Salt: [BUG] [RC1 Sodium] network.arp cmd does not work on Ubuntu 20

[frogunder]

Description
On 3001rc1 on Ubuntu 20 network.arp command does not work.

https://docs.saltstack.com/en/latest/ref/modules/all/salt.modules.network.html#salt.modules.network.arp

Fails with this error

Command required for 'network.arp' not found: The 'arp' binary was not found in $PATH.

Setup
Install 3001rc1 on a Ubuntu 20 machine.

Steps to Reproduce the behavior
Run salt '*' network.arp

ubu20:
    Command required for 'network.arp' not found: The 'arp' binary was not found in $PATH.
ERROR: Minions returned with non-zero exit code

Expected behavior

ubu18:
    ----------
    00:00:0c:9f:f0:01:
        104.239.135.1
    18:8b:45:d9:71:41:
        104.239.135.3

Versions Report

Salt Version:
           Salt: 3001rc1

Dependency Versions:
           cffi: Not Installed
       cherrypy: unknown
       dateutil: 2.7.3
      docker-py: Not Installed
          gitdb: 2.0.6
      gitpython: 3.0.7
         Jinja2: 2.10.1
        libgit2: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.6.2
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: 3.6.1
         pygit2: Not Installed
         Python: 3.8.2 (default, Mar 13 2020, 10:14:16)
   python-gnupg: 0.4.5
         PyYAML: 5.3.1
          PyZMQ: 18.1.1
          smmap: 2.0.5
        timelib: Not Installed
        Tornado: 4.5.3
            ZMQ: 4.3.2

System Versions:
           dist: ubuntu 20.04 focal
         locale: utf-8
        machine: x86_64
        release: 5.4.0-26-generic
         system: Linux
        version: Ubuntu 20.04 focal

[OrangeDog]

It's in the obsolete package net-tools, which is no longer part of the default installation.
That package has been deprecated for a while (nine years ago).
Replacement commands are as follows:

old | new
-- | --
arp | ip neighbor
ifconfig | ip addr, ip link, ip -stats
iptunnel | ip tunnel
iwconfig | iw
nameif | ip link
netstat | ss
route | ip route

There's probably a wider issue here for all the linux networking functions.

[bryceml]

The plan is to add a Recommends dependency on net-tools to Ubuntu 20.04 for the actual release.

[bryceml]

See https://github.com/saltstack/salt-pack-py3/blob/develop/file_roots/pkg/salt/master/ubuntu2004/spec/salt_ubuntu.tar.xz

I already updated the debian control file.

[eliasp]

For replacing net-tools' functionality, instead of using iproute2's CLI I feel like it might make sense to consider using pyroute2 instead, which is most likely far more performant, since it doesn't shell-out for every function but uses a native Python netlink implementation instead and also eliminates the issue of having to rely on parsing a command's output.

[sagetherage]

Keeping open 57541 and closing this as changes were made in salt-pack-py3 repo for the Sodium release

[OrangeDog]

@bryceml the 3001 release package has net-tools as a required dependency instead of a recommendation.

Can this be fixed?

[bryceml]

It is a recommends dependency, not a required one. We could potentially change it to a suggests dependency. I would want more community input on that. We went with recommends because it would "just work" for people, and they could still remove it if they wanted to.