build: add make targets lint, lint-sh, lint-lua

[Matthias Schiffer: minor script improvements]

Makefile

@@ -103,6 +103,13 @@ endef
 list-targets: FORCE
 	@$(foreach target,$(GLUON_TARGETS),echo '$(target)';)
 
+lint: lint-lua lint-sh
+
+lint-lua: FORCE
+	@scripts/lint-lua.sh
+
+lint-sh: FORCE
+	@scripts/lint-sh.sh
 
 GLUON_DEFAULT_PACKAGES := hostapd-mini
 

scripts/lint-lua.sh

+#!/bin/sh
+
+set -e
+
+luacheck package scripts targets

scripts/lint-sh.sh

+#!/bin/sh
+
+set -e
+
+is_scriptfile() {
+	echo "$1" | grep -qE '.*\.sh$' || head -n1 "$1" | grep -qE '^#.*(sh|bash)$'
+}
+
+find contrib -type f | while read -r file; do
+	is_scriptfile "$file" || continue
+
+	echo "Checking $file"
+	shellcheck -f gcc "$file"
+done
+
+find package -type f | while read -r file; do
+	is_scriptfile "$file" || continue
+
+	echo "Checking $file"
+	shellcheck -f gcc -x -s sh -e SC2039,SC1091,SC2155,SC2034 "$file"
+done
+
+find scripts -type f | while read -r file; do
+	is_scriptfile "$file" || continue
+
+	echo "Checking $file"
+	shellcheck -f gcc -x -e SC2154,SC1090,SC2181,SC2155,SC2148,SC2034,SC2148 "$file"
+done