Add workaround for running hpy tests under jacoco

Author: msimacek

mx.graalpython/downstream_tests.py

@@ -76,6 +76,18 @@ def downstream_test_hpy(graalpy, testdir=None, args=None, env=None, check=True,
     hpy_test_root = hpy_root / "test"
     venv = testdir / 'hpy_venv'
     run([graalpy, "-m", "venv", str(venv)])
+    if graalpy.endswith('.sh'):
+        # Workaround jacoco launcher creating broken venv
+        venv_launcher_path = venv / "bin" / "graalpy.sh"
+        launcher = venv_launcher_path.read_text()
+        venv_launcher_path.unlink()
+        launcher = launcher.replace(
+            '--python.Executable=',
+            f'--python.Executable={venv_launcher_path.absolute()} --python.BaseExecutable=',
+        )
+        venv_launcher_path.write_text(launcher)
+        venv_launcher_path.chmod(0o755)
+        run([str(venv_launcher_path), '-m', 'ensurepip', '--default-pip'])
     run_in_venv(venv, ["pip", "install", "pytest", "pytest-xdist", "pytest-rerunfailures!=16.0", "filelock"])
     env = env or os.environ.copy()
     env["SETUPTOOLS_SCM_PRETEND_VERSION"] = "0.9.0"