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

[Michael Vogt]

Public bug reported:

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)

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- As part of our ubuntu core integration testing we run the spread test
- for netplan on a PI device.
+ 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) : 
+ 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
-     }
-   }
+   "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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https://bugs.launchpad.net/bugs/1967084

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

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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