main: enforce options before commands

This patch turns on POSIXLY_CORRECT on the getopt parser to enforce
options before commands. Users get a hint in such a case:

 # nft list ruleset -a
 Error: syntax error, options must be specified before commands
 nft list ruleset -a
    ^             ~~

This patch recovers 9fc71bc6b602 ("main: Fix for misleading error with
negative chain priority").

Tests have been updated.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/shell/testcases/chains/0039negative_priority_0 b/tests/shell/testcases/chains/0039negative_priority_0
new file mode 100755
index 00000000..ba17b8cc
--- /dev/null
+++ b/tests/shell/testcases/chains/0039negative_priority_0
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# Test parsing of negative priority values
+
+set -e
+
+$NFT add table t
+$NFT add chain t c { type filter hook input priority -30\; }