$ git clone -n https://src.fedoraproject.org/rpms/gnome-system-monitor.git /var/lib/mock/f40-build-805553-144813/root/chroot_tmpdir/scmroot/gnome-system-monitor
Cloning into '/var/lib/mock/f40-build-805553-144813/root/chroot_tmpdir/scmroot/gnome-system-monitor'...
$ git fetch origin d39b582d82539d4cfb49ccc87ad0df0bfce26949:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-system-monitor
 * [new ref]         d39b582d82539d4cfb49ccc87ad0df0bfce26949 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d39b582 Update to 46.0