how to find out where a commit is from

[Uwe Brauer]

Hi

Thats sound a bit bizarre: I am one of the maintainer of matlab-emacs.
The original repo is a git repo which dwells in sourceforge and it is
mirrored in github.

I am using the hg-git plugin to access the repo. Now it so happens that
in my local repo, I have a branch (bookmark) which I still did not push,
but I did not recall where it was from, (I did not make it for sure).
Finally the issue was solved since the author of that branch told me it
was originally in github but he deleted the branch in github (which if I
am not mistaken you cannot do in mercurial).

So I was wondering if there exists a hg extension which would tell me
where a specific commit is from (in that case it was pulled from github)

I am using the blackbox extension (but only activated it 4 month ago,
so that pull could not have been registered).  Still it seems that the
blackbox extension does not tell me

 commit  164 pulled from github....

Which is what I want.

Does such an extension exist?

Thanks and regards

Uwe Brauer