[issue43547] support ZIP files with zeroed out fields (e.g. for reproducible builds)

[Christian Heimes]

Christian Heimes <li...@cheimes.de> added the comment:

zinfo = zipfile.ZipInfo()
zinfo.date_time = (1980, 0, 0, 0, 0, 0)
zinfo.create_system = 0

external_attr == 0 may cause issues with permissions. I do something like this 
in my reproducible tarfile code:

if zinfo.isdir():
    # 0755 + MS-DOS directory flag
    zinfo.external_attr = 0o755 | 0x010
else:
    zinfo.external_attr = 0o644

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<https://bugs.python.org/issue43547>
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