From 6389bde0bc966e5a5850735b0b1605f7fca233f9 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Sat, 9 Sep 2017 21:26:40 +0200
Subject: ci/travis: skip pip3 upgrade if pip3 is missing

Workaround for travis issue:
https://github.com/travis-ci/travis-ci/issues/8363

Sometimes `pip3` works, sometimes not:
   pyenv: pip3: command not found
   The `pip3' command exists in these Python versions:
     3.5
     3.5.3

Tried these steps to fix the issue:
- add `python: 3.6` to top level of `.travis.yml`
- add `python3` to `addons.apt.packages` level of `.travis.yml`
- `pyenv global system 3.{4,5,6}`
- `pyenv global 3.6`
In all cases the presence or absence of `pip3` was random.
---
 ci/before_install.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ci/before_install.sh b/ci/before_install.sh
index 7279152fb0..8b0603eb16 100755
--- a/ci/before_install.sh
+++ b/ci/before_install.sh
@@ -32,6 +32,10 @@ if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
   echo "Upgrade Python 3 pip."
   pip3 -q install --user --upgrade pip
 else
-  echo "Upgrade Python 3 pip."
-  pip3 -q install --user --upgrade pip
+  if command -v pip3 ; then
+    echo "Upgrade Python 3 pip."
+    pip3 -q install --user --upgrade pip
+  else
+    echo 'warning: missing pip3'
+  fi
 fi
-- 
cgit