`uv run --preview-features=target-workspace-discovery` fails needlessly reading `uv.toml`, `pyproject.toml` from inaccessible cwd

[andersk]

Summary

$ uv init /tmp/project
$ uv --project=/tmp/project add requests
$ echo 'import requests; print(requests.__version__)' > /tmp/project/main.py
$ mkdir /tmp/elsewhere
$ cd /tmp/elsewhere
$ uv run --preview-features=target-workspace-discovery /tmp/project/main.py
2.32.5
$ chmod 000 .
$ uv run --preview-features=target-workspace-discovery /tmp/project/main.py
error: failed to open file `/tmp/elsewhere/uv.toml`: Permission denied (os error 13)

This comes up when an administrator with cwd /root uses su to run a script as another user who can’t read /root. For example, a Zulip administrator expects to be able to run su zulip -c '/home/zulip/deployments/current/manage.py backup'.

(Rereported from #11302 (comment) with a more streamlined test case.)

Please merge this fix:

• Skip redundant project configuration parsing for uv run #17890

Platform

Linux amd64

Version

0.11.0

Python version

Python 3.14.3

[zanieb]

We'll take another look, thanks!