tests: improve setarch tests, regarding --uname-2.6 issues

Add some more tests:
  * error handling "unknown arch" and "unknown command"
  * "noop" test with host arch and no other options
  * all options except --uname-2.6
  * --uname-2.6 whithout any other options but handle fatal
    glibc error "kernel too old" (with debug output)
  * add a "real" --uname-2.6 test which validates uname(1)
    output

Note the "kernel too old" cases are systems where glibc was
configured to support only kernels > 3.0. On some archs
(e.g. x86) --uname-2.6 still works with such glibc because
2.6.39 had all needed features on board (e.g. vdso).
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=806911

Some people reported segfaults (after execvp) but I can only
reproduce it on arm* and aarch64 qemu-user-space builds. We
don't need to fix our tests for such broken systems where
also many other tests fail currently.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

1 files changed, 66 insertions, 8 deletions

diff --git a/tests/ts/misc/setarch b/tests/ts/misc/setarch
index 9b0e92eee..c8050e52a 100755
--- a/tests/ts/misc/setarch
+++ b/tests/ts/misc/setarch
@@ -21,13 +21,71 @@ ts_init "$*"
 ts_check_test_command "$TS_CMD_SETARCH"
 
 ARCH=$(uname -m)
-case $ARCH in
-	#  setarch --uname-2.6 fails on platforms without VDS
-	*sparc* )
-		ts_skip "unsupported arch"
-		;;
-esac
-
-$TS_CMD_SETARCH $(uname -m) -vRFZLXBIST3 --uname-2.6 echo "success" >$TS_OUTPUT 2>&1
+
+ts_init_subtest options
+echo "###### unknown arch" >>$TS_OUTPUT
+$TS_CMD_SETARCH qubit -v echo "success" >>$TS_OUTPUT 2>&1
+echo "exit: $?" >>$TS_OUTPUT
+
+echo "###### unknown command" >>$TS_OUTPUT
+$TS_CMD_SETARCH $ARCH -v /das/gibs/nicht >>$TS_OUTPUT 2>&1
+echo "exit: $?" >>$TS_OUTPUT
+
+echo "###### noop uname -a" >>$TS_OUTPUT
+uname_a=$(uname -srm)
+$TS_CMD_SETARCH $ARCH -v uname -srm >>$TS_OUTPUT 2>&1
+sed -i "$ s@${uname_a}@uname -a unchanged@" $TS_OUTPUT
+
+echo "###### almost all options" >>$TS_OUTPUT
+$TS_CMD_SETARCH $ARCH -vRFZLXBIST3 echo "success" >>$TS_OUTPUT 2>&1
+ts_finalize_subtest
+
+
+ts_init_subtest uname26
+finmsg="" # for debugging 2.6 issues
+
+echo "###### --uname-2.6 echo" >>$TS_OUTPUT
+$TS_CMD_SETARCH $ARCH -v --uname-2.6 echo "2.6 worked" >>$TS_OUTPUT 2>&1
+if [ $? -eq 0 ]; then
+	expected='^2.6 worked$'
+else
+	# this may happen after execvp
+	expected="^FATAL: kernel too old$"
+	finmsg+=" echo"
+fi
+sed -i "$ s/$expected/2.6 works or kernel too old/" $TS_OUTPUT
+
+echo "###### --uname-2.6 true, non-verbose" >>$TS_OUTPUT
+$TS_CMD_SETARCH $ARCH --uname-2.6 true >>$TS_OUTPUT 2>&1
+if [ $? -eq 0 ]; then
+	echo "2.6 works or kernel too old" >> $TS_OUTPUT
+else
+	# this may happen after execvp
+	expected="^FATAL: kernel too old$"
+	sed -i "$ s/$expected/2.6 works or kernel too old/" $TS_OUTPUT
+	finmsg+=" true"
+fi
+
+if [ -n "$finmsg" ]; then
+	finmsg=$(echo unsupported --uname-2.6: $finmsg)
+else
+	uname26_seems_supported=yes
+fi
+ts_finalize_subtest "$finmsg"
+
+
+# conditional subtest
+if [ "$uname26_seems_supported" = "yes" ]; then
+ts_init_subtest uname26-version
+	tmp=$($TS_CMD_SETARCH $ARCH --uname-2.6 uname -r)
+	if echo "$tmp" | grep -q "^2\.6\."; then
+		echo "kernel version changed to 2.6" >> $TS_OUTPUT
+	else
+		echo "uname26 failed" >> $TS_OUTPUT
+		echo "original kernel: $(uname -r)" >> $TS_OUTPUT
+		echo "uname26 kernel:  $tmp" >> $TS_OUTPUT
+	fi
+ts_finalize_subtest
+fi # conditional subtest
 
 ts_finalize