uv tool management ignores environment and always uses CLT python #23973

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Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:

  darktable

HOMEBREW_VERSION: 7.0.1-15-g82ea9cb
ORIGIN: https://github.com/Homebrew/brew
HEAD: 82ea9cb60b55c00f3a65bdffb30db97a82d1e0d7
Last commit: 2 hours ago
Branch: main
Core tap HEAD: 2c70d8df74f9f227fefd7e197961d4cde9481fd2
Core tap last commit: 2 hours ago
Core cask tap HEAD: 7cb180869c4ff9cd6a822a92d8267a1579ef30de
Core cask tap last commit: 3 hours ago
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_NO_ANALYTICS: set
no_proxy: *
Homebrew Ruby: 4.0.6 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/4.0.6_2/bin/ruby
CPU: octa-core 64-bit arm_firestorm_icestorm
Clang: 21.0.0 build 2100
Git: 2.55.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 26.6.2-arm64
CLT: 27.0.0.0.1788430756
Xcode: N/A
Rosetta 2: false

$ mkdir test && cd test
$ git init
$ cat <<EOF > .pre-commit-config.yaml
heredoc> repos:
heredoc>   - repo: https://github.com/PyCQA/isort
heredoc>     rev: 9.0.1
heredoc>     hooks:
heredoc>       - id: isort
heredoc> EOF
$ export UV_PYTHON=$(brew --prefix python)/bin/python3  # optional if your Path is set up correctly
$ brew bundle --file=- <<EOF
heredoc> brew "uv"
heredoc> uv "pre-commit"
heredoc> EOF
Installing uv
Installing pre-commit
$ $(uv tool dir)/pre-commit/bin/python --version
Python 3.9.6
$ ls -l $(uv tool dir)/pre-commit/bin/python
lrwxr-xr-x@ 1 shoeffner  staff  51 Sep 15 09:13 /Users/shoeffner/.local/share/uv/tools/pre-commit/bin/python -> /Library/Developer/CommandLineTools/usr/bin/python3
$ pre-commit install-hooks
[INFO] Installing environment for https://github.com/PyCQA/isort.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
An unexpected error has occurred: CalledProcessError: command: ('/Users/shoeffner/.cache/pre-commit/reporll5792n/py_env-python3/bin/python', '-mpip', 'install', '.')
return code: 1
stdout:
    Processing ./.
      Installing build dependencies: started
      Installing build dependencies: finished with status 'done'
      Getting requirements to build wheel: started
      Getting requirements to build wheel: finished with status 'done'
      Preparing metadata (pyproject.toml): started
      Preparing metadata (pyproject.toml): finished with status 'done'
    INFO: pip is looking at multiple versions of isort to determine whichversion is compatible with other requirements. This could take a while.
stderr:
    ERROR: Package 'isort' requires a different Python: 3.9.6 not in '>=3.10.0'
Check the log at /Users/shoeffner/.cache/pre-commit/pre-commit.log
$ brew bundle remove --uv pre-commit --file=- <<EOF  # unrelated issue: this doesn't seem to work
heredoc> uv "pre-commit"
heredoc> EOF
$ ls $(uv tool dir)/pre-commit
CACHEDIR.TAG    lib             uv-receipt.toml
bin             pyvenv.cfg
$ uv tool uninstall pre-commit
Uninstalled 1 executable: pre-commit
$ uv tool install pre-commit
Resolved 10 packages in 24ms
Installed 10 packages in 34ms
 + cfgv==3.5.0
 + distlib==0.4.3
 + filelock==3.32.6
 + identify==2.6.19
 + nodeenv==1.10.0
 + platformdirs==4.11.8
 + pre-commit==4.6.2
 + python-discovery==1.6.0
 + pyyaml==6.0.3
 + virtualenv==21.7.9
Installed 1 executable: pre-commit
$ $(uv tool dir)/pre-commit/bin/python --version
Python 3.14.7
$ ls -l $(uv tool dir)/pre-commit/bin/python
lrwxr-xr-x@ 1 shoeffner  staff  44 Sep 15 09:29 /Users/shoeffner/.local/share/uv/tools/pre-commit/bin/python -> /opt/homebrew/opt/python@3.14/bin/python3.14
$ pre-commit install-hooks
$ pre-commit run --all --all-files
isort................................................(no files to check) Skipped