From 22d7c08dc506f74803b7c61c6cbf156dfe844f02 Mon Sep 17 00:00:00 2001 From: zimbatm Date: Sun, 28 Feb 2016 16:35:27 +0000 Subject: [PATCH] lib.trivial: add a new importJSON function This is meant to be used by packages who often re-generate their inputs. Producing valid JSON is easier than nix, and also garantees it's purity. --- lib/trivial.nix | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/lib/trivial.nix b/lib/trivial.nix index cda8aa08a20..9821e3c138d 100644 --- a/lib/trivial.nix +++ b/lib/trivial.nix @@ -75,4 +75,25 @@ rec { min = x: y: if x < y then x else y; max = x: y: if x > y then x else y; + /* Reads a JSON file. It is useful to import pure data into other nix + expressions. + + Example: + + mkDerivation { + src = fetchgit (importJSON ./repo.json) + #... + } + + where repo.json contains: + + { + "url": "git://some-domain/some/repo", + "rev": "265de7283488964f44f0257a8b4a055ad8af984d", + "sha256": "0sb3h3067pzf3a7mlxn1hikpcjrsvycjcnj9hl9b1c3ykcgvps7h" + } + + */ + importJSON = path: + builtins.fromJSON (builtins.readFile path); }