generate systemd: refactor

Refactor the systemd-unit generation code and move all the logic into
`pkg/systemd/generate`.  The code was already hard to maintain but I
found it impossible to wire the `--new` logic for pods in all the chaos.

The code refactoring in this commit will make maintaining the code
easier and should make it easier to extend as well.  Further changes and
refactorings may still be needed but they will easier.

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

1 files changed, 14 insertions, 0 deletions

diff --git a/libpod/pod.go b/libpod/pod.go
index db87e60f2..f53290876 100644
--- a/libpod/pod.go
+++ b/libpod/pod.go
@@ -257,6 +257,20 @@ func (p *Pod) InfraContainerID() (string, error) {
 	return p.state.InfraContainerID, nil
 }
 
+// InfraContainer returns the infra container.
+func (p *Pod) InfraContainer() (*Container, error) {
+	if !p.HasInfraContainer() {
+		return nil, errors.New("pod has no infra container")
+	}
+
+	id, err := p.InfraContainerID()
+	if err != nil {
+		return nil, err
+	}
+
+	return p.runtime.state.Container(id)
+}
+
 // TODO add pod batching
 // Lock pod to avoid lock contention
 // Store and lock all containers (no RemoveContainer in batch guarantees cache will not become stale)