$ git clone -n https://src.fedoraproject.org/rpms/jxrlib.git /var/lib/mock/f41-build-786010-13590/root/chroot_tmpdir/scmroot/jxrlib
Cloning into '/var/lib/mock/f41-build-786010-13590/root/chroot_tmpdir/scmroot/jxrlib'...
$ git fetch origin af1c8fb892c2c3717e9c610547a0feacdad33a74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jxrlib
 * [new ref]         af1c8fb892c2c3717e9c610547a0feacdad33a74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af1c8fb Eliminate use of obsolete %patchN syntax (#2283636)