Postgres cluster upgrade for new Postgres version on Arch linux

pg-upgrade.sh

# If postgis is used
yay -S postgis-old-upgrade
sudo su
systemctl stop postgresql
mv /var/lib/postgres/data /var/lib/postgres/olddata
mkdir /var/lib/postgres/data /var/lib/postgres/tmp
chown postgres:postgres /var/lib/postgres/data /var/lib/postgres/tmp
sudo su postgres
cd /var/lib/postgres/tmp
# Use --no-data-checksums if pg was initialized without page checksums
initdb -D /var/lib/postgres/data --locale=C.UTF-8 --encoding=UTF8 --no-data-checksums
# Replace 18 with old pg version number
pg_upgrade -b /opt/pgsql-18/bin -B /usr/bin -d /var/lib/postgres/olddata -D /var/lib/postgres/data
systemctl start postgresql
psql -f update_extensions.sql
./delete_old_cluster.sh