$ git clone -n https://src.fedoraproject.org/rpms/erlang-fast_xml.git /var/lib/mock/f45-build-8305-384/root/chroot_tmpdir/scmroot/erlang-fast_xml
Cloning into '/var/lib/mock/f45-build-8305-384/root/chroot_tmpdir/scmroot/erlang-fast_xml'...
$ git fetch origin e7efa088eac531035345e752d8cd407a5760a669:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-fast_xml
 * [new ref]         e7efa088eac531035345e752d8cd407a5760a669 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7efa08 fast_xml ver. 1.1.61