update_engine: Store fingerprint value from Omaha response.
Store the unique fp value from response into prefs. Value is later sent
to Omaha to determine if there is a subsequent update available
while the system is waiting to be rebooted.
BUG=b:161259884
TEST=cros_workon_make --board=hatch --test update_engine
Change-Id: Ie37aa5da3cd8a0820e633f5ef426fb50e8a02838
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/update_engine/+/2491618
Tested-by: Vyshu Khota <vyshu@google.com>
Commit-Queue: Vyshu Khota <vyshu@google.com>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
diff --git a/common/constants.cc b/common/constants.cc
index 8883668..a9cf238 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -71,6 +71,7 @@
const char kPrefsPingActive[] = "active";
const char kPrefsPingLastActive[] = "date_last_active";
const char kPrefsPingLastRollcall[] = "date_last_rollcall";
+const char kPrefsLastFp[] = "last-fp";
const char kPrefsPostInstallSucceeded[] = "post-install-succeeded";
const char kPrefsPreviousVersion[] = "previous-version";
const char kPrefsResumedUpdateFailures[] = "resumed-update-failures";