plpython2 is dead, long live plpython

.travis.yml

@@ -17,23 +17,26 @@ env:
     - POSTGRESQL_VERSION="12"
 
 
-before_install:
+script:
   - sudo service postgresql stop;
   - sudo apt-get remove postgresql* -y
   - sudo apt-get install -y --allow-unauthenticated --no-install-recommends --no-install-suggests postgresql-$POSTGRESQL_VERSION postgresql-client-$POSTGRESQL_VERSION postgresql-server-dev-$POSTGRESQL_VERSION postgresql-common
   - if [[ $POSTGRESQL_VERSION == '9.6' ]]; then sudo apt-get install -y postgresql-contrib-9.6; fi;
-  - sudo apt-get install -y --allow-unauthenticated postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION-scripts postgis postgresql-plpython-$POSTGRESQL_VERSION
+  - sudo apt-get install -y --allow-unauthenticated postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION-scripts postgis
+  # For pre12, install plpython2. For PG12 install plpython3 and make it default
+  - if [[ $POSTGRESQL_VERSION != '12' ]]; then sudo apt-get install -y postgresql-plpython-$POSTGRESQL_VERSION; else sudo apt-get install -y postgresql-plpython3-12 && sudo cp /usr/share/postgresql/12/extension/plpython3u.control /usr/share/postgresql/12/extension/plpythonu.control && sudo cp /usr/share/postgresql/12/extension/plpython3u--1.0.sql /usr/share/postgresql/12/extension/plpythonu--1.0.sql && sudo cp /usr/share/postgresql/12/extension/plpython3u--unpackaged--1.0.sql /usr/share/postgresql/12/extension/plpythonu--unpackaged--1.0.sql; fi;
   - sudo pg_dropcluster --stop $POSTGRESQL_VERSION main
   - sudo rm -rf /etc/postgresql/$POSTGRESQL_VERSION /var/lib/postgresql/$POSTGRESQL_VERSION
   - sudo pg_createcluster -u postgres $POSTGRESQL_VERSION main -- --auth-local trust --auth-host password
   - sudo /etc/init.d/postgresql start $POSTGRESQL_VERSION || sudo journalctl -xe
   - sudo pip install redis==2.4.9
-script:
+
   - make
   - sudo make install
   - make installcheck
 
 after_failure:
+  - dpkg-query -L postgresql-plpython3-$POSTGRESQL_VERSION
   - pg_lsclusters
   - cat regression.out
   - cat regression.diffs