Flakes: Difference between revisions

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== Using flakes project from a legacy Nix ==

There is a [https://github.com/edolstra/flake-compat flake-compat] library you can use to shim legacy <code>default.nix</code> and <code>shell.nix</code> files. It will download the inputs of the flake, pass them to the flake’s <code>outputs</code> function and return an attribute set containing <code>defaultNix</code> and <code>shellNix</code> attributes. The attributes will contain the output attribute set with an extra <code>default</code> attribute pointing to current platform’s <code>defaultPackage</code> (resp. <code>devShell</code> for <code>shellNix</code>).

If you want to use a flake from a 'regular' derivation on a system that does have flakes enabled, you can use something like `(builtins.getFlake "path:/path/to/directory").packages.x86_64-linux.default`, where 'directory' is the directory that contains your `flake.nix`.

There is also a [https://github.com/edolstra/flake-compat flake-compat] library you can use to shim legacy <code>default.nix</code> and <code>shell.nix</code> files. It will download the inputs of the flake, pass them to the flake’s <code>outputs</code> function and return an attribute set containing <code>defaultNix</code> and <code>shellNix</code> attributes. The attributes will contain the output attribute set with an extra <code>default</code> attribute pointing to current platform’s <code>defaultPackage</code> (resp. <code>devShell</code> for <code>shellNix</code>).

Place the following into <code>default.nix</code> (for <code>shell.nix</code>, replace <code>defaultNix</code> with <code>shellNix</code>) to use the shim:

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 == Using flakes project from a legacy Nix ==
-There is a [https://github.com/edolstra/flake-compat flake-compat] library you can use to shim legacy <code>default.nix</code> and <code>shell.nix</code> files. It will download the inputs of the flake, pass them to the flake’s <code>outputs</code> function and return an attribute set containing <code>defaultNix</code> and <code>shellNix</code> attributes. The attributes will contain the output attribute set with an extra <code>default</code> attribute pointing to current platform’s <code>defaultPackage</code> (resp. <code>devShell</code> for <code>shellNix</code>).
+If you want to use a flake from a 'regular' derivation on a system that does have flakes enabled, you can use something like `(builtins.getFlake "path:/path/to/directory").packages.x86_64-linux.default`, where 'directory' is the directory that contains your `flake.nix`.
+There is also a [https://github.com/edolstra/flake-compat flake-compat] library you can use to shim legacy <code>default.nix</code> and <code>shell.nix</code> files. It will download the inputs of the flake, pass them to the flake’s <code>outputs</code> function and return an attribute set containing <code>defaultNix</code> and <code>shellNix</code> attributes. The attributes will contain the output attribute set with an extra <code>default</code> attribute pointing to current platform’s <code>defaultPackage</code> (resp. <code>devShell</code> for <code>shellNix</code>).
 Place the following into <code>default.nix</code> (for <code>shell.nix</code>, replace <code>defaultNix</code> with <code>shellNix</code>) to use the shim: