Runsc checkpoint works.

This is the first iteration of checkpoint that actually saves to a file.
Tests for checkpoint are included.

Ran into an issue when private unix sockets are enabled. An error message
was added for this case and the mutex state was set.

PiperOrigin-RevId: 200269470
Change-Id: I28d29a9f92c44bf73dc4a4b12ae0509ee4070e93

1 files changed, 3 insertions, 2 deletions

diff --git a/runsc/container/container.go b/runsc/container/container.go
index 66a2f27a1..d323388fb 100644
--- a/runsc/container/container.go
+++ b/runsc/container/container.go
@@ -339,13 +339,14 @@ func (c *Container) Signal(sig syscall.Signal) error {
 }
 
 // Checkpoint sends the checkpoint call to the container.
-func (c *Container) Checkpoint() error {
+// The statefile will be written to f, the file at the specified image-path.
+func (c *Container) Checkpoint(f *os.File) error {
 	log.Debugf("Checkpoint container %q", c.ID)
 	if c.Status == Stopped {
 		log.Warningf("container %q not running, not checkpointing", c.ID)
 		return nil
 	}
-	return c.Sandbox.Checkpoint(c.ID)
+	return c.Sandbox.Checkpoint(c.ID, f)
 }
 
 // State returns the metadata of the container.