From c3bae8b6a9ffecf0f41f1f6898a508066baa2f3c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mislav=20Marohni=C4=87?= <git@mislav.net>
Date: Mon, 23 Oct 2023 05:47:42 +0200
Subject: [PATCH] Fix fixing JRuby shebangs on macOS

LC_CTYPE is "utf-8" on macOS, which instructs utilities like `tr` to expect Unicode input. However, in case of binary files, which we here explicitly guard against, the utility will fail because of invalid input encoding.

The solution is to set LC_CTYPE=C which effectively removes the expectation around input encoding and allows `tr` to process the input byte-by-byte.
---
 bin/ruby-build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/ruby-build b/bin/ruby-build
index 8defac8d..00bff056 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -793,7 +793,7 @@ install_jruby_launcher() {
 
 fix_jruby_shebangs() {
   for file in "${PREFIX_PATH}/bin"/*; do
-    if [ "$(head -c 20 "$file" | tr -d '\0')" = "#!/usr/bin/env jruby" ]; then
+    if [ "$(head -c 20 "$file" | LC_CTYPE=C tr -d '\0')" = "#!/usr/bin/env jruby" ]; then
       sed -i.bak "1 s:.*:#\!${PREFIX_PATH}\/bin\/jruby:" "$file"
       rm "$file".bak
     fi