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