Leaf in when constraint not found in combination with augment and choice/case

[verthezpw]

See the following example model, which I minimized as far as possible from the case we encounter:
example.zip

pyang gives the following warning for this:
example.yang:30: warning: node "example::type" is not found in "example::inline-frame-processing"

This is occurring in 2.3.0, and also already in 2.2.1, but not in 1.7.5.

Note that it succeeds if:

• you switch the order of the augments at the end of the file -> but this should not depend on this order
• or if you remove the choice/case levels from the last augment (the when constraint stays the same) -> so this is related to choice/case handling

[fredgan]

Hi, It's a known issue since xpath parser added. XPath parser was added in 1755bf1 a bit earlier than version 2.0

[hyberdk]

hi @fredgan / @mbj4668

do you know if this is something that are being addressed? I think this one is my show stopper for compiling the Cisco native models. Its related to #729 and #836

I know the Cisco yang models are fairly buggy, but I have been going though the problems one-by-one and I have a working set of yang models. At least according to libyang (yanglint).

But this is blocking me for compiling the models. Like the others I am getting a ton of these faults

Cisco-IOS-XE-interfaces.yang:3231: error: "Cisco-IOS-XE-interfaces:native" in the path for AppNav-Compress at Cisco-IOS-XE-bgp.yang:12237 (at Cisco-IOS-XE-interfaces.yang:3227) is not found
Cisco-IOS-XE-interfaces.yang:3231: error: "Cisco-IOS-XE-interfaces:native" in the path for AppNav-Compress at Cisco-IOS-XE-bgp.yang:12237 (at Cisco-IOS-XE-interfaces.yang:3227) is not found
Cisco-IOS-XE-interfaces.yang:3231: error: "Cisco-IOS-XE-interfaces:native" in the path for AppNav-Compress at Cisco-IOS-XE-bgp.yang:12237 (at Cisco-IOS-XE-interfaces.yang:3227) is not found
Cisco-IOS-XE-interfaces.yang:3231: error: "Cisco-IOS-XE-interfaces:native" in the path for AppNav-Compress at Cisco-IOS-XE-bgp.yang:12237 (at Cisco-IOS-XE-interfaces.yang:3227) is not found
Cisco-IOS-XE-interfaces.yang:3231: error: "Cisco-IOS-XE-interfaces:native" in the path for AppNav-Compress at Cisco-IOS-XE-bgp.yang:12237 (at Cisco-IOS-XE-interfaces.yang:3227) is not found

Im pretty sure its this problem as its augments the interfaces in the Cisco-IOS-XE-bgp.yang from the native model and its also using choices..

What can I do to help this along?

Esben

[mbj4668]

@hyberdk please verify this fix on the modules you have.

[hyberdk]

Hi @mbj4668,

thank you so much for your feedback! I tested it again, but unfortunately my model is still failing with the same fault.

I have been stepping through the code and I am not too sure, but looking at this:

In line 2757 i searches for the "ptr" (is that pointer?), it does not find any as there are no children in the pmodule. This sets ptr = None.

In line 2762 it searches for includes again

but, since its searching in the "Cisco-IOS-XE-interfaces" submodule, there are no "includes" there.. I think the problem is that the reference to /native/interface/* are in the upstream native module, but it does not search that one only the sub-module..

From what I can tell, we need to instruct pyang that if the current module is a "sub-module" it needs to include the "belongs-to" module in the search and not only the submodule and its includes..

does that make sense?

I will try and clean up the models a bit and push it to my github so you can test with the same files.. I have tried to make a test-case but I have not been able to do so yet.. ;-(

but again, many many thanks for reaching out.. I have been stuck on this for months now..

Esben

[mbj4668]

See my comment in #729 as well. The XE models are "broken" in the sense that they don't follow the scoping rules for YANG 1.

I just pushed another fix to the branch mbj/submodules-xpath. You can test that one with the modules you have - but note that your modules and submodules must have yang-version 1.1.