postgres: add upgrade postgres script

roles/postgres/files/upgrade_pg.sh

+#!/bin/bash
+set -e
+
+## Set the old version that we want to upgrade from.
+TO_VERSION=$(pacman -Q postgresql | grep -Po '(?<=postgresql )[0-9]+\.[0-9]')
+to_major=$(echo "$TO_VERSION" | awk -F'.' '{print $1}')
+to_minor=$(echo "$TO_VERSION" | awk -F'.' '{print $2}')
+if [[ ${to_major} -ne 11 ]]; then
+	echo "WARNING: major upgrade detected, aborting..."
+	exit 1
+fi
+export FROM_VERSION="$(cat /var/lib/postgres/data/PG_VERSION)"
+
+# free space check
+used_space=$(df --local --output=pcent /var/lib/postgres/ | grep -Po '[0-9]{1,3}(?=%)')
+if [[ ${used_space} -ge 50 ]]; then
+	echo "ERROR: not enough free space for upgrade with backup, aborting..."
+	exit 2
+fi
+
+pacman -S --needed postgresql-old-upgrade
+chown postgres:postgres /var/lib/postgres/
+if [[ -d "/var/lib/postgres/data-${FROM_VERSION}" ]]; then
+	echo "ERROR: backup data-${FROM_VERSION} directory already exists, aborting..."
+	exit 3
+fi
+su - postgres -c "mv /var/lib/postgres/data /var/lib/postgres/data-${FROM_VERSION}"
+su - postgres -c 'mkdir /var/lib/postgres/data'
+su - postgres -c "initdb --locale $LANG -E UTF8 -D /var/lib/postgres/data"
+vimdiff "/var/lib/postgres/data/pg_hba.conf" "/var/lib/postgres/data-${FROM_VERSION}/pg_hba.conf"
+vimdiff "/var/lib/postgres/data/postgresql.conf" "/var/lib/postgres/data-${FROM_VERSION}/postgresql.conf"
+#cp -avx "/var/lib/postgres/data-${FROM_VERSION}/server.crt" "/var/lib/postgres/data/server.crt"
+#cp -avx "/var/lib/postgres/data-${FROM_VERSION}/server.key" "/var/lib/postgres/data/server.key"
+systemctl stop postgresql.service
+su - postgres -c "pg_upgrade -b /opt/pgsql-${FROM_VERSION}/bin/ -B /usr/bin/ -d /var/lib/postgres/data-${FROM_VERSION} -D /var/lib/postgres/data"
+systemctl daemon-reload
+systemctl start postgresql.service
+su - postgres -c '/var/lib/postgres/analyze_new_cluster.sh'
+su - postgres -c '/var/lib/postgres/delete_old_cluster.sh'

roles/postgres/tasks/main.yml

@@ -65,3 +65,6 @@
   when: configure_firewall
   tags:
     - firewall
+
+- name: copy postgresql upgrade script
+  copy: src=upgrade_pg.sh dest=/usr/local/bin/upgrade_pg.sh mode=0755 owner=root group=root