129 lines
6.4 KiB
Python
129 lines
6.4 KiB
Python
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# -*- coding: utf-8 -*-
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"""按「角色」切负载：replace（只负责替换）/ restore（只负责还原）。
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为什么拆成两张盘
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----------------
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「负载 + 回滚」合在一张盘 = 两份 15.5 MB ≈ 31 MB，超过 .face 的体积上限。
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拆开之后每张盘只装一份负载（≈15.5 MB）。
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拆盘后版本校验怎么办
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--------------------
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每张盘再带一张**指纹表**：每条记录存「另一侧字节的前 64 B」。
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* replace 盘：pay = q63 的帧（新字节）；fp = **原厂字节**前 64 B
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* restore 盘：pay = 原厂字节； fp = **新字节**前 64 B
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于是「写入前版本校验」和「写入后回读比对」两道保险都还在，代价只有 119*64 ≈ 7.4 KB。
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关键约定（S4e 那版踩过的坑）
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----------------------------
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Lua 表里存的是**分区键名**（'health'），运行期才由 `DEVS[键]` 拼成 `/dev/health`。
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若把 '/dev/health' 直接存进表里，拼出来就是 `if=nil` 或 `if=/dev//dev/health`。
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产出
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----
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payload/ NNN_<name>.bin + payload.lua （replace 盘的负载）
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payload_restore/ NNN_<name>.bin + payload.lua （restore 盘的负载）
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blob_replace/ payload.bin（魔数 + 顺序拼接）+ fp.bin + offsets.json
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blob_restore/ 同上
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payload.json 机器可读清单
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"""
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import os, sys, json, hashlib, struct
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sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
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from paths import PROJ, WORK, TARGET_IMAGE
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ROLE = (sys.argv[1] if len(sys.argv) > 1 else 'replace').lower()
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assert ROLE in ('replace', 'restore'), ROLE
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PATCHED = os.path.join(WORK, 'anim', 'vela_health_anim.bin')
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OUT = PROJ
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DEV = 'health' # ← Lua 表里的键名（不是 '/dev/health'）
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FP_LEN = 64
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recs_in = json.load(open(os.path.join(WORK, 'anim', 'manifest.json'), encoding='utf-8'))
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stock = open(TARGET_IMAGE, 'rb').read()
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patched = open(PATCHED, 'rb').read()
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assert len(stock) == len(patched), '改后镜像长度变了 —— 等长覆盖的前提被破坏'
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assert stock[:8] == b'-rom1fs-'
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SRC = patched if ROLE == 'replace' else stock # 要写进设备的字节
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OTHER = stock if ROLE == 'replace' else patched # 另一侧字节（做指纹）
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FPDIR = os.path.join(OUT, 'payload' if ROLE == 'replace' else 'payload_restore')
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BLOBDIR = os.path.join(OUT, 'blob_' + ROLE)
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records = []
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for r in recs_in['records']:
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off, ln = r['offset'], r['length']
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records.append(dict(name=r['name'], offset=off, length=ln, data=SRC[off:off + ln],
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changed=(stock[off:off + ln] != patched[off:off + ln]),
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fp=OTHER[off:off + FP_LEN]))
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# replace 盘跳过「本来就没变」的记录（省体积）；restore 盘一条都不能少
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emitted = [r for r in records if (r['changed'] or ROLE == 'restore')]
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dropped = [r for r in records if r not in emitted]
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for r in emitted:
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assert len(r['data']) == r['length'], r['name']
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assert len(r['fp']) == FP_LEN, r['name']
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def write_pack(d):
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os.makedirs(d, exist_ok=True)
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for f in os.listdir(d):
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os.remove(os.path.join(d, f))
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rows = []
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for i, r in enumerate(emitted):
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fn = '%03d_%s.bin' % (i, r['name'])
