107 lines
4 KiB
Python
107 lines
4 KiB
Python
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#!/usr/bin/env python3
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"""Walk linux-firmware git history for MediaTek Connac2 WiFi blobs.
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For every revision of every mt79*_wm/wa/rom_patch/wo file, extract
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version-recovering metadata (kernel trailer date, hidden build string,
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region table) and emit JSONL. Metadata only — no blob bytes are stored.
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Usage: python3 tools/fw_history.py [linux-firmware-repo] -o dataset/history.jsonl
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"""
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import argparse
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import hashlib
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import json
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import re
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import subprocess
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import struct
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import sys
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from pathlib import Path
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sys.path.insert(0, str(Path(__file__).resolve().parent))
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from mtk_fw_extract import PATCH_HDR, REGION, TRAILER # noqa: E402
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TARGET_RE = re.compile(r'^mediatek/mt79(15|16|81|86)_(wm|wa|rom_patch|wo(_[01])?)\.bin$')
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def git(repo, *args, binary=False):
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r = subprocess.run(['git', '-C', str(repo), *args], capture_output=True)
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if r.returncode:
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raise RuntimeError(r.stderr.decode())
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return r.stdout if binary else r.stdout.decode()
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def peek_ram(d: bytes) -> dict:
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t = TRAILER.unpack_from(d, len(d) - TRAILER.size)
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chip, eco, n = t[0], t[1], t[2]
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bdate = t[7].decode(errors='replace')
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table = len(d) - TRAILER.size - n * REGION.size
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off, addrs, feats = 0, [], []
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for i in range(n):
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r = REGION.unpack_from(d, table + i * REGION.size)
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addrs.append(f'0x{r[4]:08x}')
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feats.append(f'0x{r[6]:02x}')
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off += r[5]
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hidden = None
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gap = table - off
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if gap > 0:
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runs = [x.strip(b'#') for x in re.findall(rb'[\x20-\x7e]{8,}', d[off:table])]
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runs = [x for x in runs if len(x) >= 8]
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hidden = runs[0].decode() if runs else None
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return {'chip_id': chip, 'eco': eco, 'n_region': n,
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'trailer_fw_ver': t[6].decode(errors='replace'),
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'trailer_date': bdate, 'hidden': hidden,
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'region_addrs': addrs, 'region_feats': feats, 'gap': gap}
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def peek_patch(d: bytes) -> dict:
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h = PATCH_HDR.unpack_from(d, 0)
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n = h[9]
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return {'platform': h[1].decode(errors='replace'),
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'patch_date': h[0].decode(errors='replace').strip('\x00'),
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'hw_sw_ver': f'0x{h[2]:08x}', 'n_section': n}
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def main():
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ap = argparse.ArgumentParser()
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ap.add_argument('repo', nargs='?', default='firmware/linux-firmware')
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ap.add_argument('-o', '--out', default='dataset/history.jsonl')
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args = ap.parse_args()
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repo = Path(args.repo)
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head = git(repo, 'rev-parse', 'HEAD').strip()
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files = [f for f in git(repo, 'ls-tree', '-r', '--name-only', 'HEAD',
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'mediatek').splitlines()
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if TARGET_RE.match(f)]
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out = Path(args.out)
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out.parent.mkdir(parents=True, exist_ok=True)
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n_rev = 0
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with out.open('w') as fh:
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for f in sorted(files):
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log = git(repo, 'log', '--format=%H%x00%cs%x00%s', '--', f)
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revs = [l.split('\x00') for l in log.strip().splitlines()]
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for commit, date, subject in reversed(revs): # oldest first
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d = git(repo, 'cat-file', 'blob', f'{commit}:{f}', binary=True)
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rec = {'file': f, 'commit': commit[:12], 'date': date,
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'subject': subject, 'repo_head': head[:12],
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'sha256': hashlib.sha256(d).hexdigest()[:16],
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'size': len(d)}
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try:
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if '_rom_patch' in f:
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rec.update(peek_patch(d))
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elif '_wo' in f:
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rec['format'] = 'wed-wo (unsupported parser)'
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else:
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rec.update(peek_ram(d))
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except Exception as e: # noqa: BLE001
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rec['parse_error'] = str(e)
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fh.write(json.dumps(rec) + '\n')
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n_rev += 1
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hv = rec.get('hidden') or rec.get('patch_date') or ''
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print(f"{f.split('/')[-1]:26s} {date} {commit[:8]} "
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f"{rec.get('trailer_date', rec.get('patch_date', '?'))} "
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f"{hv[:60]}")
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print(f'--- {n_rev} revisions -> {out}')
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if __name__ == '__main__':
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main()
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