ensuring postgres version

.travis.yml

@@ -7,15 +7,13 @@ jobs:
       language: generic
       before_install: docker pull cartoimages/engine-xenial-pg101
       script: docker run -e POSTGIS_VERSION=2.4 -v `pwd`:/srv cartoimages/engine-xenial-pg101 bash run_tests_docker.sh
-    - dist: trusty
+    - dist: precise
       addons:
         postgresql: "9.5"
         apt:
           sources:
             - ubuntu-toolchain-r-test
           packages:
-            - postgresql-9.5-postgis-2.3
-            - postgresql-plpython-9.5
             - pkg-config
             - libcairo2-dev
             - libjpeg8-dev
@@ -24,9 +22,45 @@ jobs:
             - g++-4.9
 
       before_install:
+        # Add custom PPAs from cartodb
+        - sudo add-apt-repository -y ppa:cartodb/postgresql-9.5
+        - sudo add-apt-repository -y ppa:cartodb/gis
+        - sudo add-apt-repository -y ppa:cartodb/gis-testing
+
+        - sudo apt-get update
+      
+        # Force instalation of libgeos-3.5.0 (presumably needed because of existing version of postgis)
+        - sudo apt-get -y install libgeos-3.5.0=3.5.0-1cdb2
+
+        # Install postgres db and build deps
+        - sudo /etc/init.d/postgresql stop # stop travis default instance
+        - sudo apt-get -y remove --purge postgresql-9.1
+        - sudo apt-get -y remove --purge postgresql-9.2
+        - sudo apt-get -y remove --purge postgresql-9.3
+        - sudo apt-get -y remove --purge postgresql-9.4
+        - sudo apt-get -y remove --purge postgresql-9.5
+        - sudo apt-get -y remove --purge postgresql-9.6
+        - sudo rm -rf /var/lib/postgresql/
+        - sudo rm -rf /var/log/postgresql/
+        - sudo rm -rf /etc/postgresql/
+        - sudo apt-get -y remove --purge postgis-2.2
+        - sudo apt-get -y autoremove
+        - sudo apt-get -y install postgresql-9.5=9.5.2-3cdb3
+        - sudo apt-get -y install postgresql-server-dev-9.5=9.5.2-3cdb3
+        - sudo apt-get -y install postgresql-plpython-9.5=9.5.2-3cdb3
+        - sudo apt-get -y install postgresql-9.5-postgis-scripts=2.2.2.0-cdb2
+        - sudo apt-get -y install postgresql-9.5-postgis-2.2=2.2.2.0-cdb2
+
+        # configure it to accept local connections from postgres
+        - echo -e "# TYPE  DATABASE        USER            ADDRESS                 METHOD \nlocal   all             postgres                                trust\nlocal   all             all                                     trust\nhost    all             all             127.0.0.1/32            trust" \
+          | sudo tee /etc/postgresql/9.5/main/pg_hba.conf
+        - sudo /etc/init.d/postgresql restart 9.5
+        
         - createdb template_postgis
         - createuser publicuser
         - psql -c "CREATE EXTENSION postgis" template_postgis
+        
+        # install yarn 0.27.5
         - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 0.27.5	
         - export PATH="$HOME/.yarn/bin:$PATH"