$ git clone -n https://src.fedoraproject.org/rpms/xml2.git /var/lib/mock/f41-build-side-1-2671375-29139/root/chroot_tmpdir/scmroot/xml2
Cloning into '/var/lib/mock/f41-build-side-1-2671375-29139/root/chroot_tmpdir/scmroot/xml2'...
$ git fetch origin 4e25ac96ac030969cb4638767519c7f019a1ba22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xml2
 * [new ref]         4e25ac96ac030969cb4638767519c7f019a1ba22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e25ac9 convert GPLv2+ license to SPDX