Installation fails due to conflicting junos-eznc version

[NeolithEra]

Hi, users are unable to run nornir due to dependency conflict with junos-eznc package. As shown in the following full dependency graph of nornir, napalm requires junos-eznc ==2.2.1，while nornir requires junos-eznc >=2.2,<3.0.

According to pip’s “first found wins” installation strategy, junos-eznc 2.3.1 is the actually installed version. However, junos-eznc 2.3.1 does not satisfy ==2.2.1.

Dependency tree-----------

nornir - 2.3.0
| +- colorama(install version:0.4.3 version range:>=0.4.1,<0.5.0)
| +- jinja2(install version:2.10.3 version range:>=2,<3)
| | +- markupsafe(install version:1.1.1 version range:>=0.23)
| +- junos-eznc(install version:2.3.1 version range:>=2.2,<3.0)
| +- mypy_extensions(install version:0.4.3 version range:>=0.4.1,<0.5.0)
| +- napalm(install version:2.5.0 version range:>=2,<3)
| | +- cffi(install version:1.13.2 version range:>=1.11.3)
| | +- ciscoconfparse(install version:1.4.11 version range:*)
| | +- future(install version:0.18.2 version range:*)
| | +- jinja2(install version:2.10.3 version range:*)
| | | +- markupsafe(install version:1.1.1 version range:>=0.23)
| | +- junos-eznc(install version:2.2.1 version range:==2.2.1)
| | | +- jinja2(install version:2.10.3 version range:>=2.7.1)
| | | | +- markupsafe(install version:1.1.1 version range:>=0.23)
| | | +- lxml(install version:4.4.2 version range:>=3.2.4)
| | | +- ncclient(install version:0.6.6 version range:>=0.5.4)
| | | | +- lxml(install version:4.4.2 version range:>=3.3.0)
| | | | +- paramiko(install version:2.7.1 version range:>=1.15.0)
| | | | +- selectors2(install version:2.0.1 version range:>=2.0.1)
| | | | +- setuptools(install version:42.0.2 version range:>0.6)
| | | | +- six(install version:1.13.0 version range:*)
| | | +- netaddr(install version:0.7.19 version range:*)
| | | +- paramiko(install version:2.7.1 version range:>=1.15.2)
| | | +- pyserial(install version:3.4 version range:*)
| | | +- pyyaml(install version:5.2 version range:>=5.1)
| | | +- scp(install version:0.13.2 version range:>=0.7.0)
| | | | +- paramiko(install version:2.7.1 version range:*)
| | | +- six(install version:1.13.0 version range:*)
| | +- netaddr(install version:0.7.19 version range:*)
| | +- netmiko(install version:2.4.2 version range:==2.4.2)
| | | +- enum34(install version:1.1.6 version range:*)
| | | +- ipaddress(install version:1.0.23 version range:*)
| | | +- paramiko(install version:2.7.1 version range:>=2.4.3)
| | | +- pyserial(install version:3.4 version range:*)
| | | +- scp(install version:0.13.2 version range:>=0.13.2)
| | | | +- paramiko(install version:2.7.1 version range:*)
| | | +- setuptools(install version:42.0.2 version range:>=38.4.0)
| | | +- textfsm(install version:1.1.0 version range:*)
| | | | +- future(install version:0.18.2 version range:*)
| | | | +- six(install version:1.13.0 version range:*)
| | +- nxapi-plumbing(install version:0.5.2 version range:>=0.5.2)
| | | +- future(install version:0.18.2 version range:*)
| | | +- lxml(install version:4.4.2 version range:*)
| | | +- requests(install version:2.22.0 version range:>=2.7.0)
| | | | +- certifi(install version:2019.11.28 version range:>=2017.4.17)
| | | | +- chardet(install version:3.0.4 version range:<3.1.0,>=3.0.2)
| | | | +- idna(install version:2.8 version range:>=2.5,<2.9)
| | | | +- urllib3(install version:1.25.7 version range:<1.26,>=1.21.1)
| | | +- scp(install version:0.13.2 version range:*)
| | | | +- paramiko(install version:2.7.1 version range:*)
| | | +- six(install version:1.13.0 version range:*)
| | +- paramiko(install version:2.7.1 version range:>=2.4.2)
| | +- pyeapi(install version:0.8.2 version range:>=0.8.2)
| | | +- netaddr(install version:0.7.19 version range:*)
| | +- pyIOSXR(install version:0.53 version range:>=0.53)
| | | +- lxml(install version:4.4.2 version range:>=3.2.4)
| | | +- netmiko(install version:2.4.2 version range:>=1.4.3)
| | | | +- enum34(install version:1.1.6 version range:*)
| | | | +- ipaddress(install version:1.0.23 version range:*)
| | | | +- paramiko(install version:2.7.1 version range:>=2.4.3)
| | | | +- pyserial(install version:3.4 version range:*)
| | | | +- scp(install version:0.13.2 version range:>=0.13.2)
| | | | +- setuptools(install version:42.0.2 version range:>=38.4.0)
| | | | +- textfsm(install version:1.1.0 version range:*)
| | +- pyYAML(install version:5.2 version range:*)
| | +- scp(install version:0.13.2 version range:*)
| | | +- paramiko(install version:2.7.1 version range:*)
| | +- setuptools(install version:42.0.2 version range:>=38.4.0)
| | +- textfsm(install version:1.1.0 version range:*)
| | | +- future(install version:0.18.2 version range:*)
| | | +- six(install version:1.13.0 version range:*)
| +- ncclient(install version:0.6.6 version range:>=0.6.6,<0.7.0)
| | +- lxml(install version:4.4.2 version range:>=3.3.0)
| | +- paramiko(install version:2.7.1 version range:>=1.15.0)
| | +- selectors2(install version:2.0.1 version range:>=2.0.1)
| | +- setuptools(install version:42.0.2 version range:>0.6)
| | +- six(install version:1.13.0 version range:*)
| +- netmiko(install version:2.4.2 version range:>=2.3.3,<3.0.0)
| | +- enum34(install version:1.1.6 version range:*)
| | +- ipaddress(install version:1.0.23 version range:*)
| | +- paramiko(install version:2.7.1 version range:>=2.4.3)
| | +- pyserial(install version:3.4 version range:*)
| | +- scp(install version:0.13.2 version range:>=0.13.2)
| | | +- paramiko(install version:2.7.1 version range:*)
| | +- setuptools(install version:42.0.2 version range:>=38.4.0)
| | +- textfsm(install version:1.1.0 version range:*)
| | | +- future(install version:0.18.2 version range:*)
| | | +- six(install version:1.13.0 version range:*)
| +- paramiko(install version:2.7.1 version range:>=2.1.1,<3.0.0)
| +- pydantic(install version:0.18.2 version range:>=0.18.2,<0.19.0)
| | +- dataclasses(install version:0.7 version range:>=0.6)
| +- requests(install version:2.22.0 version range:>=2,<3)
| | +- certifi(install version:2019.11.28 version range:>=2017.4.17)
| | +- chardet(install version:3.0.4 version range:<3.1.0,>=3.0.2)
| | +- idna(install version:2.8 version range:>=2.5,<2.9)
| | +- urllib3(install version:1.25.7 version range:<1.26,>=1.21.1)
| +- ruamel.yaml(install version:0.15.100 version range:>=0.15.85,<0.16.0)
| +- typing_extensions(install version:3.7.4.1 version range:>=3.7,<4.0)

