Modulehorizon-config-shell-0.12.1GHC2024

Horizon.Config.Prune

What a package set must carry: the declared roots and everything they reach through the generated derivations. A declaration outside that closure is a pin nothing needs.

The dependency graph is read from the nix horizon-gen-nix wrote (pkgs/NAME.nix), not from cabal files: a cabal2nix derivation's argument set is every Haskell dependency of every component — library, executables, tests, benchmarks, setup and build tools — so a package kept only for another package's test suite still counts as reached, as it must while the set builds with checks on.

1 type
4 values

Packagehorizon-config-shell-0.12.1
Exports5
LanguageGHC2024
LicenceBSD-3-Clause
SourcePrune.hs

datadata Report

Constructors

Report
- reportDeclared :: Int
- reportReached :: Int
- reportRoots :: [Text]
- reportFromBase :: [Text]
  Roots the config does not declare: they come from the base set, so they are kept but not walked.
- reportUngenerated :: [Text]
  Declared packages with no generated derivation: regenerate first.
- reportUnreachable :: [Text]
  Generated packages no root reaches.

Instances2Eq, Show

Eq ReportDefined in horizon-config-shell-0.12.1 · Horizon.Config.Prune
Show ReportDefined in horizon-config-shell-0.12.1 · Horizon.Config.Prune

valueprune :: FilePath -> [Text] -> [Text] -> IO Report

Walk from the roots over the derivations under dir (the export's pkgs directory), restricted to the declared packages.

valuederivationArgs :: Text -> Set Text

The formal arguments of a generated derivation: the names between its opening { and the }: that closes the argument set. Besides Haskell packages these include mkDerivation, lib, fetchers and system libraries; closure only follows the declared names.

valueclosure :: Map Text (Set Text) -> [Text] -> Set Text

Everything reachable from the roots, the roots included.

valuerenderReport :: Report -> Text