From 26a4b3eac05b50a2d27f9968f80a31454df925a2 Mon Sep 17 00:00:00 2001
From: Brian Haley <bhaley@redhat.com>
Date: Thu, 12 Jul 2018 16:34:18 -0400
Subject: [PATCH] tox: Reuse envdirs

This massively reduces the amount of time needed to install
dependencies and saves a lot of disk space to boot.

Modeled on Nova change, https://review.openstack.org/#/c/534382/

Change-Id: Icae3b6b2b0d014aec17b04b3b516b13b2fa47c5d
---
 tox.ini | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tox.ini b/tox.ini
index c442c2229e1..0c750fdf6bf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,6 +24,7 @@ commands = stestr run {posargs}
 
 [testenv:debug]
 basepython = python3
+envdir = {toxworkdir}/shared
 commands = oslo_debug_helper -t neutron/tests {posargs}
 
 [testenv:common]
@@ -94,11 +95,13 @@ commands =
 
 [testenv:releasenotes]
 basepython = python3
+envdir = {toxworkdir}/docs
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:pep8]
 basepython = python3
+envdir = {toxworkdir}/shared
 deps =
   {[testenv]deps}
 commands=
@@ -119,6 +122,7 @@ whitelist_externals =
 
 [testenv:cover]
 basepython = python3
+envdir = {toxworkdir}/shared
 setenv =
   {[testenv]setenv}
   PYTHON=coverage run --source neutron --parallel-mode
@@ -135,11 +139,13 @@ commands = {posargs}
 
 [testenv:docs]
 basepython = python3
+envdir = {toxworkdir}/docs
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:linkcheck]
 basepython = python3
+envdir = {toxworkdir}/docs
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b linkcheck doc/source doc/build/linkcheck
 
@@ -169,6 +175,7 @@ local-check-factory = neutron.hacking.checks.factory
 
 [testenv:bandit]
 basepython = python3
+envdir = {toxworkdir}/shared
 # B104: Possible binding to all interfaces
 # B303: blacklist calls: md5, sha1
 # B311: Standard pseudo-random generators are not suitable for security/cryptographic purpose
@@ -178,6 +185,7 @@ commands = bandit -r neutron -x tests -n5 -s B104,B303,B311,B604
 
 [testenv:bashate]
 basepython = python3
+envdir = {toxworkdir}/shared
 commands = bash -c "find {toxinidir}             \
          -not \( -type d -name .tox\* -prune \)  \
          -not \( -type d -name .venv\* -prune \) \
@@ -191,6 +199,7 @@ commands = bash -c "find {toxinidir}             \
 
 [testenv:genconfig]
 basepython = python3
+envdir = {toxworkdir}/shared
 commands = {toxinidir}/tools/generate_config_file_samples.sh
 
 # This environment can be used to quickly validate that all needed system