using --reduce-factor disables --except

[idallen]

This is from iprange 1.0.5_master.

First, set up two test files:

    $ cat <<EOF >in
    1.2.3.4
    1.2.3.5
    1.2.3.6
    9.9.9.6
    9.9.9.7
    9.9.9.8
    9.9.9.9
    EOF

    $ cat <<EOF >except
    1.2.3.4
    1.2.3.5
    1.2.3.6
    EOF

Without using --reduce-factor I get the expected output:

    $ iprange in --except except >out
    $ iprange in --diff out
    1.2.3.4/31
    1.2.3.6

Using any value of --reduce-factor causes the --except to be ignored:

    $ iprange in --except except --reduce-factor 0 >out
    $ iprange in --diff out
    $ iprange in --except except --reduce-factor 10 >out
    $ iprange in --diff out
    $ iprange in --except except --reduce-factor 90 >out
    $ iprange in --diff out
    $ diff in out
    $

[idallen]

If you do the operations sequentially, you get the correct output:

$ iprange in --except except >tmp
$ iprange tmp --reduce-factor 90 >out
$ iprange in --diff out
1.2.3.4/31
1.2.3.6

If you reverse the order of the two options, you get the correct output:

$ iprange in --reduce-factor 90 --except except >out
$ iprange in --diff out
1.2.3.4/31
1.2.3.6

[ktsaou]

Confirmed — this bug is still present in v2.0.0. --reduce-factor unconditionally overwrites the operation mode, so placing it after --except causes the exclusion to be ignored.

Workaround: place --reduce-factor before --except:

iprange in --reduce-factor 90 --except except

A proper fix is planned for the next release to make --ipset-reduce a modifier that applies after the primary operation.