also pass PIP_INDEX_URL because it's likely that the user wants to use2.0.0

it with the pip commands that run inside the tox run.

5 files changed, 9 insertions, 8 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 1c14310..c0b7d59 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,10 +2,10 @@
 -----------
 
 - (new) introduce environment variable isolation:
-  tox now only passes the PATH variable from the tox
+  tox now only passes the PATH and PIP_INDEX_URL variable from the tox
   invocation environment to the test environment and on Windows 
   also ``SYSTEMROOT``, ``PATHEXT``, ``TEMP`` and ``TMP`` whereas
-  on linux additionally ``TMPDIR`` is passed.  If you need to pass 
+  on unix additionally ``TMPDIR`` is passed.  If you need to pass 
   through further environment variables you can use the new ``passenv`` setting,
   a space-separated list of environment variable names.  Each name
   can make use of fnmatch-style glob patterns.  All environment
diff --git a/doc/announce/release-2.0.txt b/doc/announce/release-2.0.txt
index d21a12b..d2caf0c 100644
--- a/doc/announce/release-2.0.txt
+++ b/doc/announce/release-2.0.txt
@@ -55,10 +55,10 @@ Holger Krekel, merlinux GmbH
 -----------
 
 - (new) introduce environment variable isolation:
-  tox now only passes the PATH variable from the tox
+  tox now only passes the PATH and PIP_INDEX_URL variable from the tox
   invocation environment to the test environment and on Windows
   also ``SYSTEMROOT``, ``PATHEXT``, ``TEMP`` and ``TMP`` whereas
-  on linux additionally ``TMPDIR`` is passed.  If you need to pass
+  on unix additionally ``TMPDIR`` is passed.  If you need to pass
   through further environment variables you can use the new ``passenv`` setting,
   a space-separated list of environment variable names.  Each name
   can make use of fnmatch-style glob patterns.  All environment
@@ -109,4 +109,3 @@ Holger Krekel, merlinux GmbH
   experimental plugin hooks, use tox internals at your own risk.
 
 - DEPRECATE distshare in documentation
-
diff --git a/doc/config.txt b/doc/config.txt
index 816c7bf..5a335f9 100644
--- a/doc/config.txt
+++ b/doc/config.txt
@@ -199,8 +199,9 @@ Complete list of settings that you can put into ``testenv*`` sections:
    invocation environment it is ignored.  You can use ``*`` and ``?`` to
    match multiple environment variables with one name.
 
-   Note that the ``PATH`` variable is unconditionally passed down and on
-   Windows ``SYSTEMROOT`` and ``PATHEXT`` will be passed down as well.
+   Note that the ``PATH`` and ``PIP_INDEX_URL`` variables are unconditionally
+   passed down and on Windows ``SYSTEMROOT``, ``PATHEXT``, ``TEMP`` and ``TMP``
+   will be passed down as well whereas on unix ``TMPDIR`` will be passed down.
    You can override these variables with the ``setenv`` option.
 
 .. confval:: recreate=True|False(default)
diff --git a/tests/test_config.py b/tests/test_config.py
index a3824a6..526a795 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -715,6 +715,7 @@ class TestConfigTestEnv:
         else:
             assert "TMPDIR" in envconfig.passenv
         assert "PATH" in envconfig.passenv
+        assert "PIP_INDEX_URL" in envconfig.passenv
         assert "A123A" in envconfig.passenv
         assert "A123B" in envconfig.passenv
 
diff --git a/tox/config.py b/tox/config.py
index de45138..5963f13 100644
--- a/tox/config.py
+++ b/tox/config.py
@@ -387,7 +387,7 @@ def tox_addoption(parser):
         help="list of X=Y lines with environment variable settings")
 
     def passenv(testenv_config, value):
-        passenv = set(["PATH"])
+        passenv = set(["PATH", "PIP_INDEX_URL"])
 
         # we ensure that tmp directory settings are passed on
         # we could also set it to the per-venv "envtmpdir"