Wheel building fails with stack trace when symlink to external path is encountered

• Poetry version: 1.3.1
• Python version: 3.8
• OS version and name: Ubuntu 20.04
• pyproject.toml: (default generated)

• I am on the latest stable Poetry version, installed using a recommended method.
• I have searched the issues of this repo and believe that this is not a duplicate.
• I have consulted the FAQ and blog for any relevant entries or release notes.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option) and have included the output below.

Issue

If the code directory contains a venv, poetry fails with a ValueError such as '/usr/bin/python3.8' does not start with '/home/konsti/a'. I don't need virtualenv inside the code directory to be supported, but rather a confusing error message; The current one makes it seem like the activated python is badly broken.

$ poetry init -n
$ mkdir a
$ touch a/__init__.py
$ touch README.md
$ poetry build -f wheel
Building a (0.1.0)
  - Building wheel
  - Built a-0.1.0-py3-none-any.whl
$ virtualenv a/.venv
created virtual environment CPython3.8.10.final.0-64 in 159ms
  creator CPython3Posix(dest=/home/konsti/a/a/.venv, clear=False, no_vcs_ignore=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/konsti/.local/share/virtualenv)
    added seed packages: pip==22.3.1, setuptools==65.6.3, wheel==0.38.4
  activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator
$ poetry build -f wheel
Building a (0.1.0)
  - Building wheel

'/usr/bin/python3.8' does not start with '/home/konsti/a'
$ poetry build -f wheel -vvv
Loading configuration file /home/konsti/.config/pypoetry/config.toml
Using virtualenv: /home/konsti/a/.venv
Building a (0.1.0)
  - Building wheel
  - Adding: /home/konsti/a/a/.venv/.gitignore
  - Adding: /home/konsti/a/a/.venv/bin/activate
  - Adding: /home/konsti/a/a/.venv/bin/activate.csh
  - Adding: /home/konsti/a/a/.venv/bin/activate.fish
  - Adding: /home/konsti/a/a/.venv/bin/activate.nu
  - Adding: /home/konsti/a/a/.venv/bin/activate.ps1
  - Adding: /home/konsti/a/a/.venv/bin/activate_this.py
  - Adding: /home/konsti/a/a/.venv/bin/pip
  - Adding: /home/konsti/a/a/.venv/bin/pip-3.8
  - Adding: /home/konsti/a/a/.venv/bin/pip3
  - Adding: /home/konsti/a/a/.venv/bin/pip3.8

  Stack trace:

  13  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/cleo/application.py:327 in run
       325│ 
       326│             try:
     → 327│                 exit_code = self._run(io)
       328│             except BrokenPipeError:
       329│                 # If we are piped to another process, it may close early and send a

  12  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/console/application.py:190 in _run
       188│         self._load_plugins(io)
       189│ 
     → 190│         exit_code: int = super()._run(io)
       191│         return exit_code
       192│ 

  11  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/cleo/application.py:431 in _run
       429│             io.input.interactive(interactive)
       430│ 
     → 431│         exit_code = self._run_command(command, io)
       432│         self._running_command = None
       433│ 

  10  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/cleo/application.py:473 in _run_command
       471│ 
       472│         if error is not None:
     → 473│             raise error
       474│ 
       475│         return terminate_event.exit_code

   9  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/cleo/application.py:457 in _run_command
       455│ 
       456│             if command_event.command_should_run():
     → 457│                 exit_code = command.run(io)
       458│             else:
       459│                 exit_code = ConsoleCommandEvent.RETURN_CODE_DISABLED

   8  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/cleo/commands/base_command.py:119 in run
       117│         io.input.validate()
       118│ 
     → 119│         status_code = self.execute(io)
       120│ 
       121│         if status_code is None:

   7  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/cleo/commands/command.py:62 in execute
        60│ 
        61│         try:
     →  62│             return self.handle()
        63│         except KeyboardInterrupt:
        64│             return 1

   6  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/console/commands/build.py:34 in handle
        32│ 
        33│             builder = Builder(self.poetry)
     →  34│             builder.build(fmt, executable=env.python)
        35│ 
        36│         return 0

   5  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/core/masonry/builder.py:33 in build
        31│ 
        32│         for builder in builders:
     →  33│             builder(self._poetry, executable=executable).build()
        34│ 

   4  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/core/masonry/builders/wheel.py:117 in build
       115│                 self._add_pth(zip_file)
       116│             elif self._poetry.package.build_should_generate_setup():
     → 117│                 self._copy_module(zip_file)
       118│                 self._build(zip_file)
       119│             else:

   3  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/core/masonry/builders/wheel.py:232 in _copy_module
       230│ 
       231│     def _copy_module(self, wheel: zipfile.ZipFile) -> None:
     → 232│         to_add = self.find_files_to_add()
       233│ 
       234│         # Walk the files and compress them,

   2  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/core/masonry/builders/builder.py:199 in find_files_to_add
       197│ 
       198│                 if self.is_excluded(
     → 199│                     include_file.relative_to_project_root()
       200│                 ) and isinstance(include, PackageInclude):
       201│                     continue

   1  ~/.local/share/pypoetry/venv/lib/python3.8/site-packages/poetry/core/masonry/builders/builder.py:392 in relative_to_project_root
       390│ 
       391│     def relative_to_project_root(self) -> Path:
     → 392│         return self.path.relative_to(self.project_root)
       393│ 
       394│     def relative_to_source_root(self) -> Path:

  ValueError

  '/usr/bin/python3.8' does not start with '/home/konsti/a'

  at /usr/lib/python3.8/pathlib.py:908 in relative_to
       904│         n = len(to_abs_parts)
       905│         cf = self._flavour.casefold_parts
       906│         if (root or drv) if n == 0 else cf(abs_parts[:n]) != cf(to_abs_parts):
       907│             formatted = self._format_parsed_parts(to_drv, to_root, to_parts)
    →  908│             raise ValueError("{!r} does not start with {!r}"
       909│                              .format(str(self), str(formatted)))
       910│         return self._from_parsed_parts('', root if n == 1 else '',
       911│                                        abs_parts[n:])
       912│ 

Reproduce with poetry build -f wheel after creating a/.venv, then start at poetry/core/masonry/builders/builder.py:relative_to_project_root and follow the call from poetry/core/masonry/builders/wheel.py:_copy_module. Done means a project containing a venv or external symlink no longer produces the raw ValueError stack trace and instead reports the intended failure clearly.