$ git clone -n https://src.fedoraproject.org/rpms/Singular.git /var/lib/mock/f40-build-1213330-22635/root/chroot_tmpdir/scmroot/Singular
Cloning into '/var/lib/mock/f40-build-1213330-22635/root/chroot_tmpdir/scmroot/Singular'...
$ git fetch origin 796181594e3826dd8b4d9f04c834d7efdae6bbde:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Singular
 * [new ref]         796181594e3826dd8b4d9f04c834d7efdae6bbde -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7961815 Version 4.4.0p2