support: Add support_chroot_create and support_chroot_free

1 files changed, 71 insertions, 0 deletions

diff --git a/support/support_chroot.c b/support/support_chroot.c
new file mode 100644
index 0000000000..c0807b313a
--- /dev/null
+++ b/support/support_chroot.c
@@ -0,0 +1,71 @@
+/* Setup a chroot environment for use within tests.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/namespace.h>
+#include <support/support.h>
+#include <support/temp_file.h>
+#include <support/test-driver.h>
+#include <support/xunistd.h>
+
+struct support_chroot *
+support_chroot_create (struct support_chroot_configuration conf)
+{
+  struct support_chroot *chroot = xmalloc (sizeof (*chroot));
+
+  chroot->path_chroot = xasprintf ("%s/tst-resolv-res_init-XXXXXX", test_dir);
+  if (mkdtemp (chroot->path_chroot) == NULL)
+    FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", chroot->path_chroot);
+  add_temp_file (chroot->path_chroot);
+
+  /* Create the /etc directory in the chroot environment.  */
+  char *path_etc = xasprintf ("%s/etc", chroot->path_chroot);
+  xmkdir (path_etc, 0777);
+  add_temp_file (path_etc);
+
+  if (conf.resolv_conf != NULL)
+    {
+      /* Create an empty resolv.conf file.  */
+      chroot->path_resolv_conf = xasprintf ("%s/resolv.conf", path_etc);
+      add_temp_file (chroot->path_resolv_conf);
+      support_write_file_string (chroot->path_resolv_conf, conf.resolv_conf);
+    }
+  else
+    chroot->path_resolv_conf = NULL;
+
+  free (path_etc);
+
+  /* valgrind needs a temporary directory in the chroot.  */
+  {
+    char *path_tmp = xasprintf ("%s/tmp", chroot->path_chroot);
+    xmkdir (path_tmp, 0777);
+    add_temp_file (path_tmp);
+    free (path_tmp);
+  }
+
+  return chroot;
+}
+
+void
+support_chroot_free (struct support_chroot *chroot)
+{
+  free (chroot->path_chroot);
+  free (chroot->path_resolv_conf);
+  free (chroot);
+}