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bpo-45231: update_file.py preserves end of line (GH-28411)
The update_file.py tool now preserves the end of line of the updated file. Fix the "make regen-frozen" command: it no longer changes the end of line of PCbuild/ files on Unix. Git changes the end of line depending on the platform.
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@ -28,7 +28,19 @@ def updating_file_with_tmpfile(filename, tmpfile=None):
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elif os.path.isdir(tmpfile):
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tmpfile = os.path.join(tmpfile, filename + '.tmp')
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with open(tmpfile, 'w') as outfile:
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with open(filename, 'rb') as infile:
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line = infile.readline()
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if line.endswith(b'\r\n'):
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newline = "\r\n"
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elif line.endswith(b'\r'):
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newline = "\r"
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elif line.endswith(b'\n'):
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newline = "\n"
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else:
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raise ValueError(f"unknown end of line: {filename}: {line!a}")
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with open(tmpfile, 'w', newline=newline) as outfile:
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with open(filename) as infile:
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yield infile, outfile
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update_file_with_tmpfile(filename, tmpfile)
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