forked from Imagelibrary/littlefs
745b89d02b
Well not really fixed, more just added an assert to make sure lfsr_rbyd_lookup is not called with tag 0. Because our alt tags only encode less-than-or-equal and greater-than, which can be flipped trivially, it's not possible to encode removal of tag 0 during deletes. Fortunately, this tag should already not exist for other pragmatic reasons, it was just used as the initial value for traversals, where it could cause this bug.
702 lines
24 KiB
Python
Executable File
702 lines
24 KiB
Python
Executable File
#!/usr/bin/env python3
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import itertools as it
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import math as m
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import struct
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import bisect
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COLORS = [
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'34', # blue
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'31', # red
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'32', # green
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'35', # purple
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'33', # yellow
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'36', # cyan
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]
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def crc32c(data, crc=0):
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crc ^= 0xffffffff
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for b in data:
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crc ^= b
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for j in range(8):
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crc = (crc >> 1) ^ ((crc & 1) * 0x82f63b78)
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return 0xffffffff ^ crc
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def fromleb128(data):
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word = 0
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for i, b in enumerate(data):
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word |= ((b & 0x7f) << 7*i)
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word &= 0xffffffff
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if not b & 0x80:
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return word, i+1
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return word, len(data)
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def fromtag(data):
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tag, delta = fromleb128(data)
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id, delta_ = fromleb128(data[delta:])
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size, delta__ = fromleb128(data[delta+delta_:])
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return tag&1, tag&~1, id-1, size, delta+delta_+delta__
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def popc(x):
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return bin(x).count('1')
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def xxd(data, width=16, crc=False):
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for i in range(0, len(data), width):
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yield '%-*s %-*s' % (
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3*width,
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' '.join('%02x' % b for b in data[i:i+width]),
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width,
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''.join(
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b if b >= ' ' and b <= '~' else '.'
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for b in map(chr, data[i:i+width])))
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def tagrepr(tag, id, size, off=None):
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if (tag & ~0x3f0) == 0x0400:
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return 'mk%s id%d %d' % (
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'branch' if ((tag & 0x3f0) >> 4) == 0x00
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else 'reg' if ((tag & 0x3f0) >> 4) == 0x01
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else 'dir' if ((tag & 0x3f0) >> 4) == 0x02
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else ' 0x%02x' % ((tag & 0x3f0) >> 4),
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id,
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size)
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elif (tag & ~0x3f0) == 0x0402:
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return 'rm%s id%d%s' % (
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' 0x%02x' % ((tag & 0x3f0) >> 4)
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if ((tag & 0x3f0) >> 4) else '',
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id,
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' %d' % size if size else '')
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elif (tag & ~0xff2) == 0x2000:
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return '%suattr 0x%02x%s%s' % (
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'rm' if tag & 0x2 else '',
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(tag & 0xff0) >> 4,
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' id%d' % id if id != -1 else '',
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' %d' % size if not tag & 0x2 or size else '')
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elif (tag & ~0x10) == 0x24:
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return 'crc%x%s %d' % (
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1 if tag & 0x10 else 0,
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' 0x%02x' % id if id != -1 else '',
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size)
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elif tag == 0x44:
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return 'fcrc%s %d' % (
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' 0x%02x' % id if id != -1 else '',
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size)
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elif tag & 0x8:
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return 'alt%s%s 0x%x w%d %s' % (
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'r' if tag & 0x2 else 'b',
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'gt' if tag & 0x4 else 'le',
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tag & 0x3ff0,
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id+1,
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'0x%x' % (0xffffffff & (off-size))
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if off is not None
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else '-%d' % off)
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else:
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return '0x%04x id%d %d' % (tag, id-1, size)
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def show_log(block_size, data, rev, off, *,
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color=False,
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**args):
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crc = crc32c(data[0:4])
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# preprocess jumps
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if args.get('jumps'):
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jumps = []
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j_ = 4
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while j_ < (block_size if args.get('all') else off):
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j = j_
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v, tag, id, size, delta = fromtag(data[j_:])
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j_ += delta
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if not tag & 0x8:
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j_ += size
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if tag & 0x8:
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# figure out which alt color
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if tag & 0x2:
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_, ntag, _, _, _ = fromtag(data[j_:])
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if ntag & 0x2:
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jumps.append((j, j-size, 0, 'y'))
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else:
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jumps.append((j, j-size, 0, 'r'))
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else:
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jumps.append((j, j-size, 0, 'b'))
