Bazaar support adding meta data to commit to record who the actual author of a change is vs. the person who commits the change:
$ bzr commit --author "Jane Rey <jrey@example.com>" \
--author "John Doe <jdoe@example.com>"
After adding this meta data it accessible via bzr log, like:
------------------------------------------------------------ revno: 105661 fixes bug(s): http://debbugs.gnu.org/9414 author: Oleksandr Gavenko committer: Juri Linkov branch nick: trunk timestamp: Mon 2011-09-05 12:55:11 +0300 message: * lisp/progmodes/grep.el (rgrep): Add "-type d".
It is possible embed such metadata in commit for Mercurial/Git?
In git you have the similar command:
git commit --author="Name <name@example.com>"
But it usually comes from pre-set config values.
Hg has a similar flag for setting the user, but does not make a distinction between author and committer. But there is an extension to do that.
Both git and hg do not have the concept of setting multiple authors for a commit. Though that is usually done in the commit message in some pre-determined way / convention in the team