$ git clone -n https://src.fedoraproject.org/rpms/rust-sha-1_0.9.git /var/lib/mock/f45-build-44889-818/root/chroot_tmpdir/scmroot/rust-sha-1_0.9
Cloning into '/var/lib/mock/f45-build-44889-818/root/chroot_tmpdir/scmroot/rust-sha-1_0.9'...
$ git fetch origin 4d8bad544efdb93f31bbe0f988e0be0ed6bc96b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha-1_0.9
 * [new ref]         4d8bad544efdb93f31bbe0f988e0be0ed6bc96b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d8bad5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild