Luci openWRT UCI firewall rule update without position number - bash

Question

Hey all I have been trying find some code that would allow me to update my firewall rule via the UCI.
The way I am currently adding the new rule is like this:
uci add firewall rule
uci set firewall.#rule[21].name='B Macbook Air'
uci set firewall.#rule[21].src='lan'
uci set firewall.#rule[21].family='ipv4'
uci set firewall.#rule[21].src_ip='192.168.1.227'
uci set firewall.#rule[21].src_mac='00:00:00:00:00:00'
uci set firewall.#rule[21].dest='wan'
uci set firewall.#rule[21].proto='all'
uci set firewall.#rule[21].target='REJECT'
uci set firewall.#rule[21].enabled='1'
uci commit firewall
This produces the correct rule inside luci (branch (git-22.347.45520-d30ab74)):
The way I update one of the rules' enabled or disable is this:
uci set firewall.#rule[21].name="B Macbook Air"
uci set firewall.#rule[21].enabled="1"
uci commit firewall
Which works as expected but I am wondering if there's a way too just call the firewall rules name instead of needing to know the position (ie: [21])?
Like this:
uci set firewall.#rule.name="B Macbook Air"
uci set firewall.#rule.enabled="1"
uci commit firewall
But of course the above does not work. Gives an error of
root#turris:~# uci set firewall.#rule.name="B Macbook Air"
uci: Invalid argument
Is this possible to do?

Answer 1

You can write a loop to check each rule's .name.
The following example supposes the index numbers start from 0 and are consecutive.
(Not sure if bash is installed by default. The example code is in sh.)
#!/bin/sh
name='Support-UDP-Traceroute'
option=enabled
value=1
i=0
while true; do
rname=$( uci get "firewall.#rule[$i].name" 2> /dev/null )
if [ $? != 0 ]; then
# no more rules
break
fi
if [ "$rname" = "$name" ]; then
echo "found: $name: [$i]"
# uci set firewall.#rule[$i].$option="$value"
# uci commit firewall
break
fi
let i++
done
Make it a function if you need to do this often. And you need to update it a bit if the index numbers are not consecutive.
Another solution is to use uci show firewall:
i=$( uci show firewall | grep/sed/awk/... )
uci set firewall.#rule[$i].the_option="the_value"
uci commit firewall
This way you don't care if the index numbers are consecutive or not.