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>

3 files changed, 16 insertions, 0 deletions

diff --git a/libpod/options.go b/libpod/options.go
index 75d098815..5a0f60093 100644
--- a/libpod/options.go
+++ b/libpod/options.go
@@ -1550,6 +1550,18 @@ func WithPodCreateCommand() PodCreateOption {
 	}
 }
 
+// WithInfraConmonPidFile sets the path to a custom conmon PID file for the
+// infra container.
+func WithInfraConmonPidFile(path string) PodCreateOption {
+	return func(pod *Pod) error {
+		if pod.valid {
+			return define.ErrPodFinalized
+		}
+		pod.config.InfraContainer.ConmonPidFile = path
+		return nil
+	}
+}
+
 // WithPodLabels sets the labels of a pod.
 func WithPodLabels(labels map[string]string) PodCreateOption {
 	return func(pod *Pod) error {
diff --git a/libpod/pod.go b/libpod/pod.go
index 38fe1fd2c..7af78fa07 100644
--- a/libpod/pod.go
+++ b/libpod/pod.go
@@ -83,6 +83,7 @@ type podState struct {
 
 // InfraContainerConfig is the configuration for the pod's infra container
 type InfraContainerConfig struct {
+	ConmonPidFile      string               `json:"conmonPidFile"`
 	HasInfraContainer  bool                 `json:"makeInfraContainer"`
 	HostNetwork        bool                 `json:"infraHostNetwork,omitempty"`
 	PortBindings       []ocicni.PortMapping `json:"infraPortBindings"`
diff --git a/libpod/runtime_pod_infra_linux.go b/libpod/runtime_pod_infra_linux.go
index 06a7b3936..a0dee3aa1 100644
--- a/libpod/runtime_pod_infra_linux.go
+++ b/libpod/runtime_pod_infra_linux.go
@@ -130,6 +130,9 @@ func (r *Runtime) makeInfraContainer(ctx context.Context, p *Pod, imgName, rawIm
 	options = append(options, WithRootFSFromImage(imgID, imgName, rawImageName))
 	options = append(options, WithName(containerName))
 	options = append(options, withIsInfra())
+	if len(p.config.InfraContainer.ConmonPidFile) > 0 {
+		options = append(options, WithConmonPidFile(p.config.InfraContainer.ConmonPidFile))
+	}
 
 	return r.newContainer(ctx, g.Config, options...)
 }