nm-keyfile generator can produce invalid "interface-name=..." setting

[Lukas Märdian]

netplan.io v0.102 can produce an invalid keyfile "connection.interface-name" setting, especially when using passthrough mode (i.e. type = NETPLAN_DEF_TYPE_NM).

The value of "interface-name=NM-3599eff2-e438-46d0-8e34-ac38fbd63688" is an invalid interface-name (too long) and the connection profile is thus ignored by NetworkManager.

$ cat /etc/netplan/NM-3599eff2-e438-46d0-8e34-ac38fbd63688.yaml
network:
  version: 2
  ethernets:
    NM-3599eff2-e438-46d0-8e34-ac38fbd63688:
      renderer: NetworkManager
      wakeonlan: true
      networkmanager:
        uuid: 3599eff2-e438-46d0-8e34-ac38fbd63688
        name: "mycon2"
        passthrough:
          connection.permissions: ""
          ethernet.mac-address-blacklist: ""
          ipv4.dns-search: ""
          ipv4.method: "auto"
          ipv6.addr-gen-mode: "stable-privacy"
          ipv6.dns-search: ""
          ipv6.method: "auto"
          proxy._: ""

$ cat /run/NetworkManager/system-connections/netplan-NM-3599eff2-e438-46d0-8e34-ac38fbd63688.nmconnection
[connection]
id=mycon2
type=ethernet
uuid=3599eff2-e438-46d0-8e34-ac38fbd63688
interface-name=NM-3599eff2-e438-46d0-8e34-ac38fbd63688
#Netplan: passthrough setting
permissions=

[ethernet]
wake-on-lan=1
#Netplan: passthrough setting
mac-address-blacklist=

[ipv4]
#Netplan: passthrough override
method=auto
#Netplan: passthrough setting
dns-search=

[ipv6]
#Netplan: passthrough override
method=auto
#Netplan: passthrough setting
addr-gen-mode=stable-privacy
#Netplan: passthrough setting
dns-search=

[proxy]

[Lukas Märdian (slyon)]

This should be fixed as of netplan v0.103, especially for logical/virtual network interfaces (bridges, bonds, vlans, ...).
Some more testing is needed to verify all the edge cases.

[Lukas Märdian (slyon)]

Seems to be fixed, please re-open if there are any related issues.