pdm install failed when using VCS dependencies with "subdirectory" in URL

[lc6chang]

• I have searched the issue tracker and believe that this is not a duplicate.

Make sure you run commands with -v flag before pasting the output.

Steps to reproduce

• Prepare an empty pdm workspace:

  mkdir pdmworkspace
  cd pdmworkspace

• Create pyproject.toml with:

  [project]
  name = ""
  version = ""
  description = ""
  authors = []
  dependencies = [
      'testpdm1@git+ssh://[email protected]/lc6chang/test-pdm@master#subdirectory=test_pdm1',
      'testpdm2@git+ssh://[email protected]/lc6chang/test-pdm@master#subdirectory=test_pdm2',
  ]
  requires-python = ">=3.10"
  
  [tool.pdm]

• Install by pdm:

  pdm install -v

Actual behavior

Failed with:

Lock file does not exist
Updating the lock file...
python.use_venv is on, creating a virtualenv for this project...
...
STATUS: Resolving dependencies
...
STATUS: Resolving: new pin python>=3.10
...
STATUS: Resolving: new pin testpdm1 0.0.0
...
STATUS: Resolving: new pin testpdm2 0.0.0
...
STATUS: Fetching hashes for resolved packages...
...
🔒 Lock successful
Changes are written to pdm.lock.
STATUS: Resolving packages from lockfile...
STATUS: Fetching hashes for resolved packages...
pdm.termui: Fetching hashes for testpdm1@git+ssh://[email protected]/lc6chang/test-pdm@3ec8f94e2862a135f349daf3d478cf5af97364dc
pdm.termui: Fetching hashes for testpdm2@git+ssh://[email protected]/lc6chang/test-pdm@3ec8f94e2862a135f349daf3d478cf5af97364dc
Synchronizing working set with lock file: 2 to add, 0 to update, 0 to remove
...
unearth.vcs.git: Cloning ssh://***@github.com/lc6chang/test-pdm (revision: 3ec8f94e2862a135f349daf3d478cf5af97364dc) to /var/...
unearth.vcs.git: Cloning ssh://***@github.com/lc6chang/test-pdm (revision: 3ec8f94e2862a135f349daf3d478cf5af97364dc) to /var/...
unearth.vcs.git: Resolved ssh://***@github.com/lc6chang/test-pdm to commit 3ec8f94e2862a135f349daf3d478cf5af97364dc
pdm.termui: Preparing isolated env for PEP 517 build...
unearth.vcs.git: Resolved ssh://***@github.com/lc6chang/test-pdm to commit 3ec8f94e2862a135f349daf3d478cf5af97364dc
pdm.termui: Preparing isolated env for PEP 517 build...
pdm.termui: Saving wheel to cache: <Link git+ssh://***@github.com/lc6chang/test-pdm@3ec8f94e2862a135f349daf3d478cf5af97364dc (from None)>
pdm.termui: Running PEP 517 backend to build a wheel for <Link git+ssh://***@github.com/lc6chang/test-pdm@3ec8f94e2862a135f349daf3d478cf5af97364dc (from None)>
pdm.termui: Saving wheel to cache: <Link git+ssh://***@github.com/lc6chang/test-pdm@3ec8f94e2862a135f349daf3d478cf5af97364dc (from None)>
pdm.termui: Running PEP 517 backend to build a wheel for <Link git+ssh://***@github.com/lc6chang/test-pdm@3ec8f94e2862a135f349daf3d478cf5af97364dc (from None)>
pdm.termui: error: Multiple top-level packages discovered in a flat-layout: ['test_pdm2', 'test_pdm1'].
pdm.termui: 
pdm.termui: To avoid accidental inclusion of unwanted files or directories,
pdm.termui: setuptools will not proceed with this build.
pdm.termui: 
pdm.termui: If you are trying to create a single distribution with multiple packages
pdm.termui: on purpose, you should not rely on automatic discovery.
pdm.termui: Instead, consider the following options:
pdm.termui: 
pdm.termui: 1. set up custom discovery (`find` directive with `include` or `exclude`)
pdm.termui: 2. use a `src-layout`
pdm.termui: 3. explicitly set `py_modules` or `packages` with a list of names
pdm.termui: 
pdm.termui: To find more information, look for "package discovery" on setuptools docs.
pdm.termui: error: Multiple top-level packages discovered in a flat-layout: ['test_pdm2', 'test_pdm1'].
pdm.termui: 
pdm.termui: To avoid accidental inclusion of unwanted files or directories,
pdm.termui: setuptools will not proceed with this build.
pdm.termui: 
pdm.termui: If you are trying to create a single distribution with multiple packages
pdm.termui: on purpose, you should not rely on automatic discovery.
pdm.termui: Instead, consider the following options:
pdm.termui: 
pdm.termui: 1. set up custom discovery (`find` directive with `include` or `exclude`)
pdm.termui: 2. use a `src-layout`
pdm.termui: 3. explicitly set `py_modules` or `packages` with a list of names
pdm.termui: 
pdm.termui: To find more information, look for "package discovery" on setuptools docs.
  ✖ Install testpdm2 0.0.0 failed
  ✖ Install testpdm1 0.0.0 failed
...

