src/tests/sys_mixed.c

   1 /* liblxcapi
   2  *
   3  * Copyright © 2021 Christian Brauner <christian.brauner@ubuntu.com>.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <inttypes.h>
  24 #include <signal.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32
  33 #include "lxccontainer.h"
  34 #include "attach_options.h"
  35
  36 #ifdef HAVE_STATVFS
  37 #include <sys/statvfs.h>
  38 #endif
  39
  40 #include "lxctest.h"
  41 #include "utils.h"
  42
  43 static int is_read_only(const char *path)
  44 {
  45 #ifdef HAVE_STATVFS
  46         int ret;
  47         struct statvfs sb;
  48
  49         ret = statvfs(path, &sb);
  50         if (ret < 0)
  51                 return -errno;
  52
  53         return (sb.f_flag & MS_RDONLY) > 0;
  54 #else
  55         return -EOPNOTSUPP;
  56 #endif
  57 }
  58
  59 static int sys_mixed(void *payload)
  60 {
  61         int ret;
  62
  63         ret = is_read_only("/sys");
  64         if (ret == -EOPNOTSUPP)
  65                 return 0;
  66
  67         if (ret <= 0)
  68                 return -1;
  69
  70         if (is_read_only("/sys/devices/virtual/net"))
  71                 return -1;
  72
  73         return 0;
  74 }
  75
  76 int main(int argc, char *argv[])
  77 {
  78         int fret = EXIT_FAILURE;
  79         lxc_attach_options_t attach_options = LXC_ATTACH_OPTIONS_DEFAULT;
  80         int ret;
  81         pid_t pid;
  82         struct lxc_container *c;
  83
  84         c = lxc_container_new("sys-mixed", NULL);
  85         if (!c) {
  86                 lxc_error("%s", "Failed to create container \"sys-mixed\"");
  87                 exit(fret);
  88         }
  89
  90         if (c->is_defined(c)) {
  91                 lxc_error("%s\n", "Container \"sys-mixed\" is defined");
  92                 goto on_error_put;
  93         }
  94
  95         if (!c->createl(c, "busybox", NULL, NULL, 0, NULL)) {
  96                 lxc_error("%s\n", "Failed to create busybox container \"sys-mixed\"");
  97                 goto on_error_put;
  98         }
  99
 100         if (!c->is_defined(c)) {
 101                 lxc_error("%s\n", "Container \"sys-mixed\" is not defined");
 102                 goto on_error_put;
 103         }
 104
 105         c->clear_config(c);
 106
 107         if (!c->load_config(c, NULL)) {
 108                 lxc_error("%s\n", "Failed to load config for container \"sys-mixed\"");
 109                 goto on_error_stop;
 110         }
 111
 112         if (!c->set_config_item(c, "lxc.mount.auto", "sys:mixed")) {
 113                 lxc_error("%s\n", "Failed to set config item \"lxc.mount.auto=sys:mixed\"");
 114                 goto on_error_put;
 115         }
 116
 117         if (!c->want_daemonize(c, true)) {
 118                 lxc_error("%s\n", "Failed to mark container \"sys-mixed\" daemonized");
 119                 goto on_error_stop;
 120         }
 121
 122         if (!c->startl(c, 0, NULL)) {
 123                 lxc_error("%s\n", "Failed to start container \"sys-mixed\" daemonized");
 124                 goto on_error_stop;
 125         }
 126
 127         /* Leave some time for the container to write something to the log. */
 128         sleep(2);
 129
 130         ret = c->attach(c, sys_mixed, NULL, &attach_options, &pid);
 131         if (ret < 0) {
 132                 lxc_error("%s\n", "Failed to run function in container \"sys-mixed\"");
 133                 goto on_error_stop;
 134         }
 135
 136         ret = wait_for_pid(pid);
 137         if (ret < 0) {
 138                 lxc_error("%s\n", "Failed to run function in container \"sys-mixed\"");
 139                 goto on_error_stop;
 140         }
 141
 142         fret = 0;
 143
 144 on_error_stop:
 145         if (c->is_running(c) && !c->stop(c))
 146                 lxc_error("%s\n", "Failed to stop container \"sys-mixed\"");
 147
 148         if (!c->destroy(c))
 149                 lxc_error("%s\n", "Failed to destroy container \"sys-mixed\"");
 150
 151 on_error_put:
 152         lxc_container_put(c);
 153         exit(fret);
 154 }