sysupgrade.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  * Copyright (C) 2017 Matthias Schiffer <mschiffer@universe-factory.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License version 2.1
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16
  17 #include "watchdog.h"
  18 #include "sysupgrade.h"
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23
  24
  25 void sysupgrade_exec_upgraded(const char *prefix, char *path, char *command)
  26 {
  27         char *wdt_fd = watchdog_fd();
  28         char *argv[] = { "/sbin/upgraded", NULL, NULL, NULL};
  29
  30         if (chroot(prefix)) {
  31                 fprintf(stderr, "Failed to chroot for upgraded exec.\n");
  32                 return;
  33         }
  34
  35         argv[1] = path;
  36         argv[2] = command;
  37
  38         if (wdt_fd) {
  39                 watchdog_set_cloexec(false);
  40                 setenv("WDTFD", wdt_fd, 1);
  41         }
  42         execvp(argv[0], argv);
  43
  44         /* Cleanup on failure */
  45         fprintf(stderr, "Failed to exec upgraded.\n");
  46         unsetenv("WDTFD");
  47         watchdog_set_cloexec(true);
  48         chroot(".");
  49 }