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init: loading debug resources before chroot into first_stage_ramdisk

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Currently the debug resources might under /first_stage_ramdisk/*
of the ramdisk, if there is androidboot.force_normal_boot=1 in the
kernel cmdline to request init chroot into /first_stage_ramdisk dir.

To make a generic boot-debug.img works on devices with and without
this chroot, moving the debug resources to the root of the ramdisk.
And copy them for later use before the chroot.

Bug: 186082603
Test: boot a device with boot-debug.img
Test: boot a device with vendor_boot-debug.img
Change-Id: I052a92b2d26c7fdf749991fc55015ff68743efc2
This commit is contained in:
Bowgo Tsai 2021-04-23 11:16:58 +08:00
parent 9596d062f5
commit 64e92f946f
1 changed files with 13 additions and 22 deletions
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35
init/first_stage_init.cpp
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@ -327,6 +327,19 @@ int FirstStageMain(int argc, char** argv) {
LOG(INFO) << "Copied ramdisk prop to " << dest;
}
// If "/force_debuggable" is present, the second-stage init will use a userdebug
// sepolicy and load adb_debug.prop to allow adb root, if the device is unlocked.
if (access("/force_debuggable", F_OK) == 0) {
std::error_code ec; // to invoke the overloaded copy_file() that won't throw.
if (!fs::copy_file("/adb_debug.prop", kDebugRamdiskProp, ec) ||
!fs::copy_file("/userdebug_plat_sepolicy.cil", kDebugRamdiskSEPolicy, ec)) {
LOG(ERROR) << "Failed to setup debug ramdisk";
} else {
// setenv for second-stage init to read above kDebugRamdisk* files.
setenv("INIT_FORCE_DEBUGGABLE", "true", 1);
}
}
if (ForceNormalBoot(cmdline, bootconfig)) {
mkdir("/first_stage_ramdisk", 0755);
// SwitchRoot() must be called with a mount point as the target, so we bind mount the
@ -337,28 +350,6 @@ int FirstStageMain(int argc, char** argv) {
SwitchRoot("/first_stage_ramdisk");
}
std::string force_debuggable("/force_debuggable");
std::string adb_debug_prop("/adb_debug.prop");
std::string userdebug_sepolicy("/userdebug_plat_sepolicy.cil");
if (IsRecoveryMode()) {
// Update these file paths since we didn't switch root
force_debuggable.insert(0, "/first_stage_ramdisk");
adb_debug_prop.insert(0, "/first_stage_ramdisk");
userdebug_sepolicy.insert(0, "/first_stage_ramdisk");
}
// If this file is present, the second-stage init will use a userdebug sepolicy
// and load adb_debug.prop to allow adb root, if the device is unlocked.
if (access(force_debuggable.c_str(), F_OK) == 0) {
std::error_code ec; // to invoke the overloaded copy_file() that won't throw.
if (!fs::copy_file(adb_debug_prop, kDebugRamdiskProp, ec) ||
!fs::copy_file(userdebug_sepolicy, kDebugRamdiskSEPolicy, ec)) {
LOG(ERROR) << "Failed to setup debug ramdisk";
} else {
// setenv for second-stage init to read above kDebugRamdisk* files.
setenv("INIT_FORCE_DEBUGGABLE", "true", 1);
}
}
if (!DoFirstStageMount(!created_devices)) {
LOG(FATAL) << "Failed to mount required partitions early ...";
}