--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/packaging/inno/build.py	Sun Mar 03 18:19:07 2019 -0800
@@ -0,0 +1,272 @@
+#!/usr/bin/env python3
+# build.py - Inno installer build script.
+#
+# Copyright 2019 Gregory Szorc <gregory.szorc@gmail.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+# This script automates the building of the Inno MSI installer for Mercurial.
+
+# no-check-code because Python 3 native.
+
+import argparse
+import os
+import pathlib
+import shutil
+import subprocess
+import sys
+import tempfile
+
+
+DOWNLOADS = {
+    'gettext': {
+        'url': 'https://versaweb.dl.sourceforge.net/project/gnuwin32/gettext/0.14.4/gettext-0.14.4-bin.zip',
+        'size': 1606131,
+        'sha256': '60b9ef26bc5cceef036f0424e542106cf158352b2677f43a01affd6d82a1d641',
+        'version': '0.14.4',
+    },
+    'gettext-dep': {
+        'url': 'https://versaweb.dl.sourceforge.net/project/gnuwin32/gettext/0.14.4/gettext-0.14.4-dep.zip',
+        'size': 715086,
+        'sha256': '411f94974492fd2ecf52590cb05b1023530aec67e64154a88b1e4ebcd9c28588',
+    },
+    'py2exe': {
+        'url': 'https://versaweb.dl.sourceforge.net/project/py2exe/py2exe/0.6.9/py2exe-0.6.9.zip',
+        'size': 149687,
+        'sha256': '6bd383312e7d33eef2e43a5f236f9445e4f3e0f6b16333c6f183ed445c44ddbd',
+        'version': '0.6.9',
+    },
+    'virtualenv': {
+        'url': 'https://files.pythonhosted.org/packages/37/db/89d6b043b22052109da35416abc3c397655e4bd3cff031446ba02b9654fa/virtualenv-16.4.3.tar.gz',
+        'size': 3713208,
+        'sha256': '984d7e607b0a5d1329425dd8845bd971b957424b5ba664729fab51ab8c11bc39',
+        'version': '16.4.3',
+    },
+}
+
+
+PRINT_PYTHON_INFO = '''
+import platform, sys; print("%s:%d" % (platform.architecture()[0], sys.version_info[0]))
+'''.strip()
+
+
+def find_vc_runtime_files(x64=False):
+    """Finds Visual C++ Runtime DLLs to include in distribution."""
+    winsxs = pathlib.Path(os.environ['SYSTEMROOT']) / 'WinSxS'
+
+    prefix = 'amd64' if x64 else 'x86'
+
+    candidates = sorted(p for p in os.listdir(winsxs)
+                  if p.lower().startswith('%s_microsoft.vc90.crt_' % prefix))
+
+    for p in candidates:
+        print('found candidate VC runtime: %s' % p)
+
+    # Take the newest version.
+    version = candidates[-1]
+
+    d = winsxs / version
+
+    return [
+        d / 'msvcm90.dll',
+        d / 'msvcp90.dll',
+        d / 'msvcr90.dll',
+        winsxs / 'Manifests' / ('%s.manifest' % version),
+    ]
+
+
+def build(source_dir: pathlib.Path, build_dir: pathlib.Path,
+          python_exe: pathlib.Path, iscc_exe: pathlib.Path,
+          version=None):
+    """Build the Inno installer.
+
+    Build files will be placed in ``build_dir``.
+
+    py2exe's setup.py doesn't use setuptools. It doesn't have modern logic
+    for finding the Python 2.7 toolchain. So, we require the environment
+    to already be configured with an active toolchain.
+    """
+    from packagingutil import (
+        download_entry,
+        extract_tar_to_directory,
+        extract_zip_to_directory,
+    )
+
+    if not iscc.exists():
+        raise Exception('%s does not exist' % iscc)
+
+    if 'VCINSTALLDIR' not in os.environ:
+        raise Exception('not running from a Visual C++ build environment; '
+                        'execute the "Visual C++ <version> Command Prompt" '
+                        'application shortcut or a vcsvarsall.bat file')
+
+    # Identity x86/x64 and validate the environment matches the Python
+    # architecture.
+    vc_x64 = r'\x64' in os.environ['LIB']
+
+    res = subprocess.run(
+        [str(python_exe), '-c', PRINT_PYTHON_INFO],
+        capture_output=True, check=True)
+
+    py_arch, py_version = res.stdout.decode('utf-8').split(':')
+    py_version = int(py_version)
+
+    if vc_x64:
+        if py_arch != '64bit':
+            raise Exception('architecture mismatch: Visual C++ environment '
+                            'is configured for 64-bit but Python is 32-bit')
+    else:
+        if py_arch != '32bit':
+            raise Exception('architecture mismatch: Visual C++ environment '
+                            'is configured for 32-bit but Python is 64-bit')
+
+    if py_version != 2:
+        raise Exception('Only Python 2 is currently supported')
+
+    # Some extensions may require DLLs from the Universal C Runtime (UCRT).
+    # These are typically not in PATH and py2exe will have trouble finding
+    # them. We find the Windows 10 SDK and the UCRT files within.
