DevTools: Make eslint mandatory and check node.js/npm modules in presubmit

third_party/WebKit/Source/devtools/scripts/install_node_deps.py

+#!/usr/bin/env 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.
+
+"""
+Ensure node.js and npm modules are installed
+"""
+
+import os
+from os import path
+import shutil
+import subprocess
+import sys
+
+MIN_NODE_VERSION = 4
+LOCAL_NODE_VERSION = '4.5.0'
+
+scripts_path = path.dirname(path.abspath(__file__))
+install_local_node_path = path.join(scripts_path, 'local_node', 'node.py')
+local_node_runtimes_path = path.join(scripts_path, 'local_node', 'runtimes')
+local_node_binary_path = path.join(local_node_runtimes_path, LOCAL_NODE_VERSION, 'bin', 'node')
+local_npm_binary_path = path.join(local_node_runtimes_path, LOCAL_NODE_VERSION, 'bin', 'npm')
+
+
+def main():
+    (node_path, npm_path) = resolve_node_paths()
+    npm_install(npm_path)
+
+
+def resolve_node_paths():
+    if has_valid_global_node():
+        return (which('node'), which('npm'))
+    has_installed_local_node = path.isfile(local_node_binary_path)
+    if has_installed_local_node:
+        return (local_node_binary_path, local_npm_binary_path)
+    if path.isdir(local_node_runtimes_path):
+        shutil.rmtree(local_node_runtimes_path)
+    if sys.platform == 'linux2':
+        install_node()
+        return (local_node_binary_path, local_npm_binary_path)
+    print('ERROR: Please install the latest node.js LTS version using the Mac or Windows installer:')
+    print('https://nodejs.org/en/download/')
+    raise
+
+
+def has_valid_global_node():
+    node_path = which('node')
+    if not node_path:
+        return False
+    node_process = popen([node_path, '--version'])
+    (node_process_out, _) = node_process.communicate()
+    if node_process.returncode != 0:
+        return False
+    major_version = node_process_out[1]
+    return int(major_version) >= MIN_NODE_VERSION
+
+
+def install_node():
+    print('Installing node.js locally at {}'.format(local_node_runtimes_path))
+    print('NOTE: this does not add to PATH or affect global node installation')
+    node_env = {'NODE_VERSION': LOCAL_NODE_VERSION}
+    install_node_process = popen([install_local_node_path, '--version'], env=node_env)
+    (node_process_out, error) = install_node_process.communicate()
+    if install_node_process.returncode != 0:
+        print('Could not install node locally')
+        print(error)
+        raise
+    print(node_process_out)
+
+
+def npm_install(npm_path):
+    print('Runing npm install using {}'.format(npm_path))
+    npm_process = popen([npm_path, 'install'])
+    (npm_process_out, _) = npm_process.communicate()
+    if npm_process.returncode != 0:
+        print('WARNING: npm install had an issue')
+    print(npm_process_out)
+
+
+# Based on http://stackoverflow.com/questions/377017/test-if-executable-exists-in-python.
+def which(program):
+    def is_exe(fpath):
+        return path.isfile(fpath) and os.access(fpath, os.X_OK)
+
+    fpath, fname = path.split(program)
+    if fpath:
+        if is_exe(program):
+            return program
+    else:
+        for part in os.environ['PATH'].split(os.pathsep):
+            part = part.strip('\"')
+            exe_file = path.join(part, program)
+            if is_exe(exe_file):
+                return exe_file
+    return None
+
+
+def popen(arguments, env=None):
+    return subprocess.Popen(
+        arguments, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env)
+
+
+if __name__ == '__main__':
+    sys.exit(main())