Add D-Bus method to get the duration since an update completed.
This new API can be used by Chrome to automatically reboot the device
at N hours after updating. This is implemented as a D-Bus method that
returns the number of micro-seconds on the wall-clock since the update
completed. If the device has not updated, the D-Bus method returns an
error.
For robustness, durations are measured using the CLOCK_BOOTTIME clock
instead of the usual CLOCK_REALTIME clock. This avoids interference
with NTP adjustments, the RTC clock being wrong and other things.
BUG=chromium:218192
TEST=New unit test + unit tests pass + manual test on a device using
the gdbus(1) command as the chronos user.
Change-Id: I51d44d69afe2d3024bb0780916c3c4e3f8ebb19e
Reviewed-on: https://chromium-review.googlesource.com/173032
Reviewed-by: David Zeuthen <zeuthen@chromium.org>
Commit-Queue: David Zeuthen <zeuthen@chromium.org>
Tested-by: David Zeuthen <zeuthen@chromium.org>
diff --git a/update_engine.xml b/update_engine.xml
index ad6c36b..5a2b722 100644
--- a/update_engine.xml
+++ b/update_engine.xml
@@ -65,6 +65,9 @@
<method name="GetUpdateOverCellularPermission">
<arg type="b" name="allowed" direction="out" />
</method>
+ <method name="GetDurationSinceUpdate">
+ <arg type="x" name="usec_wallclock" direction="out" />
+ </method>
<signal name="StatusUpdate">
<arg type="x" name="last_checked_time" />
<arg type="d" name="progress" />