Terragrunt: Add support for basic interpolation functions
At the very least it would be very helpful to be able to use these functions inside terragrunt configurations:
See also - https://www.terraform.io/docs/configuration/interpolation.html
antonbabenko
All 5 comments
Agreed, but building them one at a time seems like a never-ending battle.
Thought experiment: is there a way to reuse Terraform's interpolation engine to get all of the functions it supports "for free"?
brikis98
on 15 Feb 2018
Yes, this should be possible from what I see in their code. Not sure about licensing or copyrights though. Do you have experience with it?
antonbabenko
on 15 Feb 2018
Terraform uses the Mozilla License. AFAIK, that means any changes we make to that source code would have to be open sourced as well. However, we're not making changes to Terraform's code, we're just using it as a library in our code, which should be fine. Moreover, Terragrunt is open source already :)
brikis98
on 15 Feb 2018
As of https://github.com/gruntwork-io/terragrunt/releases/tag/v0.19.0, we use the HCL2 parser, which has native support for built-in functions, and even ships with a collection of them. It should be straightforward to add support for all of these now if someone wants to submit a PR.
brikis98
on 10 Jun 2019
As of v0.19.4, all Terraform built-in functions are now supported.
brikis98
on 16 Jun 2019
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Most helpful comment
Terraform uses the Mozilla License. AFAIK, that means any changes we make to that source code would have to be open sourced as well. However, we're not making changes to Terraform's code, we're just using it as a library in our code, which should be fine. Moreover, Terragrunt is open source already :)