[Bug 1754508] Re: [next][queens] Horizon Errors out on first login or first access to a given dashboard unit: TypeError: coercing to Unicode: need string or buffer, NoneType found

[Liam Young]

Marking charm bug as invalid inlight of the packaging fix

** Changed in: charm-openstack-dashboard
       Status: In Progress => Invalid

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Title:
  [next][queens] Horizon Errors out on first login or first access to a
  given dashboard unit: TypeError: coercing to Unicode: need string or
  buffer, NoneType found

Status in OpenStack openstack-dashboard charm:
  Invalid
Status in heat-dashboard package in Ubuntu:
  Triaged

Bug description:
  bundle:
  https://paste.ubuntu.com/p/whdWff4KYy/

  I am getting "something went wrong" page periodically while using
  Horizon with Queens:

  https://paste.ubuntu.com/p/B8K8fv24RH/

  [Thu Mar 08 22:16:41.491638 2018] [wsgi:error] [pid 68565:tid 140145296692992] No handlers could be found for logger "neutron_lbaas_dashboard.dashboards.project.ngloadbalancersv2.panel"
  [Thu Mar 08 22:16:42.219735 2018] [wsgi:error] [pid 68563:tid 140145296692992] Internal Server Error: /identity/
  [Thu Mar 08 22:16:42.219772 2018] [wsgi:error] [pid 68563:tid 140145296692992] Traceback (most recent call last):
  [Thu Mar 08 22:16:42.219777 2018] [wsgi:error] [pid 68563:tid 140145296692992]   File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 132, in get_response
  ...

  [Thu Mar 08 22:16:42.219855 2018] [wsgi:error] [pid 68563:tid 140145296692992]     enforcer = _get_enforcer()
  [Thu Mar 08 22:16:42.219859 2018] [wsgi:error] [pid 68563:tid 140145296692992]   File "/usr/lib/python2.7/dist-packages/openstack_auth/policy.py", line 64, in _get_enforcer
  [Thu Mar 08 22:16:42.219863 2018] [wsgi:error] [pid 68563:tid 140145296692992]     if os.path.isfile(enforcer.policy_path):
  [Thu Mar 08 22:16:42.219877 2018] [wsgi:error] [pid 68563:tid 140145296692992]   File "/usr/lib/python2.7/genericpath.py", line 37, in isfile
  [Thu Mar 08 22:16:42.219882 2018] [wsgi:error] [pid 68563:tid 140145296692992]     st = os.stat(path)
  [Thu Mar 08 22:16:42.219885 2018] [wsgi:error] [pid 68563:tid 140145296692992] TypeError: coercing to Unicode: need string or buffer, NoneType found

  
  It seems painfully similar to this but with a different dashboard plugin: https://bugs.launchpad.net/charm-openstack-dashboard/+bug/1712617

  This is reproducible on a fresh installation and after any apache2
  restart.

  The reason is that heat_policy.json is not present in horizon's conf
  directory:

  # heat policy is not present in a conf dir
  root at juju-98ec86-6-lxd-8:~# locate heat_policy.json
  /usr/lib/python2.7/dist-packages/heat_dashboard/conf/heat_policy.json

  # again, nothing here
  root at juju-98ec86-6-lxd-8:~# ls /usr/share/openstack-dashboard/openstack_dashboard/conf/
  cinder_policy.d     glance_policy.json    keystonev3_policy.json  nova_policy.d
  cinder_policy.json  keystone_policy.json  neutron_policy.json     nova_policy.json

  root at juju-98ec86-6-lxd-8:~# grep -iP -A5 policy_files /etc/openstack-dashboard/local_settings.py
  #POLICY_FILES_PATH = os.path.join(ROOT_PATH, "conf")

  # Map of local copy of service policy files.
  # Please insure that your identity policy file matches the one being used on
  # your keystone servers. There is an alternate policy file that may be used
  # in the Keystone v3 multi-domain case, policy.v3cloudsample.json.
  --
  POLICY_FILES = {
      'identity': 'keystonev3_policy.json',
      'compute': 'nova_policy.json',
      'volume': 'cinder_policy.json',
      'image': 'glance_policy.json',
      'orchestration': 'heat_policy.json', # <--- this is a problem

  
  See this asciinema for a live demo 

  https://asciinema.org/a/QJwm8xRpULwZgLVx0DN3Vpa0u

  After heat_policy.json is commented out the exception disappears.

  This policy file needs to be present to make sure things work as
  expected.

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