selftests/net: l2_tos_ttl_inherit.sh: Ensure environment cleanup on failure.
Use 'set -e' and an exit handler to stop the script if a command fails and ensure the test environment is cleaned up in any case. Also, handle the case where the script is interrupted by SIGINT. The only command that's expected to fail is 'wait $ping_pid', since it's killed by the script. Handle this case with '|| true' to make it play well with 'set -e'. Finally, return the Kselftest SKIP code (4) when the script breaks because of an environment problem or a command line failure. The 0 and 1 return codes should now reliably indicate that all tests have been run (0: all tests run and passed, 1: all tests run but at least one failed, 4: test script didn't run completely). Fixes: b690842d ("selftests/net: test l2 tunnel TOS/TTL inheriting") Reported-by:Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr> Tested-by:
Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr> Signed-off-by:
Guillaume Nault <gnault@redhat.com> Signed-off-by:
Paolo Abeni <pabeni@redhat.com>
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