Conditional build behavior using netlify.toml & configuration variables?

Support
,
1

Hi!

I’m trying to find a way to condition my build using configuration variables. More precisely I want to copy either robots-production.txt or robots-dev.txt to robots.txt if the URL is equal to mysite.com. I want to avoid creating a special branch and since the url needs to be static using deploy preview is not an alternative.

Is it possible to achieve this using netlify.toml?

[???]
command = “mv robots-production.txt robots.txt”

[???]
command = “mv robots-dev.txt robots.txt”

Any suggestions on how to write the condition logic would be highly appreciated!

2

How are you checking for the URL?

In any case, I don’t think netlify.toml would help you here and you might have to write either a bash script, or a Node.js script to do what you need.

3

URL is listed under “Deploy URLs and metadata” in “Build environment variables” in the docs. That should give me access to the url in netlify.toml but I can’t figure out the syntax.

4

No but I still don’t understand, why would your URL be different across builds? Are you deploying 3 sites from the same repo?

5

Two different. One is production and the other is for Storyblok preview. The latter should not be indexed and therefore I need to use different robots.txt for the different builds. I could solve this by using a different branch for the preview, easy to set up in netlify.toml but I want to avoid this.

Does the “no” mean that I cannot access the URL variable in netlify.toml?

6

No need to check conditions then, just set a different build command for each site in your site settings instead of netlify.toml.

7

Perfect solution, thank you!

If anyone stumbles over this the build command would look something like this:

npm run generate && cp robots-dev.txt dist/robots.txt