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# figure out x-offsets to avoid collisions between jumps
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for j in range(len(jumps)):
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a, b, _, c = jumps[j]
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x = 0
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while any(
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max(a, b) >= min(a_, b_)
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and max(a_, b_) >= min(a, b)
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and x == x_
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for a_, b_, x_, _ in jumps[:j]):
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x += 1
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jumps[j] = a, b, x, c
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def jumprepr(j):
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# render jumps
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chars = {}
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for a, b, x, c in jumps:
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c_start = (
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'\x1b[33m' if color and c == 'y'
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else '\x1b[31m' if color and c == 'r'
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else '\x1b[90m' if color
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else '')
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c_stop = '\x1b[m' if color else ''
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if j == a:
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for x_ in range(2*x+1):
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chars[x_] = '%s-%s' % (c_start, c_stop)
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chars[2*x+1] = '%s\'%s' % (c_start, c_stop)
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elif j == b:
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for x_ in range(2*x+1):
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chars[x_] = '%s-%s' % (c_start, c_stop)
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chars[2*x+1] = '%s.%s' % (c_start, c_stop)
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chars[0] = '%s<%s' % (c_start, c_stop)
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elif j >= min(a, b) and j <= max(a, b):
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chars[2*x+1] = '%s|%s' % (c_start, c_stop)
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return ''.join(chars.get(x, ' ')
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for x in range(max(chars.keys(), default=0)+1))
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# preprocess lifetimes
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if args.get('lifetimes'):
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weight = 0
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max_weight = 0
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lifetimes = {}
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ids = []
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ids_i = 0
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j_ = 4
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while j_ < (block_size if args.get('all') else off):
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j = j_
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v, tag, id, size, delta = fromtag(data[j_:])
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j_ += delta
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if not tag & 0x8:
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j_ += size
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if (tag & ~0x3f0) == 0x0400:
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weight += 1
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max_weight = max(max_weight, weight)
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ids.insert(id, COLORS[ids_i % len(COLORS)])
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ids_i += 1
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lifetimes[j] = (
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''.join(
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'%s%s%s' % (
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'\x1b[%sm' % ids[id_] if color else '',
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'.' if id_ == id
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else '\ ' if id_ > id
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else '| ',
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'\x1b[m' if color else '')
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for id_ in range(weight))
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+ ' ',
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weight)
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elif ((tag & ~0x3f0) == 0x0402 and id < len(ids)):
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lifetimes[j] = (
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''.join(
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'%s%s%s' % (
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'\x1b[%sm' % ids[id_] if color else '',
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'\'' if id_ == id
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else '/ ' if id_ > id
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else '| ',
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'\x1b[m' if color else '')
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for id_ in range(weight))
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+ ' ',
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weight)
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weight -= 1
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ids.pop(id)
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else:
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lifetimes[j] = (
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''.join(
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'%s%s%s' % (
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'\x1b[%sm' % ids[id_] if color else '',
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'* ' if not tag & 0x8
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and id_ == id
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else '| ',
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'\x1b[m' if color else '')
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for id_ in range(weight)),
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weight)
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def lifetimerepr(j):
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lifetime, weight = lifetimes.get(j, ('', 0))
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return '%s%*s' % (lifetime, 2*(max_weight-weight), '')
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# print header
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print('%-8s %s%-22s %s' % (
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'off',
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lifetimerepr(0) if args.get('lifetimes') else '',
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'tag',
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'data (truncated)'
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if not args.get('no_truncate') else ''))
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# print revision count
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if args.get('raw'):
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print('%8s: %s' % ('%04x' % 0, next(xxd(data[0:4]))))
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# print tags
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j_ = 4
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while j_ < (block_size if args.get('all') else off):
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notes = []
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j = j_
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v, tag, id, size, delta = fromtag(data[j_:])
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if v != (popc(crc) & 1):
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notes.append('v!=%x' % (popc(crc) & 1))
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tag &= ~1
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crc = crc32c(data[j_:j_+delta], crc)
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j_ += delta
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if not tag & 0x8:
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if (tag & ~0x10) != 0x24:
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crc = crc32c(data[j_:j_+size], crc)
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# found a crc?
