Re: Dealing with corporate email recycling

> * Proposal: UUIDs
> 
> To get what we want (i.e., the ability to run `git show HEAD~1`, know
> that Ada wrote it, and report her current contact information), we
> need some way of tracking identity over time.  A naive solution could
> be to extend the mailmap format as recognized by Git:
> 
>     $ git cat-file blob HEAD~1:.mailmap
>     A. U. Thor <foo@example.com> [uuid A] <ada@example.com>
> 
>     $ git cat-file blob HEAD:.mailmap
>     A. U. Thor <ada@example.com> [uuid A]
>     Roy G. Biv <foo@example.com> [uuid B] <roy@example.com>
> 
> Now, when I run `git show HEAD~1`, Git would determine the UUID of the
> email on the commit using the mailmap version in that tree:
> 
>     $ git -c mailmap.blob=HEAD~1:.mailmap check-mailmap --uuid "<foo@example.com>"
>     A
> 
> Then, we can use that UUID to resolve to the current contact information:
> 
>     $ git check-mailmap --uuid=A
>     A. U. Thor <ada@example.com>
> 
> Mailmap-sensitive commands can use this logic internally -- possibly
> guarded under some new config setting.