I'm not a git expert, but iiuc, git rebase is a way to re-present a subtree as a single checkin, or otherwise re-work the commit tree to clean it up. It's also a big part of git culture.

In fossil, there is such a thing as a private branch that will not be pushed/pulled when repos sync w/ ea. other, but the owner of that private branch can ultimately merge the work, and it will appear as a single atomic commit (ie: a single checkin, not all the multiple artifacts describing the whole of the work in the private branch). I'd think that's the closest thing to rebase that fossil has. Even in that case, though, there's no explicit moving of artifacts; when the work is merged to a public branch though, all the work appears as the condensed net change, in a single checkin.

Otherwise, culturally speaking, re-working of the tree is -not- the way the repository is handled. Errors are fixed w/ corrective checkins, and both will show in the history.

jrockway sheds some light on git rebasing here (http://news.ycombinator.com/item?id=2524993) though, which I'll look into myself to come to understand. Before, I thought rebase was more 'destructive' than what that description indicates.