From 228c47959ff582a71c74126dc2444007663e3bd9 Mon Sep 17 00:00:00 2001
From: Danny Hermes <daniel.j.hermes@gmail.com>
Date: Sun, 26 Jan 2020 21:06:26 -0800
Subject: [PATCH] Avoiding `pip==20.0` and `pip==20.0.1`. (#192)

See some recent issues filed with these releases, e.g.
https://github.com/pypa/pip/issues/7629
---
 .appveyor.yml                 | 3 ++-
 .circleci/config.yml          | 1 +
 .travis.yml                   | 3 +++
 scripts/macos/travis-setup.sh | 2 +-
 4 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/.appveyor.yml b/.appveyor.yml
index b7209257..de74fc62 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -21,6 +21,7 @@ environment:
     MINGW_32: C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin
     MINGW_64: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin
     DEFAULT_PYTHON: "C:\\Python38-x64"
+    VIRTUALENV_NO_DOWNLOAD: "true"
 
   matrix:
 
@@ -61,7 +62,7 @@ install:
       $env:Path += ";$MINGW"
 
   # Packaging requirements
-  - python -m pip install --upgrade pip setuptools
+  - python -m pip install --upgrade "pip !=20.0,!=20.0.1" setuptools
   - python -m pip install --upgrade wheel
 
   # Install the build dependencies of the project.
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1b27d304..5eb20c18 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,6 +7,7 @@ jobs:
       - image: dhermes/bezier:latest
     environment:
       MATPLOTLIBRC: tests
+      VIRTUALENV_NO_DOWNLOAD: "true"
     steps:
       - checkout
       - setup_remote_docker
diff --git a/.travis.yml b/.travis.yml
index 1f6c1a60..0b6a80c5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,14 +18,17 @@ matrix:
       language: generic
       env:
         - PY_VERSION=3.6
+        - VIRTUALENV_NO_DOWNLOAD=true
     - os: osx
       language: generic
       env:
         - PY_VERSION=3.7
+        - VIRTUALENV_NO_DOWNLOAD=true
     - os: osx
       language: generic
       env:
         - PY_VERSION=3.8
+        - VIRTUALENV_NO_DOWNLOAD=true
 
 install:
   - source scripts/macos/travis-setup.sh
diff --git a/scripts/macos/travis-setup.sh b/scripts/macos/travis-setup.sh
index b2952937..0c22dd83 100755
--- a/scripts/macos/travis-setup.sh
+++ b/scripts/macos/travis-setup.sh
@@ -39,7 +39,7 @@ export PIP_CMD=${PIP_CMD/sudo/sudo -H}
 echo "PIP_CMD=${PIP_CMD}"
 
 # Make sure our installed CPython is set up for testing.
-${PIP_CMD} install --ignore-installed virtualenv pip
+${PIP_CMD} install --ignore-installed virtualenv "pip !=20.0,!=20.0.1"
 ${PIP_CMD} install --upgrade "nox >= 2019.11.9" numpy
 # Make sure there is a working ``cmake`` on the ``${PATH}``.
 ${PIP_CMD} install --upgrade "cmake >= 3.15.3"