#!/bin/bash -e

# Even though Travis CI supports Mac OS X [1] and several Python interpreters

# are installed out of the box, the Python environment cannot be configured in

# the Travis CI build configuration [2].

#

# As a workaround the build configuration file specifies a single Mac OS X job

# with `language: generic' that runs this script to create and activate a

# Python virtual environment.

#

# Recently the `virtualenv' command seems to no longer come pre-installed on

# the MacOS workers of Travis CI [3] so when this situation is detected we

# install it ourselves.

#

# [1] https://github.com/travis-ci/travis-ci/issues/216

# [2] https://github.com/travis-ci/travis-ci/issues/2312

# [3] https://travis-ci.org/xolox/python-humanfriendly/jobs/411396506

main () {

if [ "$TRAVIS_OS_NAME" = osx ]; then

local environment="$HOME/virtualenv/python2.7"

if [ -x "$environment/bin/python" ]; then

msg "Activating virtual environment ($environment) .."

source "$environment/bin/activate"

else

if ! which virtualenv &>/dev/null; then

msg "Installing 'virtualenv' in per-user site-packages .."

pip install --user virtualenv

msg "Figuring out 'bin' directory of per-user site-packages .."

LOCAL_BINARIES=$(python -c 'import os, site; print(os.path.join(site.USER_BASE, "bin"))')

msg "Prefixing '$LOCAL_BINARIES' to PATH .."

export PATH="$LOCAL_BINARIES:$PATH"

fi

msg "Creating virtual environment ($environment) .."

virtualenv "$environment"

msg "Activating virtual environment ($environment) .."

source "$environment/bin/activate"

msg "Checking if 'pip' executable works .."

if ! pip --version; then

msg "Bootstrapping working 'pip' installation using get-pip.py .."

curl -s https://bootstrap.pypa.io/get-pip.py | python -

fi

fi

fi

msg "Running command: $*"

eval "$@"

}

msg () {

echo "[travis.sh] $*" >&2

}

main "$@"