Specifying NetworkManager renderer per-interface doesn't work for ethernet interfaces

[Daniel Axtens]

I tried to use NetworkManager with the following file:

network:
    version: 2
    ethernets:
        eth0:
           renderer: NetworkManager
           addresses: ["fd8f:1d7d:b141::3/64"]
           gateway6: "fd8f:1d7d:b141::1"
           nameservers:
               addresses: ["fd8f:1d7d:b140::1"]

It didn't work. nmcli reported that eth0 was 'unmanaged'.

The following file did work - moving NetworkManager to global scope:

network:
    version: 2
    renderer: NetworkManager
    ethernets:
        eth0:
           addresses: ["fd8f:1d7d:b141::3/64"]
           gateway6: "fd8f:1d7d:b141::1"
           nameservers:
               addresses: ["fd8f:1d7d:b140::1"]

I think this is due to the following in generate.c:

    /* Disable /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf
     * (which restricts NM to wifi and wwan) if global renderer is NM */
    if (get_global_backend() == BACKEND_NM)
        g_string_free_to_file(g_string_new(NULL), rootdir, "/run/NetworkManager/conf.d/10-globally-managed-devices.conf", NULL);

I think it needs to write a file if there is *any* NM interface, not just if the global backend is NM.

[Daniel Axtens (daxtens)]

PR Proposed: https://github.com/CanonicalLtd/netplan/pull/40