Load the pip version from the correct prefix

news/3506.feature.rst

@@ -0,0 +1 @@
+``pipenv install`` and ``pipenv sync`` will no longer attempt to install satisfied dependencies during installation.

news/4220.bugfix.rst

@@ -0,0 +1 @@
+Fixed a bug which caused pipenv to search non-existent virtual environments for ``pip`` when installing using ``--system``.

pipenv/core.py

@@ -1495,7 +1495,7 @@ def pip_install(
     pip_args = get_pip_args(
         pre=pre, verbose=environments.is_verbose(), upgrade=True,
         selective_upgrade=selective_upgrade, no_use_pep517=not use_pep517,
-        no_deps=no_deps, require_hashes=not ignore_hashes
+        no_deps=no_deps, require_hashes=not ignore_hashes,
     )
     pip_command.extend(pip_args)
     if r:

pipenv/patched/crayons.py

@@ -12,8 +12,8 @@
 import re
 import sys
 
-import shellingham
-import colorama
+from pipenv.vendor import shellingham
+from pipenv.vendor import colorama
 
 PY3 = sys.version_info[0] >= 3
 

pipenv/project.py

@@ -25,7 +25,7 @@
 from .environments import (
     PIPENV_DEFAULT_PYTHON_VERSION, PIPENV_IGNORE_VIRTUALENVS, PIPENV_MAX_DEPTH,
     PIPENV_PIPFILE, PIPENV_PYTHON, PIPENV_TEST_INDEX, PIPENV_VENV_IN_PROJECT,
-    is_in_virtualenv, is_type_checking
+    PIPENV_USE_SYSTEM, is_in_virtualenv, is_type_checking
 )
 from .vendor.requirementslib.models.utils import get_default_pyproject_backend
 from .utils import (
@@ -328,21 +328,30 @@ def pipfile_package_names(self):
             "combined": dev_keys | default_keys
         }
 
+    def get_environment(self, allow_global=False):
+        # type: (bool) -> Environment
+        if allow_global:
+            prefix = sys.prefix
+        else:
+            prefix = self.virtualenv_location
+        is_venv = is_in_virtualenv()
+        sources = self.sources if self.sources else [DEFAULT_SOURCE]
+        environment = Environment(
+            prefix=prefix, is_venv=is_venv, sources=sources, pipfile=self.parsed_pipfile,
+            project=self
+        )
+        pipenv_dist = get_pipenv_dist(pkg="pipenv")
+        if pipenv_dist:
+            environment.extend_dists(pipenv_dist)
+        else:
+            environment.add_dist("pipenv")
+        return environment
+
     @property
     def environment(self):
         if not self._environment:
-            prefix = self.virtualenv_location
-            is_venv = is_in_virtualenv()
-            sources = self.sources if self.sources else [DEFAULT_SOURCE]
-            self._environment = Environment(
-                prefix=prefix, is_venv=is_venv, sources=sources, pipfile=self.parsed_pipfile,
-                project=self
-            )
-            pipenv_dist = get_pipenv_dist(pkg="pipenv")
-            if pipenv_dist:
-                self._environment.extend_dists(pipenv_dist)
-            else:
-                self._environment.add_dist("pipenv")
+            allow_global = os.environ.get("PIPENV_USE_SYSTEM", PIPENV_USE_SYSTEM)
+            self._environment = self.get_environment(allow_global=allow_global)
         return self._environment
 
     def get_outdated_packages(self):

pipenv/vendor/vendor.txt

@@ -38,7 +38,7 @@ six==1.14.0
 semver==2.9.0
 toml==0.10.1
 cached-property==1.5.1
-vistir==0.5.1
+vistir==0.5.2
 pip-shims==0.5.2
     contextlib2==0.6.0.post1
     funcsigs==1.0.2

pipenv/vendor/vistir/misc.py

@@ -207,11 +207,14 @@ def __init__(
         stdout_allowed=False,  # type: bool
     ):
         # type: (...) -> None
+        stdout_encoding = None
+        stderr_encoding = None
+        preferred_encoding = getpreferredencoding()
         if subprocess is not None:
             stdout_encoding = self.get_subprocess_encoding(subprocess, "stdout")
             stderr_encoding = self.get_subprocess_encoding(subprocess, "stderr")
-        self.stdout_encoding = stdout_encoding or PREFERRED_ENCODING
-        self.stderr_encoding = stderr_encoding or PREFERRED_ENCODING
+        self.stdout_encoding = stdout_encoding or preferred_encoding
+        self.stderr_encoding = stderr_encoding or preferred_encoding
         self.stdout_lines = []
         self.text_stdout_lines = []
         self.stderr_lines = []

tasks/vendoring/patches/patched/crayons.patch

@@ -8,8 +8,9 @@ index 455d3e90..de735daf 100644
 
 -PY3 = sys.version_info[0] >= 3
 -
-+import shellingham
- import colorama
+-import colorama
++from pipenv.vendor import shellingham
++from pipenv.vendor import colorama
 
 +PY3 = sys.version_info[0] >= 3
 +