$ git clone -n https://src.fedoraproject.org/rpms/rpm-git-tag-sort.git /var/lib/mock/f45-build-34649-690/root/chroot_tmpdir/scmroot/rpm-git-tag-sort
Cloning into '/var/lib/mock/f45-build-34649-690/root/chroot_tmpdir/scmroot/rpm-git-tag-sort'...
$ git fetch origin 6326c252876dcb9e8923f1bfe82e00c0780fc290:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpm-git-tag-sort
 * [new ref]         6326c252876dcb9e8923f1bfe82e00c0780fc290 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6326c25 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild