In some forwarding tests, it is necessary to check for features or
specific keywords in command output before proceeding.

Introduce the run_cmd_grep helper in lib.sh. This helper executes a
command and searches for a specific pattern in its output.

Signed-off-by: Aleksei Oladko <[email protected]>
---
 tools/testing/selftests/net/forwarding/lib.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh 
b/tools/testing/selftests/net/forwarding/lib.sh
index 0a474b02371d..dcf17c19ad77 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -2163,3 +2163,22 @@ has_unicast_flt()
 
        [[ $promisc == 1 ]] && echo "no" || echo "yes"
 }
+
+run_cmd_grep_common()
+{
+       local find="$1"; shift
+       local cmd="$*"
+
+       if [ "$VERBOSE" = "1" ]; then
+               echo "COMMAND: ${cmd} 2>&1 | grep -q '${find}'"
+       fi
+       $cmd 2>&1 | grep -q "${find}"
+       return $?
+}
+
+run_cmd_grep() {
+       run_cmd_grep_common "$@"
+       rc=$?
+       check_err $rc
+       return $rc
+}
-- 
2.43.0


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