mirror of https://github.com/zulip/zulip.git
34 lines
1.2 KiB
Python
Executable File
34 lines
1.2 KiB
Python
Executable File
#!/usr/bin/env python3
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import io
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import sys
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import tarfile
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stdin = getattr(sys.stdin, 'buffer', sys.stdin)
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stdout = getattr(sys.stdout, 'buffer', sys.stdout)
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try:
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progname, old_shebang, new_shebang = sys.argv
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except ValueError:
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sys.exit("usage: replace-tarball-shebang '#!OLDSHEBANG' '#!NEWSHEBANG' < IN.tar[.gz] > OUT.tar")
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old_shebang_bytes = old_shebang.encode()
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new_shebang_bytes = new_shebang.encode()
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with tarfile.open(fileobj=stdin, mode='r|*') as in_tar, \
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tarfile.open(fileobj=stdout, mode='w', format=tarfile.PAX_FORMAT, pax_headers=in_tar.pax_headers) as out_tar:
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for info in in_tar:
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if info.isfile():
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file = in_tar.extractfile(info)
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assert(file is not None) # this assert convinces mypy that it's okay to do file.read()
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data = file.read()
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if data.startswith(old_shebang_bytes + b' ') or data.startswith(old_shebang_bytes + b'\n'):
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print('editing', info.name, file=sys.stderr)
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assert info.size == len(data)
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data = new_shebang_bytes + data[len(old_shebang_bytes):]
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info.size = len(data)
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out_tar.addfile(info, io.BytesIO(data))
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else:
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out_tar.addfile(info)
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