[RFC] git email submissions

For people without _any_ hosting, it would be nice to give them a method to submit some git changes via email.

It seems like most of the necessary stuff is already present in git to bundle up a set of changes. The open questions in my mind are

- what form would the emails take?  MIME-attach a .pack file, plus a 
GPG-signed sha1sum in a separate attachment?

- what's the easiest user interface for selecting the changes?  for my 
usage, it would be

	GIT_GPG_AUTHOR=jgarzik... \
	GIT_DEF_HEADERS=./email.headers \
	git-mkmail --sign master..upstream > email.rfc822
	Enter GPG passphrase:

- what user interface does a kernel maintainer use, to merge changes 
submitted using this method?

- is this all pointless, since the submittor could just email patches? 
[IMO no, git trees are better merges than emailed patches]

Overall, I was thinking it would be nice to have some way to safely transmit a small part of a git tree, including all history information, since its easier to merge git trees than patches.

And for someone without the resources to obtain hosting, email may be the only way to publish a git sub-tree.

	Jeff