$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_distr0.4.git /var/lib/mock/f45-build-44247-811/root/chroot_tmpdir/scmroot/rust-rand_distr0.4
Cloning into '/var/lib/mock/f45-build-44247-811/root/chroot_tmpdir/scmroot/rust-rand_distr0.4'...
$ git fetch origin 3bc354d14614c6815bbd401f5bcdeb6d158c0460:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_distr0.4
 * [new ref]         3bc354d14614c6815bbd401f5bcdeb6d158c0460 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bc354d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild