forked from Imagelibrary/littlefs
8f26b68af2
I only recently noticed there is enough information in each rbyd trunk to infer the effective grow/shrinks. This has a number of benefits: - Cleans up the tag encoding a bit, no longer expecting tag size to sometimes contain a weight (though this could've been fixed other ways). 0x6 in the lower nibble now reserved exclusively for in-device tags. - grow/shrinks can be implicit to any tag. Will attempt to leverage this in the future. - The weight of an rbyd can no longer go out-of-sync with itself. While this _shouldn't_ happen normally, if it does I imagine it'd be very hard to debug. Now, there is only one source of knowledge about the weight of the rbyd: The most recent set of alt-pointers. Note that remove/unreachable tags now behave _very_ differently when it comes to weight calculation, remove tags require the tree to make the tag unreachable. This is a tradeoff for the above.
894 lines
30 KiB
Python
Executable File
894 lines
30 KiB
Python
Executable File
#!/usr/bin/env python3
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import bisect
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import itertools as it
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import math as m
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import os
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import struct
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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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TAG_UNREACHABLE = 0x0002
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TAG_NAME = 0x1000
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TAG_BNAME = 0x1000
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TAG_REG = 0x1010
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TAG_DIR = 0x1020
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TAG_STRUCT = 0x3000
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TAG_INLINED = 0x3000
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TAG_BLOCK = 0x3100
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TAG_BRANCH = 0x3200
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TAG_BTREE = 0x3300
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TAG_UATTR = 0x4000
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TAG_ALT = 0x0008
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TAG_CRC = 0x0004
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TAG_FCRC = 0x1004
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def blocklim(s):
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if '.' in s:
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s = s.strip()
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b = 10
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if s.startswith('0x') or s.startswith('0X'):
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s = s[2:]
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b = 16
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elif s.startswith('0o') or s.startswith('0O'):
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s = s[2:]
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b = 8
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elif s.startswith('0b') or s.startswith('0B'):
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s = s[2:]
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b = 2
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s0, s1 = s.split('.', 1)
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return int(s0, b), int(s1, b)
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else:
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return int(s, 0)
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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 fromle16(data):
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if len(data) < 2:
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return 0
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return struct.unpack('<H', data[:2])[0]
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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 = fromle16(data)
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id, delta = fromleb128(data[2:])
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size, delta_ = fromleb128(data[2+delta:])
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return tag&1, tag&~1, id if tag&0x8 else id-1, size, 2+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 & 0xfffe) == TAG_UNREACHABLE:
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return 'unreachable id%d%s' % (
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id,
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' %d' % size if size else '')
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elif (tag & 0xf00c) == TAG_NAME:
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return '%s%s id%d %d' % (
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'rm' if tag & 0x2 else '',
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'bname' if (tag & 0xfffe) == TAG_BNAME
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else 'reg' if (tag & 0xfffe) == TAG_REG
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else 'dir' if (tag & 0xfffe) == TAG_DIR
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else 'name 0x%02x' % ((tag & 0x0ff0) >> 4),
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id,
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size)
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elif (tag & 0xf00c) == TAG_STRUCT:
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return '%s%s id%d %d' % (
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'rm' if tag & 0x2 else '',
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'inlined' if (tag & 0xfffe) == TAG_INLINED
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else 'block' if (tag & 0xfffe) == TAG_BLOCK
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else 'branch' if (tag & 0xfffe) == TAG_BRANCH
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else 'btree' if (tag & 0xfffe) == TAG_BTREE
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else 'struct 0x%02x' % ((tag & 0x0ff0) >> 4),
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id,
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size)
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elif (tag & 0xf00c) == TAG_UATTR:
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return '%suattr 0x%02x%s%s' % (
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'rm' if tag & 0x2 else '',
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(tag & 0x0ff0) >> 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 & 0xf00e) == TAG_CRC:
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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 & 0xfffe) == TAG_FCRC:
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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 & 0xfff0,
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id,
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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, 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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lifetime_width = 0
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if args.get('lifetimes'):
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class Lifetime:
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color_i = 0
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def __init__(self, j):
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self.origin = j
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self.tags = set()
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self.color = COLORS[self.__class__.color_i]
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self.__class__.color_i = (
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self.__class__.color_i + 1) % len(COLORS)
