Unverified Commit ebcece91 authored by Silvan Mosberger's avatar Silvan Mosberger Committed by GitHub
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Merge pull request #260087 from fricklerhandwerk/link-ifd 

link to documentation on IFD in the Nix manual
parents f7edf57b 61fa1255

doc/languages-frameworks/rust.section.md

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## Using community maintained Rust toolchains {#using-community-maintained-rust-toolchains}



::: {.note}

Note: The following projects cannot be used within nixpkgs since [IFD](#ssec-import-from-derivation) is disallowed.

The following projects cannot be used within Nixpkgs since [Import From Derivation](https://nixos.org/manual/nix/unstable/language/import-from-derivation) (IFD) is disallowed in Nixpkgs.

To package things that require Rust nightly, `RUSTC_BOOTSTRAP = true;` can sometimes be used as a hack.

:::

lib/fileset/README.md

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Arguments:

- (+) Such paths are usually produced by derivations, which means `toSource` would either:

  - Require IFD if `builtins.path` is used as the underlying primitive

  - Require [Import From Derivation](https://nixos.org/manual/nix/unstable/language/import-from-derivation) (IFD) if `builtins.path` is used as the underlying primitive

  - Require importing the entire `root` into the store such that derivations can be used to do the filtering

- (+) The convenient path coercion like `union ./foo ./bar` wouldn't work for absolute paths, requiring more verbose alternate interfaces:

  - `let root = "/nix/store/...-source"; in union "${root}/foo" "${root}/bar"`

pkgs/README.md

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### Import From Derivation



Import From Derivation (IFD) is disallowed in Nixpkgs for performance reasons:

[Hydra] evaluates the entire package set, and sequential builds during evaluation would increase evaluation times to become impractical.



[Hydra]: https://github.com/NixOS/hydra

[Import From Derivation](https://nixos.org/manual/nix/unstable/language/import-from-derivation) (IFD) is disallowed in Nixpkgs for performance reasons:

[Hydra](https://github.com/NixOS/hydra) evaluates the entire package set, and sequential builds during evaluation would increase evaluation times to become impractical.



Import From Derivation can be worked around in some cases by committing generated intermediate files to version control and reading those instead.



<!-- TODO: remove the following and link to Nix manual once https://github.com/NixOS/nix/pull/7332 is merged -->



See also [NixOS Wiki: Import From Derivation].



[NixOS Wiki: Import From Derivation]: https://nixos.wiki/wiki/Import_From_Derivation



## Sources



### Fetching Sources