Bug 899695 - Fix exception in "mach python" on Windows [r=gps]

DONTBUILD (not part of the build)

mach

@@ -33,8 +33,7 @@ for dir_path in ancestors(os.getcwd()):
             # to look for a config file at the path in $MOZCONFIG rather than
             # its default locations.
             #
-            # Note: subprocess requires native strings in os.environ Python
-            # 2.7.2 and earlier on Windows.
+            # Note: subprocess requires native strings in os.environ on Windows
             os.environ[b"MOZCONFIG"] = str(info["mozconfig"])
 
         if "topsrcdir" in info:

python/mach_commands.py

@@ -59,7 +59,8 @@ class MachCommands(MachCommandBase):
         return self.run_process([self.python_executable] + args,
             pass_thru=True, # Allow user to run Python interactively.
             ensure_exit_code=False, # Don't throw on non-zero exit code.
-            append_env={'PYTHONDONTWRITEBYTECODE': '1'})
+            # Note: subprocess requires native strings in os.environ on Windows
+            append_env={b'PYTHONDONTWRITEBYTECODE': str('1')})
 
     @Command('python-test', category='testing',
         description='Run Python unit tests.')
@@ -109,7 +110,8 @@ class MachCommands(MachCommandBase):
                 [self.python_executable, file],
                 ensure_exit_code=False, # Don't throw on non-zero exit code.
                 log_name='python-test',
-                append_env={'PYTHONDONTWRITEBYTECODE': '1'},
+                # subprocess requires native strings in os.environ on Windows
+                append_env={b'PYTHONDONTWRITEBYTECODE': str('1')},
                 line_handler=_line_handler)
             return_code += inner_return_code
 

testing/mochitest/mach_commands.py

@@ -149,7 +149,6 @@ class MochitestRunner(MozbuildObject):
                 return 1
 
             options.testPath = test_path
-            env = {'TEST_PATH': test_path}
 
         if rerun_failures:
             options.testManifest = failure_file_path