"Shawn O. Pearce" <spearce@spearce.org> writes:

quoted text
>   git-diff $old $new | git-apply --index ?
>
> If the patch does not apply, nothing gets updated.  If it does apply,
> the index is also updated and stat data updated.

And if you are only checking then perhaps instead of --index
use --check, so that the actual updates are deferred?

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