From ddd8ca76de7fb32f2253986e425f161c11472cf0 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Mon, 13 Dec 2021 23:55:16 -0500
Subject: Bug: giv correct paths to runBuildAnalyze

---
 Biz/Bild.nix | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Biz/Bild.nix b/Biz/Bild.nix
index a4e655b..8d57d54 100644
--- a/Biz/Bild.nix
+++ b/Biz/Bild.nix
@@ -48,17 +48,21 @@ in rec {
   };
 
   # wrapper around bild
-  runBildAnalyze = main: stdenv.mkDerivation {
+  runBildAnalyze = main: stdenv.mkDerivation rec {
     name = "bild-analysis";
     src = ../.;
     USER = "nixbld";
     HOSTNAME = "nix-sandbox";
-    BIZ_ROOT = "$src";
+    # this is the default sandbox path where bild will be working:
+    BIZ_ROOT = "/build/biz";
+    # we need to remove the $src root because bild expects paths relative to the
+    # working directory:
+    MAIN = "." + lib.strings.removePrefix (toString src) (toString main);
     buildPhase = ''
       set -eux
       mkdir $out
       : analyzing with bild
-      ${bild}/bin/bild --json ${main} 1> $out/analysis.json 2> $out/stderr
+      ${bild}/bin/bild --json "$MAIN" 1> $out/analysis.json 2> $out/stderr
       set +eux
     '';
     installPhase = "exit 0";
-- 
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