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contrib: macdeploy: monkey-patch gen-sdk to be deterministic

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on different Python versions (there was a change in TAR handling
between Python 3.8 and Python 3.9)
This commit is contained in:
Pavol Rusnak 2022-03-12 12:13:53 +01:00
parent 1868a17e5a
commit ba30a5407e
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contrib/macdeploy/gen-sdk
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@ -8,6 +8,21 @@ import gzip
import os
import contextlib
# monkey-patch Python 3.8 and older to fix wrong TAR header handling
# see https://github.com/bitcoin/bitcoin/pull/24534
# and https://github.com/python/cpython/pull/18080 for more info
if sys.version_info < (3, 9):
_old_create_header = tarfile.TarInfo._create_header
def _create_header(info, format, encoding, errors):
buf = _old_create_header(info, format, encoding, errors)
# replace devmajor/devminor with binary zeroes
buf = buf[:329] + bytes(16) + buf[345:]
# recompute checksum
chksum = tarfile.calc_chksums(buf)[0]
buf = buf[:-364] + bytes("%06o\0" % chksum, "ascii") + buf[-357:]
return buf
tarfile.TarInfo._create_header = staticmethod(_create_header)
@contextlib.contextmanager
def cd(path):
"""Context manager that restores PWD even if an exception was raised."""