bazel_0_4: set absolute path to /usr/bin/env

Also cleanup TMPDIR.

pkgs/development/tools/build-managers/bazel/0.4.nix

@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, jdk, zip, unzip, bash, makeWrapper, which
+{ stdenv, lib, fetchurl, jdk, zip, unzip, bash, makeWrapper, which, coreutils
 # Always assume all markers valid (don't redownload dependencies).
 # Also, don't clean up environment variables.
 , enableNixHacks ? false
@@ -23,27 +23,24 @@ stdenv.mkDerivation rec {
     sha256 = "0asmq3kxnl4326zhgh13mvcrc8jvmiswjj4ymrq0943q4vj7nwrb";
   };
 
+  preUnpack = ''
+    mkdir bazel
+    cd bazel
+  '';
   sourceRoot = ".";
 
   patches = lib.optional enableNixHacks ./nix-hacks.patch;
 
   postPatch = ''
-    for f in $(grep -l -r '#!/bin/bash'); do
-      substituteInPlace "$f" --replace '#!/bin/bash' '#!${bash}/bin/bash'
+    for f in $(grep -l -r '/bin/bash'); do
+      substituteInPlace "$f" --replace '/bin/bash' '${bash}/bin/bash'
     done
-    for f in \
-      src/main/java/com/google/devtools/build/lib/analysis/CommandHelper.java \
-      src/main/java/com/google/devtools/build/lib/bazel/rules/BazelConfiguration.java \
-      src/main/java/com/google/devtools/build/lib/bazel/rules/sh/BazelShRuleClasses.java \
-      src/main/java/com/google/devtools/build/lib/rules/cpp/LinkCommandLine.java \
-      ; do
-      substituteInPlace "$f" --replace /bin/bash ${bash}/bin/bash
+    for f in $(grep -l -r '/usr/bin/env'); do
+      substituteInPlace "$f" --replace '/usr/bin/env' '${coreutils}/bin/env'
     done
   '';
 
   buildInputs = [
-    stdenv.cc
-    stdenv.cc.cc.lib
     jdk
     zip
     unzip
@@ -58,12 +55,7 @@ stdenv.mkDerivation rec {
     bash
   ];
 
-  # If TMPDIR is in the unpack dir we run afoul of blaze's infinite symlink
-  # detector (see com.google.devtools.build.lib.skyframe.FileFunction).
-  # Change this to $(mktemp -d) as soon as we figure out why.
-
   buildPhase = ''
-    export TMPDIR=/tmp
     ./compile.sh
     ./output/bazel --output_user_root=/tmp/.bazel build //scripts:bash_completion \
       --spawn_strategy=standalone \