commit a65fced5f4c2b551616b26ee90a800b44090735f
author Gilad Arnold <garnold@chromium.org> Wed Jul 23 09:01:31 2014 -0700
committer chrome-internal-fetch <chrome-internal-fetch@google.com> Fri Jul 25 03:41:05 2014 +0000
tree eb519f3b860f3be0c1142e6949cf03d0d2bbedc1
parent 5d5278068a007fc090368fba664fe130645880f7

update_engine: UM: Add check for monotonic time elapsed.

This forks the former EvaluationStatus::IsTimeGreaterThan() into two
separate variants, checking either the wallclock or monotonic current
time against a corresponding timestamp. This is needed for policies that
require resilience against wallclock time volatility.

BUG=chromium:394778
TEST=Unit tests.

Change-Id: I9ecd20cc87a3a520e119f157e55ae4f54104a506
Reviewed-on: https://chromium-review.googlesource.com/209487
Commit-Queue: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Gilad Arnold <garnold@chromium.org>

update_manager/chromeos_policy.cc

diff --git a/update_manager/chromeos_policy.cc b/update_manager/chromeos_policy.cc
index cba74e2..c49e3a7 100644
--- a/update_manager/chromeos_policy.cc
+++ b/update_manager/chromeos_policy.cc
@@ -211,7 +211,7 @@
       EvalStatus::kSucceeded) {
     return EvalStatus::kFailed;
   }
-  if (!ec->IsTimeGreaterThan(next_update_check))
+  if (!ec->IsWallclockTimeGreaterThan(next_update_check))
     return EvalStatus::kAskMeAgainLater;
 
   // It is time to check for an update.
@@ -604,7 +604,7 @@
   // the update, then no wait is needed.
   Time wait_expires = (update_state.first_seen +
                        min(wait_period, update_state.scatter_wait_period_max));
-  if (ec->IsTimeGreaterThan(wait_expires))
+  if (ec->IsWallclockTimeGreaterThan(wait_expires))
     wait_period = kZeroInterval;
 
   // Step 2: Maintain the update check threshold count.