From 2c5a576bc4f8e0ed19d9cfc9efc5538db826ffc3 Mon Sep 17 00:00:00 2001
From: Tim <tim@gigalixir.com>
Date: Wed, 19 Nov 2025 09:14:16 -0600
Subject: [PATCH 1/2] feat: sanitize the config file before sourcing

---
 lib/misc_funcs.sh                             |  13 +++++-
 test/clean_config_file.sh                     |  40 ++++++++++++++++++
 .../unicode_chars/elixir_buildpack.config     | Bin 0 -> 94 bytes
 3 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100755 test/clean_config_file.sh
 create mode 100644 test/config_files/unicode_chars/elixir_buildpack.config

diff --git a/lib/misc_funcs.sh b/lib/misc_funcs.sh
index 974345b..b0b921b 100644
--- a/lib/misc_funcs.sh
+++ b/lib/misc_funcs.sh
@@ -87,7 +87,7 @@ function load_config() {
 
   if [ -f $custom_config_file ];
   then
-    source $custom_config_file
+    source_file $custom_config_file
     assert_elixir_version_set $custom_config_file
   fi
 
@@ -243,3 +243,14 @@ function fix_elixir_version() {
     exit 1
   fi
 }
+
+function source_file() {
+  local bkup_file=$(mktemp /tmp/buildpack_source_file_bkup.XXXX)
+
+  cp $1 $bkup_file
+
+  # sanitize the file to avoid any non-printable characters
+  LC_ALL=C tr -cd '\11\12\15\40-\176' < $bkup_file > $1
+  source $1
+  mv $bkup_file $1
+}
diff --git a/test/clean_config_file.sh b/test/clean_config_file.sh
new file mode 100755
index 0000000..0f8bb43
--- /dev/null
+++ b/test/clean_config_file.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -e
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+source $SCRIPT_DIR/.test_support.sh
+
+# include source file
+source $SCRIPT_DIR/../lib/misc_funcs.sh
+
+# override functions
+reset_test() {
+  EXIT_CODE=0
+  OUTPUT_LINES=()
+}
+
+exit() {
+  EXIT_CODE=$1
+}
+output_line() {
+  OUTPUT_LINES+=("$1")
+}
+
+
+# TESTS
+######################
+suite "clean_config_file"
+
+  test "handles unicode characters gracefully"
+
+    build_path="${SCRIPT_DIR}/config_files/unicode_chars"
+    load_config
+
+    [ "$EXIT_CODE" == 0 ]
+    [ "${elixir_version}" == "v1.19.1" ]
+    [ "${erlang_version}" == "27.3.4" ]
+
+
+
+PASSED_ALL_TESTS=true
diff --git a/test/config_files/unicode_chars/elixir_buildpack.config b/test/config_files/unicode_chars/elixir_buildpack.config
new file mode 100644
index 0000000000000000000000000000000000000000..b773bb95cfebdc66f9d2ee462d85ed23648274ed
GIT binary patch
literal 94
zcmezWFO?yOA(Np3h>IBF8Oj(^fpjsDm(P&LV9Q|0pa;a3V3L=C3oM(%kO-7Z$D-PZ
O!5pa47>G?6K&k<^Ul7Uw

literal 0
HcmV?d00001


From 3ac946838c5d2d701e2d336fa3bd00df5d6c1197 Mon Sep 17 00:00:00 2001
From: Tim <tim@gigalixir.com>
Date: Wed, 19 Nov 2025 09:16:40 -0600
Subject: [PATCH 2/2] fix(ci): only test script files

---
 .github/workflows/ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6a037c0..0369d9d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,4 +14,4 @@ jobs:
 
     - name: run tests
       run: |
-        for tst in test/*; do $tst; done
+        for tst in test/*.sh; do $tst; done