$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_distr0.5.git /var/lib/mock/f45-build-44249-811/root/chroot_tmpdir/scmroot/rust-rand_distr0.5
Cloning into '/var/lib/mock/f45-build-44249-811/root/chroot_tmpdir/scmroot/rust-rand_distr0.5'...
$ git fetch origin 5ddffdec0e0b8965bcbac2ebbb2c068188fbe1a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_distr0.5
 * [new ref]         5ddffdec0e0b8965bcbac2ebbb2c068188fbe1a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ddffde Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild