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< h1 id = "overrides" > < a class = "header" href = "#overrides" > Overrides< / a > < / h1 >
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< p > By default, the NixOS systems are based on the latest release. While it is
trivial to change this to nixos-unstable or any other branch of nixpkgs by
changing the flake url, sometimes all we want is a single package from another
branch.< / p >
< p > This is what the overrides are for. By default, they are pulled directly from
nixpkgs/master, but you can change the < code > override< / code > flake input url to
nixos-unstable, or even a specific sha revision.< / p >
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< h2 id = "example" > < a class = "header" href = "#example" > Example< / a > < / h2 >
< h3 id = "packages" > < a class = "header" href = "#packages" > Packages< / a > < / h3 >
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< p > The override packages are defined as a regular overlay with an extra arguement
< code > pkgs< / code > . This refers to the packages built from the < code > override< / code > flake.< / p >
< p > Pulling the manix package from the override flake:< / p >
< pre > < code class = "language-nix" > {
packages = pkgs: final: prev: {
inherit (pkgs) manix;
};
}
< / code > < / pre >
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< h3 id = "modules" > < a class = "header" href = "#modules" > Modules< / a > < / h3 >
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< p > You can also pull modules from override. Simply specify their path relative to
the nixpkgs < a href = "https://github.com/NixOS/nixpkgs/tree/master/nixos/modules" > modules< / a > directory. The old version will be added
to < code > disabledModules< / code > and the new version imported into the configuration.< / p >
< p > Pulling the zsh module from the override flake:< / p >
< pre > < code class = "language-nix" > {
modules = [ " programs/zsh/zsh.nix" ];
}
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< / code > < / pre >
< blockquote >
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< h5 id = "note" > < a class = "header" href = "#note" > < em > Note:< / em > < / a > < / h5 >
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< p > Sometimes a modules name will change from one branch to another. This is what
the < code > disabledModules< / code > list is for. If the module name changes, the old
version will not automatically be disabled, so simply put it's old name in
this list to disable it.< / p >
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