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/dbus_service.cc b/dbus_service.cc
index 42bcfa3..956b73b 100644
--- a/dbus_service.cc
+++ b/dbus_service.cc
@@ -10,6 +10,7 @@
#include <base/logging.h>
#include <policy/device_policy.h>
+#include "update_engine/clock_interface.h"
#include "update_engine/connection_manager.h"
#include "update_engine/dbus_constants.h"
#include "update_engine/hardware_interface.h"
@@ -347,6 +348,20 @@
return TRUE;
}
+gboolean update_engine_service_get_duration_since_update(
+ UpdateEngineService* self,
+ gint64* out_usec_wallclock,
+ GError **/*error*/) {
+
+ base::Time time;
+ if (!self->system_state_->update_attempter()->GetBootTimeAtUpdate(&time))
+ return FALSE;
+
+ chromeos_update_engine::ClockInterface *clock = self->system_state_->clock();
+ *out_usec_wallclock = (clock->GetBootTime() - time).InMicroseconds();
+ return TRUE;
+}
+
gboolean update_engine_service_emit_status_update(
UpdateEngineService* self,
gint64 last_checked_time,