tests: avoid unwarranted failure in mock-simulated non-SELinux env.

* tests/init.cfg (require_selinux_): Skip the test also when
/proc/filesystems does not list selinuxfs.
Add comments.
* cfg.mk (exclude_file_name_regexp--sc_file_system): Exempt
tests/init.cfg, with its use of /proc/filesystems.
Based on the patch by Mathieu Bridon in http://debbugs.gnu.org/8359.
More discussion in http://bugzilla.redhat.com/573111

diff --git a/cfg.mk b/cfg.mk
index fe2dd13..99a6e5e 100644 (file)
--- a/cfg.mk
+++ b/cfg.mk
@@ -345,7 +345,8 @@ exclude_file_name_regexp--sc_po_check = ^gl/
 exclude_file_name_regexp--sc_prohibit_always-defined_macros = ^src/seq\.c$$
 exclude_file_name_regexp--sc_prohibit_empty_lines_at_EOF = ^tests/pr/
 exclude_file_name_regexp--sc_program_name = ^(gl/.*|lib/euidaccess-stat)\.c$$
-exclude_file_name_regexp--sc_file_system = NEWS|^(src/df\.c|tests/misc/df-P)$$
+exclude_file_name_regexp--sc_file_system = \
+  NEWS|^(tests/init\.cfg|src/df\.c|tests/misc/df-P)$$
 exclude_file_name_regexp--sc_prohibit_always_true_header_tests = \
   ^m4/stat-prog\.m4$$
 exclude_file_name_regexp--sc_prohibit_fail_0 = \

diff --git a/tests/init.cfg b/tests/init.cfg
index f74d50c..0711455 100644 (file)
--- a/tests/init.cfg
+++ b/tests/init.cfg
@@ -216,6 +216,13 @@ skip_if_()
 
 require_selinux_()
 {
+  # When in a chroot of an SELinux-enabled system, but with a mock-simulated
+  # SELinux-*disabled* system, recognize that SELinux is disabled system wide:
+  grep 'selinuxfs$' /proc/filesystems > /dev/null \
+    || skip_test_ "this system lacks SELinux support"
+
+  # Independent of whether SELinux is enabled system-wide,
+  # the current file system may lack SELinux support.
   case `ls -Zd .` in
     '? .'|'unlabeled .')
       skip_test_ "this system (or maybe just" \