$ git clone -n https://src.fedoraproject.org/rpms/mingw-libxml2.git /var/lib/mock/f45-build-18593-523/root/chroot_tmpdir/scmroot/mingw-libxml2
Cloning into '/var/lib/mock/f45-build-18593-523/root/chroot_tmpdir/scmroot/mingw-libxml2'...
$ git fetch origin b003f9c28cc9fe75a92c3b8ad7538cdd876e573c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-libxml2
 * [new ref]         b003f9c28cc9fe75a92c3b8ad7538cdd876e573c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b003f9c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild