make lint/generic: Lint shebang values

1 files changed, 11 insertions, 4 deletions

diff --git a/build-aux/lint-generic b/build-aux/lint-generic
index d982527..9bf88dd 100755
--- a/build-aux/lint-generic
+++ b/build-aux/lint-generic
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 # build-aux/lint-generic - Non-language-specific lint checks
 #
 # Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
@@ -16,12 +16,19 @@ r=0
 for filename in "$@"; do
 	# File header ##########################################################
 
-	shebang="$(sed -n '1{/^#!/{/^#!\/hint\//q; p;};}' "$filename")"
-	if [ -x "$filename" ] && [ -z "$shebang" ]; then
+	shebang="$(sed -n '1{/^#!/p;}' "$filename")"
+	if [[ -x $filename && (-z $shebang || $shebang == '#!/hint/'*) ]]; then
 		err "$filename" 'is executable but does not have a shebang'
-	elif [ -n "$shebang" ] && ! [ -x "$filename" ]; then
+	elif [[ (-n $shebang && $shebang != '#!/hint/'*) && ! -x $filename ]]; then
 		err "$filename" 'has a shebang but is not executable'
 	fi
+	case "$shebang" in
+		'') : ;;
+		'#!/bin/sh') : ;;
+		'#!/usr/bin/env bash') : ;;
+		'#!/usr/bin/env python3') : ;;
+		*) err "$filename" 'has an unrecognized shebang' ;;
+	esac
 
 	if ! grep -E -q 'Copyright \(C\) 202[4-9]((-|, )202[5-9])*  Luke T. Shumaker' "$filename"; then
 		err "$filename" 'is missing a copyright statement'