persist.sys.boot.reason is cleared once read by bootstat
To ensure a surprise reboot does not take the last boot reason on
face value especially if coming from more than one boot sessions ago.
We shift and clear the value from persist.sys.boot.reason to
sys.boot.reason.last and establish a correct last reboot reason in
the canonical sys.boot.reason property. As a result, the power
manager should read the canonical sys.boot.reason for a definitive
result rather than relying on the possibly incorrect values in the
persistent storage. sys.boot.reason should be a core property as
it represents the canonical boot reason API.
Test: compile
Bug: 86671991
Bug: 63736262
Change-Id: If3742c487d6c0ab69c464f056bf48c786b66a945
diff --git a/private/system_server.te b/private/system_server.te
index f74159e..d3b8bcd 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -524,8 +524,8 @@
# BootReceiver to read ro.boot.bootreason
get_prop(system_server, bootloader_boot_reason_prop)
-# PowerManager to read persist.sys.boot.reason
-get_prop(system_server, last_boot_reason_prop)
+# PowerManager to read sys.boot.reason
+get_prop(system_server, system_boot_reason_prop)
# Collect metrics on boot time created by init
get_prop(system_server, boottime_prop)