$ git clone -n https://src.fedoraproject.org/rpms/libsass.git /var/lib/mock/f45-build-16924-493/root/chroot_tmpdir/scmroot/libsass
Cloning into '/var/lib/mock/f45-build-16924-493/root/chroot_tmpdir/scmroot/libsass'...
$ git fetch origin fbeacfff463dff16e5e31e7d9bbbea3f9a03bfb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsass
 * [new ref]         fbeacfff463dff16e5e31e7d9bbbea3f9a03bfb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbeacff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild