PawletOS/android_bootable_recovery
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Implement autodetection for SAR, based on the installed system

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This will detect whether SAR is present in the currently installed
OS and set the property ro.twrp.sar accordingly.
After setting the property it will call the bootscript
/sbin/sarsetup.sh (if present) to give device maintainers the
option to do setup operations depending on SAR-status, such
as modifiyng the fstab.

If no system is detected and AB_OTA_UPDATER is defined or built with
Android 10 and upwards, it will fallback to using SAR, otherwise it
will use ro.build.system_root_image as basis for deciding whether SAR
is required or not.

The property ro.twrp.sar will also be used by
TWPartitionManager::Get_Android_Root_Path()

This allows maintaining a single TWRP-build for devices switching
to SAR for Android 10.

The default behavior (when no system is installed)
is determined by the build-flags AB_OTA_UPDATER and
BOARD_BUILD_SYSTEM_ROOT_IMAGE

Change-Id: I2a48c6c81a6ea6fad6e452c06bfbe4d9da0f1e5c
This commit is contained in:
Chaosmaster
2020-05-10 15:43:56 -04:00
committed by bigbiff
parent da97480567
commit f6e42ce390
4 changed files with 80 additions and 15 deletions
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twrp.cpp
+43 -1
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@@ -117,8 +117,50 @@ int main(int argc, char **argv) {
if (!TWFunc::Path_Exists(fstab_filename)) {
fstab_filename = "/etc/recovery.fstab";
}
// Begin SAR detection
{
TWPartitionManager SarPartitionManager;
printf("=> Processing %s for SAR-detection\n", fstab_filename.c_str());
if (!SarPartitionManager.Process_Fstab(fstab_filename, 1, 1)) {
LOGERR("Failing out of recovery due to problem with fstab.\n");
return -1;
}
mkdir("/s", 0755);
#if defined(AB_OTA_UPDATER) || defined(__ANDROID_API_Q__)
bool fallback_sar = true;
#else
bool fallback_sar = property_get_bool("ro.build.system_root_image", false);
#endif
if(SarPartitionManager.Mount_By_Path("/s", false)) {
if (TWFunc::Path_Exists("/s/build.prop")) {
LOGINFO("SAR-DETECT: Non-SAR System detected\n");
property_set("ro.twrp.sar", "0");
rmdir("/system_root");
} else if (TWFunc::Path_Exists("/s/system/build.prop")) {
LOGINFO("SAR-DETECT: SAR System detected\n");
property_set("ro.twrp.sar", "1");
} else {
LOGINFO("SAR-DETECT: No build.prop found, falling back to %s\n", fallback_sar ? "SAR" : "Non-SAR");
property_set("ro.twrp.sar", fallback_sar ? "1" : "0");
}
SarPartitionManager.UnMount_By_Path("/s", false);
} else {
LOGINFO("SAR-DETECT: Could not mount system partition, falling back to %s\n", fallback_sar ? "SAR":"Non-SAR");
property_set("ro.twrp.sar", fallback_sar ? "1" : "0");
}
rmdir("/s");
TWFunc::check_and_run_script("/sbin/sarsetup.sh", "boot");
}
// End SAR detection
printf("=> Processing %s\n", fstab_filename.c_str());
if (!PartitionManager.Process_Fstab(fstab_filename, 1)) {
if (!PartitionManager.Process_Fstab(fstab_filename, 1, 0)) {
LOGERR("Failing out of recovery due to problem with fstab.\n");
return -1;
}