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BYD XDJA container support #6743

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Aug 20, 2024
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BYD XDJA container support #6743

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80 changes: 58 additions & 22 deletions native/src/init/rootdir.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,10 +12,31 @@
using namespace std;

static vector<string> rc_list;
static string magic_mount_list;

#define NEW_INITRC_DIR "/system/etc/init/hw"
#define INIT_RC "init.rc"

static void magic_mount(const string &sdir, const string &ddir = "") {
auto dir = xopen_dir(sdir.data());
if (!dir) return;
for (dirent *entry; (entry = xreaddir(dir.get()));) {
string src = sdir + "/" + entry->d_name;
string dest = ddir + "/" + entry->d_name;
if (access(dest.data(), F_OK) == 0) {
if (entry->d_type == DT_DIR) {
// Recursive
magic_mount(src, dest);
} else {
LOGD("Mount [%s] -> [%s]\n", src.data(), dest.data());
xmount(src.data(), dest.data(), nullptr, MS_BIND, nullptr);
magic_mount_list += dest;
magic_mount_list += '\n';
}
}
}
}

static void patch_rc_scripts(const char *src_path, const char *tmp_path, bool writable) {
auto src_dir = xopen_dir(src_path);
if (!src_dir) return;
Expand Down Expand Up @@ -105,6 +126,43 @@ static void patch_rc_scripts(const char *src_path, const char *tmp_path, bool wr
});
fclone_attr(fileno(src.get()), fileno(dest.get()));
}

if (faccessat(src_fd, "init.fission_host.rc", F_OK, 0) == 0) {
{
LOGD("Patching fissiond\n");
mmap_data fissiond("/system/bin/fissiond", false);
for (size_t off : fissiond.patch("ro.build.system.fission_single_os", "ro.build.system.xxxxxxxxxxxxxxxxx")) {
LOGD("Patch @ %08zX [ro.build.system.fission_single_os] -> [ro.build.system.xxxxxxxxxxxxxxxxx]\n", off);
}
mkdirs(ROOTOVL "/system/bin", 0755);
if (auto target_fissiond = xopen_file(ROOTOVL "/system/bin/fissiond", "we")) {
fwrite(fissiond.buf(), 1, fissiond.sz(), target_fissiond.get());
clone_attr("/system/bin/fissiond", ROOTOVL "/system/bin/fissiond");
}
}
LOGD("hijack isolated\n");
auto hijack = xopen_file("/sys/devices/system/cpu/isolated", "re");
mkfifo(INTLROOT "/isolated", 0777);
xmount(INTLROOT "/isolated", "/sys/devices/system/cpu/isolated", nullptr, MS_BIND, nullptr);
if (!xfork()) {
auto dest = xopen_file(INTLROOT "/isolated", "we");
LOGD("hijacked isolated\n");
xumount2("/sys/devices/system/cpu/isolated", MNT_DETACH);
unlink(INTLROOT "/isolated");
string content;
full_read(fileno(hijack.get()), content);
{
string target = "/dev/cells/cell2"s + tmp_path;
xmkdirs(target.data(), 0);
xmount(tmp_path, target.data(), nullptr, MS_BIND | MS_REC,nullptr);
magic_mount(ROOTOVL, "/dev/cells/cell2");
auto mount = xopen_file(ROOTMNT, "w");
fwrite(magic_mount_list.data(), 1, magic_mount_list.length(), mount.get());
}
fprintf(dest.get(), "%s", content.data());
exit(0);
}
}
}

static void load_overlay_rc(const char *overlay) {
Expand Down Expand Up @@ -164,28 +222,6 @@ static void recreate_sbin(const char *mirror, bool use_bind_mount) {
}
}

static string magic_mount_list;

static void magic_mount(const string &sdir, const string &ddir = "") {
auto dir = xopen_dir(sdir.data());
if (!dir) return;
for (dirent *entry; (entry = xreaddir(dir.get()));) {
string src = sdir + "/" + entry->d_name;
string dest = ddir + "/" + entry->d_name;
if (access(dest.data(), F_OK) == 0) {
if (entry->d_type == DT_DIR) {
// Recursive
magic_mount(src, dest);
} else {
LOGD("Mount [%s] -> [%s]\n", src.data(), dest.data());
xmount(src.data(), dest.data(), nullptr, MS_BIND, nullptr);
magic_mount_list += dest;
magic_mount_list += '\n';
}
}
}
}

static void extract_files(bool sbin) {
const char *magisk_xz = sbin ? "/sbin/magisk.xz" : "magisk.xz";
const char *stub_xz = sbin ? "/sbin/stub.xz" : "stub.xz";
Expand Down