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Expected behaviour in both variants is:
* Print help without error, append extension help if -m and/or -j
options are present
* Indicate lack of permissions in an error message for anything else
With iptables-nft, this was broken basically from day 1. Shared use of
do_parse() then somewhat broke legacy: it started complaining about
inability to create a lock file.
Fix this by making iptables-nft assume extension revision 0 is present
if permissions don't allow to verify. This is consistent with legacy.
Second part is to exit directly after printing help - this avoids having
to make the following code "nop-aware" to prevent privileged actions.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Florian Westphal <fw@strlen.de>
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