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else:
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crc_, = struct.unpack('<I', data[j_:j_+4].ljust(4, b'\0'))
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if crc != crc_:
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notes.append('crc!=%08x' % crc)
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j_ += size
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# show human-readable tag representation
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print('%s%08x:%s %s%s%-57s%s%s' % (
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'\x1b[90m' if color and j >= off else '',
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j,
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'\x1b[m' if color and j >= off else '',
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lifetimerepr(j) if args.get('lifetimes') else '',
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'\x1b[90m' if color and j >= off else '',
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'%-22s%s' % (
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tagrepr(tag, id, size, j),
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' %s' % next(xxd(
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data[j+delta:j+delta+min(size, 8)], 8), '')
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if not args.get('no_truncate')
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and not tag & 0x8 else ''),
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'\x1b[m' if color and j >= off else '',
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' (%s)' % ', '.join(notes) if notes
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else ' %s' % jumprepr(j)
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if args.get('jumps')
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else ''))
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if args.get('raw'):
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# show on-disk encoding of tags
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for o, line in enumerate(xxd(data[j:j+delta])):
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print('%s%8s: %s%s' % (
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'\x1b[90m' if color and j >= off else '',
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'%04x' % (j + o*16),
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line,
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'\x1b[m' if color and j >= off else ''))
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# show in-device representation, including some extra
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# crc/parity info
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if args.get('device'):
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print('%s%8s %s%-47s %08x %x%s' % (
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'\x1b[90m' if color and j >= off else '',
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'',
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lifetimerepr(0) if args.get('lifetimes') else '',
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'%-22s%s' % (
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'%04x %08x %07x' % (tag, 0xffffffff & id, size),
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' %s' % ' '.join(
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'%08x' % struct.unpack('<I',
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data[j+delta+i*4:j+delta+min(i*4+4,size)]
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.ljust(4, b'\0'))
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for i in range(min(m.ceil(size/4), 3)))[:23]
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if not tag & 0x8 else ''),
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crc,
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popc(crc) & 1,
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'\x1b[m' if color and j >= off else ''))
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if not tag & 0x8:
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# show on-disk encoding of data
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if args.get('raw') or args.get('no_truncate'):
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for o, line in enumerate(xxd(data[j+delta:j+delta+size])):
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print('%s%8s: %s%s' % (
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'\x1b[90m' if color and j >= off else '',
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'%04x' % (j+delta + o*16),
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line,
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'\x1b[m' if color and j >= off else ''))
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def show_tree(block_size, data, rev, trunk, weight, *,
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color=False,
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**args):
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if trunk is None:
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return
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# lookup a tag, returning also the search path for decoration
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# purposes
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def lookup(tag, id):
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lower = -1
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upper = weight
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path = []
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# descend down tree
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j = trunk
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while True:
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_, alt, weight_, jump, delta = fromtag(data[j:])
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# found an alt?
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if alt & 0x8:
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weight_ += 1
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# follow?
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if ((id, tag & ~0xf) > (upper-weight_-1, alt & ~0xf)
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if alt & 0x4
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else ((id, tag & ~0xf) <= (lower+weight_, alt & ~0xf))):
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lower += upper-lower-1-weight_ if alt & 0x4 else 0
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upper -= upper-lower-1-weight_ if not alt & 0x4 else 0
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j = j - jump
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if args.get('tree'):
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# figure out which color
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if alt & 0x2:
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_, nalt, _, _, _ = fromtag(data[j+jump+delta:])
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if nalt & 0x2:
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path.append((j+jump, j, 'y'))
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else:
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path.append((j+jump, j, 'r'))
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else:
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path.append((j+jump, j, 'b'))
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# stay on path
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else:
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lower += weight_ if not alt & 0x4 else 0
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upper -= weight_ if alt & 0x4 else 0
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j = j + delta
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if args.get('tree'):
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# figure out which color
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if alt & 0x2:
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_, nalt, _, _, _ = fromtag(data[j:])
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if nalt & 0x2:
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path.append((j-delta, j, 'y'))
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else:
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path.append((j-delta, j, 'r'))
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else:
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path.append((j-delta, j, 'b'))
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# found tag
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else:
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tag_ = alt
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id_ = upper-1
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done = (id_, tag_) < (id, tag) or tag_ & 2
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return done, tag_, id_, j, delta, jump, path
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# precompute tree
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if args.get('tree'):
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tags = []
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paths = {}
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tag, id = 0, -1
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while True:
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done, tag, id, j, delta, size, path = lookup(tag+0x10, id)
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# found end of tree?
