[Bug 1752956] [NEW] netplan generate error message points to the wrong line number

[Ryan Harper]

Public bug reported:

1. 
root at b2:~# lsb_release -rd
Description:	Ubuntu Bionic Beaver (development branch)
Release:	18.04

root at b2:~# cat /etc/cloud/build.info 
build_name: server
serial: 20180224


2. 
root at b2:~# apt-cache policy nplan 
nplan:
  Installed: 0.33
  Candidate: 0.33
  Version table:
 *** 0.33 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

3. netplan generate detects invalid config, in error message reports the
line and column correctly to where the error was found.

4. netplan generate reports an error, but the location isn't accurate.


root at b2:~# cat /etc/netplan/50-cloud-init.yaml 
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            mtu: 1501
            addresses:
            - 2001:4800:78ff:1b:be76:4eff:fe06:96b3/64
    bridges:
        br0:
            addresses: []
            accept-ra: true


vlans:
  vlan.45:
     id: 45
     link: eth0

root at b2:~# netplan generate
Error in network definition //etc/netplan/50-cloud-init.yaml line 5 column 0: unknown key vlans

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nplan 0.33
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Fri Mar  2 18:51:49 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nplan (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug bionic third-party-packages uec-images

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https://bugs.launchpad.net/bugs/1752956

Title:
  netplan generate error message points to the wrong line number

Status in nplan package in Ubuntu:
  Confirmed

Bug description:
  1. 
  root at b2:~# lsb_release -rd
  Description:	Ubuntu Bionic Beaver (development branch)
  Release:	18.04

  root at b2:~# cat /etc/cloud/build.info 
  build_name: server
  serial: 20180224

  
  2. 
  root at b2:~# apt-cache policy nplan 
  nplan:
    Installed: 0.33
    Candidate: 0.33
    Version table:
   *** 0.33 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  3. netplan generate detects invalid config, in error message reports
  the line and column correctly to where the error was found.

  4. netplan generate reports an error, but the location isn't accurate.

  
  root at b2:~# cat /etc/netplan/50-cloud-init.yaml 
  # This file is generated from information provided by
  # the datasource.  Changes to it will not persist across an instance.
  # To disable cloud-init's network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      version: 2
      ethernets:
          eth0:
              dhcp4: true
              mtu: 1501
              addresses:
              - 2001:4800:78ff:1b:be76:4eff:fe06:96b3/64
      bridges:
          br0:
              addresses: []
              accept-ra: true

  
  vlans:
    vlan.45:
       id: 45
       link: eth0

  root at b2:~# netplan generate
  Error in network definition //etc/netplan/50-cloud-init.yaml line 5 column 0: unknown key vlans

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: nplan 0.33
  ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  Date: Fri Mar  2 18:51:49 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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