When Odoo is started with a db_user using 'postgres', the process
exits with a status 1. However, this can be bypassed when the
PGUSER environment variable is used.
This commit will prevent the usage of the 'postgres' for the
environment variable too.
Also, when trying to list db's, various methods where used to find a
suitable postgres user to get this list.
In fact, as the db cursor is available, a user is already at work.
So, in order to avoid code duplication (e.g. verify user from
environment variables), this commit removes those various method
and get the db user from the cursor.
trans_export has been decided to use a *bytes* output buffer as some of
the output formats are text-ish (e.g. po) but others are definitely
binary content (e.g. XML). Therefore, when calling trans_export with a
*file*, it needs to be open in *binary mode*.
Fixes#20555
In case Postresgl access rights prevents the pguser to access
`pg_database`, the server should not crash when trying to create the
database because the pguser does not have the right to check if the
database exists and he won't be able to create a new database anyway.
However the database might exists and in such a case the flow should
continue. This patch allows the flow to be resumed in such a case, and
in case the database did not actually exists, a warning will tell the
user that it was not possible to check if the db existed and the
registry for this database will fail to be loaded afterward.
Christophe Monniez