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Update source/tutorials/file-sets.md

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Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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Silvan Mosberger 2023-11-23 15:58:44 +01:00 committed by GitHub
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@ -6,12 +6,8 @@ Also use https://nixos.org/manual/nixpkgs/unstable/#sec-functions-library-filese
instead of https://nixos.org/manual/nixpkgs/unstable/#sec-fileset
-->
To build a local project in a Nix derivation,
its source files must be accessible
to the [derivation builder](https://nixos.org/manual/nix/stable/language/derivations#attr-builder).
Since by default, derivations get built in an [isolated environment](https://nixos.org/manual/nix/stable/command-ref/conf-file.html#conf-sandbox)
that only allows reading from the Nix store,
the Nix language has built-in features to copy local files to the store and expose the resulting store paths.
To build a local project in a Nix derivation, source files must be accessible to its [`builder` executable](https://nixos.org/manual/nix/stable/language/derivations#attr-builder).
Since by default, the `builder` runs in an [isolated environment](https://nixos.org/manual/nix/stable/command-ref/conf-file.html#conf-sandbox) that only allows reading from the Nix store, the Nix language has built-in features to copy local files to the store and expose the resulting store paths.
Using these features directly can be tricky however: