Pipenv unable to install relative path that is a subdirectory of a Pipfile

Issue description

Pipenv will fail to install a relative path that is a subdirectory of a directory with a Pipfile.

Expected result

Installation to succeed.

Actual result

A resolution error is returned.

$ pipenv install .
Installing ....
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 98, in __init__
    req = REQUIREMENT.parseString(requirement_string)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 1654, in parseString
    raise exc
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 1644, in parseString
    loc, tokens = self._parse( instring, 0 )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 1402, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 3417, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 1402, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 3739, in parseImpl
    return self.expr._parse( instring, loc, doActions, callPreParse=False )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 1402, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 3400, in parseImpl
    loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 1406, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/pyparsing.py", line 2711, in parseImpl
    raise ParseException(instring, loc, self.errmsg, self)
pkg_resources._vendor.pyparsing.ParseException: Expected W:(abcd...) (at char 0), (line:1, col:1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 966, in _parse_name_from_line
    self._requirement = init_requirement(self.line)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/utils.py", line 200, in init_requirement
    req = Requirement.parse(name)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3139, in parse
    req, = parse_requirements(s)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3084, in parse_requirements
    yield Requirement(line)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3094, in __init__
    super(Requirement, self).__init__(requirement_string)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 100, in __init__
    raise InvalidRequirement(
pkg_resources.extern.packaging.requirements.InvalidRequirement: Parse error at "'.'": Expected W:(abcd...)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/pipenv", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.8/site-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/site-packages/pipenv/vendor/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/click/decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/pipenv/cli/command.py", line 233, in install
    retcode = do_install(
  File "/usr/local/lib/python3.8/site-packages/pipenv/core.py", line 2100, in do_install
    pkg_requirement = Requirement.from_line(pkg_line)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 2676, in from_line
    parsed_line = Line(line)
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 171, in __init__
    self.parse()
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 1304, in parse
    self.parse_name()
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 1027, in parse_name
    name = self._parse_name_from_line()
  File "/usr/local/lib/python3.8/site-packages/pipenv/vendor/requirementslib/models/requirements.py", line 968, in _parse_name_from_line
    raise RequirementError(
pipenv.vendor.requirementslib.exceptions.RequirementError: Failed parsing requirement from '.'

Steps to replicate

1. Make an empty directory
2. Cd to empty directory
3. Run pipenv install
4. Clone a python package into the directory. Example can include git clone https://github.com/sphinx-doc/sphinx.git
5. Cd to subdirectory
6. Run pipenv install . or pipenv install -e .

---

$ pipenv --support

Pipenv version: '2021.5.29'

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

Python location: '/usr/local/opt/python@3.8/bin/python3.8'

Python installations found:

• 3.9.9: /usr/local/bin/python3
• 3.9.9: /usr/local/bin/python3.9
• 3.8.2: /usr/bin/python3
• 2.7.16: /usr/bin/python2
• 2.7.16: /usr/bin/python2.7

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.8.12',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '20.5.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 20.5.0: Sat May  8 05:10:33 PDT '
                     '2021; root:xnu-7195.121.3~9/RELEASE_X86_64',
 'python_full_version': '3.8.12',
 'python_version': '3.8',
 'sys_platform': 'darwin'}

System environment variables:

• TERM_SESSION_ID
• SSH_AUTH_SOCK
• LC_TERMINAL_VERSION
• COLORFGBG
• ITERM_PROFILE
• XPC_FLAGS
• LANG
• PWD
• SHELL
• __CFBundleIdentifier
• TERM_PROGRAM_VERSION
• TERM_PROGRAM
• PATH
• DISPLAY
• LC_TERMINAL
• COLORTERM
• COMMAND_MODE
• TERM
• HOME
• TMPDIR
• USER
• XPC_SERVICE_NAME
• LOGNAME
• ITERM_SESSION_ID
• __CF_USER_TEXT_ENCODING
• SHLVL
• OLDPWD
• P9K_TTY
• VIRTUAL_ENV_DISABLE_PROMPT
• PIPENV_VERBOSITY
• LDFLAGS
• CPPFLAGS
• EDITOR
• ZSH
• PAGER
• LESS
• LSCOLORS
• P9K_SSH
• MANPATH
• _
• PIP_DISABLE_PIP_VERSION_CHECK
• PYTHONDONTWRITEBYTECODE
• PIP_SHIMS_BASE_MODULE
• PIP_PYTHON_PATH
• PYTHONFINDER_IGNORE_UNSUPPORTED

Pipenv–specific environment variables:

• PIPENV_VERBOSITY: -1

Debug–specific environment variables:

• PATH: /usr/local/opt/ruby/bin:/usr/local/sbin:Users/aoyansarkar/.cargo/bin:/usr/local/lib/ruby/gems/3.0.0/bin:/Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home/bin:/Library/Frameworks/Python.framework/Versions/3.8/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/MacGPG2/bin:/Applications/Little Snitch.app/Contents/Components:/opt/X11/bin:/Library/Apple/usr/bin:/Users/aoyansarkar/.oh-my-zsh/custom/plugins/git-extra-commands/bin:/usr/local/opt/fzf/bin
• SHELL: /bin/zsh
• EDITOR: vim
• LANG: en_US.UTF-8
• PWD: /Volumes/RAMDisk/praw

---

Contents of Pipfile (‘/Volumes/RAMDisk/Pipfile’):

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

[packages]

[dev-packages]

[requires]
python_version = "3.9"

Contents of Pipfile.lock (‘/Volumes/RAMDisk/Pipfile.lock’):

{
    "_meta": {
        "hash": {
            "sha256": "a36a5392bb1e8bbc06bfaa0761e52593cf2d83b486696bf54667ba8da616c839"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.9"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {},
    "develop": {}
}

[frostming]

@matteius Yes, the root directory doesn’t contain a setup.py and is thus not recognized as a valid local requirement. The requirement parsing is performed after changing root to the project root so it fails.

[matteius]

Let’s track this issue in: #5490