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if done:
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break
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tags.append((j, tag, id))
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for x, (a, b, c) in enumerate(path):
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paths[a, b, x] = c
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# align paths to nearest tag
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tags.sort()
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paths = {(
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tags[bisect.bisect_left(tags, (a, 0, -1), hi=len(tags)-1)],
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tags[bisect.bisect_left(tags, (b, 0, -1), hi=len(tags)-1)],
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x): c for (a, b, x), c in paths.items()}
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# also find the maximum depth
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depth = max((x+1 for _, _, x in paths.keys()), default=0)
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def treerepr(j):
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if depth == 0:
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return ''
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_, tag, id = tags[bisect.bisect_left(
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tags, (j, 0, -1), hi=len(tags)-1)]
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def c_start(c):
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return ('\x1b[33m' if color and c == 'y'
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else '\x1b[31m' if color and c == 'r'
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else '\x1b[90m' if color
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else '')
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def c_stop(c):
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return '\x1b[m' if color else ''
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path = []
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seen = None
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for x in range(depth):
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if any(x == x_ and tag == a_tag and id == a_id
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for (_, a_tag, a_id), _, x_ in paths.keys()):
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c = next(c
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for ((_, a_tag, a_id), _, x_), c in paths.items()
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if x == x_ and tag == a_tag and id == a_id)
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path.append('%s+%s' % (c_start(c), c_stop(c)))
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elif any(x == x_ and tag == b_tag and id == b_id
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for _, (_, b_tag, b_id), x_ in paths.keys()):
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a_tag, a_id, c = next((a_tag, a_id, c)
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for ((_, a_tag, a_id), (_, b_tag, b_id), x_), c
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in paths.items()
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if x == x_ and tag == b_tag and id == b_id)
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if (a_id, a_tag) < (id, tag):
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path.append('%s\'%s' % (c_start(c), c_stop(c)))
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else:
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path.append('%s.%s' % (c_start(c), c_stop(c)))
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elif any(x == x_
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and (id, tag) >= min((a_id, a_tag), (b_id, b_tag))
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and (id, tag) <= max((a_id, a_tag), (b_id, b_tag))
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for (_, a_tag, a_id), (_, b_tag, b_id), x_
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in paths.keys()):
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c = next(c
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for ((_, a_tag, a_id), (_, b_tag, b_id), x_), c
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in paths.items()
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if x == x_
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and (id, tag) >= min((a_id, a_tag), (b_id, b_tag))
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and (id, tag) <= max((a_id, a_tag), (b_id, b_tag)))
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path.append('%s|%s' % (c_start(c), c_stop(c)))
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elif seen:
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path.append('%s-%s' % (c_start(seen), c_stop(seen)))
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else:
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path.append(' ')
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if any(x == x_ and tag == b_tag and id == b_id
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for _, (_, b_tag, b_id), x_ in paths.keys()):
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c = next(c
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for (_, (_, b_tag, b_id), x_), c in paths.items()
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if x == x_ and tag == b_tag and id == b_id)
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seen = c
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if seen and x == depth-1:
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path.append('%s>%s' % (c_start(seen), c_stop(seen)))
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elif seen:
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path.append('%s-%s' % (c_start(seen), c_stop(seen)))
|
|
else:
|
|
path.append(' ')
|
|
|
|
return ' %s' % ''.join(path)
|
|
|
|
# print header
|
|
print('%-8s %*s%-22s %s' % (
|
|
'off',
|
|
2*depth+1 if args.get('tree') and depth > 0 else 0, '',
|
|
'tag',
|
|
'data (truncated)'
|
|
if not args.get('no_truncate') else ''))
|
|
|
|
tag, id = 0, -1
|
|
while True:
|
|
done, tag, id, j, delta, size, path = lookup(tag+0x10, id)
