what is meaning of def in this template?

[zffocussss]

is it a keyword,or just a custom literal?

golang/Dockerfile-linux.template

Line 2 in b738fe7

def is_alpine:

[dagood]

That file is a jq template, so that's https://jqlang.github.io/jq/manual/#defining-functions.

There are complications behind the scenes if you dig into https://github.com/docker-library/golang/blob/master/apply-templates.sh, but I've been able to work on a fork of this repo fine after realizing it was jq syntax.

(If anyone has docs that point out what these files really are in detail, I would like to know. I was never able to find anything.)

[tianon]

Documenting it better is on our (very long) TODO list, but https://github.com/docker-library/bashbrew/blob/f71d6ef63e1f5abe6d5cb06a62a3e5e42d68566e/scripts/jq-template.awk is the file that actually does the work. 😅

[dagood]

Aha, I was under the impression that the {{ and - logic was a mysterious part of jq (or part of awk), and the similarity to Go text/template meant I never needed to dig deeper to see where that comes from. Never noticed it's directly implemented by that file. 😄 Thanks. (I have that file checked into my fork to avoid the network dependency, so I had a chance to spot it!)

[tianon]

It's certainly extremely text/template inspired, so you weren't too far off! 😄