[Bug 1804721] [NEW] netplan try fails through to generic error handler when specifying bridge

[Peter Goodall]

Public bug reported:

Ubuntu 18.04.1 LTS, Release:    18.04

adding a specification for a bridge to /etc/netplan/01-my_network.yaml
causes a fail-over to a catch-all exception handler. No useful debugging
information is given. ( i wish you had markdown )

$ sudo netplan try -debug 
Error while loading /etc/netplan/01-my_network.yaml, aborting.

the source file has contents:

"
# Let netplan manage all devices on this system
network:
  version:        2
  renderer:       networkd
  ethernets:
    enp5s0:
      dhcp4:      yes
      dhcp6:      no

   bridges:
    lxdbr0:
      dhcp4:      yes
      interfaces:
        - enp5s0
"

It loads without error if the bridges section is removed. The file is a simple example from https://netplan.io/examples#bridging
I have tried several other configurations, all fail when bridging is attempted.

I believe the netplan source is at:
https://github.com/CanonicalLtd/netplan/blob/master/netplan/configmanager.py

I'm guessing the handler should not be activated.

        except (IOError, yaml.YAMLError):  # pragma: nocover (filesystem failures/invalid YAML)
            logging.error('Error while loading {}, aborting.'.format(yaml_file))
            sys.exit(1)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: netplan.io 0.40.1~18.04.2
ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
Uname: Linux 4.15.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 23 11:34:52 2018
InstallationDate: Installed on 2018-11-08 (14 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20181107)
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/usr/bin/zsh
SourcePackage: netplan.io
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic package-from-proposed third-party-packages

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https://bugs.launchpad.net/bugs/1804721

Title:
  netplan try fails through to generic error handler when specifying
  bridge

Status in netplan.io package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04.1 LTS, Release:    18.04

  adding a specification for a bridge to /etc/netplan/01-my_network.yaml
  causes a fail-over to a catch-all exception handler. No useful
  debugging information is given. ( i wish you had markdown )

  $ sudo netplan try -debug 
  Error while loading /etc/netplan/01-my_network.yaml, aborting.

  the source file has contents:

  "
  # Let netplan manage all devices on this system
  network:
    version:        2
    renderer:       networkd
    ethernets:
      enp5s0:
        dhcp4:      yes
        dhcp6:      no

     bridges:
      lxdbr0:
        dhcp4:      yes
        interfaces:
          - enp5s0
  "

  It loads without error if the bridges section is removed. The file is a simple example from https://netplan.io/examples#bridging
  I have tried several other configurations, all fail when bridging is attempted.

  I believe the netplan source is at:
  https://github.com/CanonicalLtd/netplan/blob/master/netplan/configmanager.py

  I'm guessing the handler should not be activated.

          except (IOError, yaml.YAMLError):  # pragma: nocover (filesystem failures/invalid YAML)
              logging.error('Error while loading {}, aborting.'.format(yaml_file))
              sys.exit(1)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: netplan.io 0.40.1~18.04.2
  ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
  Uname: Linux 4.15.0-42-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 23 11:34:52 2018
  InstallationDate: Installed on 2018-11-08 (14 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20181107)
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/usr/bin/zsh
  SourcePackage: netplan.io
  UpgradeStatus: No upgrade log present (probably fresh install)

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