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build-runlog-index: explicit tail range for private data repos (LAB-227) #293

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build-runlog-index: explicit tail range for private data repos (LAB-227) #293

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6 changes: 5 additions & 1 deletion scripts/build-runlog-index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -189,7 +189,11 @@ def main_github(repo, branch, write, only):
head, tail = head_tail(text)
else:
head = _raw_range(repo, branch, it['path'], f'bytes=0-{HEAD_BYTES-1}')
tail = _raw_range(repo, branch, it['path'], f'bytes=-{TAIL_BYTES}') if it['size'] > TAIL_BYTES else head
# Explicit start-end, never a suffix range (`bytes=-N`): on a PRIVATE repo the
# token-authenticated raw host answers suffix ranges with "501 Unsupported
# client range" (arena-experiments, 2026-11-04), while the public course repo
# accepted them. The size comes from the contents listing, so no probe needed.
tail = _raw_range(repo, branch, it['path'], f"bytes={it['size'] - TAIL_BYTES}-{it['size'] - 1}") if it['size'] > TAIL_BYTES else head
runs.append(bookends(it['path'], it['size'], head, tail, err))
index = {'format_version': 1, 'folder': name, 'generated': 'scripts/build-runlog-index.py', 'runs': runs}
total += len(runs)
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