PosixPath TypeError with `poetry install` on 0.12.1

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: MacOS 10.13.6
• Poetry version: Poetry 0.12.1
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/phobologic/07c8a56f7f97b981ac046b9ee8d09a64

Issue

We’ve been using poetry internally at my company for a project for a while now and it has worked well, but since updating to poetry .12.1, whenever we do a poetry install in a fresh (blank) environment, we end up getting this error:

[TypeError]
coercing to Unicode: need string or buffer, PosixPath found

Exception trace:
 /Users/mike/Library/Python/2.7/lib/python/site-packages/cleo/application.py in run() at line 94
   status_code = self.do_run(input_, output_)
 /Users/mike/Library/Python/2.7/lib/python/site-packages/poetry/console/application.py in do_run() at line 88
   return super(Application, self).do_run(i, o)
 /Users/mike/Library/Python/2.7/lib/python/site-packages/cleo/application.py in do_run() at line 197
   status_code = command.run(input_, output_)
 /Users/mike/Library/Python/2.7/lib/python/site-packages/poetry/console/commands/command.py in run() at line 77
   return super(BaseCommand, self).run(i, o)
 /Users/mike/Library/Python/2.7/lib/python/site-packages/cleo/commands/base_command.py in run() at line 136
   self.initialize(input_, output_)
 /Users/mike/Library/Python/2.7/lib/python/site-packages/poetry/console/commands/env_command.py in initialize() at line 16
   o, self.poetry.package.name, cwd=self.poetry.file.parent
 /Users/mike/Library/Python/2.7/lib/python/site-packages/poetry/console/commands/command.py in poetry() at line 62
   return self.get_application().poetry
 /Users/mike/Library/Python/2.7/lib/python/site-packages/poetry/console/application.py in poetry() at line 60
   self._poetry = Poetry.create(os.getcwd())
 /Users/mike/Library/Python/2.7/lib/python/site-packages/poetry/poetry.py in create() at line 191
   shutil.move(old_lock, lock)
 /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py in move() at line 283
   if os.path.isdir(dst):
 /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/genericpath.py in isdir() at line 49
   st = os.stat(s)

install [--no-dev] [--dry-run] [-E|--extras EXTRAS] [--develop DEVELOP]

Thanks for any help you can provide!

[sdispater]

@phobologic Yes please. It will be easier to track the issue that way.

[sdispater]

I just published the 0.12.2 release which should fix the issue!