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ytt includes strict YAML subset mode that tries to remove any kind of ambiguity in user’s intent when parsing YAML.
Unlike full YAML, strict subset:
- only supports specifying nulls as "" or
- only supports specifying bools as
- only support basic int and float declarations
- prefix, suffix, octal notation, etc are not supported
- requires strings with whitespace to be explicitly quoted
- requires strings with colon to be explicitly quoted
- requires strings with triple-dash (document start) to be explicitly quoted
$ echo 'key: yes' | ytt -f- key: true
$ echo 'key: yes' | ytt -f- -s Error: Unmarshaling YAML template 'stdin.yml': yaml: Strict parsing: Found 'yes' ambigious (could be !!str or !!bool)
To fix error, explicitly make it a string:
$ echo 'key: "yes"' | ytt -f- -s key: "yes"
or via YAML tag
$ echo 'key: !!str yes' | ytt -f- -s key: "yes"
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