Hello
I don't know if it's a bug, but I have lost many time yesterday with that.
First, I installed a roundcube with sqlite and the sample configuration "sqlite://./sqlite.db". It work :-).
Yesterday, I want to move my db to another directory, "/var/roundcube/roundcube.bd". I updated my db.inc.php with the new db_dsnw "sqlite:///var/roundcube/roundcube.db". It doesn't work :-(, I have the screen with error "Error No. 1f4)".
After research, config is parsed by "parseDSN()" of DB.php with the patern "phptype://hostspec/database".
sqlite://./sqlite.db phptype = sqlite hostspec = . database = sqlite.db ==> sqlite use the file "sqlite.db" (In fact, it's the same that './sqlite.db').
sqlite:///var/roundcube/roundcube.db phptype = sqlite hostspec = database = var/roundcube/roundcube.db ==> this config doesn't work.
sqlite:////var/roundcube/roundcube.db phptype = sqlite hostspec = database = /var/roundcube/roundcube.db ==> this config works.
Maybe I'm an idot to try 'sqlite:///var/roundcube/roundcube.db' but I think it is more intuitive than 'sqlite:////var/roundcube/roundcube.db'.
I'm not sure that is possible to fixe the function 'parseDSN()' because we can't do a generic solution for parse "mysql://localhost/db" and "sqlite://path/to/db". The solution is maybe to add a note to db.inc.php.dist to explain the problem.
Black Myst.
PS : If you think it's a bug, I will open new ticket tomorrow