Make non-volatile directory platform-specific.
update_engine daemon needs to persist files (such as the progress of
the update) in a non-volatile storage and also used to store a
marker file on a volatile storage to detect when update_engine is
restarted, likelly due to a crash.
This patch moves the non-volatile directory configuration to the
Hardware interface, making it platform-specific. It also replaces the
system rebooted detection using the boot_id provided by the kernel
instead of storing a file under /tmp. This implementation works both
on Chrome OS and Android.
Bug: 24074252
Test: FEATURES=test emerge-link update_engine; `mma`; deployed and tested manually on brillo.
Change-Id: I921d767982adebfd04eb12e08d8a157d9102d1e3
diff --git a/constants.cc b/constants.cc
index 35ff835..d724564 100644
--- a/constants.cc
+++ b/constants.cc
@@ -23,18 +23,16 @@
const char kPowerwashCommand[] = "safe fast keepimg reason=update_engine\n";
-const char kPowerwashSafePrefsDir[] =
- "/mnt/stateful_partition/unencrypted/preserve/update_engine/prefs";
+const char kPowerwashSafePrefsSubDirectory[] = "update_engine/prefs";
-const char kPrefsDirectory[] = "/var/lib/update_engine/prefs";
+const char kPrefsSubDirectory[] = "prefs";
const char kStatefulPartition[] = "/mnt/stateful_partition";
-const char kSystemRebootedMarkerFile[] = "/tmp/update_engine_update_recorded";
-
// Constants defining keys for the persisted state of update engine.
const char kPrefsAttemptInProgress[] = "attempt-in-progress";
const char kPrefsBackoffExpiryTime[] = "backoff-expiry-time";
+const char kPrefsBootId[] = "boot-id";
const char kPrefsCertificateReportToSendDownload[] =
"certificate-report-to-send-download";
const char kPrefsCertificateReportToSendUpdate[] =