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annotate third_party/emsdk/scripts/update_bazel_workspace.py @ 197:0106cb67d958

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author MrJuneJune <me@mrjunejune.com>
date Sat, 14 Feb 2026 16:08:47 -0800
parents 8d17f6e6e290
children
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1 #!/usr/bin/env python3
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2 # This script will update emsdk/bazel/revisions.bzl to the latest version of
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3 # emscripten. It reads emsdk/emscripten-releases-tags.json to get the latest
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4 # version number. Then, it downloads the prebuilts for that version and computes
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5 # the sha256sum for the archive. It then puts all this information into the
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6 # emsdk/bazel/revisions.bzl file.
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8 import hashlib
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9 import json
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10 import os
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11 import re
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12 import sys
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14 import requests
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16 STORAGE_URL = 'https://storage.googleapis.com/webassembly/emscripten-releases-builds'
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18 EMSDK_ROOT = os.path.dirname(os.path.dirname(__file__))
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19 RELEASES_TAGS_FILE = EMSDK_ROOT + '/emscripten-releases-tags.json'
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20 BAZEL_REVISIONS_FILE = EMSDK_ROOT + '/bazel/revisions.bzl'
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21 BAZEL_MODULE_FILE = EMSDK_ROOT + '/bazel/MODULE.bazel'
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24 def get_latest_info():
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25 with open(RELEASES_TAGS_FILE) as f:
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26 info = json.load(f)
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27 latest = info['aliases']['latest']
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28 return latest, info['releases'][latest]
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31 def get_sha(platform, archive_fmt, latest_hash, arch_suffix=''):
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32 r = requests.get(f'{STORAGE_URL}/{platform}/{latest_hash}/wasm-binaries{arch_suffix}.{archive_fmt}')
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33 r.raise_for_status()
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34 print(f'Fetching {r.url}')
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35 h = hashlib.new('sha256')
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36 for chunk in r.iter_content(chunk_size=1024):
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37 h.update(chunk)
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38 return h.hexdigest()
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41 def revisions_item(version, latest_hash):
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42 return f'''\
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43 "{version}": struct(
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44 hash = "{latest_hash}",
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45 sha_linux = "{get_sha('linux', 'tar.xz', latest_hash)}",
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46 sha_linux_arm64 = "{get_sha('linux', 'tar.xz', latest_hash, '-arm64')}",
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47 sha_mac = "{get_sha('mac', 'tar.xz', latest_hash)}",
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48 sha_mac_arm64 = "{get_sha('mac', 'tar.xz', latest_hash, '-arm64')}",
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49 sha_win = "{get_sha('win', 'zip', latest_hash)}",
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50 ),
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51 '''
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54 def insert_revision(item):
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55 with open(BAZEL_REVISIONS_FILE) as f:
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56 lines = f.readlines()
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58 lines.insert(lines.index('EMSCRIPTEN_TAGS = {\n') + 1, item)
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60 with open(BAZEL_REVISIONS_FILE, 'w') as f:
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61 f.write(''.join(lines))
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64 def update_module_version(version):
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65 with open(BAZEL_MODULE_FILE) as f:
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66 content = f.read()
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68 pattern = r'(module\(\s*name = "emsdk",\s*version = )"\d+.\d+.\d+",\n\)'
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69 # Verify that the pattern exists in the input since re.sub will
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70 # will succeed either way.
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71 assert re.search(pattern, content)
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72 content = re.sub(pattern, fr'\1"{version}",\n)', content)
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74 with open(BAZEL_MODULE_FILE, 'w') as f:
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75 f.write(content)
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78 def main():
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79 version, latest_hash = get_latest_info()
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80 update_module_version(version)
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81 item = revisions_item(version, latest_hash)
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82 print('inserting item:')
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83 print(item)
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84 insert_revision(item)
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87 if __name__ == '__main__':
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88 sys.exit(main())