first_stage_init: add hook to exec a shell script am: 2980ba4b3d (bfdeee95) · Commits · e / os / android_system_core

init/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,7 @@ init_device_sources = [
		"builtins.cpp",
		"devices.cpp",
		"firmware_handler.cpp",
		"first_stage_console.cpp",
		"first_stage_init.cpp",
		"first_stage_mount.cpp",
		"fscrypt_init_extensions.cpp",

init/Android.mk

+1 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,7 @@ LOCAL_CPPFLAGS := $(init_cflags)
		LOCAL_SRC_FILES := \
		block_dev_initializer.cpp \
		devices.cpp \
		first_stage_console.cpp \
		first_stage_init.cpp \
		first_stage_main.cpp \
		first_stage_mount.cpp \

init/first_stage_console.cpp

0 → 100644

+95 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#include "first_stage_console.h"

		#include <sys/stat.h>
		#include <sys/sysmacros.h>
		#include <sys/types.h>
		#include <sys/wait.h>
		#include <termios.h>

		#include <string>
		#include <thread>

		#include <android-base/chrono_utils.h>
		#include <android-base/file.h>
		#include <android-base/logging.h>

		static void RunScript() {
		LOG(INFO) << "Attempting to run /first_stage.sh...";
		pid_t pid = fork();
		if (pid != 0) {
		int status;
		waitpid(pid, &status, 0);
		LOG(INFO) << "/first_stage.sh exited with status " << status;
		return;
		}
		const char* path = "/system/bin/sh";
		const char* args[] = {path, "/first_stage.sh", nullptr};
		int rv = execv(path, const_cast<char**>(args));
		LOG(ERROR) << "unable to execv /first_stage.sh, returned " << rv << " errno " << errno;
		}

		namespace android {
		namespace init {

		void StartConsole() {
		if (mknod("/dev/console", S_IFCHR \| 0600, makedev(5, 1))) {
		PLOG(ERROR) << "unable to create /dev/console";
		return;
		}
		pid_t pid = fork();
		if (pid != 0) {
		int status;
		waitpid(pid, &status, 0);
		LOG(ERROR) << "console shell exited with status " << status;
		return;
		}
		int fd = -1;
		int tries = 50; // should timeout after 5s
		// The device driver for console may not be ready yet so retry for a while in case of failure.
		while (tries--) {
		fd = open("/dev/console", O_RDWR);
		if (fd != -1) {
		break;
		}
		std::this_thread::sleep_for(100ms);
		}
		if (fd == -1) {
		LOG(ERROR) << "Could not open /dev/console, errno = " << errno;
		_exit(127);
		}
		ioctl(fd, TIOCSCTTY, 0);
		dup2(fd, STDIN_FILENO);
		dup2(fd, STDOUT_FILENO);
		dup2(fd, STDERR_FILENO);
		close(fd);

		RunScript();
		const char* path = "/system/bin/sh";
		const char* args[] = {path, nullptr};
		int rv = execv(path, const_cast<char**>(args));
		LOG(ERROR) << "unable to execv, returned " << rv << " errno " << errno;
		_exit(127);
		}

		bool FirstStageConsole(const std::string& cmdline) {
		return cmdline.find("androidboot.first_stage_console=1") != std::string::npos;
		}

		} // namespace init
		} // namespace android

init/first_stage_console.h

0 → 100644

+28 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#pragma once

		#include <string>

		namespace android {
		namespace init {

		void StartConsole();
		bool FirstStageConsole(const std::string& cmdline);

		} // namespace init
		} // namespace android

init/first_stage_init.cpp

+1 −45

Original line number	Diff line number	Diff line
		@@ -24,12 +24,10 @@
		#include <sys/stat.h>
		#include <sys/sysmacros.h>
		#include <sys/types.h>
		#include <sys/wait.h>
		#include <unistd.h>

		#include <filesystem>
		#include <string>
		#include <thread>
		#include <vector>

		#include <android-base/chrono_utils.h>
		@@ -39,6 +37,7 @@
		#include <private/android_filesystem_config.h>

		#include "debug_ramdisk.h"
		#include "first_stage_console.h"
		#include "first_stage_mount.h"
		#include "reboot_utils.h"
		#include "switch_root.h"
		@@ -94,49 +93,6 @@ void FreeRamdisk(DIR* dir, dev_t dev) {
		}
		}

		void StartConsole() {
		if (mknod("/dev/console", S_IFCHR \| 0600, makedev(5, 1))) {
		PLOG(ERROR) << "unable to create /dev/console";
		return;
		}
		pid_t pid = fork();
		if (pid != 0) {
		int status;
		waitpid(pid, &status, 0);
		LOG(ERROR) << "console shell exited with status " << status;
		return;
		}
		int fd = -1;
		int tries = 50; // should timeout after 5s
		// The device driver for console may not be ready yet so retry for a while in case of failure.
		while (tries--) {
		fd = open("/dev/console", O_RDWR);
		if (fd != -1) {
		break;
		}
		std::this_thread::sleep_for(100ms);
		}
		if (fd == -1) {
		LOG(ERROR) << "Could not open /dev/console, errno = " << errno;
		_exit(127);
		}
		ioctl(fd, TIOCSCTTY, 0);
		dup2(fd, STDIN_FILENO);
		dup2(fd, STDOUT_FILENO);
		dup2(fd, STDERR_FILENO);
		close(fd);

		const char* path = "/system/bin/sh";
		const char* args[] = {path, nullptr};
		int rv = execv(path, const_cast<char**>(args));
		LOG(ERROR) << "unable to execv, returned " << rv << " errno " << errno;
		_exit(127);
		}

		bool FirstStageConsole(const std::string& cmdline) {
		return cmdline.find("androidboot.first_stage_console=1") != std::string::npos;
		}

		bool ForceNormalBoot(const std::string& cmdline) {
		return cmdline.find("androidboot.force_normal_boot=1") != std::string::npos;
		}