[PATCH net-next] selftests: rtnetlink: skip ifalias test if uuidgen is missing

[Darío Hueso Gisbert]

kci_test_ifalias() uses uuidgen to generate the alias names, but
uuidgen is not always installed on minimal systems. When it is
missing, the test fails with "uuidgen: command not found" instead of
being reported as skipped.

Check for uuidgen before running the test and return SKIP when it is
not available, as kci_test_promote_secondaries() already does for
ifconfig.

Assisted-by: LLM
Signed-off-by: Darío Hueso Gisbert <darihueso21@xxxxxxxxx>
---
The commit message and the added check were drafted with the help of
an LLM (Claude). I reviewed both and tested the script on a kernel
built from mainline, with uuidgen installed (unchanged behaviour) and
with it removed (the ifalias test now reports SKIP instead of FAIL).

On that kernel the unrelated ipsec_offload test fails with and without
this change.

 tools/testing/selftests/net/rtnetlink.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
index 4843d474538f..c758efb734da 100755
--- a/tools/testing/selftests/net/rtnetlink.sh
+++ b/tools/testing/selftests/net/rtnetlink.sh
@@ -412,6 +412,13 @@ kci_test_addrlabel()
 kci_test_ifalias()
 {
 	local ret=0
+
+	run_cmd uuidgen
+	if [ $ret -ne 0 ]; then
+		end_test "SKIP: uuidgen not installed"
+		return $ksft_skip
+	fi
+
 	namewant=$(uuidgen)
 	syspathname="/sys/class/net/$devdummy/ifalias"
 	run_cmd ip link set dev "$devdummy" alias "$namewant"
-- 
2.53.0