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uv build fails on GitLab where cache directory is in source directory #20050
Description
Summary
On GitLab, cache directories are relative to the project directory:
Both artifacts and caches define their paths relative to the project directory, and can’t link to files outside it.
uv's own GitLab docs also show this pattern.
uv build fails in this scenario due to #19991
The build backend we use does not include the cache directory, so this hard error seems rather unfortunate. Ideally we wouldn't have to disable the cache.
Platform
N/A
Version
0.11.25
Python version
N/A
Reacted by aqm577 and Sillocan
Activity
Sillocan commentedon Jun 29, 2026
Agh, I just ran into this as well and its a full blocker for caching. Gitlab's caching requires that the folder must be inside the project directory.
Command that fails:
Sillocan commentedon Jun 29, 2026
@woodruffw I hate to @ people, but I think your opinion on the path forward for this will be valuable. I think we need a workaround for #19991 since this blocks caching with Gitlab CICD.
I've recreated the issue in an example repo: uv_issue_20050. I could not find a successful workaround with v0.11.25 of uv 😭
zanieb commentedon Jun 30, 2026
Thanks for the reports. Let me know if #20056 is not sufficient.
Warn when the build cache is inside the source directory (astral-sh#2…
Sillocan commentedon Jun 30, 2026
Thank you for the quick turnaround! It's passing on main now https://gitlab.com/Sillocan/uv_issue_20050/-/jobs/15095330950#L28