$ git clone -n https://src.fedoraproject.org/rpms/echolinux.git /var/lib/mock/f41-build-749589-13378/root/chroot_tmpdir/scmroot/echolinux
Cloning into '/var/lib/mock/f41-build-749589-13378/root/chroot_tmpdir/scmroot/echolinux'...
$ git fetch origin b9b9703a8e55da15e57ac28ce03f65a2474f352d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/echolinux
 * [new ref]         b9b9703a8e55da15e57ac28ce03f65a2474f352d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9b9703 Eliminate use of obsolete %patchN syntax (#2283636)