Fix resuming canceled updates.
Resuming an interrupted update was broken in several ways. First,
DeltaPerformer::CanResumeUpdate was checking for the number of
resume-failures to be more than the limit, not less. Then, the
resume logic didn't work for payload v2 when there was a
metadata signature included in the payload. Finally, resuming an
update after reading the payload signature (in payload v2) was not
updating the checkpoint, but storing the signature causing it to
attempt to parse it again and fail.
Bug: 27047026
Bug: chromium:590410
TEST=Manual procedure:
1. Start an update: update_engine_client --update ...
2. Cancel the update: update_engine_client --cancel
3. Re-start the same update: update_engine_client --update ...
-> The update should resume from the previous point.
Change-Id: I60134de155aa073a7ba91174cceea7297e5f8d17
diff --git a/common/constants.h b/common/constants.h
index 62f61ce..f9a43c6 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -50,6 +50,7 @@
extern const char kPrefsLastActivePingDay[];
extern const char kPrefsLastRollCallPingDay[];
extern const char kPrefsManifestMetadataSize[];
+extern const char kPrefsManifestSignatureSize[];
extern const char kPrefsMetricsAttemptLastReportingTime[];
extern const char kPrefsMetricsCheckLastReportingTime[];
extern const char kPrefsNumReboots[];