On Mon, Apr 08, 2013 at 08:40:36AM -0700, Junio C Hamano wrote:
> With or without the security issue, leaving old object names that
> will become irrelevant in the rewritten history will make the
> resulting history less useful, simply because people cannot look at
> the objects these messages refer to. The same argument is behind the
> reason why "cherry-pick -x" was originally the default, found to be
> a mistake and made optional.
> filter-branch provides "map" helper function to help mapping old
> object names to rewritten object names, but stops there; it leaves
> it up to the message filter script to identify what string in the
> message is an object name to be rewritten.
> It can be taught to be more helpful to the message filter writers,
> and you seem to have done so in BFG, which is very good.
Yeah, it would make sense for filter-branch to have a "--map-commit-ids"
option or similar that does the update. At first I thought it might take
two passes, but I don't think it is necessary, as long as we traverse
the commits topologically (i.e., you cannot have mentioned X in a commit
that is an ancestor of X, so you do not have to worry about mapping it
until after it has been processed).
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