`python setup.py develop` fails

[alecjacobson]

I'm trying to learn how to write a new python binding. As a first step, I tried to build the bindings locally. When I clone this repository and issue as per the README.md

python setup.py develop

I get these errors:

running develop
running egg_info
creating igl.egg-info
writing igl.egg-info/PKG-INFO
writing dependency_links to igl.egg-info/dependency_links.txt
writing requirements to igl.egg-info/requires.txt
writing top-level names to igl.egg-info/top_level.txt
writing manifest file 'igl.egg-info/SOURCES.txt'
reading manifest file 'igl.egg-info/SOURCES.txt'
writing manifest file 'igl.egg-info/SOURCES.txt'
running build_ext
Traceback (most recent call last):
  File "setup.py", line 20, in run
    out = subprocess.check_output(['cmake', '--version'])
  File "/Users/ajx/opt/miniconda3/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/Users/ajx/opt/miniconda3/lib/python3.8/subprocess.py", line 489, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/Users/ajx/opt/miniconda3/lib/python3.8/subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/Users/ajx/opt/miniconda3/lib/python3.8/subprocess.py", line 1702, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'cmake'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "setup.py", line 71, in <module>
    setup(
  File "/Users/ajx/opt/miniconda3/lib/python3.8/site-packages/setuptools/__init__.py", line 161, in setup
    return distutils.core.setup(**attrs)
  File "/Users/ajx/opt/miniconda3/lib/python3.8/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/Users/ajx/opt/miniconda3/lib/python3.8/distutils/dist.py", line 966, in run_commands
    self.run_command(cmd)
  File "/Users/ajx/opt/miniconda3/lib/python3.8/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "/Users/ajx/opt/miniconda3/lib/python3.8/site-packages/setuptools/command/develop.py", line 38, in run
    self.install_for_development()
  File "/Users/ajx/opt/miniconda3/lib/python3.8/site-packages/setuptools/command/develop.py", line 140, in install_for_development
    self.run_command('build_ext')
  File "/Users/ajx/opt/miniconda3/lib/python3.8/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/Users/ajx/opt/miniconda3/lib/python3.8/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "setup.py", line 22, in run
    raise RuntimeError(
RuntimeError: pyigl

Are there some dependencies or prerequisites not listed in the README.md which I should take care of first?

[teseoch]

It seems that python cannot find cmake. Is it in the path?

[alecjacobson]

Seems that the script was not successfully finding my cmake. I had it installed at /Applications/CMake.app and my terminal had the alias alias cmake="/Applications/CMake.app/Contents/bin/cmake".

To avoid having to change this script, I deleted my cmake application and installed cmake via homebrew:

brew install cmake

Seems like the setup script could find it now. (It's crunching away on compilation now, but so far looks reasonable)

[alecjacobson]

I see that setup.py is trying to catch not having cmake installed and print a nice error. This didn't happen (see above). Is there a better way to detect this?

[alecjacobson]

I'm not sure about python error catching. It's currently catching OSError. Should it (also) be catching FileNotFoundError ?

[alecjacobson]

No. I think it's catching the error but somehow just printing pyigl instead of the RuntimeError message. I'll continue to debug. If anyone sees an easy fix, please let me know.