Allow my usual user reconnect to wifi without root pass and also replace wpa config

[znavko--- via <help-guix@gnu.org>]

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Hello! Happy New Year, Guix Help!

I'd like to make my OS a bit comfortable for usual user.

I use only wpa_supplicant + dhclient without any utility that gives control over wifi to usual users.
And I want to give such a control by my own hands and your advice.

Wi-fi connection sometimes is loosing, and the way to reconnect is to restart hurd services.
I do it by root beautifully. I need to allow usual user to do this too.

With that task I also have two providers: wired ISP and Mobile ISP -
And I have such a script for choosing between them.
Attachment: wpa

So this script fulfill things of reconnection and changing wpa_supplicant.conf
very easy for root.
I want to allow to usual user just to run:

$ /wpa isp

and my script reconnect to wifi again.

I tried to give root privileges for user 'bob' to run script /wpa with this line in /etc/sudoers:
# cat /etc/sudoers
root ALL=(ALL) ALL
%wheel ALL=(ALL) ALL
user ALL=(bob) NOPASSWD: /wpa
#groups bob
bob : users wheel video audio netdev
But I still have these error messages:

$ sudo -u bob /wpa isp
Connecting to ISP provider
cp: cannot create regular file '/etc/wpa_supplicant/wpa_supplicant.conf': Permission denied
error: connect: /run/user/1000/shepherd/socket: No such file or directory
error: connect: /run/user/1000/shepherd/socket: No such file or directory
^X^C
$
Please, what to do here?

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#!/bin/sh

usage() {
  echo "Usage: $0 provider"
  echo "where provider is one of using providers"
  exit 1
}

if [ $# -eq 0 ]
  then
    echo "No arguments supplied"
    usage
fi

case "$1" in
  "isp")
    echo "Connecting to ISP provider"
    cp /etc/wpa_supplicant/wpa_isp.conf /etc/wpa_supplicant/wpa_supplicant.conf
    herd stop networking
    herd stop wpa-supplicant
    sleep 8
    herd start wpa-supplicant
    sleep 8
    herd start networking
    ;;
  "bee")
    echo "mob"
    echo "Connecting to Mobile provider"
    cp /etc/wpa_supplicant/wpa_mob.conf /etc/wpa_supplicant/wpa_supplicant.conf
    herd stop networking
    herd stop wpa-supplicant
    sleep 8
    herd start wpa-supplicant
    sleep 8
    herd start networking
    ;;
  *)
    echo "Provider is not of cases"
    exit 2;
esac