c7305b4045
* Always output a tarball from cc_binary to simplify logic. This will change the result of --config=wasm builds that were previously outputting a single file. * better to use early return here * Always output a tarball from cc_binary to simplify logic. This will change the result of --config=wasm builds that were previously outputting a single file. * better to use early return here Co-authored-by: Mitch Foley <mitchfoley@chromium.org>
67 lines
2.2 KiB
Python
67 lines
2.2 KiB
Python
"""Unpackages a bazel emscripten archive for use in a bazel BUILD rule.
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This script will take a tar archive containing the output of the emscripten
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toolchain. This file contains any output files produced by a wasm_cc_binary or a
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cc_binary built with --config=wasm. The files are extracted into the given
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output path.
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The name of archive is expected to be of the format `foo` or `foo.XXX` and
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the contents are expected to be foo.js and foo.wasm.
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Several optional files may also be in the archive, including but not limited to
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foo.js.mem, pthread-main.js, and foo.wasm.map.
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If the file is not a tar archive, the passed file will simply be copied to its
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destination.
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This script and its accompanying Bazel rule should allow you to extract a
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WebAssembly binary into a larger web application.
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"""
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import argparse
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import os
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import subprocess
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def ensure(f):
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if not os.path.exists(f):
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with open(f, 'w'):
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pass
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def check(f):
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if not os.path.exists(f):
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raise Exception('Expected file in archive: %s' % f)
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('--archive', help='The archive to extract from.')
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parser.add_argument('--output_path', help='The path to extract into.')
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args = parser.parse_args()
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basename = os.path.basename(args.archive)
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stem = basename.split('.')[0]
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# Extract all files from the tarball.
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subprocess.check_call(
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['tar', 'xf', args.archive, '-C', args.output_path])
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# At least one of these two files should exist at this point.
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ensure(os.path.join(args.output_path, stem + '.js'))
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ensure(os.path.join(args.output_path, stem + '.wasm'))
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# And can optionally contain these extra files.
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ensure(os.path.join(args.output_path, stem + '.wasm.map'))
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ensure(os.path.join(args.output_path, stem + '.worker.js'))
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ensure(os.path.join(args.output_path, stem + '.js.mem'))
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ensure(os.path.join(args.output_path, stem + '.data'))
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ensure(os.path.join(args.output_path, stem + '.fetch.js'))
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ensure(os.path.join(args.output_path, stem + '.js.symbols'))
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ensure(os.path.join(args.output_path, stem + '.wasm.debug.wasm'))
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ensure(os.path.join(args.output_path, stem + '.html'))
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if __name__ == '__main__':
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main()
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