$ git clone -n https://src.fedoraproject.org/rpms/rust-spake2.git /var/lib/mock/f45-build-45193-821/root/chroot_tmpdir/scmroot/rust-spake2
Cloning into '/var/lib/mock/f45-build-45193-821/root/chroot_tmpdir/scmroot/rust-spake2'...
$ git fetch origin cbd9c467bd242d150835dd639b8fedf21e06679e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-spake2
 * [new ref]         cbd9c467bd242d150835dd639b8fedf21e06679e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbd9c46 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild