[Bug 1967084] Re: netplan dbus returns "false" in io.netplan.Netplan.Config.Set

[Michael Vogt]

It's pretty consistent now, here is a strace log from uc20 in google
that shows the calls from dbus: https://paste.ubuntu.com/p/hmjDQYYc9S/

** Also affects: netplan
   Importance: Undecided
       Status: New

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Title:
  netplan dbus returns "false" in io.netplan.Netplan.Config.Set

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

Bug description:
  As part of our snapd core integration testing we run the spread test
  for netplan on a UC20 PI device.

  On this device our test fails with:
  """
  2022-03-25 14:33:00 Error executing external:ubuntu-core-20-arm-32:tests/core/netplan-cfg (external:ubuntu-core-20-arm-32) :
  -----
  + echo 'Getting version works'
  Getting version works
  + snap get system system.network.netplan.network.version
  + MATCH '^2$'
  + echo 'Getting the full document works and it is valid json'
  Getting the full document works and it is valid json
  + jq .
  + snap get -d system system.network.netplan
  {
    "system.network.netplan": {
      "network": {
        "ethernets": {
          "eth0": {
            "dhcp4": true,
            "match": {
              "macaddress": "b8:27:eb:41:42:43"
            },
            "set-name": "eth0"
          }
        },
        "version": 2
      }
    }
  }
  + echo 'Check that setting adding a br54 interface via netplan works'
  Check that setting adding a br54 interface via netplan works
  + snap set system system.network.netplan.network.bridges.br54.dhcp4=true
  error: cannot perform the following tasks:
  - Run configure hook of "core" snap (run hook "configure": cannot try netplan config: no specific reason returned from netplan)
  -----
  """

  This error means that snapd called io.netplan.Netplan.Config.Set and
  got a "false" without an error from that call (c.f.
  https://github.com/snapcore/snapd/blob/master/overlord/configstate/configcore/netplan.go#L218)

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