To keep assumptions about pkgs.formats.yaml in tact we pin it to a format
that will emit YAML 1.1.
Future usage should specify the YAML version explicitly.
Previously, setting listsAsDuplicateKeys or listToValue would make it so
merging these treat all values as lists, by coercing non-lists via
lib.singleton. Some programs (such as gamemode; see #345121), allow some
values to be repeated but not others, which can lead to unexpected
behavior when non-list values are merged like this rather than throwing
an error.
This now makes that behavior opt-in via the mergeAsList option. Setting
mergeAsList (to either true or false) without setting either
listsAsDuplicateKeys or listToValue is an error, since lists are
meaningless in this case.
The new format is based on the existing wrapper and generates an INI file with an unnamed global section at the top as is used by *stunnel* for instance.
Technically the INI format is a subset of this however testing, type checking, and API guarantees profit from two separate generators.
Co-authored-by: tim-tx <tim-tx@users.noreply.github.com>
Signed-off-by: benaryorg <binary@benary.org>
The way `(lib.formats.yaml {}).generate` generates YAML is compliant
because on YAML 1.2 spec JSON is a subset of YAML but it bugs people's
minds and can lead to problems with software that is not compatible with
YAML 1.2.
This commit also changes the test of the generation function. Data
validation/typing remains the same.
See #133802.
Signed-off-by: lucasew <lucas59356@gmail.com>
