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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"subprocess.SubprocessError: Exception occurred in preexec_fn.","articleBody":"Hello! I'm trying to run xonsh shell using rustpython on Mac but faced with error:\n\n```xsh\nxonsh\ncurl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh  # https://rustup.rs/\n# restart shell\ncargo install --features=ssl --git https://github.com/RustPython/RustPython rustpython\n$PATH.append(p'~/.cargo/bin')\n#rustpython -m site  # to get locations\nrustpython --install-pip\nrustpython -m pip install xonsh   \n```\nNote! No prompt-toolkit as workaround https://github.com/RustPython/RustPython/issues/6487\n```xsh\n~/.local/bin/xonsh --no-rc --no-env\n# Skipping setup. Because no `readline` implementation available.\n$XONSH_SHOW_TRACEBACK = True\nls\n```\nResult:\n```xsh\nxonsh: To log full traceback to a file set: $XONSH_TRACEBACK_LOGFILE = \u003cfilename\u003e\nTraceback (most recent call last):\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/procs/pipelines.py\", line 177, in __init__\n    proc = spec.run(pipeline_group=pipeline_group)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/procs/specs.py\", line 528, in run\n    p = self._run_binary(kwargs)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/procs/specs.py\", line 585, in _run_binary\n    raise xt.XonshError(e) from ex\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/procs/specs.py\", line 546, in _run_binary\n    p = self.cls(cmd, bufsize=bufsize, **kwargs)\n  File \"/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/7c3bc5e/crates/pylib/Lib/subprocess.py\", line 1062, in __init__\n    raise\n  File \"/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/7c3bc5e/crates/pylib/Lib/subprocess.py\", line 1034, in __init__\n    start_new_session, process_group)\n  File \"/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/7c3bc5e/crates/pylib/Lib/subprocess.py\", line 1958, in _execute_child\n    raise child_exception_type(err_msg)\nsubprocess.SubprocessError: Exception occurred in preexec_fn.\n```\n\n## For community\n⬇️  **Please click the 👍 reaction instead of leaving a `+1` or 👍  comment**","author":{"url":"https://github.com/anki-code","@type":"Person","name":"anki-code"},"datePublished":"2025-12-24T13:50:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/6489/RustPython/issues/6489"}