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#!/usr/bin/env python
"""
Helper script to rebuild virtualenv.py from virtualenv_support
"""
from __future__ import print_function
import codecs
import os
import re
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, "..", "src", "virtualenv.py")
gzip = codecs.lookup("zlib")
b64 = codecs.lookup("base64")
file_regex = re.compile(br'# file (.*?)\n([a-zA-Z][a-zA-Z0-9_]+) = convert\(\n """\n(.*?)"""\n\)', re.S)
file_template = b'# file %(filename)s\n%(variable)s = convert(\n """\n%(data)s"""\n)'
def rebuild(script_path):
exit_code = 0
with open(script_path, "rb") as f:
script_content = f.read()
parts = []
last_pos = 0
match = None
_count = 0
for _count, match in enumerate(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()
variable = 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
exit_code = 1
# Else: content has changed
crc = crc32(gzip.decode(b64.decode(data)[0])[0])
print(" Content changed (crc: {:08x} -> {:08x})".format(crc, new_crc))
new_match = file_template % {b"filename": filename, b"variable": variable, 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 not _count:
exit_code = 1
raise SystemExit(exit_code)
if __name__ == "__main__":
rebuild(script)
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