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open(os.path.join(d, fn), 'wb').write(r['data'])
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assert r['offset'] % 4 == 0, r['name']
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rows.append(dict(name=r['name'], file=fn, offset=r['offset'], length=r['length']))
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with open(os.path.join(d, 'payload.lua'), 'w', encoding='utf-8', newline='\n') as f:
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f.write('-- generated by tools/s5e_payload.py (%s) -- do not hand-edit\n' % ROLE)
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f.write('-- dd: -if <this dir>/<file> -of /dev/%s bs=4 seek=offset/4 count=length/4\n' % DEV)
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f.write('return {\n')
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for r in rows:
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f.write(' { name = "%s", file = "%s", offset = %d, length = %d },\n'
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% (r['name'], r['file'], r['offset'], r['length']))
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f.write('}\n')
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return rows
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lua_rows = write_pack(FPDIR)
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# 魔数必须全局唯一，且**长度不要手写常量**（S4e/S5e 图标包都因为手写成 16 导致偏移差 1）
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MAGIC_PAY = b'\x00S5P-PAYv1\x00\xa5\x5a\xc3\x3c'
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MAGIC_FP = b'\x00S5P-FPv1\x00\x5a\xa5\x3c\xc3'
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os.makedirs(BLOBDIR, exist_ok=True)
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for f in os.listdir(BLOBDIR):
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os.remove(os.path.join(BLOBDIR, f))
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pay_blob = MAGIC_PAY + b''.join(r['data'] for r in emitted)
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fp_blob = MAGIC_FP + b''.join(r['fp'] for r in emitted)
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open(os.path.join(BLOBDIR, 'payload.bin'), 'wb').write(pay_blob)
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open(os.path.join(BLOBDIR, 'fp.bin'), 'wb').write(fp_blob)
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rel, off, fpoff = [], 0, 0
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for r in emitted:
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# 每条都存独立 sha256：.face 构建时用它校验"确实原样连续存放"，
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# 而不是拿 .face 跟自己比（那种检查恒真、抓不到 bug）
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rel.append(dict(name=r['name'], rel=off, fprel=fpoff, target=r['offset'],
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length=r['length'], fplen=len(r['fp']),
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pay_sha=hashlib.sha256(pay_blob[len(MAGIC_PAY) + off:
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len(MAGIC_PAY) + off + r['length']]).hexdigest(),
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fp_sha=hashlib.sha256(fp_blob[len(MAGIC_FP) + fpoff:
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len(MAGIC_FP) + fpoff + len(r['fp'])]).hexdigest()))
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off += r['length']
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fpoff += len(r['fp'])
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assert fpoff == len(fp_blob) - len(MAGIC_FP), (fpoff, len(fp_blob))
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assert off == len(pay_blob) - len(MAGIC_PAY), (off, len(pay_blob))
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json.dump(dict(role=ROLE, device=DEV, magic_len=len(MAGIC_PAY), magic_fp_len=len(MAGIC_FP),
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fp_len=FP_LEN, records=rel, pay_bytes=len(pay_blob), fp_bytes=len(fp_blob),
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dropped_identical=[r['name'] for r in dropped]),
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open(os.path.join(BLOBDIR, 'offsets.json'), 'w', encoding='utf-8'), indent=1)
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print('blob_%s/ 单条目: payload.bin %d B + fp.bin %d B（%d 条记录，跳过 %d 条未变）'
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% (ROLE, len(pay_blob), len(fp_blob), len(rel), len(dropped)))
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json.dump(dict(device='Xiaomi Watch S5 eSIM 46mm (p62lte)', target='/dev/' + DEV, dev_key=DEV,
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partition='vela_health.bin', role=ROLE, kind='pressure-measure-anim',
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dd='dd if=<dir>/<file> of=/dev/%s bs=4 seek=<offset/4> count=<length/4>' % DEV,
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block_size=4, records=lua_rows,
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dropped_identical=[r['name'] for r in dropped]),
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open(os.path.join(OUT, 'payload.json'), 'w', encoding='utf-8'), indent=1,
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ensure_ascii=False)
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total = sum(r['length'] for r in lua_rows)
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print('role=%s: emitted %d records, %.2f MB; dropped %d'
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% (ROLE, len(lua_rows), total / 1048576, len(dropped)))
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