Small magiskinit cleanup

native/jni/init/init.cpp

@@ -209,30 +209,31 @@ int main(int argc, char *argv[]) {
 		return 1;
 	setup_klog();
 
-	unique_ptr<BaseInit> init;
+	BaseInit *init;
 	cmdline cmd{};
 
 	if (argc > 1 && argv[1] == "selinux_setup"sv) {
-		init = make_unique<SecondStageInit>(argv);
+		init = new SecondStageInit(argv);
 	} else {
 		// This will also mount /sys and /proc
 		load_kernel_info(&cmd);
 
-		if (access("/apex", F_OK) == 0) {
-			if (cmd.force_normal_boot)
-				init = make_unique<ForcedFirstStageInit>(argv, &cmd);
-			else if (cmd.skip_initramfs)
-				init = make_unique<SARFirstStageInit>(argv, &cmd);
+		bool two_stage = access("/apex", F_OK) == 0;
+		if (cmd.skip_initramfs) {
+			if (two_stage)
+				init = new SARFirstStageInit(argv, &cmd);
 			else
-				init = make_unique<FirstStageInit>(argv, &cmd);
-		} else if (cmd.skip_initramfs) {
-			init = make_unique<SARInit>(argv, &cmd);
+				init = new SARInit(argv, &cmd);
 		} else {
 			decompress_ramdisk();
-			if (access("/sbin/recovery", F_OK) == 0 || access("/system/bin/recovery", F_OK) == 0)
-				init = make_unique<RecoveryInit>(argv, &cmd);
+			if (cmd.force_normal_boot)
+				init = new FirstStageInit(argv, &cmd);
+			else if (access("/sbin/recovery", F_OK) == 0 || access("/system/bin/recovery", F_OK) == 0)
+				init = new RecoveryInit(argv, &cmd);
+			else if (two_stage)
+				init = new FirstStageInit(argv, &cmd);
 			else
-				init = make_unique<RootFSInit>(argv, &cmd);
+				init = new RootFSInit(argv, &cmd);
 		}
 	}
 

native/jni/init/init.hpp

@@ -31,9 +31,9 @@ struct raw_data {
 	}
 };
 
-/* *************
+/***************
  * Base classes
- * *************/
+ ***************/
 
 class BaseInit {
 protected:
@@ -41,9 +41,9 @@ protected:
 	char **argv;
 	std::vector<std::string> mount_list;
 
-	void exec_init(const char *init = "/init") {
+	void exec_init() {
 		cleanup();
-		execv(init, argv);
+		execv("/init", argv);
 		exit(1);
 	}
 	virtual void cleanup();
@@ -60,7 +60,7 @@ protected:
 	std::string persist_dir;
 
 	virtual void early_mount() = 0;
-	bool patch_sepolicy(const char *file = "/sepolicy");
+	bool patch_sepolicy(const char *file);
 public:
 	MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {}
 };
@@ -82,22 +82,9 @@ public:
 	}
 };
 
-/* *************
+/***************
  * 2 Stage Init
- * *************/
-
-class ForcedFirstStageInit : public BaseInit {
-private:
-	void prepare();
-public:
-	ForcedFirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {
-		LOGD("%s\n", __FUNCTION__);
-	};
-	void start() override {
-		prepare();
-		exec_init("/system/bin/init");
-	}
-};
+ ***************/
 
 class FirstStageInit : public BaseInit {
 private:
@@ -137,9 +124,9 @@ public:
 	};
 };
 
-/* ***********
+/*************
  * Legacy SAR
- * ***********/
+ *************/
 
 class SARInit : public SARBase {
 protected:
@@ -150,9 +137,9 @@ public:
 	};
 };
 
-/* **********
+/************
  * Initramfs
- * **********/
+ ************/
 
 class RootFSInit : public MagiskInit {
 private:

native/jni/init/rootdir.cpp

@@ -81,7 +81,7 @@ static void load_overlay_rc(const char *overlay) {
 }
 
 void RootFSInit::setup_rootfs() {
-	if (patch_sepolicy()) {
+	if (patch_sepolicy("/sepolicy")) {
 		char *addr;
 		size_t size;
 		mmap_rw("/init", addr, size);

native/jni/init/twostage.cpp

@@ -10,10 +10,10 @@
 
 using namespace std;
 
-static void patch_fstab(const string &fstab) {
-	string patched = fstab + ".p";
+static void patch_fstab(const char *fstab) {
+	string patched = fstab + ".p"s;
 	FILE *fp = xfopen(patched.data(), "we");
-	file_readline(fstab.data(), [=](string_view l) -> bool {
+	file_readline(fstab, [=](string_view l) -> bool {
 		if (l[0] == '#' || l.length() == 1)
 			return true;
 		char *line = (char *) l.data();
@@ -42,55 +42,38 @@ static void patch_fstab(const string &fstab) {
 	fclose(fp);
 
 	// Replace old fstab
-	clone_attr(fstab.data(), patched.data());
-	rename(patched.data(), fstab.data());
+	clone_attr(fstab, patched.data());
+	rename(patched.data(), fstab);
 }
 
 #define FSR "/first_stage_ramdisk"
 
-void ForcedFirstStageInit::prepare() {
-	// It is actually possible to NOT have FSR, create it just in case
-	xmkdir(FSR, 0755);
-
-	if (auto dir = xopen_dir(FSR); dir) {
-		string fstab(FSR "/");
-		for (dirent *de; (de = xreaddir(dir.get()));) {
-			if (strstr(de->d_name, "fstab")) {
-				fstab += de->d_name;
-				break;
-			}
-		}
-		if (fstab.length() == sizeof(FSR))
-			return;
-
-		patch_fstab(fstab);
-	} else {
-		return;
-	}
-
-	// Move stuffs for next stage
-	xmkdir(FSR "/system", 0755);
-	xmkdir(FSR "/system/bin", 0755);
+void FirstStageInit::prepare() {
+	if (cmd->force_normal_boot) {
+		xmkdirs(FSR "/system/bin", 0755);
 		rename("/init" /* magiskinit */, FSR "/system/bin/init");
 		symlink("/system/bin/init", FSR "/init");
 		rename("/.backup", FSR "/.backup");
 		rename("/overlay.d", FSR "/overlay.d");
-}
+		xsymlink("/system/bin/init", "/init");
 
-void FirstStageInit::prepare() {
-	auto dir = xopen_dir("/");
+		chdir(FSR);
+	} else {
+		xmkdir("/system", 0755);
+		xmkdir("/system/bin", 0755);
+		rename("/init" /* magiskinit */ , "/system/bin/init");
+		rename("/.backup/init", "/init");
+	}
+
+	// Patch fstab
+	auto dir = xopen_dir(".");
 	for (dirent *de; (de = xreaddir(dir.get()));) {
 		if (strstr(de->d_name, "fstab")) {
 			patch_fstab(de->d_name);
 			break;
 		}
 	}
-
-	// Move stuffs for next stage
-	xmkdir("/system", 0755);
-	xmkdir("/system/bin", 0755);
-	rename("/init" /* magiskinit */ , "/system/bin/init");
-	rename("/.backup/init", "/init");
+	chdir("/");
 }
 
 static inline long xptrace(int request, pid_t pid, void *addr, void *data) {