$ git clone -n https://src.fedoraproject.org/rpms/389-ds-base.git /var/lib/mock/f42-build-3181709-40950/root/chroot_tmpdir/scmroot/389-ds-base
Cloning into '/var/lib/mock/f42-build-3181709-40950/root/chroot_tmpdir/scmroot/389-ds-base'...
$ git fetch origin ca8f74ff676b86678d0e3f2aa3796445edd570bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/389-ds-base
 * [new ref]         ca8f74ff676b86678d0e3f2aa3796445edd570bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca8f74f Replace python3-magic with python3-file-magic