netplan ifupdown-migrate fails to handle multi-field auto

[Mark Shuttleworth]

Saw this today on a server that acts as a router for me, so has quite a few bonded networks:

$ sudo netplan ifupdown-migrate
Expected 1 fields for stanza type auto but got 3

Will attach the relevant /e/n/interfaces for your debugging pleasure :)

[Mike Pontillo (mpontillo)]

I see that your `interfaces` file contains lines like:

    auto p2p2 inet manual
    auto p5p1 inet manual
    auto p5p2 inet manual

These should instead be:

    auto p2p2
    auto p5p1
    auto p5p2

It seems that ifupdown is less strict than netplan about what it accepts after "auto". (I guess it ignores arguments that aren't interface names; I vaguely remember using syntax such as "auto eth0 eth1", but I'm not positive that works.)

[Mark Shuttleworth (sabdfl)]

Thank you, yes, this appeared to clear the issue.

 status invalid

[Mark Shuttleworth (sabdfl)]

Perhaps the error message could have shown the offending line?

Something like this:

$ sudo netplan ifupdown-migrate
Expected 1 fields for stanza type auto but got 3, please check:
auto p1p2 inet manual

[Daniel Axtens (daxtens)]

/e/n/i does allow multiple interfaces on the one line for auto - per the man page - and netplan should support migrating that. I've added it to my list of migration bugs.