[Bug 2045756] Re: systemd-networkd-wait-online.service fails to complete if one of the network interfaces is not physically connected

[Heinrich Schuchardt]

The following files where created when installing the system:
/run/systemd/network/10-netplan-end0.network

[Match]
Name=end0

[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6

[DHCP]
RouteMetric=100
UseMTU=true

/run/systemd/network/10-netplan-end1.network
[Match]
Name=end1

[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6

[DHCP]
RouteMetric=100
UseMTU=true

Upstream recommends adding RequiredForOnline=no

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Title:
  systemd-networkd-wait-online.service fails to complete if one of the
  network interfaces is not physically connected

Status in netplan.io package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  My StarFive VisionFive 2 board has two network interfaces of which I
  have only connected one to a switch. The systemd-networkd-wait-
  online.service always fails delaying boot by 150 s. The problem does
  not occur if both network interfaces are physically connected.

  It does not make any sense to wait for the initialization of a network
  interface that is not physically connected.

  As described in
  https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net
  the physical link state can be determined via
  /sys/class/net/<iface>/carrier.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: systemd 253.5-1ubuntu7
  ProcVersionSignature: Ubuntu 6.5.0-9.9.1-generic 6.5.3
  Uname: Linux 6.5.0-9-generic riscv64
  ApportVersion: 2.27.0-0ubuntu6
  Architecture: riscv64
  CasperMD5json:
   {
     "result": "skip"
   }
  Date: Wed Dec  6 10:57:52 2023
  InstallationDate: Installed on 2023-12-04 (2 days ago)
  InstallationMedia: Ubuntu-Server 24.04 "Noble Numbat" - Daily riscv64 (20231204)
  Lspci-vt:
   -[0000:00]---00.0-[01]----00.0  VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller
   -[0001:00]---00.0-[01]----00.0  KIOXIA Corporation NVMe SSD Controller BG4 (DRAM-less)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Lsusb-t:
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
       |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=vt220
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.5.0-9-generic root=UUID=2ee109fa-e475-473e-a8da-79f18ec0c1a3 ro
  SourcePackage: systemd
  SystemdFailedUnits:
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  acpidump:

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