$ git clone -n https://src.fedoraproject.org/rpms/rust-prost-types.git /var/lib/mock/f41-build-side-1-2902629-34658/root/chroot_tmpdir/scmroot/rust-prost-types
Cloning into '/var/lib/mock/f41-build-side-1-2902629-34658/root/chroot_tmpdir/scmroot/rust-prost-types'...
$ git fetch origin b8965be433f3eab5ffeb2c1980152d380a6b8c53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prost-types
 * [new ref]         b8965be433f3eab5ffeb2c1980152d380a6b8c53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8965be Update to version 0.13.3; Fixes RHBZ#2313986