[Bug 1914100] Re: python3-heat-dashboard launch stack fails

[Heather Lemon]

** Changed in: heat-dashboard (Ubuntu Bionic)
     Assignee: Heather Lemon (hypothetical-lemon) => (unassigned)

** No longer affects: heat-dashboard (Ubuntu Bionic)

** Changed in: heat-dashboard (Ubuntu)
       Status: New => Invalid

** Changed in: cloud-archive
       Status: New => Invalid

** Changed in: cloud-archive/stein
       Status: New => In Progress

** Changed in: cloud-archive/stein
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1914100

Title:
  python3-heat-dashboard launch stack fails

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive stein series:
  In Progress
Status in heat-dashboard package in Ubuntu:
  Invalid

Bug description:
  Heat-dashboard fails to upload files.

  [Impact]

  Users cannot upload heat template files via the Openstack dashboard
  (see failed ui screenshot)

  "A template is used to automate the deployment of infrastructure,
  services, and applications."

  [Test Case]

  1) Setup a basic openstack with heat and horizon
  - generate a heat-template.yaml deployment (attached template.yaml)
  2) After the regular cloud setup, try to upload the file via horizon dashboard -> Project -> Stacks -> Launch stack (+)
  - choose the template.yaml
  3) Check openstack-dashboard /var/log/apache2/error.log and it should have the error
  ```
  [Mon Feb 01 19:46:05.787127 2021] [wsgi:error] [pid 13984:tid 140255296943872] [remote 10.5.3.109:59180]   File "/usr/lib/python3/dist-packages/heat_dashboard/content/stacks/forms.py", line 149, in clean
  [Mon Feb 01 19:46:05.787129 2021] [wsgi:error] [pid 13984:tid 140255296943872] [remote 10.5.3.109:59180]     self.clean_uploaded_files('template', _('template'), cleaned, files)
  [Mon Feb 01 19:46:05.787132 2021] [wsgi:error] [pid 13984:tid 140255296943872] [remote 10.5.3.109:59180]   File "/usr/lib/python3/dist-packages/heat_dashboard/content/stacks/forms.py", line 207, in clean_uploaded_files
  [Mon Feb 01 19:46:05.787135 2021] [wsgi:error] [pid 13984:tid 140255296943872] [remote 10.5.3.109:59180]     if tpl.startswith('{'):
  [Mon Feb 01 19:46:05.787139 2021] [wsgi:error] [pid 13984:tid 140255296943872] [remote 10.5.3.109:59180] TypeError: startswith first arg must be bytes or a tuple of bytes, not str
  [Mon Feb 01 19:46:05.787145 2021] [wsgi:error] [pid 13984:tid 140255296943872] [remote 10.5.3.109:59180] 
  ```

  [Where problems could occur]

  The information for the forms page could fail to load properly.

  [Other Info]

  Openstack: Stein
  OS: Ubuntu Bionic

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