Importing wlroots.ffi_build from system installation fails

[m-col]

It seems the ffi.verify() call wants write access to neighbouring files, and so importing wlroots.ffi_build raises a PermissionError when a user does not havewrite permissions to /usr/lib. This is the stack trace:

>>> import wlroots.ffi_build
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.10/site-packages/wlroots/ffi_build.py", line 2408, in <module>
    check_version()
  File "/usr/lib/python3.10/site-packages/wlroots/ffi_build.py", line 44, in check_version
    wlroots_version = load_wlroots_version()
  File "/usr/lib/python3.10/site-packages/wlroots/ffi_build.py", line 36, in load_wlroots_version
    lib = ffi.verify("#include <wlr/version.h>")
  File "/usr/lib/python3.10/site-packages/cffi/api.py", line 468, in verify
    lib = self.verifier.load_library()
  File "/usr/lib/python3.10/site-packages/cffi/verifier.py", line 104, in load_library
    self._write_source()
  File "/usr/lib/python3.10/site-packages/cffi/verifier.py", line 193, in _write_source
    with open(self.sourcefilename, "w") as fp:
PermissionError: [Errno 13] Permission denied: '/usr/lib/python3.10/site-packages/wlroots/__pycache__/_cffi__x58fcf130xd9c61baf.c'

This is coming from the check_version(). Perhaps we can have some kind of flag to disable the check? The use-case here is not building pywlroots per se, but building another CFFI module that depends on it.

[flacjacket]

Thanks for the report here. I just pushed a change that should let us skip the check if that error is hit.

[m-col]

Brilliant, thanks!