[PATCH v7 017/104] tests/tcg/meson.build: add wrapper run_and_check_forbidden_output

One of our test requires to make sure output does not contain a specific
string. An example is system multiarch test run-gdbstub-untimely-packet.

Reviewed-by: Manos Pitsidianakis <[email protected]>
Tested-by: Alex Bennée <[email protected]>
Tested-by: Aniket Sahu <[email protected]>
Signed-off-by: Pierrick Bouvier <[email protected]>
---
 tests/tcg/meson.build                         |  3 +++
 .../scripts/run_and_check_forbidden_output.sh | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100755 tests/tcg/scripts/run_and_check_forbidden_output.sh

diff --git a/tests/tcg/meson.build b/tests/tcg/meson.build
index f5fd9bee7bc..c718555d257 100644
--- a/tests/tcg/meson.build
+++ b/tests/tcg/meson.build
@@ -7,6 +7,9 @@ endif
 gdb = find_program(gdb_progs, required: false)
 prog_gdb_test = find_program('../guest-debug/run-test.py')
 prog_run_and_diff = find_program('./scripts/run_and_diff.sh')
+prog_run_and_check_forbidden_output = find_program(
+  './scripts/run_and_check_forbidden_output.sh'
+)
 
 tcg_tests = {}
 # tcg_tests is a dictionary with following structure:
diff --git a/tests/tcg/scripts/run_and_check_forbidden_output.sh b/tests/tcg/scripts/run_and_check_forbidden_output.sh
new file mode 100755
index 00000000000..4486ca8ef83
--- /dev/null
+++ b/tests/tcg/scripts/run_and_check_forbidden_output.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+set -euo pipefail
+
+if [ $# -lt 2 ]; then
+    echo "run_and_check_forbidden_output: 'forbidden string' cmd [args]..." 1>&2
+    exit 1
+fi
+forbidden="$1";shift
+output=$("$@" 2>&1)
+set -x
+if ! echo "$output" | grep -Fi "$forbidden"
+then
+    echo "output does not contain forbidden string: $forbidden"
+    exit 0
+fi
+echo "found forbidden string: $forbidden" 1>&2
+exit 1
-- 
2.43.0