tests/determinate-nix/par.nix

builtins.parallel: start every top-level drvPath in the background, then collect them on the main thread. Returns a digest of the name -> drvPath map.

λnixpkgs, filter?

nixpkgs
filter	default null

let

8pkgs=

importnixpkgs

9system=

"x86_64-linux"

10config=

allowAliases = false;

13overlays=

[ ]

used by lib names v

15lib=

pkgs.lib

uses pkgs used by drvs r

16names=

builtins.attrNamespkgs

uses pkgs used by sel

17sel=

filter ≡ null

→

names

else

builtins.filtern: builtins.matchfilter n ≢ null names

uses names used by drvs

22drvs=

lib.genAttrssel

λn

let

25r=

builtins.tryEval

let

27v=

pkgs.${n}

uses pkgs

if lib.isDerivationv then v.drvPath else null

uses lib

if r.success then r.value else null

uses lib sel used by json

34json=

builtins.toJSONdrvs

uses drvs

builtins.parallelbuiltins.attrValuesdrvs

37count=

builtins.lengthsel

38sha256=

builtins.hashString"sha256" json