pipenv sync fails without Pipfile present

Issue description

Running pipenv sync without a Pipfile present (the Pipfile.lock is there) fails with the message

Error: Pipfile.lock is missing! You need to run $ pipenv lock first.

Expected result

I would expect the Pipfile not to be needed at all for sync since it should just install the pinned versions from the Pipfile.lock

Actual result

pipenv won’t install anything because it either thinks it needs a Pipfile as well as a Pipfile.lock for some reason. It also complains about the wrong file (Pipenv.lock).

Steps to replicate

• Create a new virtualenv, e.g with pipenv install requests
• Remove the Pipfile (keeping only the Pipfile.lock)
• Run pipenv sync

---

$ pipenv --support

Pipenv version: '2018.7.1'

Pipenv location: '/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv'

Python location: '/usr/local/Cellar/pipenv/2018.7.1/libexec/bin/python3.7'

Other Python installations in PATH:

• 2.7: /usr/local/bin/python2.7

• 2.7: /usr/local/bin/python2.7

• 2.7: /usr/bin/python2.7

• 2.7: /usr/local/bin/python2.7

• 2.7: /usr/bin/python2.7

• 3.7: /usr/local/bin/python3.7m

• 3.7: /usr/local/bin/python3.7

• 3.7: /usr/local/bin/python3.7

• 2.7.15: /usr/local/bin/python

• 2.7.10: /usr/bin/python

• 2.7.15: /usr/local/bin/python

• 2.7.10: /usr/bin/python

• 2.7.15: /usr/local/bin/python2

• 2.7.15: /usr/local/bin/python2

• 3.7.0: /usr/local/bin/python3

• 3.7.0: /usr/local/bin/python3

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.7.0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '17.5.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 17.5.0: Fri Apr 13 19:32:32 PDT '
                     '2018; root:xnu-4570.51.2~1/RELEASE_X86_64',
 'python_full_version': '3.7.0',
 'python_version': '3.7',
 'sys_platform': 'darwin'}

System environment variables:

• PATH
• TERM_PROGRAM
• SHELL
• TERM
• TMPDIR
• PIPENV_VENV_IN_PROJECT
• Apple_PubSub_Socket_Render
• TERM_PROGRAM_VERSION
• TERM_SESSION_ID
• LC_ALL
• USER
• SSH_AUTH_SOCK
• __CF_USER_TEXT_ENCODING
• LSCOLORS
• _
• PWD
• LANG
• ITERM_PROFILE
• XPC_FLAGS
• XPC_SERVICE_NAME
• COLORFGBG
• HOME
• SHLVL
• ITERM_SESSION_ID
• LOGNAME
• LC_CTYPE
• GOPATH
• DISPLAY
• COLORTERM
• PYTHONDONTWRITEBYTECODE
• PIP_PYTHON_PATH

Pipenv–specific environment variables:

• PIPENV_VENV_IN_PROJECT: 1

Debug–specific environment variables:

• PATH: /usr/local/Cellar/pipenv/2018.7.1/libexec/tools:/Users/ulrjoh2/.composer/vendor/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/MacGPG2/bin:/opt/X11/bin:/Applications/Wireshark.app/Contents/MacOS:/usr/local/opt/go/libexec/bin:/Users/ulrjoh2/work/bin:/Users/ulrjoh2/.local/bin:/Users/ulrjoh2/.composer/vendor/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/MacGPG2/bin:/opt/X11/bin:/Applications/Wireshark.app/Contents/MacOS:/usr/local/opt/go/libexec/bin:/Users/ulrjoh2/work/bin
• SHELL: /bin/bash
• LANG: en_US.UTF-8
• PWD: /tmp/test

---

[uranusjr]

This is open.

[frostming]

Sure thing, thank you for following up