$ git clone -n https://src.fedoraproject.org/rpms/gnome-system-monitor.git /var/lib/mock/f41-build-851774-166061/root/chroot_tmpdir/scmroot/gnome-system-monitor
Cloning into '/var/lib/mock/f41-build-851774-166061/root/chroot_tmpdir/scmroot/gnome-system-monitor'...
$ git fetch origin 3cbb90a0c59a51a6364afe462478c715760062b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-system-monitor
 * [new ref]         3cbb90a0c59a51a6364afe462478c715760062b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3cbb90a Update to 47.0