text: /*
   * 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 <unistd.h>
  #include <dirent.h>
  #include <errno.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/types.h>
  #include <sys/wait.h>
  #include <sys/stat.h>
  #include <signal.h>
  #include <fcntl.h>
  
  #include "ui.h"
  #include "cutils/properties.h"
  #include "install.h"
  #include "common.h"
  #include "adb_install.h"
  extern "C" {
  #include "minadbd/fuse_adb_provider.h"
  #include "fuse_sideload.h"
  }
  
  static RecoveryUI* ui = NULL;
  
  static void
  set_usb_driver(bool enabled) {
      int fd = open("/sys/class/android_usb/android0/enable", O_WRONLY);
      if (fd < 0) {
          ui->Print("failed to open driver control: %s\n", strerror(errno));
          return;
      }
      if (write(fd, enabled ? "1" : "0", 1) < 0) {
          ui->Print("failed to set driver control: %s\n", strerror(errno));
      }
      if (close(fd) < 0) {
          ui->Print("failed to close driver control: %s\n", strerror(errno));
      }
  }
  
  static void
  stop_adbd() {
      property_set("ctl.stop", "adbd");
      set_usb_driver(false);
  }
  
  
  static void
  maybe_restart_adbd() {
      char value[PROPERTY_VALUE_MAX+1];
      int len = property_get("ro.debuggable", value, NULL);
      if (len == 1 && value[0] == '1') {
          ui->Print("Restarting adbd...\n");
          set_usb_driver(true);
          property_set("ctl.start", "adbd");
      }
  }
  
  // How long (in seconds) we wait for the host to start sending us a
  // package, before timing out.
  #define ADB_INSTALL_TIMEOUT 300
  
  int
  apply_from_adb(RecoveryUI* ui_, int* wipe_cache, const char* install_file) {
      ui = ui_;
  
      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", NULL);
          _exit(-1);
      }
  
      // 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;
      int status;
      bool waited = false;
      struct stat st;
      for (int i = 0; i < ADB_INSTALL_TIMEOUT; ++i) {
          if (waitpid(child, &status, WNOHANG) != 0) {
              result = INSTALL_ERROR;
              waited = true;
              break;
          }
  
          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", strerror(errno));
                  result = INSTALL_ERROR;
                  kill(child, SIGKILL);
                  break;
              }
          }
          result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, install_file, false);
          break;
      }
  
      if (!waited) {
          // Calling stat() on this magic filename signals the minadbd
          // subprocess to shut down.
          stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &st);
  
          // TODO(dougz): 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;
  }
  