node-env: use upstream version

pkgs/development/node-packages/node-env.nix

@@ -123,7 +123,7 @@ let
       if [ -f "${src}" ]
       then
           # Figure out what directory has been unpacked
-          packageDir=$(find . -type d -maxdepth 1 | tail -1)
+          packageDir="$(find . -maxdepth 1 -type d | tail -1)"
 
           # Restore write permissions to make building work
           find "$packageDir" -type d -print0 | xargs -0 chmod u+x
@@ -133,11 +133,18 @@ let
           mv "$packageDir" "$DIR/${packageName}"
       elif [ -d "${src}" ]
       then
+          # Get a stripped name (without hash) of the source directory.
+          # On old nixpkgs it's already set internally.
+          if [ -z "$strippedName" ]
+          then
+              strippedName="$(stripHash ${src})"
+          fi
+
           # Restore write permissions to make building work
-          chmod -R u+w $strippedName
+          chmod -R u+w "$strippedName"
 
           # Move the extracted directory into the output folder
-          mv $strippedName "$DIR/${packageName}"
+          mv "$strippedName" "$DIR/${packageName}"
       fi
 
       # Unset the stripped name to not confuse the next unpack step
@@ -207,6 +214,9 @@ let
 
         if [ "$dontNpmInstall" != "1" ]
         then
+            # NPM tries to download packages even when they already exist if npm-shrinkwrap is used.
+            rm -f npm-shrinkwrap.json
+
             npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} install
         fi
 
@@ -263,10 +273,13 @@ let
           # calling executables outside the Nix store as much as possible
           patchShebangs .
 
-          export HOME=$TMPDIR
+          export HOME=$PWD
           npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} rebuild
 
           ${stdenv.lib.optionalString (!dontNpmInstall) ''
+            # NPM tries to download packages even when they already exist if npm-shrinkwrap is used.
+            rm -f npm-shrinkwrap.json
+
             npm --registry http://www.example.com --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} install
           ''}