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/*
* Copyright (C) 2012 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 "adb_install.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/unique_fd.h>
#include "common.h"
#include "fuse_sideload.h"
#include "install.h"
#include "ui.h"
static void set_usb_driver(bool enabled) {
// USB configfs doesn't use /s/c/a/a/enable.
if (android::base::GetBoolProperty("sys.usb.configfs", false)) {
return;
}
static constexpr const char* USB_DRIVER_CONTROL = "/sys/class/android_usb/android0/enable";
android::base::unique_fd fd(open(USB_DRIVER_CONTROL, O_WRONLY));
if (fd == -1) {
PLOG(ERROR) << "Failed to open driver control";
return;
}
// Not using android::base::WriteStringToFile since that will open with O_CREAT and give EPERM
// when USB_DRIVER_CONTROL doesn't exist. When it gives EPERM, we don't know whether that's due
// to non-existent USB_DRIVER_CONTROL or indeed a permission issue.
if (!android::base::WriteStringToFd(enabled ? "1" : "0", fd)) {
PLOG(ERROR) << "Failed to set driver control";
}
}
static void stop_adbd() {
ui->Print("Stopping adbd...\n");
android::base::SetProperty("ctl.stop", "adbd");
set_usb_driver(false);
}
static void maybe_restart_adbd() {
if (is_ro_debuggable()) {
ui->Print("Restarting adbd...\n");
set_usb_driver(true);
android::base::SetProperty("ctl.start", "adbd");
}
}
int apply_from_adb(bool* wipe_cache, const char* install_file) {
modified_flash = true;
stop_adbd();
set_usb_driver(true);
ui->Print(
"\n\nNow send the package you want to apply\n"
"to the device with \"adb sideload <filename>\"...\n");
pid_t child;
if ((child = fork()) == 0) {
execl("/sbin/recovery", "recovery", "--adbd", nullptr);
_exit(EXIT_FAILURE);
}
// How long (in seconds) we wait for the host to start sending us a package, before timing out.
static constexpr int ADB_INSTALL_TIMEOUT = 300;
// FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the host connects and starts serving a
// package. Poll for its appearance. (Note that inotify doesn't work with FUSE.)
int result = INSTALL_ERROR;
int status;
bool waited = false;
for (int i = 0; i < ADB_INSTALL_TIMEOUT; ++i) {
if (waitpid(child, &status, WNOHANG) != 0) {
result = INSTALL_ERROR;
waited = true;
break;
}
struct stat st;
if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &st) != 0) {
if (errno == ENOENT && i < ADB_INSTALL_TIMEOUT - 1) {
sleep(1);
continue;
} else {
ui->Print("\nTimed out waiting for package.\n\n");
result = INSTALL_ERROR;
kill(child, SIGKILL);
break;
}
}
result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, install_file, false, 0);
break;
}
if (!waited) {
// Calling stat() on this magic filename signals the minadbd subprocess to shut down.
struct stat st;
stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &st);
// TODO: there should be a way to cancel waiting for a package (by pushing some button combo on
// the device). For now you just have to 'adb sideload' a file that's not a valid package, like
// "/dev/null".
waitpid(child, &status, 0);
}
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
if (WEXITSTATUS(status) == 3) {
ui->Print("\nYou need adb 1.0.32 or newer to sideload\nto this device.\n\n");
} else if (!WIFSIGNALED(status)) {
ui->Print("\n(adbd status %d)\n", WEXITSTATUS(status));
}
}
set_usb_driver(false);
maybe_restart_adbd();
return result;
}
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