$ git clone -n https://src.fedoraproject.org/rpms/argon2.git /var/lib/mock/f31-build-54599-28018/root/thebuilddir/tmp/scmroot/argon2
Cloning into '/var/lib/mock/f31-build-54599-28018/root/thebuilddir/tmp/scmroot/argon2'...
$ git reset --hard 631def3b65f2ef1934fff47e33b406f18fccbd09
HEAD is now at 631def3 Update to version 20171227 (rh #1560753).