$ git clone -n https://src.fedoraproject.org/rpms/fedora-release.git /var/lib/mock/f45-build-58-13/root/chroot_tmpdir/scmroot/fedora-release
Cloning into '/var/lib/mock/f45-build-58-13/root/chroot_tmpdir/scmroot/fedora-release'...
$ git fetch origin 5fea93021ff05d34626529a6cc2c3e186bfd3e6c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-release
 * [new ref]         5fea93021ff05d34626529a6cc2c3e186bfd3e6c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fea930 iot: drop zezere and parsec presets