Expected behavior

Lock file does not exist
Updating the lock file...
python.use_venv is on, creating a virtualenv for this project...
Virtualenv is created successfully at ...
🔒 Lock successful
Changes are written to pdm.lock.
Synchronizing working set with lock file: 2 to add, 0 to update, 0 to remove

  ✔ Install testpdm1 0.0.0 successful
  ✔ Install testpdm2 0.0.0 successful

🎉 All complete!

Environment Information

# Paste the output of `pdm info && pdm info --env` below:
PDM version:
  2.4.0
Python Interpreter:
  /Users/myuser/pdmworkspace/.venv/bin/python (3.10)
Project Root:
  /Users/myuser/pdmworkspace
Project Packages:
  None
{
  "implementation_name": "cpython",
  "implementation_version": "3.10.8",
  "os_name": "posix",
  "platform_machine": "x86_64",
  "platform_release": "18.6.0",
  "platform_system": "Darwin",
  "platform_version": "Darwin Kernel Version 18.6.0: Sun Apr 28 18:06:45 PDT 2019; root:xnu-4903.261.4~6/RELEASE_X86_64",
  "python_full_version": "3.10.8",
  "platform_python_implementation": "CPython",
  "python_version": "3.10",
  "sys_platform": "darwin"
}

[lc6chang]

If I downgrade pdm to 2.1.3, it can be installed successfully; if I downgrade pdm to 2.1.4, it failed with a different error:

🔒 Lock successful
Changes are written to pdm.lock.
Synchronizing working set with lock file: 2 to add, 0 to update, 0 to remove

unearth.vcs.git: Cloning ssh://***@github.com/lc6chang/test-pdm (revision: 3ec8f94e2862a135f349daf3d478cf5af97364dc) to /var/...
unearth.vcs.git: Cloning ssh://***@github.com/lc6chang/test-pdm (revision: 3ec8f94e2862a135f349daf3d478cf5af97364dc) to /var/...
unearth.vcs.git: Resolved ssh://***@github.com/lc6chang/test-pdm to commit 3ec8f94e2862a135f349daf3d478cf5af97364dc
unearth.vcs.git: Resolved ssh://***@github.com/lc6chang/test-pdm to commit 3ec8f94e2862a135f349daf3d478cf5af97364dc
pdm.termui: Preparing isolated env for PEP 517 build...
pdm.termui: Preparing isolated env for PEP 517 build...
  ✖ Install testpdm2 0.0.0 failed
  ✖ Install testpdm1 0.0.0 failed
pdm.termui: Error occurs: 
...
  File ".../lib/python3.10/site-packages/pdm/pep517/base.py", line 143, in _read_pyproject_toml
    raise ProjectError("No pyproject.toml found")
pdm.pep517.exceptions.ProjectError: No pyproject.toml found