Moduledistribution-nixpkgs-1.7.1.1Haskell2010

Distribution.Nixpkgs.PackageMap

Build a lookup table from package identifiers to full attribute paths in nixpkgs.

1 type
2 values

Packagedistribution-nixpkgs-1.7.1.1
Exports3
LanguageHaskell2010
LicenceBSD-3-Clause
SourcePackageMap.hs

typetype PackageMap = Map Identifier (Set Path)

valuereadNixpkgPackageMap

:: String
Path to nixpkgs, must be a valid nix path (absolute, relative or NIX_PATH lookup)
-> Maybe String
(Optional) argument attribute set to pass to nixpkgs. Must be a valid nix attribute set.
-> IO PackageMap

Evaluate nixpkgs at a given (nix) path and build a Map keeping track of all Paths that end in a given Identifier and evaluate to a derivation. This can be used to find an attribute Path for an arbitrary package name using resolve.

Note: Evaluation of nixpkgs is very expensive (takes multiple seconds), so cache the result of this function if possible.

Example1 expression

>>> readNixpkgPackageMap "<nixpkgs>" (Just "{ config = { allowAliases = false; }; }")fromList [ … ]

valueresolve :: PackageMap -> Identifier -> Maybe Binding

Finds the shortest Path in a PackageMap that has the given Identifier as its last component.

Example1 expression

>>> resolve nixpkgs (ident # "pam")Just (Bind (Identifier "pam") (Path [Identifier "pam"]))