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#!/usr/bin/env python
"""
Helper script to rebuild virtualenv.py from virtualenv_support
"""
from __future__ import print_function
import os
import re
import codecs
from zlib import crc32 as _crc32
def crc32(data):
"""Python version idempotent"""
return _crc32(data) & 0xffffffff
here = os.path.dirname(__file__)
script = os.path.join(here, '..', 'virtualenv.py')
gzip = codecs.lookup('zlib')
b64 = codecs.lookup('base64')
file_regex = re.compile(
br'##file (.*?)\n([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*convert\("""\n(.*?)"""\)',
re.S)
file_template = b'##file %(filename)s\n%(varname)s = convert("""\n%(data)s""")'
def rebuild(script_path):
with open(script_path, 'rb') as f:
script_content = f.read()
parts = []
last_pos = 0
match = None
for match in file_regex.finditer(script_content):
parts += [script_content[last_pos:match.start()]]
last_pos = match.end()
filename, fn_decoded = match.group(1), match.group(1).decode()
varname = match.group(2)
data = match.group(3)
print('Found file %s' % fn_decoded)
pathname = os.path.join(here, '..', 'virtualenv_embedded', fn_decoded)
with open(pathname, 'rb') as f:
embedded = f.read()
new_crc = crc32(embedded)
new_data = b64.encode(gzip.encode(embedded)[0])[0]
if new_data == data:
print(' File up to date (crc: %08x)' % new_crc)
parts += [match.group(0)]
continue
# Else: content has changed
crc = crc32(gzip.decode(b64.decode(data)[0])[0])
print(' Content changed (crc: %08x -> %08x)' %
(crc, new_crc))
new_match = file_template % {
b'filename': filename,
b'varname': varname,
b'data': new_data
}
parts += [new_match]
parts += [script_content[last_pos:]]
new_content = b''.join(parts)
if new_content != script_content:
print('Content updated; overwriting... ', end='')
with open(script_path, 'wb') as f:
f.write(new_content)
print('done.')
else:
print('No changes in content')
if match is None:
print('No variables were matched/found')
if __name__ == '__main__':
rebuild(script)
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