$ git clone -n https://src.fedoraproject.org/rpms/Singular.git /var/lib/mock/f41-build-710603-13019/root/chroot_tmpdir/scmroot/Singular
Cloning into '/var/lib/mock/f41-build-710603-13019/root/chroot_tmpdir/scmroot/Singular'...
$ git fetch origin 76c28904ba3b4e5ad238291bbf39c9cb32b1469e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Singular
 * [new ref]         76c28904ba3b4e5ad238291bbf39c9cb32b1469e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76c2890 Non-bootstrap build