Git's usage of SHA1

A long thread on the below list with the above subject (that SHA1
is more or less broken and should be proactively replaced along
the lines of other general global movements off of SHA1) mentioned
the snippet below. The same subject should be given consideration
in monotone as well.

https://lists.sonic.net/mailman/private/crypto-practicum/2016q1/thread.html
  Also, historically speaking git's usage of SHA1 almost certainly came
from monotone (monotone.ca), which Linus used as inspiration for git.
They still use SHA1, but it sounds like it would be much easier to
replace there than in git.


There were some design talk and thread links in there for anyone
interested to subscribe to the sonic c-p archives.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813157
https://git.wiki.kernel.org/index.php/LinusTalk200705Transcript
https://github.com/jayphelps/git-blame-someone-else