pip 19.0.2: IndexError when building wheel on osx #6252
Description
Environment
- pip version: 19.0.2
- Python version: 3.6
- OS: macos 10.13
- Platform: Travis-ci
The error was observed on travis-ci build's using Miniconda with an environment that contains both conda and pip packages.
Description
It seems release 19.0.2 breaks something related to wheel building under certain circumstances.
The problem started happening yesterday and it popped up exactly after 19.0.2 was released. The build was succeeding on 19.0.1, and as soon as 19.0.2 was available, the build started failing. See successful build #10 and failed build #11. After pinning pip back to 19.0.1, the build started working again.
I don't have a clear idea of what exactly fails, but it seems to be related to cvxpy and its dependency scs, but it is not clear to me if this is in any way connected to the root cause, or is only the visible side-effect.
How to Reproduce
- Build using this travis file
- If pip version is not pinned, and it uses 19.0.2, an error occurs (see below for tracebacks and full output).
Output
The full build output is available directly on travis: https://travis-ci.com/gramaziokohler/robotic_assembly_workshop/builds/100338039
Stored in directory: /Users/travis/Library/Caches/pip/wheels/1d/2f/99/1594715f229f93f235d8b370a3b6f16e2b00fbac1087a99902
Building wheel for scs (setup.py) ... done
Exception:
Traceback (most recent call last):
File "/Users/travis/miniconda3/envs/workshop/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 179, in main
status = self.run(options, args)
File "/Users/travis/miniconda3/envs/workshop/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 355, in run
session=session, autobuilding=True
File "/Users/travis/miniconda3/envs/workshop/lib/python3.6/site-packages/pip/_internal/wheel.py", line 980, in build
python_tag=python_tag,
File "/Users/travis/miniconda3/envs/workshop/lib/python3.6/site-packages/pip/_internal/wheel.py", line 813, in _build_one
python_tag=python_tag)
File "/Users/travis/miniconda3/envs/workshop/lib/python3.6/site-packages/pip/_internal/wheel.py", line 821, in _build_one_inside_env
wheel_path = builder(req, temp_dir.path, python_tag=python_tag)
File "/Users/travis/miniconda3/envs/workshop/lib/python3.6/site-packages/pip/_internal/wheel.py", line 898, in _build_one_legacy
return os.path.join(tempd, sorted(os.listdir(tempd))[0])
IndexError: list index out of range