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Beam/Elixir: Add section on using an overlay (#153348)

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* Beam/Elixir: Add section on using an overlay
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Erlend Hamberg 2022-01-03 23:10:25 +01:00 committed by GitHub
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doc/languages-frameworks/beam.section.md
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@ -280,6 +280,30 @@ mkShell {
}
```
### Using an overlay
If you need to use an overlay to change some attributes of a derivation, e.g. if you need a bugfix from a version that is not yet available in nixpkgs, you can override attributes such as `version` (and the corresponding `sha256`) and then use this overlay in your development environment:
#### `shell.nix`
```nix
let
elixir_1_13_1_overlay = (self: super: {
elixir_1_13 = super.elixir_1_13.override {
version = "1.13.1";
sha256 = "0z0b1w2vvw4vsnb99779c2jgn9bgslg7b1pmd9vlbv02nza9qj5p";
};
});
pkgs = import <nixpkgs> { overlays = [ elixir_1_13_1_overlay ]; };
in
with pkgs;
mkShell {
buildInputs = [
elixir_1_13
];
}
```
#### Elixir - Phoenix project {#elixir---phoenix-project}
Here is an example `shell.nix`.