Brian Harring wrote:
> The proposal is pretty simple; if code modifies the vdb in any 
> fashion, it needs to update the mtime on a file named 
> '.modification_time' in the root of the vdb.

I'd to prefer using the mtime of the /var/db/pkg directory itself,
since existence of a '.modification_time' file isn't going to prove
that an programs that don't recognize that file haven't made any
modifications.

We can also use the mtimes of category subdirectories, in order to
indicate whether a modification has occurred in any given category.
-- 
Thanks,
Zac