Encapsulate build logic with bash and a Makefile.

Makefile

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+all: env test
+
+clean:
+	bin/clean.sh
+
+env:
+	bin/env.sh
+
+test:
+	bin/test.sh

bin/clean.sh

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+#!/bin/bash -e
+
+set -o errexit -o nounset -o pipefail
+
+BASEDIR=`dirname $0`/..
+
+rm -rf $BASEDIR/.tox $BASEDIR/env
+echo "Deleted virtualenv and test artifacts."
+

bin/env.sh

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+#!/bin/bash -e
+
+BASEDIR=`dirname $0`/..
+
+if [ ! -d "$BASEDIR/env" ]; then
+    virtualenv -q $BASEDIR/env --prompt='(dcos-cli) '
+    echo "Virtualenv created."
+fi
+
+cd $BASEDIR
+source $BASEDIR/env/bin/activate
+echo "Virtualenv activated."
+
+if [ ! -f "$BASEDIR/env/updated" -o $BASEDIR/setup.py -nt $BASEDIR/env/updated ]; then
+    pip install -e $BASEDIR
+    touch $BASEDIR/env/updated
+    echo "Requirements installed."
+fi
+
+pip install tox
+echo "Tox installed."
+

bin/test.sh

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+#!/bin/bash -e
+
+BASEDIR=`dirname $0`/..
+
+cd $BASEDIR
+source $BASEDIR/env/bin/activate
+echo "Virtualenv activated."
+
+tox