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annotate third_party/emsdk/bazel/emscripten_toolchain/wasm_binary.py @ 198:008ca7780c8a

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S3 upload got it to work.
author MrJuneJune <me@mrjunejune.com>
date Sat, 14 Feb 2026 16:18:14 -0800
parents 8d17f6e6e290
children
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1 """Unpackages a bazel emscripten archive for use in a bazel BUILD rule.
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3 This script will take a tar archive containing the output of the emscripten
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4 toolchain. This file contains any output files produced by a wasm_cc_binary or a
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5 cc_binary built with --config=wasm. The files are extracted into the given
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6 output paths.
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8 The contents of the archive are expected to match the given outputs extnames.
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10 This script and its accompanying Bazel rule should allow you to extract a
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11 WebAssembly binary into a larger web application.
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12 """
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14 import argparse
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15 import os
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16 import tarfile
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19 def ensure(f):
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20 if not os.path.exists(f):
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21 with open(f, 'w'):
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22 pass
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25 def main():
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26 parser = argparse.ArgumentParser()
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27 parser.add_argument('--archive', help='The archive to extract from.')
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28 parser.add_argument('--outputs', help='Comma separated list of files that should be extracted from the archive. Only the extname has to match a file in the archive.')
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29 parser.add_argument('--allow_empty_outputs', help='If an output listed in --outputs does not exist, create it anyways.', action='store_true')
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30 args = parser.parse_args()
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32 args.archive = os.path.normpath(args.archive)
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33 args.outputs = args.outputs.split(",")
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35 tar = tarfile.open(args.archive)
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37 for member in tar.getmembers():
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38 extname = '.' + member.name.split('.', 1)[1]
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39 for idx, output in enumerate(args.outputs):
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40 if output.endswith(extname):
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41 member_file = tar.extractfile(member)
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42 with open(output, "wb") as output_file:
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43 output_file.write(member_file.read())
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44 args.outputs.pop(idx)
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45 break
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47 for output in args.outputs:
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48 extname = '.' + output.split('.', 1)[1]
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49 if args.allow_empty_outputs:
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50 ensure(output)
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51 else:
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52 print("[ERROR] Archive does not contain file with extname: %s" % extname)
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55 if __name__ == '__main__':
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56 main()