Pass lists/attrsets to bash as (associative) arrays

tests/config.nix

@@ -13,7 +13,7 @@ rec {
     derivation ({
       inherit system;
       builder = shell;
-      args = ["-e" args.builder or (builtins.toFile "builder.sh" "eval \"$buildCommand\"")];
+      args = ["-e" args.builder or (builtins.toFile "builder.sh" "if [ -e .attrs.sh ]; then source .attrs.sh; fi; eval \"$buildCommand\"")];
       PATH = path;
     } // removeAttrs args ["builder" "meta"])
     // { meta = args.meta or {}; };

tests/local.mk

@@ -14,7 +14,8 @@ nix_tests = \
   placeholders.sh nix-shell.sh \
   linux-sandbox.sh \
   build-remote.sh \
-  nar-index.sh
+  nar-index.sh \
+  structured-attrs.sh
   # parallel.sh
 
 install-tests += $(foreach x, $(nix_tests), tests/$(x))

tests/structured-attrs.nix

@@ -0,0 +1,47 @@
+with import ./config.nix;
+
+mkDerivation {
+  name = "structured";
+
+  __structuredAttrs = true;
+
+  buildCommand = ''
+    set -x
+
+    [[ $int = 123456789 ]]
+    [[ -z $float ]]
+    [[ -n $boolTrue ]]
+    [[ -z $boolFalse ]]
+    [[ -n ''${hardening[format]} ]]
+    [[ -z ''${hardening[fortify]} ]]
+    [[ ''${#buildInputs[@]} = 7 ]]
+    [[ ''${buildInputs[2]} = c ]]
+    [[ -v nothing ]]
+    [[ -z $nothing ]]
+
+    mkdir ''${outputs[out]}
+    echo bar > $dest
+  '';
+
+  buildInputs = [ "a" "b" "c" 123 "'" "\"" null ];
+
+  hardening.format = true;
+  hardening.fortify = false;
+
+  outer.inner = [ 1 2 3 ];
+
+  int = 123456789;
+
+  float = 123.456;
+
+  boolTrue = true;
+  boolFalse = false;
+
+  nothing = null;
+
+  dest = "${placeholder "out"}/foo";
+
+  "foo bar" = "BAD";
+  "1foobar" = "BAD";
+  "foo$" = "BAD";
+}

tests/structured-attrs.sh

@@ -0,0 +1,7 @@
+source common.sh
+
+clearStore
+
+outPath=$(nix-build structured-attrs.nix --no-out-link)
+
+[[ $(cat $outPath/foo) = bar ]]