$ git clone -n https://src.fedoraproject.org/rpms/grub2-breeze-theme.git /var/lib/mock/f41-build-side-115201-61076142-6588638/root/chroot_tmpdir/scmroot/grub2-breeze-theme
Cloning into '/var/lib/mock/f41-build-side-115201-61076142-6588638/root/chroot_tmpdir/scmroot/grub2-breeze-theme'...
$ git fetch origin 1d481de7a81cde602b4398c8150ed6fe49cb46c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grub2-breeze-theme
 * [new ref]         1d481de7a81cde602b4398c8150ed6fe49cb46c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d481de 6.4.3