$ git clone -n https://src.fedoraproject.org/rpms/gnome-shell-extension-gamemode.git /var/lib/mock/f40-build-1999170-44308/root/chroot_tmpdir/scmroot/gnome-shell-extension-gamemode
Cloning into '/var/lib/mock/f40-build-1999170-44308/root/chroot_tmpdir/scmroot/gnome-shell-extension-gamemode'...
$ git fetch origin 09d1bd512d11bb505833c2214062bd89a632a876:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-shell-extension-gamemode
 * [new ref]         09d1bd512d11bb505833c2214062bd89a632a876 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09d1bd5 Declare GNOME 44 and 45 Support (Fixes RHBZ#2187782)