On Wed, Oct 14, 2026 at 02:14:12PM +0200, Ivan Vecera wrote:
> Test 8c39 brings up lo with a bare "ip" command. nsPlugin runs it as
> "$IP netns exec <ns> ip ...", and as tdc runs commands with an empty
> environment, "ip netns exec" searches only the default execvp() path
> (/bin:/usr/bin). On systems that install ip only in /sbin, like Fedora,
> the setup fails:
>
> # ./tdc.py -e 8c39
> Test 8c39: HFSC classify walk still reaches leaf after lateral drift
> -----> prepare stage *** Could not execute: "ip link set lo up"
> -----> prepare stage *** Error message: "exec of "ip" failed: No such file
> or directory
>
> Use $IP like all other tdc tests do.
>
> Fixes: 1e24c4f2ee44 ("selftests: tc-testing: add a lateral-drift hfsc
> classify-walk test")
> Signed-off-by: Ivan Vecera <[email protected]>
> ---
> tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> index 4f6bbb8b57f9..557730eef055 100644
> --- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> +++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> @@ -181,7 +181,7 @@
> "requires": "nsPlugin"
> },
> "setup": [
> - "ip link set lo up",
> + "$IP link set lo up",
> "$TC qdisc add dev lo handle 1: root hfsc default 30",
> "$TC class add dev lo parent 1: classid 1:1 hfsc rt m2 100kbit",
> "$TC class add dev lo parent 1:1 classid 1:10 hfsc rt m2 50kbit",
> --
> 2.56.0
>
Reviewed-by: Hangbin Liu <[email protected]>
