$ git clone -n https://src.fedoraproject.org/rpms/Singular.git /var/lib/mock/f43-build-4064243-54014/root/chroot_tmpdir/scmroot/Singular
Cloning into '/var/lib/mock/f43-build-4064243-54014/root/chroot_tmpdir/scmroot/Singular'...
$ git fetch origin f5b2a02a60572c2f055cc6e634a02ee33db1f036:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Singular
 * [new ref]         f5b2a02a60572c2f055cc6e634a02ee33db1f036 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5b2a02 Rebuild for ntl 11.6.0