Home | History | Annotate | Download | only in recovery 
      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <unistd.h>
     18 #include <dirent.h>
     19 #include <errno.h>
     20 #include <stdlib.h>
     21 #include <string.h>
     22 #include <sys/types.h>
     23 #include <sys/wait.h>
     24 #include <sys/stat.h>
     25 #include <signal.h>
     26 #include <fcntl.h>
     27 
     28 #include "ui.h"
     29 #include "install.h"
     30 #include "common.h"
     31 #include "adb_install.h"
     32 #include "minadbd/fuse_adb_provider.h"
     33 #include "fuse_sideload.h"
     34 
     35 #include <android-base/properties.h>
     36 
     37 static void set_usb_driver(RecoveryUI* ui, bool enabled) {
     38     int fd = open("/sys/class/android_usb/android0/enable", O_WRONLY);
     39     if (fd < 0) {
     40         ui->Print("failed to open driver control: %s\n", strerror(errno));
     41         return;
     42     }
     43     if (TEMP_FAILURE_RETRY(write(fd, enabled ? "1" : "0", 1)) == -1) {
     44         ui->Print("failed to set driver control: %s\n", strerror(errno));
     45     }
     46     if (close(fd) < 0) {
     47         ui->Print("failed to close driver control: %s\n", strerror(errno));
     48     }
     49 }
     50 
     51 static void stop_adbd(RecoveryUI* ui) {
     52     ui->Print("Stopping adbd...\n");
     53     android::base::SetProperty("ctl.stop", "adbd");
     54     set_usb_driver(ui, false);
     55 }
     56 
     57 static void maybe_restart_adbd(RecoveryUI* ui) {
     58     if (is_ro_debuggable()) {
     59         ui->Print("Restarting adbd...\n");
     60         set_usb_driver(ui, true);
     61         android::base::SetProperty("ctl.start", "adbd");
     62     }
     63 }
     64 
     65 // How long (in seconds) we wait for the host to start sending us a
     66 // package, before timing out.
     67 #define ADB_INSTALL_TIMEOUT 300
     68 
     69 int apply_from_adb(RecoveryUI* ui, bool* wipe_cache, const char* install_file) {
     70     modified_flash = true;
     71 
     72     stop_adbd(ui);
     73     set_usb_driver(ui, true);
     74 
     75     ui->Print("\n\nNow send the package you want to apply\n"
     76               "to the device with \"adb sideload <filename>\"...\n");
     77 
     78     pid_t child;
     79     if ((child = fork()) == 0) {
     80         execl("/sbin/recovery", "recovery", "--adbd", NULL);
     81         _exit(EXIT_FAILURE);
     82     }
     83 
     84     // FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the host
     85     // connects and starts serving a package.  Poll for its
     86     // appearance.  (Note that inotify doesn't work with FUSE.)
     87     int result = INSTALL_ERROR;
     88     int status;
     89     bool waited = false;
     90     struct stat st;
     91     for (int i = 0; i < ADB_INSTALL_TIMEOUT; ++i) {
     92         if (waitpid(child, &status, WNOHANG) != 0) {
     93             result = INSTALL_ERROR;
     94             waited = true;
     95             break;
     96         }
     97 
     98         if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &st) != 0) {
     99             if (errno == ENOENT && i < ADB_INSTALL_TIMEOUT-1) {
    100                 sleep(1);
    101                 continue;
    102             } else {
    103                 ui->Print("\nTimed out waiting for package.\n\n");
    104                 result = INSTALL_ERROR;
    105                 kill(child, SIGKILL);
    106                 break;
    107             }
    108         }
    109         result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, install_file, false, 0);
    110         break;
    111     }
    112 
    113     if (!waited) {
    114         // Calling stat() on this magic filename signals the minadbd
    115         // subprocess to shut down.
    116         stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &st);
    117 
    118         // TODO(dougz): there should be a way to cancel waiting for a
    119         // package (by pushing some button combo on the device).  For now
    120         // you just have to 'adb sideload' a file that's not a valid
    121         // package, like "/dev/null".
    122         waitpid(child, &status, 0);
    123     }
    124 
    125     if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
    126         if (WEXITSTATUS(status) == 3) {
    127             ui->Print("\nYou need adb 1.0.32 or newer to sideload\nto this device.\n\n");
    128         } else if (!WIFSIGNALED(status)) {
    129             ui->Print("\n(adbd status %d)\n", WEXITSTATUS(status));
    130         }
    131     }
    132 
    133     set_usb_driver(ui, false);
    134     maybe_restart_adbd(ui);
    135 
    136     return result;
    137 }
    138