selftests: forwarding: lib: Add require_command()

The logic for testing whether a certain command is available is used
several times in the current code base. The tests in follow-up patches
add more requirements like that.

Therefore extract the logic into a named function, require_command(),
that can be used directly from lib.sh as well as from any test that
wishes to declare dependence on some command.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 158d59ffee4062f5f45b3819359225ebbd17a740..81e36157bf169f46e07ff47952ef4a8107af6495 100644 (file)
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -62,15 +62,18 @@ if [[ "$CHECK_TC" = "yes" ]]; then
        check_tc_version
 fi
 
-if [[ ! -x "$(command -v jq)" ]]; then
-       echo "SKIP: jq not installed"
-       exit 1
-fi
+require_command()
+{
+       local cmd=$1; shift
 
-if [[ ! -x "$(command -v $MZ)" ]]; then
-       echo "SKIP: $MZ not installed"
-       exit 1
-fi
+       if [[ ! -x "$(command -v "$cmd")" ]]; then
+               echo "SKIP: $cmd not installed"
+               exit 1
+       fi
+}
+
+require_command jq
+require_command $MZ
 
 if [[ ! -v NUM_NETIFS ]]; then
        echo "SKIP: importer does not define \"NUM_NETIFS\""