Adds the ability to run pure Go unit tests in the Mojo test suite.

mojo/go/go.py

Index: mojo/go/go.py
diff --git a/mojo/go/go.py b/mojo/go/go.py
index a0f93f213e2bda88fdcff9351885d96b56f5c7fd..b2fe58fae50c58ef56be023043dbd3f3902aa5d7 100755
--- a/mojo/go/go.py
+++ b/mojo/go/go.py
@@ -16,12 +16,8 @@ python go.py /usr/lib/google-golang/bin/go out/build out/a.out .. "-I."
 import argparse
 import os
 import shutil
-import subprocess
 import sys
 
-NDK_PLATFORM = 'android-16'
-NDK_TOOLCHAIN = 'arm-linux-androideabi-4.9'
-
 def main():
   parser = argparse.ArgumentParser()
   parser.add_argument('--android', action='store_true')
@@ -37,58 +33,28 @@ def main():
   go_tool = os.path.abspath(args.go_tool)
   build_dir = args.build_directory
   out_file = os.path.abspath(args.output_file)
-  # The src directory specified is relative. We need this as an absolute path.
-  src_root = os.path.abspath(args.src_root)
-  # GOPATH must be absolute, and point to one directory up from |src_Root|
-  go_path = os.path.abspath(os.path.join(src_root, '..'))
-  # GOPATH also includes any third_party/go libraries that have been imported
-  go_path += ':' +  os.path.join(src_root, 'third_party', 'go')
-  go_path += ':' +  os.path.abspath(os.path.join(args.out_root, 'gen', 'go'))
-  if 'MOJO_GOPATH' in os.environ:
-    go_path += ':' + os.environ['MOJO_GOPATH']
   go_options = args.go_option
   try:
     shutil.rmtree(build_dir, True)
     os.mkdir(build_dir)
   except Exception:
     pass
-  old_directory = os.getcwd()
-  os.chdir(build_dir)
-  env = os.environ.copy()
-  env['GOPATH'] = go_path
-  env['GOROOT'] = os.path.dirname(os.path.dirname(go_tool))
-  env['CGO_CFLAGS'] = args.cgo_cflags
-  env['CGO_LDFLAGS'] = args.cgo_ldflags
-  if args.android:
-    env['CGO_ENABLED'] = '1'
-    env['GOOS'] = 'android'
-    env['GOARCH'] = 'arm'
-    env['GOARM'] = '7'
-    # The Android go tool prebuilt binary has a default path to the compiler,
-    # which with high probability points to an invalid path, so we override the
-    # CC env var that will be used by the go tool.
-    if 'CC' not in env:
-      ndk_path = os.path.join(src_root, 'third_party', 'android_tools', 'ndk')
-      if sys.platform.startswith('linux'):
-        arch = 'linux-x86_64'
-      elif sys.platform == 'darwin':
-        arch = 'darwin-x86_64'
-      else:
-        raise Exception('unsupported platform: ' + sys.platform)
-      ndk_cc = os.path.join(ndk_path, 'toolchains', NDK_TOOLCHAIN,
-          'prebuilt', arch, 'bin', 'arm-linux-androideabi-gcc')
-      sysroot = os.path.join(ndk_path, 'platforms', NDK_PLATFORM, 'arch-arm')
-      env['CGO_CFLAGS'] += ' --sysroot %s' % sysroot
-      env['CGO_LDFLAGS'] += ' --sysroot %s' % sysroot
-      env['CC'] = '%s --sysroot %s' % (ndk_cc, sysroot)
 
-  call_result = subprocess.call([go_tool] + go_options, env=env)
+  sys.path.append(os.path.join(args.src_root, 'mojo', 'tools'))
+  from mopy.invoke_go import InvokeGo
+
+  call_result = InvokeGo(go_tool, go_options,
+                         work_dir=build_dir,
+                         src_root=args.src_root,
+                         out_root=args.out_root,
+                         cgo_cflags=args.cgo_cflags,
+                         cgo_ldflags=args.cgo_ldflags,
+                         target_android=args.android)
   if call_result != 0:
     return call_result
-  out_files = sorted([ f for f in os.listdir('.') if os.path.isfile(f)])
+  out_files = sorted([ f for f in os.listdir(build_dir) if os.path.isfile(f)])
   if (len(out_files) > 0):
     shutil.move(out_files[0], out_file)
-  os.chdir(old_directory)
   try:
     shutil.rmtree(build_dir, True)
   except Exception: