$ git clone -n https://src.fedoraproject.org/rpms/converseen.git /var/lib/mock/f40-build-1915290-25086/root/chroot_tmpdir/scmroot/converseen
Cloning into '/var/lib/mock/f40-build-1915290-25086/root/chroot_tmpdir/scmroot/converseen'...
$ git fetch origin 00d0845a475487bd6bb3a64c38f4cae2b4007fe1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/converseen
 * [new ref]         00d0845a475487bd6bb3a64c38f4cae2b4007fe1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00d0845 update to 0.12.2.3 fixes rbhz#2268815