$ git clone -n https://src.fedoraproject.org/rpms/debbuild.git /var/lib/mock/f41-build-side-1-2633888-25976/root/chroot_tmpdir/scmroot/debbuild
Cloning into '/var/lib/mock/f41-build-side-1-2633888-25976/root/chroot_tmpdir/scmroot/debbuild'...
$ git fetch origin 1a87fcd05f97ce5a93419a3bc24ab249d7f148d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/debbuild
 * [new ref]         1a87fcd05f97ce5a93419a3bc24ab249d7f148d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a87fcd convert GPLv2+ license to SPDX