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Serve gate-size test files from FUSE instead of disk#67

merged1
feat/gate-1-ledger
feat/gate-2-synthfile
openedOct 2, 2026byAAviddaram
2 files changed
View on GitHubTwo-way sync enabledPR last imported 20d ago

A 100 or 350 GB gate needs a file that size, and the box running it has 19 GB free.

tools/synthfile.py is a ~100-line read-only FUSE mount (mfusepy, run with uv run --script). It serves one file of any size. Each byte comes from AES-256-CTR at that offset, so the file takes no disk and reads back identically every time. The modified time is fixed from the CLI, so a second mount with --flip <offset> is the impostor: same name, size and mtime, one byte different. That's the only way to reach the per-part MD5 check behind the sampled fingerprint.

text
1mountSynthFile({ dir, name, size, seed, mtimeMs, flip? }) scoped: spawn, wait for the size, unmount on exit
2sha256File(path) streams 8 MiB reads, ~670 MB/s here

Requires fuse3 and uv. Pins: mfusepy==3.1.1, cryptography==50.0.1.

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  • Add the synthetic FUSE file for gate-size uploads310d49d
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