[LTP] [RFC][PATCH 2/3] tst_test: Allow test to suggest reboot via $TST_REBOOT

[Petr Vorel]

Frameworks/tooling which run LTP can schedule reboot based on
environment variable.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
If useful, I should probably add it to C API as well
(at least swapoff01.c and swapon01.c print also "reboot recommended").

 doc/users/setup_tests.rst | 3 +++
 testcases/lib/tst_test.sh | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/users/setup_tests.rst b/doc/users/setup_tests.rst
index ddcf00f027..0cdb86715f 100644
--- a/doc/users/setup_tests.rst
+++ b/doc/users/setup_tests.rst
@@ -85,6 +85,9 @@ users.
    * - LTP_ENABLE_DEBUG
      - Enable debug info (value ``1`` or ``y``). Equivalent of ``-D`` parameter.
 
+   * - TST_REBOOT
+     - Environment variable set by LTP test to signalize that SUT should be rebooted.
+
 Environment variables for network tests
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 See :master:`testcases/network/README.md`.
diff --git a/testcases/lib/tst_test.sh b/testcases/lib/tst_test.sh
index 2b797705e3..a450976f36 100644
--- a/testcases/lib/tst_test.sh
+++ b/testcases/lib/tst_test.sh
@@ -16,6 +16,7 @@ export TST_COUNT=1
 export TST_ITERATIONS=1
 export TST_TMPDIR_RHOST=0
 export TST_LIB_LOADED=1
+export TST_REBOOT=
 
 . tst_ansi_color.sh
 . tst_security.sh
@@ -84,6 +85,10 @@ _tst_do_exit()
 		[ -z "$TST_SKIP_LSM_WARNINGS" ] && _tst_check_security_modules
 	fi
 
+	if [ "$TST_REBOOT" = 1 ]; then
+		tst_res TINFO "WARNING: reboot recommended due test changes"
+	fi
+
 	cat >&2 << EOF
 
 Summary:
@@ -687,7 +692,7 @@ tst_run()
 			CHECKPOINT_WAKE2|CHECKPOINT_WAKE_AND_WAIT);;
 			DEV_EXTRA_OPTS|DEV_FS_OPTS|FORMAT_DEVICE|MOUNT_DEVICE);;
 			SKIP_FILESYSTEMS|SKIP_IN_LOCKDOWN|SKIP_IN_SECUREBOOT);;
-			DEVICE_SIZE);;
+			DEVICE_SIZE|REBOOT);;
 			*) tst_res TWARN "Reserved variable TST_$_tst_i used!";;
 			esac
 		done
-- 
2.47.2