devShellTools.{unstructuredDerivationInputEnv,derivationOutputEnv}: extract

1 files changed, 24 insertions, 1 deletions

diff --git a/pkgs/build-support/dev-shell-tools/default.nix b/pkgs/build-support/dev-shell-tools/default.nix
index cd5fa5f5937e..87432b42f360 100644
--- a/pkgs/build-support/dev-shell-tools/default.nix
+++ b/pkgs/build-support/dev-shell-tools/default.nix
@@ -1,4 +1,7 @@
-{ lib }:
+{
+  lib,
+  writeText,
+}:
 let
   inherit (builtins) typeOf;
 in
@@ -13,4 +16,24 @@ rec {
     if typeOf value == "path" then "${value}"
     else if typeOf value == "list" then toString (map valueToString value)
     else toString value;
+
+
+  # https://github.com/NixOS/nix/blob/2.8.0/src/libstore/build/local-derivation-goal.cc#L992-L1004
+  unstructuredDerivationInputEnv = { drvAttrs }:
+    # FIXME: this should be `normalAttrs // passAsFileAttrs`
+    lib.mapAttrs'
+      (name: value:
+        let str = valueToString value;
+        in if lib.elem name (drvAttrs.passAsFile or [])
+        then lib.nameValuePair "${name}Path" (writeText "pass-as-text-${name}" str)
+        else lib.nameValuePair name str
+      )
+      drvAttrs;
+
+  derivationOutputEnv = { outputList, outputMap }:
+    # A mapping from output name to the nix store path where they should end up
+    # https://github.com/NixOS/nix/blob/2.8.0/src/libexpr/primops.cc#L1253
+    lib.genAttrs outputList (output: builtins.unsafeDiscardStringContext outputMap.${output}.outPath);
+
+
 }