On Wed, Jan 15, 2014 at 06:13:30AM -0500, Jeff King wrote:
> On Wed, Jan 15, 2014 at 11:37:08AM +0100, David Kastrup wrote:
> > The question is what guarantees I have with regard to the commit date of
> > a commit in relation to that of its parent commits:
> > 
> > a) none
> > b) commitdate(child) >= commitdate(parent)
> > c) commitdate(child) > commitdate(parent)
> a) none
> > Obviously, I can rely on c) being true "almost always":
> Actually, b) is quite often the case in automated processes (e.g., "git
> am" or "git rebase"). The author dates are different, but the committer
> dates may be in the same second.
> And of course a) is the result of clock skew and software bugs.

... or importing non-git repositories that don't have commit info
separated from author info like git does. In such cases, it's usual to
duplicate the author info as commit info so that clones of the same
non-git repo end up with the same git sha1s. Mercurial easily allows
author dates to be in a non topological order.

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