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top-level/splice.nix: add NIXPKGS_ALWAYS_SPLICE debugging aid #263277

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top-level/splice.nix: add NIXPKGS_ALWAYS_SPLICE debugging aid #263277

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13 changes: 12 additions & 1 deletion pkgs/top-level/splice.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,15 @@
# For performance reasons, rather than uniformally splice in all cases, we only
# do so when `pkgs` and `buildPackages` are distinct. The `actuallySplice`
# parameter there the boolean value of that equality check.

let
# This is for debugging only. It significantly degrades
# performance. In theory it is impure, but in practice it should
# not affect the result of eval unless you're going out of your
# way to detect that it has been set (i.e. myDrv?__spliced).
NIXPKGS_ALWAYS_SPLICE = builtins.getEnv("NIXPKGS_ALWAYS_SPLICE") != "";
in

lib: pkgs: actuallySplice:

let
Expand Down Expand Up @@ -102,7 +111,9 @@ let
, pkgsHostTarget
, pkgsTargetTarget
} @ args:
if actuallySplice then spliceReal args else pkgsHostTarget;
if !NIXPKGS_ALWAYS_SPLICE && actuallySplice
then pkgsHostTarget
else spliceReal args;

splicedPackages = splicePackages
{
Expand Down