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buildDhallUrl: Respect proxy environment variables

`buildDhallUrl` is a fixed output derivation, which means
that we can (and should) inherit impure proxy-related
environment variables for fetching URLs.

The motivation for this change is:

https://discourse.dhall-lang.org/t/cant-build-a-nixified-dhall-package-in-a-sandbox-depending-on-the-environment/

… where a `buildDhallUrl` derivation was failing in a restricted
networking environment due to not inheriting proxy-related
settings.

Gabriella Gonzalez cb058dc7 a5051e29

options
unified split
Changed files
+2 -1
pkgs
development
interpreters
dhall
build-dhall-url.nix
+2 -1
pkgs/development/interpreters/dhall/build-dhall-url.nix 
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   sourceFile = "source.dhall";


     

       
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in


     

       
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-

       
  runCommand name { } (''


     

       

       
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  runCommand name { impureEnvVars = lib.fetchers.proxyImpureEnvVars; }


     

       

       
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 (''


     

       
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    set -eu


     

       
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    mkdir -p ${cacheDhall} $out/${cacheDhall}