Source management for open source project with private changes/patches

[Neo Jia]

hi,

There is an open source project we need to keep track. But after its
each release, we need to pull its post-release patches also, while
having our own private patches.

So, I am wondering if there is any way to make this whole process
automatically. And the ideal way is to make our own private patches to
the tip of the open source project's branch, so we can provide the
patches to 3rd party later.

Is there anything I can read? Any suggestions?

BTW, the open source project is using mercurial.

Thanks,
Neo
-- 
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!