How to set empty leaf in Python

[abdelseaudi]

When I try to get junos configuration using nso cli, it works:

admin@ncs# devices device vmx1 rpc rpc-get-configuration get-configuration config-text | display xml
<configuration-text xmlns='_juniper-junos-nc-4.6:juniper-junos-nc-4.6#urn:juniper-rpc'>## Last changed: 2021-06-02 22:48:40 UTC
version 18.2R1.9;
system {
root-authentication {
encrypted-password "xyz";
}
host-name VMX1;
services {
ssh {
root-login allow;
}
...

However, when i try to do the same from python, i found that i need to add empty leaf "config-text", otherwise the configuration is not returned.

I tried setting the leaf to "", but i get error that this element cannot be set.

How can i retrieve junos config from python ?

In [142]: action = device.rpc.jrpc__rpc_get_configuration.get_configuration

In [143]: input = action.get_input()

In [144]: input.config_text
Out[144]: Empty leaf name=config-text tag=249964986 cached=False

In [145]: print(action(input).configuration_text)
None

In [146]: input.config_text=''
---------------------------------------------------------------------------
MaagicError Traceback (most recent call last)
<ipython-input-146-9f18c6955582> in <module>
----> 1 input.config_text=''

/root/nso5.3/src/ncs/pyapi/ncs/maagic.py in __setattr__(self, name, value)
486 child.set_value(value)
487 else:
--> 488 raise MaagicError("Node type does not support assignment")
489 else:
490 raise MaagicError("Node has no attribute '%s'" % (name,))

MaagicError: Node type does not support assignment

In [147]:

[vleijon · Accepted solution]

For empty leafs you use the create() method.

[abdelseaudi]

Thanks!

Is there any way to filter the output for something like "show configuration protocols isis" only, instead of the full config ?

Or a way to retrieve the config in XML format, instead of free text ?

[vleijon]

This is an rpc towards the juniper device, so all formatting except for the xml part is done on the juniper side, nso only receives a string from the device. This means that any formatting options will depends on what is available in the rpc.