Add copy of src/ios/build/bots/scripts to unbreak iOS Simulator bots.

BUG=webrtc:6934
TBR=ehmaldonado@webrtc.org

Review-Url: https://codereview.webrtc.org/2595173003 .
Cr-Commit-Position: refs/heads/master@{#15756}

ios/build/bots/scripts/find_xcode.py

@@ -0,0 +1,195 @@
+#!/usr/bin/python
+# Copyright 2016 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.
+
+"""Finds Xcode installations, optionally switching to a desired version.
+
+Usage:
+  ./find_xcode.py -j /tmp/out.json -v 6.0.1
+
+  Finds Xcode 6.0.1 and switches to it. Writes a summary to /tmp/out.json
+  that includes the Xcode installations that were found, the Xcode version
+  that was active before running this script, and the Xcode version that
+  is active after running this script.
+
+  e.g. {
+    "installations": {
+      "/Applications/Xcode5.app": "5.1.1 (5B1008)",
+      "/Applications/Xcode6.app": "6.0 (6A313)",
+      "/Applications/Xcode6.0.1.app": "6.0.1 (6A317)",
+      "/Applications/Xcode6.1.app": "6.1 (6A1046a)",
+    },
+    "matches": {
+      "/Applications/Xcode6.0.1.app": "6.0.1 (6A317)",
+    },
+    "previous version": {
+      "path": "/Application/Xcode5.app",
+      "version": "5.1.1",
+      "build": "(5B1008)",
+    },
+    "current version": {
+      "path": "/Applications/Xcode6.0.1.app",
+      "version": "6.0.1",
+      "build": "6A317",
+    },
+    "found": true,
+  }
+"""
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+
+
+def get_xcodebuild_path(xcode_app):
+  """Returns the path to xcodebuild under the given Xcode app.
+
+  Args:
+    xcode_app: The path to an installed Xcode.app. e.g. /Applications/Xcode.app.
+
+  Returns:
+    The absolute path to the xcodebuild binary under the given Xcode app.
+  """
+  return os.path.join(
+    xcode_app,
+    'Contents',
+    'Developer',
+    'usr',
+    'bin',
+    'xcodebuild',
+  )
+
+
+def get_xcode_version(xcodebuild):
+  """Returns the Xcode version and build version.
+
+  Args:
+    xcodebuild: The absolute path to the xcodebuild binary.
+
+  Returns:
+    A tuple of (version string, build version string).
+      e.g. ("6.0.1", "6A317")
+  """
+  # Sample output:
+  # Xcode 6.0.1
+  # Build version 6A317
+  out = subprocess.check_output([xcodebuild, '-version']).splitlines()
+  return out[0].split(' ')[-1], out[1].split(' ')[-1]
+
+
+def get_current_xcode_info():
+  """Returns the current Xcode path, version, and build number.
+
+  Returns:
+    A dict with 'path', 'version', and 'build' keys.
+      'path': The absolute path to the Xcode installation.
+      'version': The Xcode version.
+      'build': The Xcode build version.
+  """
+  version, build_version = get_xcode_version('xcodebuild')
+
+  return {
+    'path': subprocess.check_output(['xcode-select', '--print-path']).rstrip(),
+    'version': version,
+    'build': build_version,
+  }
+
+
+def find_xcode(target_version=None):
+  """Finds all Xcode versions, switching to the given Xcode version.
+
+  Args:
+    target_version: The version of Xcode to switch to, or None if the
+      Xcode version should not be switched.
+
+  Returns:
+    A summary dict as described in the usage section above.
+  """
+  xcode_info = {
+    'installations': {
+    },
+    'current version': {
+    },
+  }
+
+  if target_version:
+    xcode_info['found'] = False
+    xcode_info['matches'] = {}
+    xcode_info['previous version'] = get_current_xcode_info()
+
+    if xcode_info['previous version']['version'] == target_version:
+      xcode_info['found'] = True
+
+  for app in os.listdir(os.path.join('/', 'Applications')):
+    if app.startswith('Xcode'):
+      installation_path = os.path.join('/', 'Applications', app)
+      xcodebuild = get_xcodebuild_path(installation_path)
+
+      if os.path.exists(xcodebuild):
+        version, build_version = get_xcode_version(xcodebuild)
+
+        xcode_info['installations'][installation_path] = "%s (%s)" % (
+          version,
+          build_version,
+        )
+
+        if target_version and version == target_version:
+          xcode_info['matches'][installation_path] = "%s (%s)" % (
+            version,
+            build_version,
+          )
+
+          # If this is the first match, switch to it.
+          if not xcode_info['found']:
+            subprocess.check_call([
+              'sudo',
+              'xcode-select',
+              '-switch',
+              installation_path,
+            ])
+
+            xcode_info['found'] = True
+
+  xcode_info['current version'] = get_current_xcode_info()
+
+  if target_version and not xcode_info['found']:
+    # Flush buffers to ensure correct output ordering for buildbot.
+    sys.stdout.flush()
+    sys.stderr.write('Target Xcode version not found: %s\n' % target_version)
+    sys.stderr.flush()
+
+  return xcode_info
+
+
+def main(args):
+  xcode_info = find_xcode(args.version)
+
+  if args.json_file:
+    with open(args.json_file, 'w') as json_file:
+      json.dump(xcode_info, json_file)
+
+  if args.version and not xcode_info['found']:
+    return 1
+
+  return 0
+
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+    '-j',
+    '--json-file',
+    help='Location to write a JSON summary.',
+    metavar='file',
+  )
+  parser.add_argument(
+    '-v',
+    '--version',
+    help='Xcode version to find and switch to.',
+    metavar='ver',
+  )
+
+  sys.exit(main(parser.parse_args()))