Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/util/bot/go/env.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Modified from go/env.py in Chromium infrastructure's repository to patch out
+# everything but the core toolchain.
+#
+# https://chromium.googlesource.com/infra/infra/
+
+"""Can be used to point environment variable to hermetic Go toolset.
+
+Usage (on linux and mac):
+$ eval `./env.py`
+$ go version
+
+Or it can be used to wrap a command:
+
+$ ./env.py go version
+"""
+
+assert __name__ == '__main__'
+
+import imp
+import os
+import subprocess
+import sys
+
+# Do not want to mess with sys.path, load the module directly.
+bootstrap = imp.load_source(
+    'bootstrap', os.path.join(os.path.dirname(__file__), 'bootstrap.py'))
+
+old = os.environ.copy()
+new = bootstrap.prepare_go_environ()
+
+if len(sys.argv) == 1:
+  for key, value in sorted(new.iteritems()):
+    if old.get(key) != value:
+      print 'export %s="%s"' % (key, value)
+else:
+  exe = sys.argv[1]
+  if exe == 'python':
+    exe = sys.executable
+  else:
+    # Help Windows to find the executable in new PATH, do it only when
+    # executable is referenced by name (and not by path).
+    if os.sep not in exe:
+      exe = bootstrap.find_executable(exe, [bootstrap.WORKSPACE])
+  sys.exit(subprocess.call([exe] + sys.argv[2:], env=new))