uv swallows output from build backend even in verbose mode #5893
Description
When installing a package with regular pip in verbose mode, one typically also gets output from the build backend. For example
python -m venv .venv
. .venv/bin/activate
pip install -v git+https://github.com/pybind/scikit_build_exampleConsole Output
Using pip 24.0 from /Users/burgholzer/Documents/test/.venv/lib/python3.12/site-packages/pip (python 3.12)
Collecting git+https://github.com/pybind/scikit_build_example
Cloning https://github.com/pybind/scikit_build_example to /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/pip-req-build-8wv048d_
Running command git version
git version 2.39.3 (Apple Git-146)
Running command git clone --filter=blob:none https://github.com/pybind/scikit_build_example /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/pip-req-build-8wv048d_
Cloning into '/private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/pip-req-build-8wv048d_'...
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Updating files: 100% (21/21)
Updating files: 100% (21/21), done.
Running command git rev-parse HEAD
6fbb8896ca47e83a38c491cddeaa39a8882a90f9
Resolved https://github.com/pybind/scikit_build_example to commit 6fbb8896ca47e83a38c491cddeaa39a8882a90f9
Running command git rev-parse HEAD
6fbb8896ca47e83a38c491cddeaa39a8882a90f9
Running command pip subprocess to install build dependencies
Collecting scikit-build-core>=0.3.3
Using cached scikit_build_core-0.10.1-py3-none-any.whl.metadata (20 kB)
Collecting pybind11
Using cached pybind11-2.13.1-py3-none-any.whl.metadata (9.5 kB)
Collecting packaging>=21.3 (from scikit-build-core>=0.3.3)
Using cached packaging-24.1-py3-none-any.whl.metadata (3.2 kB)
Collecting pathspec>=0.10.1 (from scikit-build-core>=0.3.3)
Using cached pathspec-0.12.1-py3-none-any.whl.metadata (21 kB)
Using cached scikit_build_core-0.10.1-py3-none-any.whl (164 kB)
Using cached pybind11-2.13.1-py3-none-any.whl (238 kB)
Using cached packaging-24.1-py3-none-any.whl (53 kB)
Using cached pathspec-0.12.1-py3-none-any.whl (31 kB)
Installing collected packages: pybind11, pathspec, packaging, scikit-build-core
Successfully installed packaging-24.1 pathspec-0.12.1 pybind11-2.13.1 scikit-build-core-0.10.1
[notice] A new release of pip is available: 24.0 -> 24.2
[notice] To update, run: pip install --upgrade pip
Installing build dependencies ... done
Running command Getting requirements to build wheel
Getting requirements to build wheel ... done
Running command Preparing metadata (pyproject.toml)
*** scikit-build-core 0.10.1 using CMake 3.29.3 (metadata_wheel)
Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: scikit_build_example
Running command Building wheel for scikit_build_example (pyproject.toml)
*** scikit-build-core 0.10.1 using CMake 3.29.3 (wheel)
*** Configuring CMake...
loading initial cache file /var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/tmpj3dkrpke/build/CMakeInit.txt
-- The CXX compiler identification is Clang 18.1.6
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /opt/homebrew/opt/llvm/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Python: /Users/burgholzer/Documents/test/.venv/bin/python3.12 (found version "3.12.4") found components: Interpreter Development.Module
-- Performing Test HAS_FLTO_THIN
-- Performing Test HAS_FLTO_THIN - Failed
-- Performing Test HAS_FLTO
-- Performing Test HAS_FLTO - Success
-- Found pybind11: /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/pip-build-env-gu20d2my/overlay/lib/python3.12/site-packages/pybind11/include (found version "2.13.1")
-- Configuring done (0.6s)
-- Generating done (0.0s)
-- Build files have been written to: /var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/tmpj3dkrpke/build
*** Building project with Ninja...
[1/2] Building CXX object CMakeFiles/_core.dir/src/main.cpp.o
[2/2] Linking CXX shared module _core.cpython-312-darwin.so
*** Installing project into wheel...
-- Install configuration: "Release"
-- Installing: /var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/tmpj3dkrpke/wheel/platlib/scikit_build_example/_core.cpython-312-darwin.so
/opt/homebrew/anaconda3/bin/strip: changes being made to the file will invalidate the code signature in: /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/tmpj3dkrpke/wheel/platlib/scikit_build_example/_core.cpython-312-darwin.so
[cctools-port]: generating fake signature for '/private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/tmpj3dkrpke/wheel/platlib/scikit_build_example/_core.cpython-312-darwin.so.strip'
