Installing versions of Postgres other than the default version in TravisCI.

install-postgres-travisci

#!/bin/sh

TRAVIS_PGVERSION='9.1'

if [ $PGVERSION != $TRAVIS_PGVERSION ]
then
  sudo -u postgres pg_dropcluster --stop $TRAVIS_PGVERSION main
  export PGCLUSTER=$PGVERSION/main
fi

sudo add-apt-repository -yy ppa:pitti/postgresql
sudo apt-get update -qq
sudo sed -i -e 's/ident/trust/g' /etc/postgresql/$PGVERSION/main/pg_hba.conf
sudo service postgresql reload