I've been debugging an issue for 2 days that I think I can describe, but don't have a minimal working example I've extracted from internal code to share. We use GitLab which get's cranky if you try to cache files that live outside the "CI_PROJECT_DIR" (the directory the git repo is checked out to. So in CI we set

named_caches_dir = '.cache/pants/named_caches'

. This worked fine, but recently while trying to merge two repositories we ended up with a

.gitignore

setting of

.cache

(that is matching the

named_caches_dir

). Pants then... mostly seems to work but does whacky things like

AttributeError: module 'pendulum' has no attribute 'tz'

(where pendulum totally has said attribute) when running some goals. part of the short term answer can be "dont' do that", but: • A cache seems like a reasonable thing to want to gitignore. • I'm not sure what other bugs might be latent

Is something else writing to/making changes in .cache? Does the problem persist if you rename the pants one to .pants-cache or similar?

.Is something else writing to/making changes in .cache?

None of the code being run (the unit tests) is writing there.

Does the problem persist if you rename the pants one to .pants-cache or similar?

Amusingly

.pants-cache

is also matched by a gitignore rule in this repository. But the problem does go away with

named_caches_dir = '.los-pantalones-cache/pants/named_caches'

> (And for the second one, if doesn’t persist, does adding .pants-cache to .gitignore make it pop up again?) Yes adding

.los-pantalones-cache*

to

.gitignore

causes the error to reoccur. In case it helps (with the failure):

$ find .los-pantalones-cache -iname pendulum
.los-pantalones-cache/pants/named_caches/pex_root/venvs/747154802a68bcb895f4a6b7cf72ae22f0b79821/a0667c3b93616650d128c0fb95a0e63dda357018/lib/python3.10/site-packages/pendulum
.los-pantalones-cache/pants/named_caches/pex_root/installed_wheels/c42051da34b4b8ffb6575354a454a5472dbd414744f063d8e1c63ce45209bdb3/pendulum-2.1.2-cp310-cp310-manylinux_2_36_x86_64.whl/pendulum
$ tree .los-pantalones-cache/pants/named_caches/pex_root/venvs/747154802a68bcb895f4a6b7cf72ae22f0b79821/a0667c3b93616650d128c0fb95a0e63dda357018/lib/python3.10/site-packages/pendulum
.los-pantalones-cache/pants/named_caches/pex_root/venvs/747154802a68bcb895f4a6b7cf72ae22f0b79821/a0667c3b93616650d128c0fb95a0e63dda357018/lib/python3.10/site-packages/pendulum
├── _extensions
│   └── _helpers.cpython-310-x86_64-linux-gnu.so
├── parsing
│   └── _iso8601.cpython-310-x86_64-linux-gnu.so
└── py.typed

2 directories, 3 files

So somehow the .py files are "missing"? I was sort of hoping there was an obvious negation error in

src/rust/engine/fs/src/gitignore.rs

or something but this continues to look spooky.

Weird! Sounds like it’s clear that there’s some sort of weird interaction between cache and gitignore. Could you file an issue?