[Cloud-packages] Bug#814469: bootstrap-vz runs into a TypeError on Jessie

[kellerfuchs]

Package: bootstrap-vz
Version: 0.9.0-1
Severity: important

Dear Maintainer,

bootstrap-vz throws a TypeError on jessie while trying to build an image.
The version from git (commit 790f2d66bba2eaff5dddc57a84d388e7dd45ed55) works
  without any issue.

I'm not writing from the system I encountered the problem on, hence the
  deletion of the system information;  the enclosed info should be enough
  to localise the problem.


> sudo bootstrap-vz ebs-jessie-amd64-hvm.yml                                                                                                     

Traceback (most recent call last):
  File "/usr/local/bin/bootstrap-vz", line 9, in <module>
    load_entry_point('bootstrap-vz==0.9.0', 'console_scripts', 'bootstrap-vz')()
  File "/usr/local/lib/python2.7/dist-packages/bootstrapvz/base/main.py", line 33, in main
    run(opts)
  File "/usr/local/lib/python2.7/dist-packages/bootstrapvz/base/main.py", line 63, in run
    manifest = Manifest(opts['MANIFEST'])
  File "/usr/local/lib/python2.7/dist-packages/bootstrapvz/base/manifest.py", line 24, in __init__
    self.load()
  File "/usr/local/lib/python2.7/dist-packages/bootstrapvz/base/manifest.py", line 42, in load
    provider_modname = 'bootstrapvz.providers.' + self.data['provider']
TypeError: cannot concatenate 'str' and 'dict' objects


> cat ebs-jessie-amd64-hvm.yml

---
name: debian-{system.release}-{system.architecture}-{provider.virtualization}-{%Y}-{%m}-{%d}-ebs
provider:
  name: ec2
  virtualization: hvm
  enhanced_networking: simple
  description: Debian {system.release} {system.architecture}
bootstrapper:
  workspace: /target
  tarball: true
  sources:
    docker:
      - deb https://apt.dockerproject.org/repo debian-jessie main
  include_packages:
    - apt-transport-https
    - ca-certificates
    - docker-engine
  trusted_keys:
    - keys/docker.asc
system:
  release: jessie
  architecture: amd64
  bootloader: extlinux
  charmap: UTF-8
  locale: en_US
  timezone: UTC
volume:
  backing: ebs
  partitions:
    type: none
    root:
      filesystem: ext4
      size: 8GiB
packages:
  mirror: http://cloudfront.debian.net/debian
plugins:
  cloud_init:
    metadata_sources: Ec2
    username: admin