$ git clone -n https://src.fedoraproject.org/rpms/CImg.git /var/lib/mock/f41-build-side-1-2816977-32981/root/chroot_tmpdir/scmroot/CImg
Cloning into '/var/lib/mock/f41-build-side-1-2816977-32981/root/chroot_tmpdir/scmroot/CImg'...
$ git fetch origin 62e9a4ab53da4efede6d08cfdc0c3a4a904b1121:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/CImg
 * [new ref]         62e9a4ab53da4efede6d08cfdc0c3a4a904b1121 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62e9a4a bump version