+    sdk_path = (pathlib.Path(os.environ['ProgramFiles(x86)']) /
+                'Windows Kits' / '10' / 'Redist' / 'ucrt' / 'DLLs')
+
+    if vc_x64:
+        sdk_path = sdk_path / 'x64'
+    else:
+        sdk_path = sdk_path / 'x86'
+
+    if not sdk_path.is_dir():
+        raise Exception('UCRT files could not be found at %s' % sdk_path)
+
+    build_dir.mkdir(exist_ok=True)
+
+    gettext_pkg = download_entry(DOWNLOADS['gettext'], build_dir)
+    gettext_dep_pkg = download_entry(DOWNLOADS['gettext-dep'], build_dir)
+    virtualenv_pkg = download_entry(DOWNLOADS['virtualenv'], build_dir)
+    py2exe_pkg = download_entry(DOWNLOADS['py2exe'], build_dir)
+
+    venv_path = build_dir / ('venv-inno-%s' % ('x64' if vc_x64 else 'x86'))
+
+    gettext_root = build_dir / (
+        'gettext-win-%s' % DOWNLOADS['gettext']['version'])
+
+    if not gettext_root.exists():
+        extract_zip_to_directory(gettext_pkg, gettext_root)
+        extract_zip_to_directory(gettext_dep_pkg, gettext_root)
+
+    with tempfile.TemporaryDirectory() as td:
+        td = pathlib.Path(td)
+
+        # This assumes Python 2.
+        extract_tar_to_directory(virtualenv_pkg, td)
+        extract_zip_to_directory(py2exe_pkg, td)
+
+        virtualenv_src_path = td / ('virtualenv-%s' %
+            DOWNLOADS['virtualenv']['version'])
+        py2exe_source_path = td / ('py2exe-%s' %
+            DOWNLOADS['py2exe']['version'])
+
+        virtualenv_py = virtualenv_src_path / 'virtualenv.py'
+
+        if not venv_path.exists():
+            print('creating virtualenv with dependencies')
+            subprocess.run(
+                [str(python_exe), str(virtualenv_py), str(venv_path)],
+                check=True)
+
+        venv_python = venv_path / 'Scripts' / 'python.exe'
+        venv_pip = venv_path / 'Scripts' / 'pip.exe'
+
+        requirements_txt = (source_dir / 'contrib' / 'packaging' /
+                            'inno' / 'requirements.txt')
+        subprocess.run([str(venv_pip), 'install', '-r', str(requirements_txt)],
+                       check=True)
+
+        # Force distutils to use VC++ settings from environment, which was
+        # validated above.
+        env = dict(os.environ)
+        env['DISTUTILS_USE_SDK'] = '1'
+        env['MSSdk'] = '1'
+
+        py2exe_py_path = venv_path / 'Lib' / 'site-packages' / 'py2exe'
+        if not py2exe_py_path.exists():
+            print('building py2exe')
+            subprocess.run([str(venv_python), 'setup.py', 'install'],
+                           cwd=py2exe_source_path,
+                           env=env,
+                           check=True)
+
+        if str(sdk_path) not in os.environ['PATH'].split(os.pathsep):
+            print('adding %s to PATH' % sdk_path)
+            env['PATH'] = '%s%s%s' % (
+                os.environ['PATH'], os.pathsep, str(sdk_path))
+
+        # Register location of msgfmt and other binaries.
+        env['PATH'] = '%s%s%s' % (
+            env['PATH'], os.pathsep, str(gettext_root / 'bin'))
+
+        print('building Mercurial')
+        subprocess.run(
+            [str(venv_python), 'setup.py',
+             'py2exe', '-b', '3' if vc_x64 else '2',
+             'build_doc', '--html'],
+            cwd=str(source_dir),
+            env=env,
+            check=True)
+
+        # hg.exe depends on VC9 runtime DLLs. Copy those into place.
+        for f in find_vc_runtime_files(vc_x64):
+            if f.name.endswith('.manifest'):
+                basename = 'Microsoft.VC90.CRT.manifest'
+            else:
+                basename = f.name
+
+            dest_path = source_dir / 'dist' / basename
+
+            print('copying %s to %s' % (f, dest_path))
+            shutil.copyfile(f, dest_path)
+
+        print('creating installer')
+
+        args = [str(iscc_exe)]
+
+        if vc_x64:
+            args.append('/dARCH=x64')
+
+        if version:
+            args.append('/dVERSION=%s' % version)
+
+        args.append('/Odist')
+        args.append('contrib/packaging/inno/mercurial.iss')
+
+        subprocess.run(args, cwd=str(source_dir), check=True)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument('--python',
+                        required=True,
+                        help='path to python.exe to use')
+    parser.add_argument('--iscc',
+                        help='path to iscc.exe to use')
+    parser.add_argument('--version',
+                        help='Mercurial version string to use '
+                             '(detected from __version__.py if not defined')
+
+    args = parser.parse_args()
+
+    if args.iscc:
+        iscc = pathlib.Path(args.iscc)
+    else:
+        iscc = (pathlib.Path(os.environ['ProgramFiles(x86)']) / 'Inno Setup 5' /
+            'ISCC.exe')
+
+    here = pathlib.Path(os.path.abspath(os.path.dirname(__file__)))
+    source_dir = here.parent.parent.parent
+    build_dir = source_dir / 'build'
+
+    sys.path.insert(0, str(source_dir / 'contrib' / 'packaging'))
+
+    build(source_dir, build_dir, pathlib.Path(args.python), iscc,
+          version=args.version)