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bootstat: enhance last reboot reason property with file backing

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Helps with support of recovery and rollback boot reason history, by
also using /metadata/bootstat/persist.sys.boot.reason to file the
reboot reason.

Test: manual
Bug: 129007837
Change-Id: Id1d21c404067414847bef14a0c43f70cafe1a3e2
This commit is contained in:
Mark Salyzyn 2019-05-23 10:00:34 -07:00
parent e6f2b7d884
commit ee016ce0b3
4 changed files with 12 additions and 2 deletions
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11
bootstat/bootstat.cpp
View file

@ -870,6 +870,7 @@ bool addKernelPanicSubReason(const std::string& content, std::string& ret) {
const char system_reboot_reason_property[] = "sys.boot.reason";
const char last_reboot_reason_property[] = LAST_REBOOT_REASON_PROPERTY;
const char last_reboot_reason_file[] = LAST_REBOOT_REASON_FILE;
const char last_last_reboot_reason_property[] = "sys.boot.reason.last";
constexpr size_t history_reboot_reason_size = 4;
const char history_reboot_reason_property[] = LAST_REBOOT_REASON_PROPERTY ".history";
@ -1059,7 +1060,9 @@ std::string BootReasonStrToReason(const std::string& boot_reason) {
if (isBluntRebootReason(ret)) {
// Content buffer no longer will have console data. Beware if more
// checks added below, that depend on parsing console content.
content = android::base::GetProperty(last_reboot_reason_property, "");
if (!android::base::ReadFileToString(last_reboot_reason_file, &content)) {
content = android::base::GetProperty(last_reboot_reason_property, "");
}
transformReason(content);
// Anything in last is better than 'super-blunt' reboot or shutdown.
@ -1233,7 +1236,10 @@ void SetSystemBootReason() {
// Record the scrubbed system_boot_reason to the property
BootReasonAddToHistory(system_boot_reason);
// Shift last_reboot_reason_property to last_last_reboot_reason_property
auto last_boot_reason = android::base::GetProperty(last_reboot_reason_property, "");
std::string last_boot_reason;
if (!android::base::ReadFileToString(last_reboot_reason_file, &last_boot_reason)) {
last_boot_reason = android::base::GetProperty(last_reboot_reason_property, "");
}
if (last_boot_reason.empty() || isKernelRebootReason(system_boot_reason)) {
last_boot_reason = system_boot_reason;
} else {
@ -1241,6 +1247,7 @@ void SetSystemBootReason() {
}
android::base::SetProperty(last_last_reboot_reason_property, last_boot_reason);
android::base::SetProperty(last_reboot_reason_property, "");
unlink(last_reboot_reason_file);
}
// Gets the boot time offset. This is useful when Android is running in a

1
init/reboot.cpp
View file

@ -548,6 +548,7 @@ static void DoReboot(unsigned int cmd, const std::string& reason, const std::str
skip = strlen("reboot,");
}
SetProperty(LAST_REBOOT_REASON_PROPERTY, reason.c_str() + skip);
WriteStringToFile(reason.c_str() + skip, LAST_REBOOT_REASON_FILE);
sync();
bool is_thermal_shutdown = cmd == ANDROID_RB_THERMOFF;

1
libcutils/include/cutils/android_reboot.h
View file

@ -31,6 +31,7 @@ __BEGIN_DECLS
/* Android reboot reason stored in this property */
#define LAST_REBOOT_REASON_PROPERTY "persist.sys.boot.reason"
#define LAST_REBOOT_REASON_FILE "/metadata/bootstat/" LAST_REBOOT_REASON_PROPERTY
/* Reboot or shutdown the system.
* This call uses ANDROID_RB_PROPERTY to request reboot to init process.

1
rootdir/init.rc
View file

@ -496,6 +496,7 @@ on post-fs
mkdir /metadata/vold
chmod 0700 /metadata/vold
mkdir /metadata/password_slots 0771 root system
mkdir /metadata/bootstat 0750 system log
mkdir /metadata/ota 0700 root system
mkdir /metadata/ota/snapshots 0700 root system