Bernard Li wrote:
> Welcome back! :-)
>
> I'd like to set the seeder with
> /etc/init.d/systemimager-server-bittorrent.
>
> Okay, how about we keep a checksum of the image directory
> /var/lib/systemimager/images/<image> and before we start seeding, we
> check to see if it has changed - if it has, then we run it with the
> --update option - would that work?
That should work almost for everything... even if md5sum (as sha1sum) is
able to evaluate the checksum only for regular files... what about
directories, symlinks and /dev/* files.. think at md5sum /dev/sda or
md5sum /dev/urandom :-).
So the approach would be to save a total checksum for the regular files:
find <image_path> -type f -exec md5sum {} \; | md5sum
And then save a checksum of the metadata informations for special files,
for example with:
find <image_path> -not -type f -exec ls -l {} \; | md5sum
I don't know if it takes more time than running --update all the times...
Cheers,
-Andrea
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