journald event logging

add the ability for podman to read and write events to journald instead
of just a logfile.  This can be controlled in libpod.conf with the
`events_logger` attribute of `journald` or `file`.  The default will be
set to `journald`.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/libpod/events/nullout.go b/libpod/events/nullout.go
new file mode 100644
index 000000000..7d811a9c7
--- /dev/null
+++ b/libpod/events/nullout.go
@@ -0,0 +1,23 @@
+package events
+
+// EventToNull is an eventer type that only performs write operations
+// and only writes to /dev/null. It is meant for unittests only
+type EventToNull struct{}
+
+// Write eats the event and always returns nil
+func (e EventToNull) Write(ee Event) error {
+	return nil
+}
+
+// Read does nothing. Do not use it.
+func (e EventToNull) Read(options ReadOptions) error {
+	return nil
+}
+
+// NewNullEventer returns a new null eventer.  You should only do this for
+// the purposes on internal libpod testing.
+func NewNullEventer() Eventer {
+	var e Eventer
+	e = EventToNull{}
+	return e
+}