Fix TypeError when running get_rpaths on rez.utils.elf module

Signed-off-by: Ruzette Krukkert <ruzettekrukkert@fusefx.com>

src/rez/tests/test_utils_elf.py

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright Contributors to the Rez Project
+
+
+"""
+unit tests for 'rez.utils.elf' module
+"""
+from rez.tests.util import TestBase
+from rez.utils.elf import get_rpaths, patch_rpaths
+
+
+class TestElfUtils(TestBase):
+
+    def __init__(self, *nargs, **kwargs):
+        super().__init__(*nargs, **kwargs)
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super().tearDownClass()
+
+    def test_get_rpaths_raises_runtime_exception(self):
+        """Tests that no TypeError from elf functions are raised."""
+        self.assertRaises(
+            RuntimeError,
+            get_rpaths("/path/to/elfpath")
+        )
+
+        self.assertRaises(
+            RuntimeError,
+            patch_rpaths("/path/to/elfpath", ["$ORIGIN", "$ORIGINTEST"])
+        )

src/rez/utils/elf.py

@@ -10,6 +10,7 @@
 import subprocess
 
 from rez.utils.filesystem import make_path_writable
+from rez.utils.execution import Popen
 
 
 def get_rpaths(elfpath):
@@ -54,10 +55,11 @@ def patch_rpaths(elfpath, rpaths):
 
 
 def _run(*nargs, **popen_kwargs):
-    proc = subprocess.Popen(
+    proc = Popen(
         nargs,
         stdout=subprocess.PIPE,
         stderr=subprocess.PIPE,
+        text=True,
         **popen_kwargs
     )