|
|
# found end of tree?
|
|
if done:
|
|
break
|
|
|
|
# show human-readable tag representation
|
|
print('%08x:%s %-57s' % (
|
|
j,
|
|
treerepr(j) if args.get('tree') else '',
|
|
'%-22s%s' % (
|
|
tagrepr(tag, id, size, j),
|
|
' %s' % next(xxd(
|
|
data[j+delta:j+delta+min(size, 8)], 8), '')
|
|
if not args.get('no_truncate')
|
|
and not tag & 0x8 else '')))
|
|
|
|
if args.get('raw'):
|
|
# show on-disk encoding of tags
|
|
for o, line in enumerate(xxd(data[j:j+delta])):
|
|
print('%8s: %s' % (
|
|
'%04x' % (j + o*16),
|
|
line))
|
|
|
|
# show in-device representation, including some extra
|
|
# crc/parity info
|
|
if args.get('device'):
|
|
print('%8s %s%-47s' % (
|
|
'',
|
|
lifetimerepr(0) if args.get('lifetimes') else '',
|
|
'%-22s%s' % (
|
|
'%04x %08x %07x' % (tag, 0xffffffff & id, size),
|
|
' %s' % ' '.join(
|
|
'%08x' % struct.unpack('<I',
|
|
data[j+delta+i*4:j+delta+min(i*4+4,size)]
|
|
.ljust(4, b'\0'))
|
|
for i in range(min(m.ceil(size/4), 3)))[:23]
|
|
if not tag & 0x8 else '')))
|
|
|
|
if not tag & 0x8:
|
|
# show on-disk encoding of data
|
|
if args.get('raw') or args.get('no_truncate'):
|
|
for o, line in enumerate(xxd(data[j+delta:j+delta+size])):
|
|
print('%8s: %s' % (
|
|
'%04x' % (j+delta + o*16),
|
|
line))
|
|
|
|
|
|
def main(disk, block_size, block1, block2=None, *,
|
|
trunk=None,
|
|
color='auto',
|
|
**args):
|
|
# figure out what color should be
|
|
if color == 'auto':
|
|
color = sys.stdout.isatty()
|
|
elif color == 'always':
|
|
color = True
|
|
else:
|
|
color = False
|
|
|
|
# read each block
|
|
blocks = [block for block in [block1, block2] if block is not None]
|
|
with open(disk, 'rb') as f:
|
|
datas = []
|
|
for block in blocks:
|
|
f.seek(block * block_size)
|
|
datas.append(f.read(block_size))
|
|
|
|
# first figure out which block as the most recent revision
|
|
def fetch(data):
|
|
rev, = struct.unpack('<I', data[0:4].ljust(4, b'\0'))
|
|
crc = crc32c(data[0:4])
|
|
off = 0
|
|
j_ = 4
|
|
trunk = None
|
|
trunk_ = None
|
|
weight = 0
|
|
weight_ = 0
|
|
wastrunk = False
|
|
while j_ < block_size:
|
|
v, tag, id, size, delta = fromtag(data[j_:])
|
|
if v != (popc(crc) & 1):
|
|
break
|
|
crc = crc32c(data[j_:j_+delta], crc)
|
|
j_ += delta
|
|
|
|
if not wastrunk and (tag & 0xc) != 0x4:
|
|
trunk_ = j_ - delta
|
|
wastrunk = True
|
|
|
|
if not tag & 0x8:
|
|
if (tag & ~0x10) != 0x24:
|
|
crc = crc32c(data[j_:j_+size], crc)
|
|
# keep track of weight
|
|
if (tag & ~0x3f0) == 0x0400:
|
|
weight_ += 1
|
|
elif (tag & ~0x3f0) == 0x0402:
|
|
weight_ = max(weight_ - 1, 0)
