support/support_chroot.c

   1 /* Setup a chroot environment for use within tests.
   2    Copyright (C) 2017-2023 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    <https://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 /* If CONTENTS is not NULL, write it to the file at DIRECTORY/RELPATH,
  28    and store the name in *ABSPATH.  If CONTENTS is NULL, store NULL in
  29    *ABSPATH.  */
  30 static void
  31 write_file (const char *directory, const char *relpath, const char *contents,
  32             char **abspath)
  33 {
  34   if (contents != NULL)
  35     {
  36       *abspath = xasprintf ("%s/%s", directory, relpath);
  37       add_temp_file (*abspath);
  38       support_write_file_string (*abspath, contents);
  39     }
  40   else
  41     *abspath = NULL;
  42 }
  43
  44 struct support_chroot *
  45 support_chroot_create (struct support_chroot_configuration conf)
  46 {
  47   struct support_chroot *chroot = xmalloc (sizeof (*chroot));
  48   chroot->path_chroot = support_create_temp_directory ("tst-resolv-res_init-");
  49
  50   /* Create the /etc directory in the chroot environment.  */
  51   char *path_etc = xasprintf ("%s/etc", chroot->path_chroot);
  52   xmkdir (path_etc, 0777);
  53   add_temp_file (path_etc);
  54
  55   write_file (path_etc, "resolv.conf", conf.resolv_conf,
  56               &chroot->path_resolv_conf);
  57   write_file (path_etc, "hosts", conf.hosts, &chroot->path_hosts);
  58   write_file (path_etc, "host.conf", conf.host_conf, &chroot->path_host_conf);
  59   write_file (path_etc, "aliases", conf.aliases, &chroot->path_aliases);
  60
  61   free (path_etc);
  62
  63   /* valgrind needs a temporary directory in the chroot.  */
  64   {
  65     char *path_tmp = xasprintf ("%s/tmp", chroot->path_chroot);
  66     xmkdir (path_tmp, 0777);
  67     add_temp_file (path_tmp);
  68     free (path_tmp);
  69   }
  70
  71   return chroot;
  72 }
  73
  74 void
  75 support_chroot_free (struct support_chroot *chroot)
  76 {
  77   free (chroot->path_chroot);
  78   free (chroot->path_resolv_conf);
  79   free (chroot->path_hosts);
  80   free (chroot->path_host_conf);
  81   free (chroot->path_aliases);
  82   free (chroot);
  83 }