$ git clone -n https://src.fedoraproject.org/rpms/herbstluftwm.git /var/lib/mock/f45-build-13390-450/root/chroot_tmpdir/scmroot/herbstluftwm
Cloning into '/var/lib/mock/f45-build-13390-450/root/chroot_tmpdir/scmroot/herbstluftwm'...
$ git fetch origin 26a07d7106dbd10788b3364488c598561ae5be02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/herbstluftwm
 * [new ref]         26a07d7106dbd10788b3364488c598561ae5be02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26a07d7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild