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ssato / python-anyconfig

Python library provides common APIs to load and dump configuration files in various formats
MIT License
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Loading yaml files fails when using the yaml merge syntax with PyYAML #87

Closed idanov closed 6 years ago

idanov commented 6 years ago

Yaml supports syntax for merging arrays and dictionaries. The following yaml file can be successfully loaded by using PyYAML directly:

part1: &base
  a: hello
  b: world
  c:
    obj1: ','
    obj2: ['el1', 'el2']

part2:
  <<: *base
  b: solar system

However, when I use anyconfig to load the same file, I get an exception like this one:

...
...
...
  File "/usr/local/anaconda3/envs/test/lib/python3.5/site-packages/yaml/constructor.py", line 86, in construct_object
    data = constructor(self, node)
  File "/usr/local/anaconda3/envs/test/lib/python3.5/site-packages/anyconfig/backend/yaml.py", line 97, in construct_mapping
    key = loader.construct_object(key_node, deep=deep)
  File "/usr/local/anaconda3/envs/test/lib/python3.5/site-packages/yaml/constructor.py", line 86, in construct_object
    data = constructor(self, node)
  File "/usr/local/anaconda3/envs/test/lib/python3.5/site-packages/yaml/constructor.py", line 414, in construct_undefined
    node.start_mark)
yaml.constructor.ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:merge'
  in "example.yml", line 9, column 3

A quick search revealed that several other libraries had similar issues and apparently it is a quick fix to make this work: https://github.com/yaml/pyyaml/issues/64 https://github.com/saltstack/salt/issues/2092 https://github.com/google/rekall/issues/319 https://github.com/zerwes/hiyapyco/issues/7

ssato commented 6 years ago

Thanks a lot! I've just merged your PR. If something still goes wrong, please let me know.