turning on the viewcvs query feature

[James Henstridge <james jamesh id au>]

Now that Ross has set up Bonsai, it would be nice to turn on the query 
database feature.  While it provides similar functionality to bonsai's 
query page, it has the benefit of being more tightly integrated with the 
rest of viewcvs.

The main steps to get it enabled are:

1. update viewcvs from CVS.  This can be done by performing a checkout 
of the viewcvs-web module somewhere, and running the command 
"./viewcvs-install --prefix=/usr/local/www/viewcvs-web", and then follow 
the prompts (if it asks, choose to overwrite existing files).

2. install the MySQL-python package (Python bindings for MySQL).

3. edit the /usr/local/www/viewcvs-web/viewcvs.conf file's [cvsdb] 
section, and fill in host, database_name, readonly_user and 
readonly_password.  The "enabled" setting should be set to 1.  The user 
account only needs read-only access to the bonsai checkin database.

That should be all that's needed to turn it on.  There should be a 
"Query revision history" link at the top of each directory listing page 
in viewcvs, which will take you to the query form.

Currently we maintain the viewcvs conf file in CVS, so it would be nice 
if the changes to the [cvsdb] section could be merged back in.  I don't 
think there is much of a problem having the password in CVS because:
- the database user account only needs read access.
- the account could be limited to logins from cvs.gnome.org.
- all the information in the checkin database is publicly available in 
the CVS repository.

James.