$ git clone -n https://src.fedoraproject.org/rpms/tokyocabinet.git /var/lib/mock/f41-build-725846-13123/root/chroot_tmpdir/scmroot/tokyocabinet
Cloning into '/var/lib/mock/f41-build-725846-13123/root/chroot_tmpdir/scmroot/tokyocabinet'...
$ git fetch origin 14227f23b71a49bcf8402a0ac1d3ca85219c9d7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tokyocabinet
 * [new ref]         14227f23b71a49bcf8402a0ac1d3ca85219c9d7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14227f2 Eliminate use of obsolete %patchN syntax (#2283636)