Add script for updating node and python binaries in google storage (#486)

In both cases updating these is slightly non-trivial so encode
the process in the script.

scripts/update_node.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+# Copyright 2020 The Emscripten Authors.  All rights reserved.
+# Emscripten is available under two separate licenses, the MIT license and the
+# University of Illinois/NCSA Open Source License.  Both these licenses can be
+# found in the LICENSE file.
+
+"""Updates the node binaries that we cache store at
+http://storage.google.com/webassembly.
+
+For the windows version we also alter the directory layout to add the 'bin'
+direcotry.
+"""
+
+import urllib.request
+import subprocess
+import os
+import shutil
+
+version = '12.16.3'
+base = 'https://nodejs.org/dist/latest-v12.x/'
+upload_base = 'gs://webassembly/emscripten-releases-builds/deps/'
+
+suffixes = [
+    '-win-x64.zip',
+    '-darwin-x64.tar.gz',
+    '-linux-x64.tar.xz',
+    '-linux-arm64.tar.xz',
+    '-linux-armv7l.tar.xz',
+]
+
+for suffix in suffixes:
+    filename = 'node-v%s%s' % (version, suffix)
+    download_url = base + filename
+    print('Downloading: ' + download_url)
+    urllib.request.urlretrieve(download_url, filename)
+
+    if '-win-' in suffix:
+      subprocess.check_call(['unzip', '-q', filename])
+      dirname = os.path.splitext(os.path.basename(filename))[0]
+      shutil.move(dirname, 'bin')
+      os.mkdir(dirname)
+      shutil.move('bin', dirname)
+      subprocess.check_call(['zip', '-rq', filename, dirname])
+      shutil.rmtree(dirname)
+
+    upload_url = upload_base + filename
+    print('Uploading: ' + upload_url)
+    cmd = ['gsutil', 'cp', '-n', filename, upload_url]
+    print(' '.join(cmd))
+    subprocess.check_call(cmd)
+    os.remove(filename)

scripts/update_python.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+# Copyright 2020 The Emscripten Authors.  All rights reserved.
+# Emscripten is available under two separate licenses, the MIT license and the
+# University of Illinois/NCSA Open Source License.  Both these licenses can be
+# found in the LICENSE file.
+
+"""Updates the python binaries that we cache store at
+http://storage.google.com/webassembly.
+
+Currently this is windows only and we rely on the system python on other
+platforms.
+
+We currently bundle a version of python for windows use the following
+recipe:
+  1. Download the "embeddable zip file" version of python from python.org
+  2. Remove .pth file to work around https://bugs.python.org/issue34841
+  3. Download and install pywin32 in the `site-packages` directory
+  4. Re-zip and upload to storage.google.com
+"""
+
+import urllib.request
+import subprocess
+import os
+import shutil
+import sys
+
+version = '3.7.4'
+base = 'https://www.python.org/ftp/python/%s/' % version
+
+pywin32_version = '227'
+pywin32_base = 'https://github.com/mhammond/pywin32/releases/download/b%s/' % pywin32_version
+
+upload_base = 'gs://webassembly/emscripten-releases-builds/deps/'
+
+
+def make_python_patch(arch):
+    if arch == 'amd64':
+      pywin32_filename = 'pywin32-%s.win-%s-py3.7.exe' % (pywin32_version, arch)
+    else:
+      pywin32_filename = 'pywin32-%s.%s-py3.7.exe' % (pywin32_version, arch)
+    filename = 'python-%s-embed-%s.zip' % (version, arch)
+    out_filename = 'python-%s-embed-%s+pywin32.zip' % (version, arch)
+    if not os.path.exists(pywin32_filename):
+        download_url = pywin32_base + pywin32_filename
+        print('Downloading pywin32: ' + download_url)
+        urllib.request.urlretrieve(download_url, pywin32_filename)
+
+    if not os.path.exists(filename):
+        download_url = base + filename
+        print('Downloading python: ' + download_url)
+        urllib.request.urlretrieve(download_url, filename)
+
+    os.mkdir('python-embed')
+    subprocess.check_call(['unzip', '-q', os.path.abspath(filename)], cwd='python-embed')
+    os.remove(os.path.join('python-embed', 'python37._pth'))
+
+    os.mkdir('pywin32')
+    rtn = subprocess.call(['unzip', '-q', os.path.abspath(pywin32_filename)], cwd='pywin32')
+    assert rtn in [0, 1]
+
+    os.mkdir(os.path.join('python-embed', 'lib'))
+    shutil.move(os.path.join('pywin32', 'PLATLIB'), os.path.join('python-embed', 'lib', 'site-packages'))
+
+    subprocess.check_call(['zip', '-rq', os.path.join('..', out_filename), '.'], cwd='python-embed')
+
+    upload_url = upload_base + out_filename
+    print('Uploading: ' + upload_url)
+    cmd = ['gsutil', 'cp', '-n', out_filename, upload_url]
+    print(' '.join(cmd))
+    subprocess.check_call(cmd)
+
+    # cleanup if everything went fine
+    shutil.rmtree('python-embed')
+    shutil.rmtree('pywin32')
+
+
+def main():
+    for arch in ('amd64', 'win32'):
+        make_python_patch(arch)
+
+    return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())