Error installing the project in editable mode

[zaufi]

Issue description

I've got a project w/ setup.cfg and version meta-data taken from the package's attribute:

[metadata]
name = pipenv-bug-test
version = attr: bug.__version__

[options]
packages = bug
python_requires = >=3.6
zip_safe = True

[bdist_wheel]
universal = 1

My dev-packages section of the Pipfile has the entry:

pipenv-bug-test = {editable = true, path = "."}

Trying to install dev-dependencies fails for this setup.

Expected result

Successful install.

Actual result

Please note the "filename" reported in the last line:

Pipfile.lock not found, creating…
Locking [dev-packages] dependencies…
Building requirements...
Traceback (most recent call last):
  File "/usr/local/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/cli/command.py", line 232, in install
    retcode = do_install(
  File "/usr/local/lib/python3.8/dist-packages/pipenv/core.py", line 2051, in do_install
    do_init(
  File "/usr/local/lib/python3.8/dist-packages/pipenv/core.py", line 1299, in do_init
    do_lock(
  File "/usr/local/lib/python3.8/dist-packages/pipenv/core.py", line 1103, in do_lock
    venv_resolve_deps(
  File "/usr/local/lib/python3.8/dist-packages/pipenv/utils.py", line 1317, in venv_resolve_deps
    deps = convert_deps_to_pip(
  File "/usr/local/lib/python3.8/dist-packages/pipenv/utils.py", line 1434, in convert_deps_to_pip
    new_dep = Requirement.from_pipfile(dep_name, dep)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 2743, in from_pipfile
    r = FileRequirement.from_pipfile(name, pipfile)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 1842, in from_pipfile
    arg_dict["parsed_line"] = Line(line)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 178, in __init__
    self.parse()
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 1313, in parse
    self.parse_name()
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 1039, in parse_name
    name = self._parse_name_from_path()
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 1007, in _parse_name_from_path
    parsed_setup_cfg = self.parsed_setup_cfg
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/cached_property.py", line 35, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/requirements.py", line 892, in parsed_setup_cfg
    return parse_setup_cfg(setup_content, base_dir)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 322, in parse_setup_cfg
    name, version = get_name_and_version_from_setupcfg(parser, package_dir)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 277, in get_name_and_version_from_setupcfg
    version = parse_special_directives(parser.get("metadata", "version"), package_dir)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 191, in parse_special_directives
    rv = ast_parse_attribute_from_file(path, attribute)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1172, in ast_parse_attribute_from_file
    analyzer = ast_parse_file(path)
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/setup_info.py", line 1193, in ast_parse_file
    tree = ast.parse(read_source(path))
  File "/usr/local/lib/python3.8/dist-packages/pipenv/vendor/requirementslib/models/utils.py", line 1024, in read_source
    with open(path, "r", encoding=encoding) as fp:
FileNotFoundError: [Errno 2] No such file or directory: '/work/pipenv-bug-test/bug/bug'

My original case was a bit more complicated. I had a packages = find_namespace: in the options section of the setup.cfg and the reported not found "file" was:

/work/pipenv-bug-test/find_namespace:/bug

And yes, setting the version key to exact value (same as in bug/__init__.py) works fine.

Steps to replicate

1. unpack the attached sample project pipenv-bug-test.zip
2. try pipenv install --dev

---

$ pipenv --support

Pipenv version: '2020.6.2'

Pipenv location: '/usr/local/lib/python3.8/dist-packages/pipenv'

Python location: '/usr/bin/python3'

Python installations found:

• 3.8.2: /usr/bin/python3
• 3.8.2: /usr/bin/python3.8
• 3.8.2: /bin/python3
• 3.8.2: /bin/python3.8

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.8.2',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.16.18-gentoo-z3',
 'platform_system': 'Linux',
 'platform_version': '#5 SMP PREEMPT Sat Apr 6 19:26:28 +08 2019',
 'python_full_version': '3.8.2',
 'python_version': '3.8',
 'sys_platform': 'linux'}

System environment variables:

• PIPENV_VENV_IN_PROJECT
• COLORTERM
• HOSTNAME
• LANGUAGE
• PWD
• w
• HOME
• LANG
• LS_COLORS
• TERM
• PIP_DISABLE_PIP_VERSION_CHECK
• SHLVL
• LC_ALL
• PATH
• DEBIAN_FRONTEND
• OLDPWD
• _
• PYTHONDONTWRITEBYTECODE
• PIP_SHIMS_BASE_MODULE
• PIP_PYTHON_PATH
• PYTHONFINDER_IGNORE_UNSUPPORTED

Pipenv–specific environment variables:

• PIPENV_VENV_IN_PROJECT: 1

Debug–specific environment variables:

• PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
• LANG: en_US.UTF-8
• PWD: /work/pipenv-bug-test

---

Contents of Pipfile ('/work/pipenv-bug-test/Pipfile'):

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[dev-packages]
pipenv-bug-test = {editable = true, path = "."}

[packages]

[darrenmeehan]

This seems similar to this issue where I've commented some findings. #4326 (comment)