Server coredumps in multiple usecases - lacks basic protection

[mhagander]

The code in pgespresso lacks basic safety checks against incorrect usage, and is trivial to crash the server hard with. For example, running any of the stop commands in a fresh database where nothing has been done already:

postgres=# select pgespresso_abort_backup();
The connection to the server was lost. Attempting reset: Failed.

Or

postgres=# select pgespresso_stop_backup('foo');
The connection to the server was lost. Attempting reset: Failed.

[mhagander]

This affects all supported PostgreSQL versions.