Importing external YAML files

[alexec]

I'm currently using JK to template manifests, but I'd like to know if I can do the same thing with Jsonnet instead.

The manifests basically loop over the contents on an array stored in a YAML file.

Can you tell me how to read that YAML file from disk please?

I can't find this use case in the docs.

[sparkprime]

YAML has many incompatible implementations which is why it was never included.  There is an incomplete effort to add std.parseYaml() to go-jsonnet which uses the Go YAML implementation which people think is pretty decent. google/go-jsonnet#339

However why use YAML for your list instead of JSON or (if you need it) Jsonnet? Then you can just use import.  If you do need to use YAML for some reason, you could always convert it using a 3rd party tool into JSON and then use jsonnetfmt to turn it into Jsonnet (there is even a page on the website that will do that for Kubernetes manifests).

[sbarzowski]

For completeness: you can import any file with importstr. But then you probably need to parse it, and we don't currently have a YAML parser. The best way is to preprocess the file before feeding it to Jsonnet.

[alexec]

I could easily use JSON - is that possible?

[sparkprime]

Yes, JSON is a subset of Jsonnet, so import it like Jsonnet.

[alexec]

simple

local clusters = import 'data/cluster-configs.json';
std.map(function(c) {
     name:c.name
},clusters)

maybe docs could be better on this topic?

[sparkprime]

The tutorial does mention it:

It's possible to import both code and raw data from other files.

• The import construct is like copy/pasting Jsonnet code.
• Files designed for import by convention end with .libsonnet
• Raw JSON can be imported this way too.
• The importstr construct is for verbatim UTF-8 text.