$ git clone -n https://src.fedoraproject.org/rpms/gnome-shell-extension-system-monitor-applet.git /var/lib/mock/f41-build-side-1-2811757-32932/root/chroot_tmpdir/scmroot/gnome-shell-extension-system-monitor-applet
Cloning into '/var/lib/mock/f41-build-side-1-2811757-32932/root/chroot_tmpdir/scmroot/gnome-shell-extension-system-monitor-applet'...
$ git fetch origin fe75b8dc240c26cb2c301cc11ac4fdf6586ec7cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-shell-extension-system-monitor-applet
 * [new ref]         fe75b8dc240c26cb2c301cc11ac4fdf6586ec7cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe75b8d Updated to last upstream commits