SHA1 collisions are affordable for large actors now and getting cheaper all the time, so git, with its SHA1 assumptions hard-coded, unfortunately doesn't protec

SHA1 collisions are affordable for large actors now and getting cheaper all the time, so git, with its SHA1 assumptions hard-coded, unfortunately doesn't protect you anymore. But the local hash approach is a good one, proven in pip 8 (Python) and npm-lockdown (JS).