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Explain how to use `cache.dhall-lang.org` (#827) 

Related to #783
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Gabriel Gonzalez 2019-02-24 12:43:43 -08:00 committed by GitHub
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@ -31,7 +31,8 @@ Nix's channel mechanism by following the instructions at this link:
* [https://hydra.dhall-lang.org/jobset/dhall-haskell/master/channel/latest](https://hydra.dhall-lang.org/jobset/dhall-haskell/master/channel/latest)
If you want to directly install the latest build without a channel, you can
To install the Nix build products without a channel, configure your machine to
use `cache.dhall-lang.org`, as described in the [nix](#nix) section and then
visit one of the following links:
* [https://hydra.dhall-lang.org/job/dhall-haskell/master/linux-dhall/latest](https://hydra.dhall-lang.org/job/dhall-haskell/master/linux-dhall/latest)
@ -39,7 +40,7 @@ visit one of the following links:
* [https://hydra.dhall-lang.org/job/dhall-haskell/master/linux-dhall-json/latest](https://hydra.dhall-lang.org/job/dhall-haskell/master/linux-dhall-json/latest)
* [https://hydra.dhall-lang.org/job/dhall-haskell/master/linux-dhall-text/latest](https://hydra.dhall-lang.org/job/dhall-haskell/master/linux-dhall-text/latest)
... and then click the "Help" button in the bottom right corner, which will
You can then click the "Help" button in the bottom right corner, which will
show you a `nix-env` command that you can run to install the prebuilt
executable.
@ -81,6 +82,40 @@ $ cabal new-build dhall
### [nix](https://nixos.org/nix/)
You will probably want to use the shared cache hosted at `cache.dhall-lang.org`
when doing Nix development. This is not required, but this will save you a lot
of time so that you don't have to build as many dependencies from scratch the
first time.
If your operating system is NixOS then you can add the cache using these NixOS
configuration options:
```nix
nix = {
binaryCaches = [ "https://cache.nixos.org" "https://cache.dhall-lang.org" ];
binaryCachePublicKeys = [
"cache.dhall-lang.org:I9/H18WHd60olG5GsIjolp7CtepSgJmM2CsO813VTmM="
];
};
```
If you don't use NixOS but you do use Nix 2.0 or later, then set these options
in your `/etc/nix/nix.conf` file:
```
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= cache.dhall-lang.org:I9/H18WHd60olG5GsIjolp7CtepSgJmM2CsO813VTmM=
substituters = https://cache.nixos.org https://cache.dhall-lang.org
```
If you use an older version of Nix (i.e. Nix 1.*) then use these options
instead:
```
binary-cache-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= cache.dhall-lang.org:I9/H18WHd60olG5GsIjolp7CtepSgJmM2CsO813VTmM=
binary-caches = https://cache.nixos.org https://cache.dhall-lang.org
```
You can build all of the packages by running:
```console