$ git clone -n https://src.fedoraproject.org/rpms/erlang-fast_xml.git /var/lib/mock/f41-build-1102226-20038/root/chroot_tmpdir/scmroot/erlang-fast_xml
Cloning into '/var/lib/mock/f41-build-1102226-20038/root/chroot_tmpdir/scmroot/erlang-fast_xml'...
$ git fetch origin c989886a3e15fae65c97f26cda020aeede79c715:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-fast_xml
 * [new ref]         c989886a3e15fae65c97f26cda020aeede79c715 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c989886 Switch to SPDX tag