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Disable AVD hacks by default

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This commit is contained in:
topjohnwu 2022-01-19 20:28:01 -08:00
parent 20ef724fad
commit 519bd2f30f
4 changed files with 27 additions and 7 deletions
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10
native/jni/init/init.hpp
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@ -2,6 +2,11 @@
using kv_pairs = std::vector<std::pair<std::string, std::string>>;
// For API 28 AVD, it uses legacy SAR setup that requires
// special hacks in magiskinit to work properly. We do not
// necessarily want this enabled in production builds.
#define ENABLE_AVD_HACK 0
struct BootConfig {
bool skip_initramfs;
bool force_normal_boot;
@ -67,9 +72,14 @@ protected:
mmap_data magisk_config;
std::string custom_rules_dir;
#if ENABLE_AVD_HACK
// When this boolean is set, this means we are currently
// running magiskinit on legacy SAR AVD emulator
bool avd_hack = false;
#else
// Make it const so compiler can optimize hacks out of the code
static const bool avd_hack = false;
#endif
void mount_with_dt();
bool patch_sepolicy(const char *file);

16
native/jni/init/mount.cpp
View File

@ -158,19 +158,21 @@ void MagiskInit::mount_with_dt() {
for (const auto &entry : fstab) {
if (is_lnk(entry.mnt_point.data()))
continue;
// When we force AVD to disable SystemAsRoot, it will always add system
// to dt fstab, which we actually have already mounted as root
if (avd_hack && entry.mnt_point == "/system")
if (avd_hack && entry.mnt_point == "/system") {
// When we force AVD to disable SystemAsRoot, it will always add system
// to dt fstab. We actually already mounted it as root, so skip this one.
continue;
}
// Derive partname from dev
sprintf(blk_info.partname, "%s%s", basename(entry.dev.data()), config->slot);
setup_block(true);
xmkdir(entry.mnt_point.data(), 0755);
xmount(blk_info.block_dev, entry.mnt_point.data(), entry.type.data(), MS_RDONLY, nullptr);
// When avd_hack is true, do not add any early mount partitions to mount_list
// as we will actually forcefully disable original init's early mount
if (!avd_hack)
if (!avd_hack) {
// When avd_hack is true, do not add any early mount partitions to mount_list
// as we will actually forcefully disable original init's early mount
mount_list.push_back(entry.mnt_point);
}
}
}
@ -379,7 +381,9 @@ void SARInit::early_mount() {
xmkdir("/dev", 0755);
xmount("tmpfs", "/dev", "tmpfs", 0, "mode=755");
mount_list.emplace_back("/dev");
#if ENABLE_AVD_HACK
avd_hack = config->emulator;
#endif
mount_with_dt();
}
}

2
scripts/avd_magisk.sh
View File

@ -16,7 +16,7 @@
# the official Android emulator (AVD) instead of a real device.
#
# This only covers the "core" features of Magisk. For testing
# magiskinit, please checkout avd_init.sh.
# magiskinit, please checkout avd_patch.sh.
#
#####################################################################

6
scripts/avd_patch.sh
View File

@ -14,6 +14,10 @@
# After patching ramdisk.img, close the emulator, then select
# "Cold Boot Now" in AVD Manager to force a full reboot.
#
# P.S. If running against the API 28 image, modify init.hpp and set
# ENABLE_AVD_HACK to 1 to enable special hacks designed specifically
# for this use case.
#
#####################################################################
# AVD Init Configurations:
#
@ -39,6 +43,8 @@ if [ -z "$FIRST_STAGE" ]; then
exec ./busybox sh $0
fi
pm install -r $(pwd)/app-debug.apk
# Extract files from APK
unzip -oj app-debug.apk 'assets/util_functions.sh'
. ./util_functions.sh