|
|
# found a crc?
|
|
else:
|
|
crc_, = struct.unpack('<I', data[j_:j_+4].ljust(4, b'\0'))
|
|
if crc != crc_:
|
|
break
|
|
# commit what we have
|
|
off = j_ + size
|
|
trunk = trunk_
|
|
weight = weight_
|
|
j_ += size
|
|
wastrunk = False
|
|
|
|
return rev, off, trunk, weight
|
|
|
|
revs, offs, trunks, weights = [], [], [], []
|
|
i = 0
|
|
for block, data in zip(blocks, datas):
|
|
rev, off, trunk_, weight = fetch(data)
|
|
revs.append(rev)
|
|
offs.append(off)
|
|
trunks.append(trunk_)
|
|
weights.append(weight)
|
|
|
|
# compare with sequence arithmetic
|
|
if off and ((rev - revs[i]) & 0x80000000):
|
|
i = len(revs)-1
|
|
|
|
# print contents of the winning metadata block
|
|
block, data, rev, off, trunk, weight = (
|
|
blocks[i], datas[i], revs[i], offs[i],
|
|
trunk if trunk is not None else trunks[i],
|
|
weights[i])
|
|
|
|
print('mdir 0x%x, rev %d, size %d, weight %d%s' % (
|
|
block, rev, off, weight,
|
|
' (was 0x%x, %d, %d, %d)' % (
|
|
blocks[~i], revs[~i], offs[~i], weights[~i])
|
|
if len(blocks) > 1 else ''))
|
|
|
|
if args.get('log'):
|
|
show_log(block_size, data, rev, off,
|
|
color=color,
|
|
**args)
|
|
else:
|
|
show_tree(block_size, data, rev, trunk, weight,
|
|
color=color,
|
|
**args)
|
|
|
|
if args.get('error_on_corrupt') and off == 0:
|
|
sys.exit(2)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import argparse
|
|
import sys
|
|
parser = argparse.ArgumentParser(
|
|
description="Debug rbyd metadata.",
|
|
allow_abbrev=False)
|
|
parser.add_argument(
|
|
'disk',
|
|
help="File containing the block device.")
|
|
parser.add_argument(
|
|
'block_size',
|
|
type=lambda x: int(x, 0),
|
|
help="Block size in bytes.")
|
|
parser.add_argument(
|
|
'block1',
|
|
type=lambda x: int(x, 0),
|
|
help="Block address of the first metadata block.")
|
|
parser.add_argument(
|
|
'block2',
|
|
nargs='?',
|
|
type=lambda x: int(x, 0),
|
|
help="Block address of the second metadata block.")
|
|
parser.add_argument(
|
|
'--trunk',
|
|
type=lambda x: int(x, 0),
|
|
help="Use this offset as the trunk of the tree.")
|
|
parser.add_argument(
|
|
'--color',
|
|
choices=['never', 'always', 'auto'],
|
|
default='auto',
|
|
help="When to use terminal colors. Defaults to 'auto'.")
|
|
parser.add_argument(
|
|
'-a', '--all',
|
|
action='store_true',
|
|
help="Don't stop parsing on bad commits.")
|
|
parser.add_argument(
|
|
'-l', '--log',
|
|
action='store_true',
|
|
help="Show the raw tags as they appear in the log.")
|
|
parser.add_argument(
|
|
'-r', '--raw',
|
|
action='store_true',
|
|
help="Show the raw data including tag encodings.")
|
|
parser.add_argument(
|
|
'-x', '--device',
|
|
action='store_true',
|
|
help="Show the device-side representation of tags.")
|
|
parser.add_argument(
|
|
'-T', '--no-truncate',
|
|
action='store_true',
|
|
help="Don't truncate, show the full contents.")
|
|
parser.add_argument(
|
|
'-t', '--tree',
|
|
action='store_true',
|
|
help="Show the rbyd tree.")
|
|
parser.add_argument(
|
|
'-j', '--jumps',
|
|
action='store_true',
|
|
help="Show alt pointer jumps in the margin.")
|
|
parser.add_argument(
|
|
'-g', '--lifetimes',
|
|
action='store_true',
|
|
help="Show inserts/deletes of ids in the margin.")
|
|
parser.add_argument(
|
|
'-e', '--error-on-corrupt',
|
|
action='store_true',
|
|
help="Error if no valid commit is found.")
|
|
sys.exit(main(**{k: v
|
|
for k, v in vars(parser.parse_intermixed_args()).items()
|
|
if v is not None}))
|