Found out all of the nics cards on a system

[Jerome Jean Verleyen]

Dear all.

I'm really new on Cfengine, and learning on the way.,..

What i need now is to get the list of all the networds cards present in one system, to configure specific one on an ipv4 network. I do use the sys.interfaces variables. But this get me back uniquely the configured interfaces, not alla of then.

What get me the cfengine report:

R: Value of nics  lo
R: Value of nics  eth0 

What i have on my system:

# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
   
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:5f:b0:58 brd ff:ff:ff:ff:ff:ff
    inet 172.16.1.11/24 brd 172.16.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe5f:b058/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 52:54:00:23:70:cb brd ff:ff:ff:ff:ff:ff

I don't found out how to get back eth1, in this case...

Is there a function or variable i could use for this purpose?

Thank's a lof!

Regards

[Nick Anderson]

What i need now is to get the list of all the networds cards present in one system, to configure specific one on an ipv4 network. I do use the sys.interfaces variables. But this get me back uniquely the configured interfaces, not alla of then.

Do any of the sys vars contain what you are looking for (cf-promises --show-vars)

Perhaps sys.interfaces_data?

bundle agent __main__
{
     vars:
        "sys_interfaces_data_keys"
          slist => getindices( "sys.interfaces_data" );

      reports:
          "$(sys_interfaces_data_keys)";
}

R: lo
R: wlp0s20f3
R: virbr0
R: br-a7d465b9949b
R: docker0
R: enx0892048803e7
R: enx5cff35c6864b
R: vboxnet0
R: tun0

[Jerome Verleyen]

Dear Nick and others

Thank's for answer me so quickly. I do some test to check  out your code.

You're right in using cf-promises command to get back this variables.

I do a bundle to test it, and have some good results:

bundle agent network
{

  vars:
      "sys_interfaces" slist => getindices("sys.interfaces");

      "sys_interfaces_data_keys" slist => getindices( "sys.interfaces_data" );
      

      "sys_ipv4" slist => getindices("sys.ipv4");
      
  reports:
      
    any::
      "Value of sys_interfaces $(sys_interfaces)";

      "Value of sys_interfaces_data $(sys_interfaces_data_keys)";
      
      "value of sys_ipv4: $(sys_ipv4)";
      
}

That get me this report:

R: Value of sys_interfaces_data lo
R: Value of sys_interfaces_data enp1s0
R: Value of sys_interfaces_data enp7s0
R: Value of sys_interfaces_data enp8s0
R: Value of sys_interfaces_data virbr0
R: value of sys_ipv4: enp8s0
R: value of sys_ipv4: lo
R: value of sys_ipv4: enp7s0
R: value of sys_ipv4: virbr0
R: value of sys_ipv4: enp1s0

So, "sys.interfaces_data" is the good variable. But i've got an issue that i could no explain: Why could i no get the list of the sys.interfaces name? With the variable "sys_interfaces", I've get anything, as show before.

But if i wirte directly in report as this:

  reports:
      
    any::
      "Value of sys_interfaces $(sys.interfaces)";

I get back this report:

R: Value of sys_interfaces enp1s0
R: Value of sys_interfaces enp7s0
R: Value of sys_interfaces enp8s0
R: Value of sys_interfaces virbr0

I could not understand why the variable definition of sys_interfaces get back a null list...

Hope that someone could help me.

Regards

-- 
-- Jérôme 
Les jeunes gens voudraient être fidèles et ne le sont pas. 
Les vieux voudraient être infidèles et ne le peuvent plus.
	(Oscar Wilde)

[Nick Anderson]

Without running it myself and inspecting the details...

You don't see reports for this promise:

      "Value of sys_interfaces $(sys_interfaces)";

Because sys_interfaces isn't defined. 

It's not defined because getindices() on a list has no result. I think it would make sense that it return the numeric positions of the elements, basically length - 1 and there might even be a ticket with that request, but it's a very niche case when you could just iterate on sys.interfaces. The docs do indicate the function takes an array (classic associative), or data container. 

https://docs.cfengine.com/docs/3.24/reference-functions-getindices.html

You can copy the list like this:

   "sys_interfaces" slist => { @(sys.interfaces) };

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[Jerome Verleyen]

Le 20/11/2024 à 22:34, Nick Anderson a écrit :
> Without running it myself and inspecting the details...
>
> You don't see reports for this promise:
>       "Value of sys_interfaces $(sys_interfaces)";
>
> Because sys_interfaces isn't defined.
>
> It's not defined because getindices() on a list has no result. I think
> it would make sense that it return the numeric positions of the
> elements, basically length - 1 and there might even be a ticket with
> that request, but it's a very niche case when you could just iterate
> on sys.interfaces. The docs do indicate the function takes an array
> (classic associative), or data container.
> https://docs.cfengine.com/docs/3.24/reference-functions-getindices.html
>
> You can copy the list like this:
>
>    "sys_interfaces" slist => { @(sys.interfaces) };

Dear Nick.

You're right! Thank's for your explanations. As you can imagine, i'm
very new in this stuff..

Regards!

--
-- Jérôme
En essayant continuellement, on finit par réussir. Donc:
Plus ça rate, plus on a de chance que ça marche.
(Devise Shadok)