$ git clone -n https://src.fedoraproject.org/rpms/libFS.git /var/lib/mock/f45-build-15777-479/root/chroot_tmpdir/scmroot/libFS
Cloning into '/var/lib/mock/f45-build-15777-479/root/chroot_tmpdir/scmroot/libFS'...
$ git fetch origin 6d06e18a1fe7d50679a26a997fa71487a98b3b7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libFS
 * [new ref]         6d06e18a1fe7d50679a26a997fa71487a98b3b7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d06e18 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild