$ git clone -n https://src.fedoraproject.org/rpms/sysprof.git /var/lib/mock/f40-build-787506-134782/root/chroot_tmpdir/scmroot/sysprof
Cloning into '/var/lib/mock/f40-build-787506-134782/root/chroot_tmpdir/scmroot/sysprof'...
$ git fetch origin 1c800b666dbfc3c3a49543b0c9637425d3411976:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sysprof
 * [new ref]         1c800b666dbfc3c3a49543b0c9637425d3411976 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c800b6 Update to 46.beta