[nix] fix vcs data write error

Signed-off-by: unlsycn <[email protected]>

templates/chisel/nix/gcd/vcs.nix

@@ -12,6 +12,16 @@
 
 let
   binName = "gcd-vcs-simulator";
+  vcsWrapper = out: ''
+    # We need to carefully handle string escape here, so don't use makeWrapper
+    tee $out/bin/${binName} <<EOF
+    #!${bash}/bin/bash
+    export LD_LIBRARY_PATH="$out/lib/${binName}.daidir:\$LD_LIBRARY_PATH"
+    _argv="\$@"
+    ${vcs-fhs-env}/bin/vcs-fhs-env -c "$out/lib/${binName} \$_argv"
+    EOF
+    chmod +x $out/bin/${binName}
+  '';
 in
 stdenv.mkDerivation (finalAttr: {
   name = "vcs";
@@ -58,9 +68,15 @@ stdenv.mkDerivation (finalAttr: {
     inherit rtl;
 
     tests.simple-sim = runCommand "${binName}-test" { __noChroot = true; } ''
+      mkdir -p $out/bin
+      cp -r ${finalAttr.finalPackage}/lib $out/lib
+
+      ${vcsWrapper "$out"}
+
       # Combine stderr and stdout and redirect them to tee
       # So that we can have log saving to output and also printing to stdout
-      ${finalAttr.finalPackage}/bin/${binName} &> >(tee $out)
+      ls -l $out/lib
+      $out/bin/${binName} &> >(tee $out/result.log)
     '';
   };
 
@@ -76,14 +92,7 @@ stdenv.mkDerivation (finalAttr: {
     cp ${binName} $out/lib
     cp -r ${binName}.daidir $out/lib
 
-    # We need to carefully handle string escape here, so don't use makeWrapper
-    tee $out/bin/${binName} <<EOF
-    #!${bash}/bin/bash
-    export LD_LIBRARY_PATH="$out/lib/${binName}.daidir:\$LD_LIBRARY_PATH"
-    _argv="\$@"
-    ${vcs-fhs-env}/bin/vcs-fhs-env -c "$out/lib/${binName} \$_argv"
-    EOF
-    chmod +x $out/bin/${binName}
+    ${vcsWrapper "$out"}
 
     runHook postInstall
   '';