BUG: `Reading from cache archive failed` while upgrading `pytest`

[harshil21]

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Hi! Thanks for making uv! I just upgraded to uv 0.1.3 from 0.1.2 and wanted to upgrade pytest (from 8.0.0 to 8.0.1), so I ran uv pip install -U pytest, however that resulted in an error:

error: Reading from cache archive failed: check bytes error: check failed for tuple struct member 0: check failed for slice index 0: check failed for struct member files: check failed for struct member source_dists: check failed for slice index 0: check failed for struct member file: check failed for struct member requires_python: invalid tag for enum: 108

Here's the full error with --verbose:

Log

(.venv) ➜  python-telegram-bot git:(dependabot/pip/pytest-8.0.0) uv pip install -U pytest --verbose
 uv::requirements::from_source source=pytest
    0.002668s DEBUG uv_interpreter::virtual_env Found a virtualenv through VIRTUAL_ENV at: /home/hoppingturtles/Documents/pyprojects/python-telegram-bot/.venv
    0.002763s DEBUG uv_interpreter::interpreter Using cached markers for: /home/hoppingturtles/Documents/pyprojects/python-telegram-bot/.venv/bin/python
    0.002772s DEBUG uv::commands::pip_install Using Python 3.12.2 environment at /home/hoppingturtles/Documents/pyprojects/python-telegram-bot/.venv/bin/python
 uv_client::flat_index::from_entries 
 uv_resolver::resolver::solve 
      0.005313s   0ms DEBUG uv_resolver::resolver Solving with target Python version 3.12.2
   uv_resolver::resolver::choose_version package=root
   uv_resolver::resolver::get_dependencies package=root, version=0a0.dev0
        0.005372s   0ms DEBUG uv_resolver::resolver Adding direct dependency: pytest*
   uv_resolver::resolver::choose_version package=pytest
     uv_resolver::resolver::package_wait package_name=pytest
 uv_resolver::resolver::process_request request=Versions pytest
   uv_client::registry_client::simple_api package=pytest
     uv_client::cached_client::get_cacheable 
       uv_client::cached_client::read_and_parse_cache file=/home/hoppingturtles/.cache/uv/simple-v0/pypi/pytest.rkyv
 uv_resolver::resolver::process_request request=Prefetch pytest *
          0.006056s   0ms DEBUG uv_client::cached_client Found fresh response for: https://pypi.org/simple/pytest/
 uv_resolver::version_map::from_metadata 
   uv_distribution::distribution_database::get_or_build_wheel_metadata dist=pytest==8.0.1
     uv_client::registry_client::wheel_metadata built_dist=pytest==8.0.1
       uv_client::cached_client::get_serde 
         uv_client::cached_client::get_cacheable 
           uv_client::cached_client::read_and_parse_cache file=/home/hoppingturtles/.cache/uv/wheels-v0/pypi/pytest/pytest-8.0.1-py3-none-any.msgpack
        0.006598s   1ms DEBUG uv_resolver::resolver Searching for a compatible version of pytest (*)
        0.006609s   1ms DEBUG uv_resolver::resolver Selecting: pytest==8.0.1 (pytest-8.0.1-py3-none-any.whl)
   uv_resolver::resolver::get_dependencies package=pytest, version=8.0.1
     uv_resolver::resolver::distributions_wait package_id=pytest-8.0.1
              0.006748s   0ms DEBUG uv_client::cached_client Found fresh response for: https://files.pythonhosted.org/packages/2e/28/30125a808a2448d72fdba26d01ef2bec76a3c860c8694b636e6104e38713/pytest-8.0.1-py3-none-any.whl
        0.006828s   0ms DEBUG uv_resolver::resolver Adding transitive dependency: iniconfig*
        0.006840s   0ms DEBUG uv_resolver::resolver Adding transitive dependency: pluggy>=1.3.0, <2.0
        0.006848s   0ms DEBUG uv_resolver::resolver Adding transitive dependency: packaging*
   uv_resolver::resolver::choose_version package=iniconfig
     uv_resolver::resolver::package_wait package_name=iniconfig
 uv_resolver::resolver::process_request request=Versions iniconfig
   uv_client::registry_client::simple_api package=iniconfig
     uv_client::cached_client::get_cacheable 
       uv_client::cached_client::read_and_parse_cache file=/home/hoppingturtles/.cache/uv/simple-v0/pypi/iniconfig.rkyv
 uv_resolver::resolver::process_request request=Versions pluggy
   uv_client::registry_client::simple_api package=pluggy
     uv_client::cached_client::get_cacheable 
       uv_client::cached_client::read_and_parse_cache file=/home/hoppingturtles/.cache/uv/simple-v0/pypi/pluggy.rkyv
 uv_resolver::resolver::process_request request=Versions packaging
   uv_client::registry_client::simple_api package=packaging
     uv_client::cached_client::get_cacheable 
       uv_client::cached_client::read_and_parse_cache file=/home/hoppingturtles/.cache/uv/simple-v0/pypi/packaging.rkyv
 uv_resolver::resolver::process_request request=Prefetch packaging *
 uv_resolver::resolver::process_request request=Prefetch pluggy >=1.3.0, <2.0
 uv_resolver::resolver::process_request request=Prefetch iniconfig *
          0.007354s   0ms DEBUG uv_client::cached_client Found stale response for: https://pypi.org/simple/pluggy/
          0.007370s   0ms DEBUG uv_client::cached_client Sending revalidation request for: https://pypi.org/simple/pluggy/
       uv_client::cached_client::revalidation_request url="https://pypi.org/simple/pluggy/"
          0.007448s   0ms DEBUG uv_client::cached_client Found fresh response for: https://pypi.org/simple/iniconfig/
error: Reading from cache archive failed: check bytes error: check failed for tuple struct member 0: check failed for slice index 0: check failed for struct member files: check failed for struct member source_dists: check failed for slice index 0: check failed for struct member file: check failed for struct member requires_python: invalid tag for enum: 108

Other packages like typing-extensions seem to upgrade just fine, only pytest is causing this issue. Also reproducible on uv 0.1.2.

uv version: 0.1.3 Build: Ubuntu 23.10, Linux kernel 6.5.0 x86_64 Python: 3.12.2 Rust: 1.76.0

[charliermarsh]

Will look into this (\cc @BurntSushi), but in the meantime, you can do uv clean (or even uv clean pytest).

[charliermarsh]

(Thank you for the clear issue!)

[harshil21]

Will look into this (\cc @BurntSushi), but in the meantime, you can do uv clean (or even uv clean pytest).

Thanks for the crazy fast response! This did indeed work for me, thanks!

[AlexWaygood]

(I just opened #1609, which is possibly a duplicate of this issue)

[charliermarsh]

Cross-posting: I believe I've confirmed locally that this was caused by https://github.com/astral-sh/uv/pull/1556. I changed one of the cached structs, and that breaks the zero-copy representation. I should've bumped the cache version.

[charliermarsh]

It might be worth adding test coverage for these kinds of bumps, or some other form of testing and enforcement. (\cc @BurntSushi just for visibility.)