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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_venv.test_special_chars_csh fails on NetBSD","articleBody":"# Bug report\n\n### Bug description:\n\nThe `test_venv.BasicTest.test_special_chars_csh` test fails on NetBSD. NetBSD's csh cannot properly handle the specific character combination `'\";\u0026\u0026$e|\"'` even when correctly quoted, because `$e` is interpreted as a variable reference.\n\n### Configuration\n\n```sh\n./configure --with-pydebug\n```\n\n### Test\n\n```python\nhome$ ./python -m test test_venv -m test_special_chars_csh -v\n== CPython 3.15.0a0 free-threading build (heads/main:e8382e55c57, Sep 23 2025, 21:04:49) [GCC 10.5.0]\n== NetBSD-10.1-amd64-x86_64-64bit-ELF little-endian\n== Python build: free_threading debug\n== cwd: /home/orange/cpython/build/test_python_worker_6821æ\n== CPU count: 16\n== encodings: locale=UTF-8 FS=utf-8\n== resources: all test resources are disabled, use -u option to unskip tests\n\nUsing random seed: 3517063575\n0:00:00 load avg: 0.08 Run 1 test sequentially in a single process\n0:00:00 load avg: 0.08 [1/1] test_venv\ntest_special_chars_csh (test.test_venv.BasicTest.test_special_chars_csh)\nTest that the template strings are quoted properly (csh) ... prompt: Undefined variable.\n\nERROR\n\n======================================================================\nERROR: test_special_chars_csh (test.test_venv.BasicTest.test_special_chars_csh)\nTest that the template strings are quoted properly (csh)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/orange/cpython/Lib/test/test_venv.py\", line 544, in test_special_chars_csh\n    out, err = check_output([csh, test_script])\n               ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^\n  File \"/home/orange/cpython/Lib/test/test_venv.py\", line 58, in check_output\n    raise subprocess.CalledProcessError(\n        p.returncode, cmd, out, err)\nsubprocess.CalledProcessError: Command '['/bin/csh', '/tmp/tmp82wovfyk/test_special_chars.csh']' returned non-zero exit status 1.\n\n----------------------------------------------------------------------\nRan 1 test in 1.969s\n\nFAILED (errors=1)\ntest test_venv failed\n0:00:02 load avg: 0.15 [1/1/1] test_venv failed (1 error)\n\n== Tests result: FAILURE ==\n\n1 test failed:\n    test_venv\n\nTotal duration: 2.3 sec\nTotal tests: run=1 (filtered)\nTotal test files: run=1/1 (filtered) failed=1\nResult: FAILURE\nhome$\n```\n\n### Reproduce\n```python\nimport os\nimport tempfile\nimport shutil\nimport subprocess\nimport shlex\nfrom venv import EnvBuilder\n\n\ndef test_original_test_case():\n    print(\"\\n=== Reproducing original test case ===\")\n\n    csh = shutil.which('tcsh') or shutil.which('csh')\n    if not csh:\n        print(\"No csh/tcsh found, skipping test\")\n        return\n    with tempfile.TemporaryDirectory() as tmpdir:\n        env_name = '\";\u0026\u0026$e|\"'\n        env_dir = os.path.join(os.path.realpath(tmpdir), env_name)\n        try:\n            builder = EnvBuilder(clear=True)\n            builder.create(env_dir)\n            activate = os.path.join(env_dir, 'bin', 'activate.csh')\n            test_script = os.path.join(tmpdir, 'test_special_chars.csh')\n            with open(test_script, \"w\") as f:\n                f.write(f'source {shlex.quote(activate)}\\n'\n                        'python -c \\'import sys; print(sys.executable)\\'\\n'\n                        'python -c \\'import os; print(os.environ[\"VIRTUAL_ENV\"])\\'\\n'\n                        'deactivate\\n')\n            print(f\"\\nRunning test script with {csh}:\")\n            try:\n                result = subprocess.run([csh, test_script],\n                                      capture_output=True, text=True, timeout=10)\n                print(f\"Return code: {result.returncode}\")\n                if result.returncode == 0:\n                    print(f\"Output: {result.stdout}\")\n                else:\n                    print(f\"Error: {result.stderr}\")\n            except Exception as e:\n                print(f\"Error running test: {e}\")\n\n        except Exception as e:\n            print(f\"Error in test case: {e}\")\n\n\nif __name__ == \"__main__\":\n    test_original_test_case()\n```\nOutput:\n```sh\nhome: {5} ./python reproducer.py\n\n=== Reproducing original test case ===\n\nRunning test script with /bin/csh:\nReturn code: 1\nError: prompt: Undefined variable.\n\nhome: {6} echo $SHELL\n/bin/csh\n```\n\n```sh\n# This FAILS with \"Unmatched .\" error\n/bin/csh -c 'echo \"Testing: \\\";\u0026\u0026$e|\\\"\"'\n\n# This FAILS with \"e: Undefined variable.\" error\n/bin/csh -c 'echo \"Testing: '\\'';\u0026\u0026$e|'\\''\"'\n\n# This WORKS correctly\n/bin/csh -c 'echo '\\''\";\u0026\u0026$e|\"'\\'''\n```\n\n### CPython versions tested on:\n\nCPython main branch, 3.15, 3.14, 3.13\n\n### Operating systems tested on:\n\nOther\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-139341\n* gh-139559\n* gh-139560\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/furkanonder","@type":"Person","name":"furkanonder"},"datePublished":"2025-09-24T19:31:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/139308/cpython/issues/139308"}