Hi,
when upgrading postgresql 12 -> 13 the pg_upgrade --check doesn't sufficiently check for pg_pltemplate modifications (at least in version 13.5-1.pgdg110+1).
Here's a simple bash script that checks for pg_pltemplate modifications on each database:
for db in $(psql -tc "SELECT datname FROM pg_database;")
do
if [[ "${db}" != "template0" ]]; then
dump=$(pg_dump --schema-only --quote-all-identifiers ${db} | grep pg_pltemplate)
if [ ! -z "$dump" ]; then
echo "ERROR: ${db} contains pg_pltemplate modifications. pg_upgrade will fail"
exit 1
fi
fi
done
echo "OK"
Any non-default GRANT/REVOKE like these:
REVOKE SELECT ON TABLE "pg_catalog"."pg_pltemplate" FROM PUBLIC;
GRANT SELECT ON TABLE "pg_catalog"."pg_pltemplate" TO "reader";
would break the upgrade process, even though the pg_upgrade --check says:
*Clusters are compatible*
then upgrade (at least with --link) fails
pg_restore: error: could not execute query: ERROR: relation "pg_catalog.pg_pltemplate" does not exist
Including such checks in the upgrade process might make the upgrade path much easier.
Tomas Barton