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62 lines
1.5 KiB
Markdown
62 lines
1.5 KiB
Markdown
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# Nix
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## Requirements
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- Install [Nix](https://nixos.org/download.html)
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- Enable Flakes [permanently](https://nixos.wiki/wiki/Flakes#Permanent)
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**For macOS users**
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Add the following lines to configuration file located at `/etc/nix/nix.conf`:
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```
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trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
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substituters = https://cache.iog.io https://cache.nixos.org
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```
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Restart the `nix-daemon` service:
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```
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sudo launchctl stop org.nixos.nix-daemon
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sudo launchctl start org.nixos.nix-daemon
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```
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If the following messages appear running the scripts detailed in the section
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below, it means that the Nix is not able to talk with the cache, in which case
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is recommended to go over the steps detailed in this section again:
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```
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warning: ignoring untrusted substituter 'https://cache.iog.io'
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```
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## Switching between different GHC versions
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The `bin` directory, holds all available shells:
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```
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ls bin | grep ghc
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```
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To spawn a new shell with a pre-defined GHC version, choose one of the scripts
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listed above and run the following command:
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```sh
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./bin/ghc90
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```
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Once inside the shell, verify the GHC version matches the script name:
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```
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ghc --version
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```
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After that, all commands detailed in the [Getting
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Started](../README.md#getting-started) section should work the same.
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Alternatively, to run a command without spawning a new shell use the `-c`
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option:
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```sh
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./bin/ghc90 -c <command>
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```
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