Multiple dependencies pointing to one git repo creates git lockfile error

• Poetry version: 1.7.0
• Python version: 3.9
• OS version and name: Whatever is used by docker image python:3.9-slim

Disclaimer: I do not have enough time to sanitize the real code behind the error I encountered or create a reproducible example.

Issue

When two different dependencies point at different sub-directories and tags for the same git repository an error is produced by poetry install as it tries to use the same cloned repository for both tags simultaneously. The error does not occur when the maximum number of workers for poetry install is set to 1.

   FileExistsError
 
   [Errno 17] File exists: b'/poetry-build/.venv/src/<repo-name>/.git/refs/heads/master.lock'
 
   at ~/.local/share/pypoetry/venv/lib/python3.9/site-packages/dulwich/file.py:148 in __init__
       144│             self._lockfilename = self._filename + b".lock"
       145│         else:
       146│             self._lockfilename = self._filename + ".lock"
       147│         try:
     → 148│             fd = os.open(
       149│                 self._lockfilename,
       150│                 os.O_RDWR | os.O_CREAT | os.O_EXCL | getattr(os, "O_BINARY", 0),
       151│                 mask,
       152│             )

In this case there are multiple python packages in a single mono-repo that a service includes as dependencies. Versioning is handled by git tags. For any service that specifies more than one package from the mono-repo as dependencies (using git+ssh) the error occurs.

Begin with Poetry's git dependency handling during poetry install and the Dulwich lock path shown at dulwich/file.py:148; construct a minimal case with two packages from one tagged monorepo. Done means concurrent installation no longer raises FileExistsError for the shared repository, while the single-worker comparison remains understood.