[Gate fix] Fix pifpaf run postgresql failing.

This PS unblocks the gate by replacing pifpaf to run postgresql
for unit tests with docker, as a workaround. This is because
"pifpaf run postgresql" is failing with pifpaf not being able
to find the command "pifpaf run". Steps to reproduce:

python3 -m virtualenv -p python3 /tmp/venv
source /tmp/venv/bin/activate
pip install -U pip wheel devpi-client setuptools
pip install pifpaf

$pifpaf run postgresql
>> pifpaf: 'run' is not a pifpaf command. See 'pifpaf --help'.
>> Did you mean one of these?
     help

The unit test script for spinning up the docker postgresql container
and then running unit tests is very similar to the pre-existing
script for running functional tests located in tools/ directory.

Change-Id: Ib0f414ff58007037ac12161876dcd7a10e91f48c

deckhand/tests/unit/base.py

@@ -106,7 +106,7 @@ class DeckhandWithDBTestCase(DeckhandTestCase):
     def setUp(self):
         super(DeckhandWithDBTestCase, self).setUp()
         self.override_config(
-            'connection', os.environ.get('PIFPAF_URL', 'sqlite://'),
+            'connection', os.environ.get('DATABASE_URL', 'sqlite://'),
             group='database')
         db_api.setup_db()
         self.addCleanup(db_api.drop_db)

test-requirements.txt

@@ -15,7 +15,6 @@ testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT
 bandit>=1.1.0 # Apache-2.0
 gabbi==1.35.1
-pifpaf==0.10.0
 pytest-html==1.16.0
 
 # NOTE(fmontei): The requirement below is only included because readthedocs

tools/unit-tests.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+# Script for setting up temporary PostgreSQL database for testing unit tests
+# against.
+
+function cleanup {
+    sudo docker stop $POSTGRES_ID
+}
+
+trap cleanup EXIT
+
+
+POSTGRES_ID=$(
+    sudo docker run \
+        --detach \
+        --publish :5432 \
+        -e POSTGRES_DB=deckhand \
+        -e POSTGRES_USER=$(whoami) \
+        -e POSTGRES_PASSWORD=password \
+            postgres:9.5
+)
+
+POSTGRES_IP=$(
+    sudo docker inspect \
+        --format='{{ .NetworkSettings.Networks.bridge.IPAddress }}' \
+            $POSTGRES_ID
+)
+
+# Used by unit tests to interact with DB.
+export DATABASE_URL=postgresql+psycopg2://$(whoami):password@$POSTGRES_IP:5432/deckhand
+
+set -e
+posargs=$@
+if [ ${#posargs} -ge 1 ]; then
+    ostestr --concurrency 1 --regex ${posargs}
+else
+    ostestr --concurrency 1
+fi
+set +e

tox.ini

@@ -24,10 +24,9 @@ commands =
     ostestr '{posargs}'
 
 [testenv:py27-postgresql]
-#package required in ubuntu: libpq-dev
 commands =
     {[testenv]commands}
-    pifpaf run postgresql -- '{toxinidir}'/tools/pretty_tox.sh '--concurrency=1 {posargs}'
+    {toxinidir}/tools/unit-tests.sh '{posargs}'
 
 [testenv:py35]
 commands =
@@ -35,10 +34,9 @@ commands =
     ostestr '{posargs}'
 
 [testenv:py35-postgresql]
-#package required in ubuntu: libpq-dev
 commands =
     {[testenv]commands}
-    pifpaf run postgresql -- '{toxinidir}'/tools/pretty_tox.sh '--concurrency=1 {posargs}'
+    {toxinidir}/tools/unit-tests.sh '{posargs}'
 
 [testenv:functional]
 usedevelop = True