*** Making wheel...
*** Created scikit_build_example-0.0.1-cp312-cp312-macosx_14_0_arm64.whl
Building wheel for scikit_build_example (pyproject.toml) ... done
Created wheel for scikit_build_example: filename=scikit_build_example-0.0.1-cp312-cp312-macosx_14_0_arm64.whl size=48328 sha256=a7d535323acde9ebe874337213f34bb2220e58d5ba2f4fe29b7b287c8d0cdfbd
Stored in directory: /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/pip-ephem-wheel-cache-02uu75hf/wheels/04/12/1d/cad1972af8fcbb02eb0abefe8236ffb3aaa4ea68c4e72a7b12
Successfully built scikit_build_example
Installing collected packages: scikit_build_example
Successfully installed scikit_build_example-0.0.1On the other hand, running the same commands with uv, i.e.,
uv venv
. .venv/bin/activate
uv pip install -v git+https://github.com/pybind/scikit_build_exampleConsole Output
DEBUG uv 0.2.33 (Homebrew 2024-08-01)
DEBUG Searching for Python interpreter in system path
DEBUG Found `cpython-3.11.5-macos-aarch64-none` at `/Users/burgholzer/Documents/test/.venv/bin/python3` (active virtual environment)
DEBUG Using Python 3.11.5 environment at .venv/bin/python3
DEBUG Acquired lock for `.venv`
DEBUG At least one requirement is not satisfied: git+https://github.com/pybind/scikit_build_example
DEBUG Using request timeout of 30s
DEBUG Fetching source distribution from Git: https://github.com/pybind/scikit_build_example
DEBUG Acquired lock for `https://github.com/pybind/scikit_build_example`
DEBUG Updating git source `Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("github.com")), port: None, path: "/pybind/scikit_build_example", query: None, fragment: None }`
DEBUG Attempting GitHub fast path for: https://api.github.com/repos/pybind/scikit_build_example/commits/HEAD
DEBUG Performing a Git fetch for: https://github.com/pybind/scikit_build_example
DEBUG reset /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/.tmp7rSS46/git-v0/checkouts/f1b0f44246bef58f/6fbb889 to 6fbb8896ca47e83a38c491cddeaa39a8882a90f9
DEBUG Fetching source distribution from Git: https://github.com/pybind/scikit_build_example
DEBUG Acquired lock for `https://github.com/pybind/scikit_build_example`
DEBUG Using existing git source `Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("github.com")), port: None, path: "/pybind/scikit_build_example", query: None, fragment: None }`
DEBUG Acquired lock for `/private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/.tmp7rSS46/built-wheels-v3/git/09879697cbfb302e/6fbb8896ca47e83a`
DEBUG Preparing metadata for: git+https://github.com/pybind/scikit_build_example
DEBUG No static `PKG-INFO` available for: git+https://github.com/pybind/scikit_build_example (MissingPkgInfo)
DEBUG Found static `pyproject.toml` for: git+https://github.com/pybind/scikit_build_example
DEBUG No workspace root found, using project root
DEBUG Solving with installed Python version: 3.11.5
DEBUG Adding direct dependency: scikit-build-example*
DEBUG Searching for a compatible version of scikit-build-example @ git+https://github.com/pybind/scikit_build_example (*)
DEBUG Tried 1 versions: scikit-build-example 1
DEBUG Split specific environment resolution took 0.001s
Resolved 1 package in 1.40s
DEBUG Identified uncached requirement: scikit-build-example @ git+https://github.com/pybind/scikit_build_example
DEBUG Fetching source distribution from Git: https://github.com/pybind/scikit_build_example
DEBUG Acquired lock for `https://github.com/pybind/scikit_build_example`
DEBUG Using existing git source `Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("github.com")), port: None, path: "/pybind/scikit_build_example", query: None, fragment: None }`
DEBUG Acquired lock for `/private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/.tmp7rSS46/built-wheels-v3/git/ed9999dc690d99b0/6fbb8896ca47e83a`
DEBUG Building: scikit-build-example @ git+https://github.com/pybind/scikit_build_example@6fbb8896ca47e83a38c491cddeaa39a8882a90f9
INFO Ignoring empty directory
DEBUG Solving with installed Python version: 3.11.5
DEBUG Adding direct dependency: scikit-build-core>=0.3.3
DEBUG Adding direct dependency: pybind11*
DEBUG No cache entry for: https://pypi.org/simple/scikit-build-core/
DEBUG No cache entry for: https://pypi.org/simple/pybind11/
DEBUG No cache entry for: https://files.pythonhosted.org/packages/84/fb/1a249de406daf2b4ebd2d714b739e8519034617daec085e3833c1a3ed57c/pybind11-2.13.1-py3-none-any.whl.metadata
