yarn: init at 0.17.8 (#20635)

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 . -maxdepth 1 -type d | tail -1)"
+          packageDir=$(find . -type d -maxdepth 1 | tail -1)
           
           # Restore write permissions to make building work
           find "$packageDir" -type d -print0 | xargs -0 chmod u+x
@@ -133,18 +133,11 @@ let
           mv "$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
@@ -214,9 +207,6 @@ 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
         
@@ -273,13 +263,10 @@ let
           # calling executables outside the Nix store as much as possible
           patchShebangs .
           
-          export HOME=$PWD
+          export HOME=$TMPDIR
           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
           ''}
 

pkgs/development/node-packages/node-packages.json

@@ -62,4 +62,5 @@
 , "webdrvr"
 , "webpack"
 , "wring"
+, "yarn"
 ]

pkgs/top-level/node-packages.json

@@ -183,6 +183,7 @@
 , "wscat"
 , "wu"
 , "x509"
+, "yarn"
 , { "guifi-earth": "https://github.com/jmendeth/guifi-earth/tarball/f3ee96835fd4fb0e3e12fadbd2cb782770d64854 " }
 , { "mongoose": "3.6.x" }
 , { "node-uptime": "https://github.com/fzaninotto/uptime/tarball/1c65756575f90f563a752e2a22892ba2981c79b7" }