Headless server on NAS readonly problem

[artifact]

I'm trying the NAS for a calibre-server source trick others have done and get the following:

error: Traceback (most recent call last):
File "site.py", line 58, in main
File "site-packages/calibre/library/server/main.py", line 114, in main
File "site-packages/calibre/library/database2.py", line 201, in __init__
File "site-packages/calibre/library/database2.py", line 290, in initialize_dynamic
File "site-packages/calibre/library/sqlite.py", line 304, in run
DatabaseException: attempt to write a readonly database
RemoteTraceback (most recent call last):
File "site-packages/calibre/library/sqlite.py", line 264, in run
OperationalError: attempt to write a readonly database

Command line:
/usr/share/calibre/calibre-server --with-library=/mnt/backup/Calibre --port=3456 --develop

--develop was added due to a January thread about log writing which I hoped would take care of readonly .

GUI use is on a Macbook and is never simultanous and confirmed to be shut down when I've tried to start the server. NAS is a Buffalo which uses XFS file format though I can copy stuff back and forth from Windows, Mac, and linux with no trouble so I don't -think- XFS would be to blame. Squeezeserver serves up music fine to multiple devices from the '/mnt/backup' drive so I don't think that is an issue.

Help! Where is the 'readonly database' is coming from?

(The plan is UIless web-only, read only service where I can download books to my WiFi reader from my always on linux box. Test trials on the Macbook with the GUI had it working great -- now to port it over.)

[kovidgoyal]

That error means the metadata.db file in your calibre library is read only.