DEBUG Searching for a compatible version of scikit-build-core (>=0.3.3)
DEBUG Selecting: scikit-build-core==0.10.1 [compatible] (scikit_build_core-0.10.1-py3-none-any.whl)
DEBUG No cache entry for: https://files.pythonhosted.org/packages/df/1a/6a3d2b5d2ce1b87dbc9d58592cf67741f97eafee68e8008c2f56f8fc1be6/scikit_build_core-0.10.1-py3-none-any.whl.metadata
DEBUG Adding transitive dependency for scikit-build-core==0.10.1: packaging>=21.3
DEBUG Adding transitive dependency for scikit-build-core==0.10.1: pathspec>=0.10.1
DEBUG Searching for a compatible version of pybind11 (*)
DEBUG Selecting: pybind11==2.13.1 [compatible] (pybind11-2.13.1-py3-none-any.whl)
DEBUG No cache entry for: https://pypi.org/simple/packaging/
DEBUG No cache entry for: https://pypi.org/simple/pathspec/
DEBUG No cache entry for: https://files.pythonhosted.org/packages/cc/20/ff623b09d963f88bfde16306a54e12ee5ea43e9b597108672ff3a408aad6/pathspec-0.12.1-py3-none-any.whl.metadata
DEBUG Searching for a compatible version of packaging (>=21.3)
DEBUG Selecting: packaging==24.1 [compatible] (packaging-24.1-py3-none-any.whl)
DEBUG No cache entry for: https://files.pythonhosted.org/packages/08/aa/cc0199a5f0ad350994d660967a8efb233fe0416e4639146c089643407ce6/packaging-24.1-py3-none-any.whl.metadata
DEBUG Searching for a compatible version of pathspec (>=0.10.1)
DEBUG Selecting: pathspec==0.12.1 [compatible] (pathspec-0.12.1-py3-none-any.whl)
DEBUG Tried 4 versions: packaging 1, pathspec 1, pybind11 1, scikit-build-core 1
DEBUG Split specific environment resolution took 0.324s
DEBUG Installing in packaging==24.1, pathspec==0.12.1, pybind11==2.13.1, scikit-build-core==0.10.1 in /private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/.tmp7rSS46/builds-v0/.tmpkbEwxR
DEBUG Identified uncached requirement: packaging==24.1
DEBUG Identified uncached requirement: pathspec==0.12.1
DEBUG Identified uncached requirement: pybind11==2.13.1
DEBUG Identified uncached requirement: scikit-build-core==0.10.1
DEBUG Downloading and building requirements for build: packaging==24.1, pathspec==0.12.1, pybind11==2.13.1, scikit-build-core==0.10.1
DEBUG No cache entry for: https://files.pythonhosted.org/packages/84/fb/1a249de406daf2b4ebd2d714b739e8519034617daec085e3833c1a3ed57c/pybind11-2.13.1-py3-none-any.whl
DEBUG No cache entry for: https://files.pythonhosted.org/packages/df/1a/6a3d2b5d2ce1b87dbc9d58592cf67741f97eafee68e8008c2f56f8fc1be6/scikit_build_core-0.10.1-py3-none-any.whl
DEBUG No cache entry for: https://files.pythonhosted.org/packages/cc/20/ff623b09d963f88bfde16306a54e12ee5ea43e9b597108672ff3a408aad6/pathspec-0.12.1-py3-none-any.whl
DEBUG No cache entry for: https://files.pythonhosted.org/packages/08/aa/cc0199a5f0ad350994d660967a8efb233fe0416e4639146c089643407ce6/packaging-24.1-py3-none-any.whl
DEBUG Installing build requirements: pathspec==0.12.1, scikit-build-core==0.10.1, pybind11==2.13.1, packaging==24.1
DEBUG Calling `scikit_build_core.build.get_requires_for_build_wheel()`
DEBUG Calling `scikit_build_core.build.build_wheel("/private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/.tmp7rSS46/built-wheels-v3/git/ed9999dc690d99b0/6fbb8896ca47e83a/.tmp0CQXob", {}, None)`
DEBUG Finished building: scikit-build-example @ git+https://github.com/pybind/scikit_build_example@6fbb8896ca47e83a38c491cddeaa39a8882a90f9
Prepared 1 package in 8.05s
Installed 1 package in 1ms
+ scikit-build-example==0.0.1 (from git+https://github.com/pybind/scikit_build_example@6fbb8896ca47e83a38c491cddeaa39a8882a90f9)Note that there is no output between the following two lines
DEBUG Calling `scikit_build_core.build.build_wheel("/private/var/folders/94/pdwvr9792913hjv6bw94gg6r0000gn/T/.tmp7rSS46/built-wheels-v3/git/ed9999dc690d99b0/6fbb8896ca47e83a/.tmp0CQXob", {}, None)`
DEBUG Finished building: scikit-build-example @ git+https://github.com/pybind/scikit_build_example@6fbb8896ca47e83a38c491cddeaa39a8882a90f9
which is where I would have expected to see the information from the build backend similar to how pip displays the information.
Am I overlooking something or is uv swallowing the build system output? If so, is this intended (even in verbose mode)?
Note that the build backend in question is scikit-build-core. I am not quite sure whether that contributes to the problem.
This was tested on uv 0.2.33 on macOS Catalina. However, this dates back to at least uv 0.2.21.