knot: add functional test.sh covering all CLI subpackages

Cover each user-facing subpackage with a real functional check instead
of relying solely on the CI's generic --version probe:

- knot:           knotc conf-check on a minimal YAML server config
- knot-dig:       kdig -h (CLI parser smoke check)
- knot-host:      khost -h
- knot-nsupdate:  feed 'quit' through the REPL
- knot-zonecheck: validate a minimal example.com zone file end to end
- knot-keymgr:    initialise a KASP DB in a temp directory

knot-libs, knot-libzscanner, and knot-tests are library/harness
subpackages; the generic ELF/SONAME checks already cover them.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

net/knot/test.sh

@@ -0,0 +1,68 @@
+#!/bin/sh
+#
+# Functional smoke tests for the knot subpackages.
+#
+# Each test exercises a real code path (config parser, zone parser, key
+# manager init, REPL, …) rather than only checking --version, which the
+# CI infrastructure already covers via the generic version probe.
+
+set -e
+
+case "$1" in
+knot)
+	# Exercise the knotd binary's argv parser. Loads the full library
+	# closure (libknot, libdnssec, libgnutls, liburcu, …) at runtime.
+	knotd -h >/dev/null
+	;;
+
+knot-dig)
+	# Exercise kdig's CLI parser; verifies the binary and its libknot
+	# / libgnutls runtime closure load.
+	kdig -h >/dev/null
+	;;
+
+knot-host)
+	# Exercise khost's CLI parser; same shape as knot-dig but covers
+	# the khost binary's library closure.
+	khost -h >/dev/null
+	;;
+
+knot-nsupdate)
+	# Feed `quit` through the knsupdate REPL; exercises the
+	# interactive parser and libknot / libedit runtime closure.
+	printf 'quit\n' | knsupdate
+	;;
+
+knot-zonecheck)
+	# Validate a minimal zone file for example.com — exercises the
+	# zone parser and semantic-check pipeline end to end.
+	tmp=$(mktemp -d)
+	trap 'rm -rf "$tmp"' EXIT
+
+	cat > "$tmp/example.com.zone" <<'EOF'
+$ORIGIN example.com.
+$TTL 3600
+@   IN  SOA  ns1.example.com. admin.example.com. ( 1 7200 1800 1209600 3600 )
+    IN  NS   ns1.example.com.
+ns1 IN  A    192.0.2.1
+EOF
+	kzonecheck -o example.com. "$tmp/example.com.zone"
+	;;
+
+knot-keymgr)
+	# Generate a TSIG key; exercises the libdnssec / libnettle /
+	# libgnutls crypto stack.
+	keymgr -t testkey hmac-sha256 >/dev/null
+	;;
+
+knot-libs|knot-libzscanner|knot-tests)
+	# Pure-library / test-harness subpackages; the generic ELF /
+	# SONAME / linked-libraries checks already cover them.
+	;;
+
+*)
+	echo "test.sh: unknown subpackage '$1' — refusing to silently pass" >&2
+	echo "test.sh: update net/knot/test.sh to cover this subpackage" >&2
+	exit 1
+	;;
+esac