Added a resume command to unpause a paused container.

Resume checks the status of the container and unpauses the kernel
if its status is paused. Otherwise nothing happens.
Tests were added to ensure that the process is in the correct state
after various commands.

PiperOrigin-RevId: 201251234
Change-Id: Ifd11b336c33b654fea6238738f864fcf2bf81e19

1 files changed, 10 insertions, 1 deletions

diff --git a/runsc/boot/controller.go b/runsc/boot/controller.go
index 564f2d271..ae727f144 100644
--- a/runsc/boot/controller.go
+++ b/runsc/boot/controller.go
@@ -44,6 +44,9 @@ const (
 	// processes running in a container.
 	ContainerProcesses = "containerManager.Processes"
 
+	// ContainerResume unpauses the paused container.
+	ContainerResume = "containerManager.Resume"
+
 	// ContainerSignal is used to send a signal to a container.
 	ContainerSignal = "containerManager.Signal"
 
@@ -156,12 +159,18 @@ func (cm *containerManager) Checkpoint(o *control.SaveOpts, _ *struct{}) error {
 	return state.Save(o, nil)
 }
 
-// Pause suspends the process in a container.
+// Pause suspends a container.
 func (cm *containerManager) Pause(_, _ *struct{}) error {
 	cm.k.Pause()
 	return nil
 }
 
+// Resume unpauses a container.
+func (cm *containerManager) Resume(_, _ *struct{}) error {
+	cm.k.Unpause()
+	return nil
+}
+
 // Wait waits for the init process in the given container.
 func (cm *containerManager) Wait(cid *string, waitStatus *uint32) error {
 	// TODO: Use the cid and wait on the init process in that