$ git clone -n https://src.fedoraproject.org/forks/amigadave/rpms/libxml2.git /var/lib/mock/f43-build-58876196-6568895/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/f43-build-58876196-6568895/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin efc7dae8db0a8ae283d4b63e6bf497cfdfc39549:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/amigadave/rpms/libxml2
 * [new ref]         efc7dae8db0a8ae283d4b63e6bf497cfdfc39549 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efc7dae update to 2.14.2