfraConmonPidFile, "infra-conmon-pidfile", "", "Path to the file that will receive the POD of the infra container's conmon")
 	flags.StringVar(&createOptions.InfraImage, "infra-image", containerConfig.Engine.InfraImage, "The image of the infra container to associate with the pod")
 	flags.StringVar(&createOptions.InfraCommand, "infra-command", containerConfig.Engine.InfraCommand, "The command to run on the infra container when the pod is started")
 	flags.StringSliceVar(&labelFile, "label-file", []string{}, "Read in a line delimited file of labels")
@@ -83,6 +84,9 @@ func create(cmd *cobra.Command, args []string) error {
 
 	if !createOptions.Infra {
 		logrus.Debugf("Not creating an infra container")
+		if cmd.Flag("infra-conmon-pidfile").Changed {
+			return errors.New("cannot set infra-conmon-pid without an infra container")
+		}
 		if cmd.Flag("infra-command").Changed {
 			return errors.New("cannot set infra-command without an infra container")
 		}