core: add RemainAfterElapse= setting to timer units

Previously, after a timer unit elapsed we'd leave it around for good,
which has the nice benefit that starting a timer that shall trigger at a
specific point in time multiple times will only result in one trigger
instead of possibly many. With this change a new option
RemainAfterElapse= is added. It defaults to "true", to mimic the old
behaviour. If set to "false" timer units will be unloaded after they
elapsed. This is specifically useful for transient timer units.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/core/timer.h b/src/core/timer.h
index ac5af6a93c..6bc9fbed3d 100644
--- a/src/core/timer.h
+++ b/src/core/timer.h
@@ -73,6 +73,7 @@ struct Timer {
 
         bool persistent;
         bool wake_system;
+        bool remain_after_elapse;
 
         char *stamp_path;
 };