$ git clone -n https://src.fedoraproject.org/rpms/Singular.git /var/lib/mock/f42-build-3406828-45143/root/chroot_tmpdir/scmroot/Singular
Cloning into '/var/lib/mock/f42-build-3406828-45143/root/chroot_tmpdir/scmroot/Singular'...
$ git fetch origin 40c978c2a4cb868fc429480bf0bbcaa57b9fae00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Singular
 * [new ref]         40c978c2a4cb868fc429480bf0bbcaa57b9fae00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40c978c Version 4.4.1