Added optional container restore statistics

This adds the parameter '--print-stats' to 'podman container restore'.
With '--print-stats' Podman will measure how long Podman itself, the OCI
runtime and CRIU requires to restore a checkpoint and print out these
information. CRIU already creates process restore statistics which are
just read in addition to the added measurements. In contrast to just
printing out the ID of the restored container, Podman will now print
out JSON:

 # podman container restore --latest --print-stats
 {
     "podman_restore_duration": 305871,
     "container_statistics": [
         {
             "Id": "47b02e1d474b5d5fe917825e91ac653efa757c91e5a81a368d771a78f6b5ed20",
             "runtime_restore_duration": 140614,
             "criu_statistics": {
                 "forking_time": 5,
                 "restore_time": 67672,
                 "pages_restored": 14
             }
         }
     ]
 }

The output contains 'podman_restore_duration' which contains the
number of microseconds Podman required to restore the checkpoint. The
output also includes 'runtime_restore_duration' which is the time
the runtime needed to restore that specific container. Each container
also includes 'criu_statistics' which displays the timing information
collected by CRIU.

Signed-off-by: Adrian Reber <areber@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index de23a4aeb..4bf15be86 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -1089,7 +1089,7 @@ func (c *Container) init(ctx context.Context, retainRetries bool) error {
 	}
 
 	// With the spec complete, do an OCI create
-	if err := c.ociRuntime.CreateContainer(c, nil); err != nil {
+	if _, err = c.ociRuntime.CreateContainer(c, nil); err != nil {
 		// Fedora 31 is carrying a patch to display improved error
 		// messages to better handle the V2 transition. This is NOT
 		// upstream in any OCI runtime.