Error calling dolt_clone from a hosted instance

[tbantle22]

When I connect to a sql server from hosted and then try to call dolt_clone I get this error.

mysql> use coronavirus;
Database changed
mysql> call dolt_clone("dolthub/corona-virus");
ERROR 1105 (HY000): unable to clone remote database; no remote dialer configured

It's possible the port to clone is not open on the hosted instance

[fulghum]

I wasn't able to repro this before, but just figured it out...

When a Dolt sql-server starts up with no databases, you currently see this error after you create a database, use it, and call dolt_clone. However... if you stop the server and restart it, then dolt_clone works as expected. This seems to be something related to how we initialize the database provider and must not be setting the remote dialer.

[fulghum]

Found it! The provider's RemoteDialer comes from MultiRepoEnv.RemoteDialProvider, and that code just grabs the remote dialer from the first DoltEnv, otherwise returns nil if there aren't any DoltEnvs. I'll see if we can fake enough of a DoltEnv in that case to make the dialer work.