python system_error ai_generated true

PermissionError: [Errno 13] Permission denied: '/tmp/pytest-of-root/pytest-0/test_x0/out.txt'

ID: python/pytest-tmp-path-permissions

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-11-04First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
7.x active — — —
8.x active — — —

Root Cause

Tests run as root in one environment left /tmp/pytest-of-root owned by root; subsequent runs as a different user cannot write into the same tmp_path base.

generic

中文

在一个环境中以 root 运行的测试留下了由 root 拥有的 /tmp/pytest-of-root；随后以其他用户运行无法写入同一个 tmp_path 基础目录。

Workarounds

  1. 95% success 
    # pytest.ini
[pytest]
addopts = --basetemp=/home/ci/pytest-tmp
# ensure /home/ci/pytest-tmp exists and is writable
  2. 90% success 
    sudo rm -rf /tmp/pytest-of-root
pytest tests/

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Security risk and the next root run recreates restrictive perms.

  2. 60% fail

    May still collide if /var/tmp/pytest-of-root exists from a root run.

  3. 75% fail

    Loses pytest cleanup guarantees and can leave garbage.