support/support_chroot.c

   1 /* Setup a chroot environment for use within tests.
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdlib.h>
  20 #include <support/check.h>
  21 #include <support/namespace.h>
  22 #include <support/support.h>
  23 #include <support/temp_file.h>
  24 #include <support/test-driver.h>
  25 #include <support/xunistd.h>
  26
  27 struct support_chroot *
  28 support_chroot_create (struct support_chroot_configuration conf)
  29 {
  30   struct support_chroot *chroot = xmalloc (sizeof (*chroot));
  31
  32   chroot->path_chroot = xasprintf ("%s/tst-resolv-res_init-XXXXXX", test_dir);
  33   if (mkdtemp (chroot->path_chroot) == NULL)
  34     FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", chroot->path_chroot);
  35   add_temp_file (chroot->path_chroot);
  36
  37   /* Create the /etc directory in the chroot environment.  */
  38   char *path_etc = xasprintf ("%s/etc", chroot->path_chroot);
  39   xmkdir (path_etc, 0777);
  40   add_temp_file (path_etc);
  41
  42   if (conf.resolv_conf != NULL)
  43     {
  44       /* Create an empty resolv.conf file.  */
  45       chroot->path_resolv_conf = xasprintf ("%s/resolv.conf", path_etc);
  46       add_temp_file (chroot->path_resolv_conf);
  47       support_write_file_string (chroot->path_resolv_conf, conf.resolv_conf);
  48     }
  49   else
  50     chroot->path_resolv_conf = NULL;
  51
  52   free (path_etc);
  53
  54   /* valgrind needs a temporary directory in the chroot.  */
  55   {
  56     char *path_tmp = xasprintf ("%s/tmp", chroot->path_chroot);
  57     xmkdir (path_tmp, 0777);
  58     add_temp_file (path_tmp);
  59     free (path_tmp);
  60   }
  61
  62   return chroot;
  63 }
  64
  65 void
  66 support_chroot_free (struct support_chroot *chroot)
  67 {
  68   free (chroot->path_chroot);
  69   free (chroot->path_resolv_conf);
  70   free (chroot);
  71 }