$ git clone -n https://src.fedoraproject.org/rpms/ldc.git /var/lib/mock/f41-build-1697924-24523/root/chroot_tmpdir/scmroot/ldc
Cloning into '/var/lib/mock/f41-build-1697924-24523/root/chroot_tmpdir/scmroot/ldc'...
$ git fetch origin bab278d7502b738c6cb97b289c2a0e9c7a4d8b7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ldc
 * [new ref]         bab278d7502b738c6cb97b289c2a0e9c7a4d8b7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bab278d convert Boost license to SPDX