Add support for binary builds with PyInstaller

See https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2729

pyinstaller.spec

@@ -0,0 +1,102 @@
+# -*- mode: python -*-
+
+from __future__ import print_function
+
+from distutils.sysconfig import get_python_lib
+import hashlib
+import os
+import platform
+import shutil
+import struct
+import sys
+
+
+if not hasattr(sys, 'real_prefix'):
+    sys.exit("Please run inside a virtualenv with Tahoe-LAFS installed.")
+
+
+# Ugly hack to disable the setuptools requirement asserted in '_auto_deps.py'.
+# Without patching out this requirement, frozen binaries will fail at runtime.
+autodeps_path = os.path.join(get_python_lib(), 'allmydata', '_auto_deps.py')
+print("Patching '{}' to remove setuptools check...".format(autodeps_path))
+autodeps_path_backup = autodeps_path + '.backup'
+shutil.copy2(autodeps_path, autodeps_path_backup)
+with open(autodeps_path_backup) as src, open(autodeps_path, 'w+') as dest:
+    dest.write(src.read().replace('"setuptools >=', '#"setuptools >='))
+print("Done!")
+
+
+options = [('u', None, 'OPTION')]  # Unbuffered stdio
+
+added_files = [
+    ('COPYING.*', '.'),
+    ('CREDITS', '.'),
+    ('relnotes.txt', '.'),
+    ('src/allmydata/web/*.xhtml', 'allmydata/web'),
+    ('src/allmydata/web/static/*', 'allmydata/web/static'),
+    ('src/allmydata/web/static/css/*', 'allmydata/web/static/css'),
+    ('src/allmydata/web/static/img/*.png', 'allmydata/web/static/img')]
+
+a = Analysis(
+    ['static/tahoe.py'],
+    pathex=[],
+    binaries=None,
+    datas=added_files,
+    hiddenimports=['characteristic', 'cffi'],
+    hookspath=[],
+    runtime_hooks=[],
+    excludes=[],
+    win_no_prefer_redirects=False,
+    win_private_assemblies=False,
+    cipher=None)
+
+pyz = PYZ(
+    a.pure,
+    a.zipped_data,
+    cipher=None)
+
+exe = EXE(
+    pyz,
+    a.scripts,
+    options,
+    exclude_binaries=True,
+    name='tahoe',
+    debug=False,
+    strip=False,
+    upx=False,
+    console=True)
+
+coll = COLLECT(
+    exe,
+    a.binaries,
+    a.zipfiles,
+    a.datas,
+    strip=False,
+    upx=False,
+    name='Tahoe-LAFS')
+
+
+# Revert the '_auto_deps.py' patch above
+shutil.move(autodeps_path_backup, autodeps_path)
+
+
+print("Creating archive...")
+platform_tag = platform.system().replace('Darwin', 'MacOS')
+bitness_tag = str(struct.calcsize('P') * 8) + 'bit'
+archive_name = 'Tahoe-LAFS-{}-{}'.format(platform_tag, bitness_tag)
+if sys.platform == 'win32':
+    archive_format = 'zip'
+    archive_suffix = '.zip'
+else:
+    archive_format = 'gztar'
+    archive_suffix = '.tar.gz'
+base_name = os.path.join('dist', archive_name)
+shutil.make_archive(base_name, archive_format, 'dist', 'Tahoe-LAFS')
+
+print("Hashing (SHA256)...")
+archive_path = base_name + archive_suffix
+hasher = hashlib.sha256()
+with open(archive_path, 'rb') as f:
+    for block in iter(lambda: f.read(4096), b''):
+        hasher.update(block)
+print("{}  {}".format(hasher.hexdigest(), archive_path))

tox.ini

@@ -102,3 +102,17 @@ deps =
 skip_install = True
 commands =
          sphinx-build -b html -d {toxinidir}/docs/_build/doctrees {toxinidir}/docs {toxinidir}/docs/_build/html
+
+[testenv:pyinstaller]
+basepython=python2.7
+# Do not use the '--editable' flag for this testenv as the 'pyinstaller.spec'
+# script called below will need patch the source tree at build-time in order
+# to remove the setuptools requirement from '_auto_deps.py' (and we want to
+# avoid race-conditions when running tests in parallel, e.g., with "detox").
+deps =
+    .
+    pyinstaller
+# Setting PYTHONHASHSEED to a known value assists with reproducible builds.
+# See https://pyinstaller.readthedocs.io/en/stable/advanced-topics.html#creating-a-reproducible-build
+setenv=PYTHONHASHSEED=1
+commands=pyinstaller -y --clean pyinstaller.spec