$ git clone -n https://src.fedoraproject.org/rpms/mtr.git /var/lib/mock/f38-build-709209-92800/root/chroot_tmpdir/scmroot/mtr
Cloning into '/var/lib/mock/f38-build-709209-92800/root/chroot_tmpdir/scmroot/mtr'...
$ git fetch origin 15fe7bf50dcc77666bc656a51134477fe35454d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtr
 * [new ref]         15fe7bf50dcc77666bc656a51134477fe35454d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15fe7bf Added upstream patch to fix segmentation fault for '-r' (#2188394)