$ git clone -n https://src.fedoraproject.org/rpms/rpmspectool.git /var/lib/mock/f45-build-34671-690/root/chroot_tmpdir/scmroot/rpmspectool
Cloning into '/var/lib/mock/f45-build-34671-690/root/chroot_tmpdir/scmroot/rpmspectool'...
$ git fetch origin 01e5a9907b51fe0c9091a2f3e4b73b5aec8fa8c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmspectool
 * [new ref]         01e5a9907b51fe0c9091a2f3e4b73b5aec8fa8c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01e5a99 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild