Bug 1027842 - Make jit_test.py search in PATH to find the js shell command. r=terrence

js/src/jit-test/jit_test.py

@@ -19,6 +19,18 @@ add_libdir_to_path()
 import jittests
 from tests import TBPL_FLAGS
 
+# Python 3.3 added shutil.which, but we can't use that yet.
+def which(name):
+    if name.find(os.path.sep) != -1:
+        return os.path.abspath(name)
+
+    for path in os.environ["PATH"].split(os.pathsep):
+        full = os.path.join(path, name)
+        if os.path.exists(full):
+            return os.path.abspath(full)
+
+    return name
+
 def main(argv):
 
     # If no multiprocessing is available, fallback to serial test execution
@@ -201,7 +213,7 @@ def main(argv):
                 new_test.jitflags.extend(jitflags)
                 job_list.append(new_test)
 
-    prefix = [os.path.abspath(args[0])] + shlex.split(options.shell_args)
+    prefix = [which(args[0])] + shlex.split(options.shell_args)
     prolog = os.path.join(jittests.LIB_DIR, 'prolog.js')
     if options.remote:
         prolog = posixpath.join(options.remote_test_root, 'jit-tests', 'jit-tests', 'lib', 'prolog.js')