Trying to add dependency from url - KeyError: 'The package is missing a name or version'

[jgraeb]

I am trying to add a package from a url, specifically spot (https://spot.lre.epita.fr/install.html). When running the following command:
pdm add "spot @ http://www.lrde.epita.fr/dload/spot/spot-2.12.tar.gz" -v
I get an error message:
KeyError: 'The package is missing a name or version'

Is there a way to manually specify the version for a dependency?

Full message:

Adding packages to default dependencies: spot @ 
http://www.lrde.epita.fr/dload/spot/spot-2.12.tar.gz
STATUS: Resolving dependencies
STATUS: Resolve for environment (>=3.9)
pdm.termui: ======== Start resolving requirements ========
pdm.termui:   spot @ http://www.lrde.epita.fr/dload/spot/spot-2.12.tar.gz
pdm.termui:   Adding requirement spot @ http://www.lrde.epita.fr/dload/spot/spot-2.12.tar.gz
pdm.termui:   Adding requirement python>=3.9
pdm.termui: ======== Starting round 0 ========
unearth.preparer: Downloading <Link http://www.lrde.epita.fr/dload/spot/spot-2.12.tar.gz (from None)> (7.8 MB)
pdm.termui: Running PEP 517 backend to get metadata for <Link http://www.lrde.epita.fr/dload/spot/spot-2.12.tar.gz (from None)>
pdm.termui: Preparing environment(Isolated mode) for PEP 517 build...
pdm.termui: ======== Start resolving requirements ========
pdm.termui:   wheel
pdm.termui:   setuptools>=40.8.0
pdm.termui:   python==3.11.5
pdm.termui:   Adding requirement wheel
pdm.termui:   Adding requirement setuptools>=40.8.0
pdm.termui:   Adding requirement python==3.11.5
pdm.termui: ======== Starting round 0 ========
pdm.termui: Pinning: python None
pdm.termui: ======== Ending round 0 ========
pdm.termui: ======== Starting round 1 ========
pdm.termui: Pinning: setuptools 72.1.0
pdm.termui: ======== Ending round 1 ========
pdm.termui: ======== Starting round 2 ========
pdm.termui: Pinning: wheel 0.43.0
pdm.termui: ======== Ending round 2 ========
pdm.termui: ======== Starting round 3 ========
pdm.termui: ======== Resolution Result ========
pdm.termui: Stable pins:
pdm.termui:       python None
pdm.termui:   setuptools 72.1.0
pdm.termui:        wheel 0.43.0
pdm.termui: Installing [email protected]...
pdm.termui: Using cached response for https://files.pythonhosted.org/packages/e1/58/e0ef3b9974a04ce9cde2a7a33881ddcb2d68450803745804545cdd8d258f/setuptools-72.1.0-py3-none-any.whl
unearth.preparer: Downloading <Link https://files.pythonhosted.org/packages/e1/58/e0ef3b9974a04ce9cde2a7a33881ddcb2d68450803745804545cdd8d258f/setuptools-72.1.0-py3-none-any.whl (from https://pypi.org/simple/setuptools/)> (2.3 MB)
pdm.termui: Installing [email protected]...
pdm.termui: Using cached response for https://files.pythonhosted.org/packages/7d/cd/d7460c9a869b16c3dd4e1e403cce337df165368c71d6af229a74699622ce/wheel-0.43.0-py3-none-any.whl
unearth.preparer: Downloading <Link https://files.pythonhosted.org/packages/7d/cd/d7460c9a869b16c3dd4e1e403cce337df165368c71d6af229a74699622ce/wheel-0.43.0-py3-none-any.whl (from https://pypi.org/simple/wheel/)> (65 kB)
pdm.termui: Synchronization complete.
pdm.termui: error: Multiple top-level packages discovered in a flat-layout: ['m4', 'lib', 'utf8', 'ltdl', 'spot', 'bench', 'buddy', 'elisp', 'picosat'].
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: Failed to build package, try parsing project files.
Traceback (most recent call last):
  File "/usr/local/bin/pdm", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 346, in main
    return core.main(args or sys.argv[1:])
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 264, in main
    raise cast(Exception, err).with_traceback(traceback) from None
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 259, in main
    self.handle(project, options)
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 195, in handle
    command.handle(project, options)
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/commands/add.py", line 71, in handle
    self.do_add(
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/commands/add.py", line 159, in do_add
    resolved = do_lock(
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/actions.py", line 145, in do_lock
    mapping = _lock_for_env(
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/actions.py", line 189, in _lock_for_env
    mapping, *_ = resolve(
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/core.py", line 43, in resolve
    result = resolver.resolve(requirements, max_rounds)
  File "/usr/local/lib/python3.9/site-packages/resolvelib/resolvers.py", line 546, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/usr/local/lib/python3.9/site-packages/resolvelib/resolvers.py", line 426, in resolve
    name = min(unsatisfied_names, key=self._get_preference)
  File "/usr/local/lib/python3.9/site-packages/resolvelib/resolvers.py", line 203, in _get_preference
    return self._p.get_preference(
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/providers.py", line 117, in get_preference
    deps = self.get_dependencies(candidate)
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/providers.py", line 276, in get_dependencies
    deps, requires_python, _ = self.repository.get_dependencies(candidate)
  File "/usr/local/lib/python3.9/site-packages/pdm/models/repositories/base.py", line 101, in get_dependencies
    requirements, requires_python, summary = getter(candidate)
  File "/usr/local/lib/python3.9/site-packages/pdm/models/repositories/base.py", line 45, in wrapper
    self._candidate_info_cache.set(candidate, info)
  File "/usr/local/lib/python3.9/site-packages/pdm/models/caches.py", line 65, in set
    key = self._get_key(obj)
  File "/usr/local/lib/python3.9/site-packages/pdm/models/caches.py", line 89, in _get_key
    raise KeyError("The package is missing a name or version")
KeyError: 'The package is missing a name or version'

[jgraeb]

@frostming Could I please get some help with this? Am I doing something very obviously wrong? I tried linking it from GitLab using pdm add "spot @ git+https://gitlab.lre.epita.fr/spot/spot.git" -v but it again returns
'''
[RequirementError]: Invalid version for spot @
git+https://gitlab.lre.epita.fr/spot/spot.git: Invalid version: 'None'
'''

[frostming]

It isn't a python source distribution and can't be installed by any python package manager.

The installation guide doesn't tell how to install into python either. Please refer to the docs on how to build and install it.