$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_isaac0.3.git /var/lib/mock/f45-build-44248-811/root/chroot_tmpdir/scmroot/rust-rand_isaac0.3
Cloning into '/var/lib/mock/f45-build-44248-811/root/chroot_tmpdir/scmroot/rust-rand_isaac0.3'...
$ git fetch origin bebe9c33afaa6b96e1ca4e9cedb143283b6e9452:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_isaac0.3
 * [new ref]         bebe9c33afaa6b96e1ca4e9cedb143283b6e9452 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bebe9c3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild