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In "tests/shell/testcases/chains/netdev_chain_0", calling "trap ...
EXIT" multiple times does not work. Fix it, by calling one cleanup
function.
Note that we run in separate namespaces, so the cleanup is usually not
necessary. Still do it, we might want to run without unshare (via
NFT_TEST_UNSHARE_CMD=""). Without unshare, it's important that the
cleanup always works. In practice it might not, for example, "trap ...
EXIT" does not run for SIGTERM. A leaked interface might break the
follow up test and tests interfere with each other.
Try to workaround that by first trying to delete the interface.
Also failures to create the interfaces are not considered fatal. I don't
understand under what circumstances this might fail, note that there are
other tests that create dummy interface and don't "exit 77" on failure.
We want to know when something odd is going on.
Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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