Thanks for your help.
Best,
Neolith

[NeolithEra]

Suggested Solution

1. Ask your upstream project napalmto loose the version range of junos-eznc.
2. Remove your direct dependency junos-eznc, and use junos-eznc transitively introduced by napalm.

@dbarrosop Which solution do you prefer, 1 or 2?
Please let me know your choice. I can submit a PR to solve this issue.

[ktbyers]

I think we should do 2 i.e. remove the direct dependency on junos-eznc and pull it in via NAPALM.

The other option is to pin the direct dependency to 2.2.1.

The cause was a change that PyEZ library made that broke napalm tests--it is only a testing issue and not a real issue (i.e. we mocked a PyEZ connection and are now missing a needed attribute in napalm).

The issue will be fixed in the next NAPALM release. Though we will have to roll Nornir pyproject.toml for that anyways as it will be NAPALM 3.X.X.

[dmfigol]

if we don't directly use junos-eznc, then it should not be in our direct dependency list.
I agree with @ktbyers

[dbarrosop]

Thanks a lot for reporting the issue and for the extensive analysis and proposed solutions. I concur with Kirk and Dimitri, I think removing the direct dependency is the best solution.

[NeolithEra]

@dbarrosop @dmfigol @ktbyers, Thanks for your quick feedback. I will submit a PR to solve this problem. :-P