problem

If you misspell primary storage path (e.g. on a nfs share), the zone launch fails. Fix the issue takes me to the correct page to correct the spelling. However, the launch then fails because the host is created and already in the database.

The only way to recover is to delete the entry from host table and then retry.

versions

4.20

The steps to reproduce the bug

1. Clean install management server + compute host
2. When you are in webui zone creation / storage, enter incorrect primary NFS storage path (e.g. /export/primary instead of /exports/primary).
3. Launch zone will fail due to being unable to connect to primary storage.
4. Fix the misspelled primary storage path, launch again
5. Error shows that the host is already in the database
   ...

What to do about it?

Either roll-back the host creation from the DB or tolerate existing host entry?