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settings: add removeReferencesTo
(#225)
This setting helps remove unnecessary dependencies to your haskell package that
bloats up the final closure size
Source: 5623bb3814/nix/removeReferencesTo.nix (L9)
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Co-authored-by: Sridhar Ratnakumar <3998+srid@users.noreply.github.com>
Co-authored-by: Sridhar Ratnakumar <srid@srid.ca>
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@ -3,6 +3,7 @@
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## Unreleased
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- #210: Add `extraLibraries` to `settings` module.
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- #225: settings: add `removeReferencesTo`
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- #215: Improved debug logging.
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- #216: Remove `debug` option (pass `--trace-verbose` to nix instead)
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- Fixes
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@ -46,7 +46,18 @@ haskellProjects.default = {
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## Custom settings {#custom}
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- [Emanote overrides](https://github.com/srid/emanote/commit/5b24bd04f94e03afe66ee01da723e4a05d854953): demonstrates how to add a *new* setting option (`removeReferencesTo`).
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You can provide custom settings for use in multiple packages (even across multiple repos). For example, see [this Emanote change](https://github.com/srid/emanote/commit/5b24bd04f94e03afe66ee01da723e4a05d854953) which demonstrates how to add a *new* setting option (`removeReferencesTo`).
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## Extra settings {#extra}
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haskell-flake provides the following settings on top of those provided by [nixpkgs].
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### `removeReferencesTo`
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Remove references to other packages from this Haskell package. This is useful to eliminate unnecessary data dependencies from your Haskell executable so as to reduce its closure size.
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> [!info] For more, see
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> - https://github.com/NixOS/nixpkgs/pull/204675
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> - https://srid.ca/remove-references-to
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[nixpkgs]: https://nixos.asia/en/nixpkgs
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@ -311,6 +311,28 @@ in
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impl = triggerRebuild;
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};
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removeReferencesTo = {
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type = types.listOf types.package;
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description = ''
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Packages to remove references to.
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This is useful to ditch unnecessary data dependencies from your Haskell
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executable so as to reduce its closure size.
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cf.
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- https://github.com/NixOS/nixpkgs/pull/204675
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- https://srid.ca/remove-references-to
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'';
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impl = disallowedReferences: drv:
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drv.overrideAttrs (old: rec {
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inherit disallowedReferences;
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postInstall = (old.postInstall or "") + ''
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${lib.concatStrings (map (e: "echo Removing reference to: ${e}\n") disallowedReferences)}
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${lib.concatStrings (map (e: "remove-references-to -t ${e} $out/bin/*\n") disallowedReferences)}
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'';
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});
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};
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# When none of the above settings is suitable:
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custom = {
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type = types.functionTo types.package;
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