$ git clone -n https://src.fedoraproject.org/rpms/grub2-breeze-theme.git /var/lib/mock/f40-build-802458-144016/root/chroot_tmpdir/scmroot/grub2-breeze-theme
Cloning into '/var/lib/mock/f40-build-802458-144016/root/chroot_tmpdir/scmroot/grub2-breeze-theme'...
$ git fetch origin 97691eeed6592c4fd9b61937647b2944b971486e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grub2-breeze-theme
 * [new ref]         97691eeed6592c4fd9b61937647b2944b971486e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 97691ee 6.0.3