Cache OTA manifest in update_engine
When resuming download of an OTA package, update_engine needs to
redownload the manifest of OTA package, located at beginning of file.
However, the manifest blob can be as large as ~150K for some updates.
This CL caches manifest on disk, so that update engine no longer has to
redownload the manifest for every resume.
Test: Perform OTA, pause and resume, verify that update succeeds
Bug: 70736331
Change-Id: Iaf157ef57e68e4842d5867dea5467a3ab34f8286
diff --git a/common/constants.cc b/common/constants.cc
index fa13a38..c85ba54 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -108,6 +108,7 @@
const char kPrefsWallClockScatteringWaitPeriod[] = "wall-clock-wait-period";
const char kPrefsWallClockStagingWaitPeriod[] =
"wall-clock-staging-wait-period";
+const char kPrefsManifestBytes[] = "manifest-bytes";
// These four fields are generated by scripts/brillo_update_payload.
const char kPayloadPropertyFileSize[] = "FILE_SIZE";