Add event logging to libpod, even display to podman

In lipod, we now log major events that occurr.  These events
can be displayed using the `podman events` command. Each
event contains:

* Type (container, image, volume, pod...)
* Status (create, rm, stop, kill, ....)
* Timestamp in RFC3339Nano format
* Name (if applicable)
* Image (if applicable)

The format of the event and the varlink endpoint are to not
be considered stable until cockpit has done its enablement.

Signed-off-by: baude <bbaude@redhat.com>

libpod/container_api.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/containers/libpod/libpod/driver"
+	"github.com/containers/libpod/libpod/events"
 	"github.com/containers/libpod/pkg/inspect"
 	"github.com/containers/libpod/pkg/lookup"
 	"github.com/containers/storage/pkg/stringid"
@@ -88,6 +89,7 @@ func (c *Container) Start(ctx context.Context, recursive bool) (err error) {
 	}
 
 	// Start the container
+	defer c.newContainerEvent(events.Start)
 	return c.start()
 }
 
@@ -125,7 +127,8 @@ func (c *Container) StartAndAttach(ctx context.Context, streams *AttachStreams,
 		}
 		close(attachChan)
 	}()
-
+	c.newContainerEvent(events.Start)
+	c.newContainerEvent(events.Attach)
 	return attachChan, nil
 }
 
@@ -180,7 +183,7 @@ func (c *Container) StopWithTimeout(timeout uint) error {
 		c.state.State == ContainerStateExited {
 		return ErrCtrStopped
 	}
-
+	defer c.newContainerEvent(events.Stop)
 	return c.stop(timeout)
 }
 
@@ -198,7 +201,7 @@ func (c *Container) Kill(signal uint) error {
 	if c.state.State != ContainerStateRunning {
 		return errors.Wrapf(ErrCtrStateInvalid, "can only kill running containers")
 	}
-
+	defer c.newContainerEvent(events.Kill)
 	return c.runtime.ociRuntime.killContainer(c, signal)
 }
 
@@ -321,7 +324,7 @@ func (c *Container) Exec(tty, privileged bool, env, cmd []string, user, workDir
 		// TODO handle this better
 		return errors.Wrapf(err, "error saving exec sessions %s for container %s", sessionID, c.ID())
 	}
-
+	c.newContainerEvent(events.Exec)
 	logrus.Debugf("Successfully started exec session %s in container %s", sessionID, c.ID())
 
 	// Unlock so other processes can use the container
@@ -351,7 +354,6 @@ func (c *Container) Exec(tty, privileged bool, env, cmd []string, user, workDir
 	if err := c.save(); err != nil {
 		logrus.Errorf("Error removing exec session %s from container %s state: %v", sessionID, c.ID(), err)
 	}
-
 	return waitErr
 }
 
@@ -390,7 +392,7 @@ func (c *Container) Attach(streams *AttachStreams, keys string, resize <-chan re
 		c.state.State != ContainerStateExited {
 		return errors.Wrapf(ErrCtrStateInvalid, "can only attach to created or running containers")
 	}
-
+	defer c.newContainerEvent(events.Attach)
 	return c.attach(streams, keys, resize, false)
 }
 
@@ -405,7 +407,7 @@ func (c *Container) Mount() (string, error) {
 			return "", err
 		}
 	}
-
+	defer c.newContainerEvent(events.Mount)
 	return c.mount()
 }
 
@@ -435,6 +437,7 @@ func (c *Container) Unmount(force bool) error {
 			return errors.Wrapf(ErrInternal, "can't unmount %s last mount, it is still in use", c.ID())
 		}
 	}
+	defer c.newContainerEvent(events.Unmount)
 	return c.unmount(force)
 }
 
@@ -455,7 +458,7 @@ func (c *Container) Pause() error {
 	if c.state.State != ContainerStateRunning {
 		return errors.Wrapf(ErrCtrStateInvalid, "%q is not running, can't pause", c.state.State)
 	}
-
+	defer c.newContainerEvent(events.Pause)
 	return c.pause()
 }
 
@@ -473,7 +476,7 @@ func (c *Container) Unpause() error {
 	if c.state.State != ContainerStatePaused {
 		return errors.Wrapf(ErrCtrStateInvalid, "%q is not paused, can't unpause", c.ID())
 	}
-
+	defer c.newContainerEvent(events.Unpause)
 	return c.unpause()
 }
 
@@ -488,7 +491,7 @@ func (c *Container) Export(path string) error {
 			return err
 		}
 	}
-
+	defer c.newContainerEvent(events.Export)
 	return c.export(path)
 }
 
@@ -542,7 +545,6 @@ func (c *Container) Inspect(size bool) (*inspect.ContainerInspectData, error) {
 	if err != nil {
 		return nil, errors.Wrapf(err, "error getting graph driver info %q", c.ID())
 	}
-
 	return c.getContainerInspectData(size, driverData)
 }
 
@@ -574,6 +576,7 @@ func (c *Container) WaitWithInterval(waitTimeout time.Duration) (int32, error) {
 		return 0, err
 	}
 	exitCode := c.state.ExitCode
+	c.newContainerEvent(events.Wait)
 	return exitCode, nil
 }
 
@@ -597,7 +600,7 @@ func (c *Container) Cleanup(ctx context.Context) error {
 	if len(c.state.ExecSessions) != 0 {
 		return errors.Wrapf(ErrCtrStateInvalid, "container %s has active exec sessions, refusing to clean up", c.ID())
 	}
-
+	defer c.newContainerEvent(events.Cleanup)
 	return c.cleanup(ctx)
 }
 
@@ -667,7 +670,7 @@ func (c *Container) Sync() error {
 			}
 		}
 	}
-
+	defer c.newContainerEvent(events.Sync)
 	return nil
 }
 
@@ -772,7 +775,6 @@ func (c *Container) Refresh(ctx context.Context) error {
 			return err
 		}
 	}
-
 	return nil
 }
 
@@ -800,7 +802,7 @@ func (c *Container) Checkpoint(ctx context.Context, options ContainerCheckpointO
 			return err
 		}
 	}
-
+	defer c.newContainerEvent(events.Checkpoint)
 	return c.checkpoint(ctx, options)
 }
 
@@ -815,6 +817,6 @@ func (c *Container) Restore(ctx context.Context, options ContainerCheckpointOpti
 			return err
 		}
 	}
-
+	defer c.newContainerEvent(events.Restore)
 	return c.restore(ctx, options)
 }