From 94b20eb3f5cc23c0df70a9d85b2d9313d0373002 Mon Sep 17 00:00:00 2001
From: Kenneth Reitz <me@kennethreitz.org>
Date: Tue, 13 Feb 2018 12:16:15 -0500
Subject: [PATCH] add --system support to pipenv check

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>
---
 pipenv/cli.py  |  5 +++--
 pipenv/core.py | 14 ++++++++++----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/pipenv/cli.py b/pipenv/cli.py
index 94477626..ec055e41 100644
--- a/pipenv/cli.py
+++ b/pipenv/cli.py
@@ -314,12 +314,13 @@ def run(command, args, three=None, python=False):
 ))
 @click.option('--three/--two', is_flag=True, default=None, help="Use Python 3/2 when creating virtualenv.")
 @click.option('--python', default=False, nargs=1, help="Specify which version of Python virtualenv should use.")
+@click.option('--system', is_flag=True, default=False, help="Use system Python.")
 @click.option('--unused', nargs=1, default=False, help="Given a code path, show potentially unused dependencies.")
 @click.option('--style', nargs=1, default=False, help="Given a code path, show Flake8 errors.")
 @click.argument('args', nargs=-1)
-def check(three=None, python=False, unused=False, style=False, args=None):
+def check(three=None, python=False, system=False, unused=False, style=False, args=None):
     from . import core
-    core.do_check(three=three, python=python, unused=unused, style=style, args=args)
+    core.do_check(three=three, python=python, system=system, unused=unused, style=style, args=args)
 
 
 @click.command(short_help=u"Displays currently–installed dependency graph information.")
diff --git a/pipenv/core.py b/pipenv/core.py
index fa9bf1a1..2dccee92 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -2027,10 +2027,11 @@ def do_run(command, args, three=None, python=False):
         pass
 
 
-def do_check(three=None, python=False, unused=False, style=False, args=None):
+def do_check(three=None, python=False, system=False, unused=False, style=False, args=None):
 
-    # Ensure that virtualenv is available.
-    ensure_project(three=three, python=python, validate=False, warn=False)
+    if not system:
+        # Ensure that virtualenv is available.
+        ensure_project(three=three, python=python, validate=False, warn=False)
 
     if not args:
         args = []
@@ -2099,7 +2100,12 @@ def do_check(three=None, python=False, unused=False, style=False, args=None):
     path = pep508checker.__file__.rstrip('cdo')
     path = os.sep.join(__file__.split(os.sep)[:-1] + ['patched', 'safety.zip'])
 
-    c = delegator.run('"{0}" {1} check --json'.format(which('python'), shellquote(path)))
+    if not system:
+        python = which('python')
+    else:
+        python = system_which('python')
+
+    c = delegator.run('"{0}" {1} check --json'.format(python, shellquote(path)))
     try:
         results = simplejson.loads(c.out)
     except ValueError: