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authorFlorian Weimer <fweimer@redhat.com>2017-07-05 15:38:42 +0200
committerFlorian Weimer <fweimer@redhat.com>2017-07-05 19:04:40 +0200
commitd4165eedf5b85bfda3ea6b251f69838857e44925 (patch)
tree03ec09a2be6b35bfc3b3c720f084f98074477753 /support
parent76637a921f5d657998aa9a06981bf8a062ffd497 (diff)
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support: Add support_chroot_create and support_chroot_free
Diffstat (limited to 'support')
-rw-r--r--support/Makefile1
-rw-r--r--support/namespace.h32
-rw-r--r--support/support_chroot.c71
3 files changed, 104 insertions, 0 deletions
diff --git a/support/Makefile b/support/Makefile
index 423538d..1eba34b 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -40,6 +40,7 @@ libsupport-routines = \
support_can_chroot \
support_capture_subprocess \
support_capture_subprocess_check \
+ support_chroot \
support_enter_network_namespace \
support_format_address_family \
support_format_addrinfo \
diff --git a/support/namespace.h b/support/namespace.h
index e1ccaa1..859c2fd 100644
--- a/support/namespace.h
+++ b/support/namespace.h
@@ -60,6 +60,38 @@ bool support_in_uts_namespace (void);
non-zero exit status. */
void support_isolate_in_subprocess (void (*callback) (void *), void *closure);
+/* Describe the setup of a chroot environment, for
+ support_chroot_create below. */
+struct support_chroot_configuration
+{
+ /* File contents. The files are not created if the field is
+ NULL. */
+ const char *resolv_conf;
+};
+
+/* The result of the creation of a chroot. */
+struct support_chroot
+{
+ /* Path information. All these paths are relative to the parent
+ chroot. */
+
+ /* Path to the chroot directory. */
+ char *path_chroot;
+
+ /* Path to the /etc/resolv.conf file. */
+ char *path_resolv_conf;
+};
+
+/* Create a chroot environment. The returned data should be freed
+ using support_chroot_free below. The files will be deleted when
+ the process exits. This function does not enter the chroot. */
+struct support_chroot *support_chroot_create
+ (struct support_chroot_configuration);
+
+/* Deallocate the chroot information created by
+ support_chroot_create. */
+void support_chroot_free (struct support_chroot *);
+
__END_DECLS
#endif
diff --git a/support/support_chroot.c b/support/support_chroot.c
new file mode 100644
index 0000000..c0807b3
--- /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);
+}