$ git clone -n https://src.fedoraproject.org/rpms/gkrellm.git /var/lib/mock/f41-build-side-1-2637584-26328/root/chroot_tmpdir/scmroot/gkrellm
Cloning into '/var/lib/mock/f41-build-side-1-2637584-26328/root/chroot_tmpdir/scmroot/gkrellm'...
$ git fetch origin c6e19dc5fde627e428911cc11ae6d21ecd8836fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gkrellm
 * [new ref]         c6e19dc5fde627e428911cc11ae6d21ecd8836fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6e19dc Require gdk-pixbuf2-modules-extra on F41+ to fix crash (rhbz#2276464)