YANG Reference Issue

[casbarre]

Hi everyone. 

After migrating NSO from version 4.7 to version 5.7, when I recompile some of the custom service packages, the following warning is shown:

yang/rsvp-te-tunnel.yang:224: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:224: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:224: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:224: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:243: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:243: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:243: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470
yang/rsvp-te-tunnel.yang:243: error: the node is config, but refers to a non-config node 'name' defined at /opt/ncs/current/src/ncs/yang/tailf-ncs-devices.yang:3470

I noticed that the mentioned YANG file lines that seem to display this warning, reference the device NED:

when "count(/ncs:devices/ncs:device[ncs:name=current()/../headend-router]/ncs:module[ncs:name='tailf-ned-cisco-ios']/ncs:name) != 0
              or count(/ncs:devices/ncs:device[ncs:name=current()/../headend-router]/ncs:module[ncs:name='tailf-ned-cisco-ios-xr']/ncs:name) != 0"

Does the service's Yang file's reference need to be updated to something else? 

Thank you in advance! 

[Nabsch · Accepted solution]

Hello,

I fixed the error that you get during the compilation phase by adding this flags 

--allow-interop-issues

       --allow-interop-issues
           Report YANG_ERR_XPATH_REF_BAD_CONFIG as a warning instead of an error. Be advised that this violates    RFC7950 section 6.4.1; a constraint on a config true node contains an XPath expression may not refer to a  config false node.

You will need to change your makefile 

../load-dir/%.fxs: yang/%.yang
        $(NCSC)  --allow-interop-issues  `ls $*-ann.yang  > /dev/null 2>&1 && echo "-a $*-ann.yang"` \
             $(NCSCPATH) -c -o $@ $<

Here what i got before the modification

nabil@DESKTOP-8ECTID4:~/ncs-run-5.8/packages/test-yang/src$ make clean all
rm -rf ../load-dir java/src//
mkdir -p ../load-dir
mkdir -p java/src//
/home/nabil/ncs-5.8/bin/ncsc  `ls test-yang-ann.yang  > /dev/null 2>&1 && echo "-a test-yang-ann.yang"` \
              -c -o ../load-dir/test-yang.fxs yang/test-yang.yang
yang/test-yang.yang:47: error: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
yang/test-yang.yang:47: error: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
yang/test-yang.yang:47: error: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
yang/test-yang.yang:47: error: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
make: *** [Makefile:25: ../load-dir/test-yang.fxs] Error 1

 Here after the modification

nabil@DESKTOP-8ECTID4:~/ncs-run-5.8/packages/test-yang/src$ make clean all
rm -rf ../load-dir java/src//
mkdir -p ../load-dir
mkdir -p java/src//
/home/nabil/ncs-5.8/bin/ncsc  --allow-interop-issues  `ls test-yang-ann.yang  > /dev/null 2>&1 && echo "-a test-yang-ann.yang"` \
              -c -o ../load-dir/test-yang.fxs yang/test-yang.yang
yang/test-yang.yang:47: warning: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
yang/test-yang.yang:47: warning: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
yang/test-yang.yang:47: warning: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513
yang/test-yang.yang:47: warning: the node is config, but refers to a non-config node 'name' defined at /home/nabil/ncs-5.8/src/ncs/yang/tailf-ncs-devices.yang:3513

[casbarre]

This fixed the issue. Thank you!