$ git clone -n https://src.fedoraproject.org/rpms/fbzx.git /var/lib/mock/f41-build-side-1-2635141-26097/root/chroot_tmpdir/scmroot/fbzx
Cloning into '/var/lib/mock/f41-build-side-1-2635141-26097/root/chroot_tmpdir/scmroot/fbzx'...
$ git fetch origin 8bbe2c0bef5b887727b8df2590f9fd505a917ede:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbzx
 * [new ref]         8bbe2c0bef5b887727b8df2590f9fd505a917ede -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8bbe2c0 convert GPLv3+ license to SPDX