$ git clone -n https://src.fedoraproject.org/rpms/greenboot.git /var/lib/mock/f41-build-852251-166301/root/chroot_tmpdir/scmroot/greenboot
Cloning into '/var/lib/mock/f41-build-852251-166301/root/chroot_tmpdir/scmroot/greenboot'...
$ git fetch origin 0dda840930b50efbeeed6a56104ee6932ef621be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/greenboot
 * [new ref]         0dda840930b50efbeeed6a56104ee6932ef621be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0dda840 Update to 0.15.6 upstream release