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def add(self, j):
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self.tags.add(j)
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def __bool__(self):
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return bool(self.tags)
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# first figure out where each id comes from
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weights = []
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lifetimes = []
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def index(weights, id):
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for i, w in enumerate(weights):
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if id < w:
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return i, id
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id -= w
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return len(weights), 0
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checkpoint_js = [0]
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checkpoints = [([], [], set(), set(), set())]
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def checkpoint(j, weights, lifetimes, grows, shrinks, tags):
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checkpoint_js.append(j)
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checkpoints.append((
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weights.copy(), lifetimes.copy(),
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grows, shrinks, tags))
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lower_, upper_ = 0, 0
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weight_ = 0
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wastrunk = False
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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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# find trunk
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if not wastrunk and (tag & 0xc) != 0x4:
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lower_, upper_ = 0, 0
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wastrunk = not not tag & 0x8
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# keep track of weight
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if tag & 0x8:
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if tag & 0x4:
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upper_ += id
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else:
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lower_ += id
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elif (tag & 0xc) == 0x0:
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delta = (lower_+upper_) - weight_
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if not tag & 0x2:
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delta += id+1-lower_
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weight_ += delta
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# note we ignore out-of-bounds here for debugging
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if delta > 0:
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# grow lifetimes
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i, id_ = index(weights, lower_)
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if id_ > 0:
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weights[i:i+1] = [id_, delta, weights[i]-id_]
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lifetimes[i:i+1] = [
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lifetimes[i], Lifetime(j), lifetimes[i]]
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else:
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weights[i:i] = [delta]
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lifetimes[i:i] = [Lifetime(j)]
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checkpoint(j, weights, lifetimes, {i}, set(), {i})
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elif delta < 0:
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# shrink lifetimes
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i, id_ = index(weights, lower_)
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delta_ = -delta
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weights_ = weights.copy()
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lifetimes_ = lifetimes.copy()
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shrinks = set()
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while delta_ > 0 and i < len(weights_):
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if id_ > 0:
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delta__ = min(delta_, weights_[i]-id_)
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delta_ -= delta__
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weights_[i] -= delta__
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i += 1
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id_ = 0
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elif weights_[i] > delta_:
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weights_[i] -= delta_
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size_ = 0
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else:
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delta_ -= weights_[i]
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weights_[i:i+1] = []
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lifetimes_[i:i+1] = []
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shrinks.add(i + len(shrinks))
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checkpoint(j, weights, lifetimes, set(), shrinks, {i})
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weights = weights_
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lifetimes = lifetimes_
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if not tag & 0x2:
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# attach tag to lifetime
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i, id_ = index(weights, lower_)
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if i < len(weights):
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lifetimes[i].add(j)
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if delta == 0:
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checkpoint(j, weights, lifetimes, set(), set(), {i})
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lifetime_width = 2*max((
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sum(1 for lifetime in lifetimes if lifetime)
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for _, lifetimes, _, _, _ in checkpoints),
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default=0)
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def lifetimerepr(j):
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x = bisect.bisect(checkpoint_js, j)-1
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j_ = checkpoint_js[x]
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weights, lifetimes, grows, shrinks, tags = checkpoints[x]
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reprs = []
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colors = []
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was = None
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for i, (w, lifetime) in enumerate(zip(weights, lifetimes)):
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# skip lifetimes with no tags and shrinks
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if not lifetime or (j != j_ and i in shrinks):
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if i in grows or i in shrinks or i in tags:
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tags = tags.copy()
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tags.add(i+1)
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continue
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if j == j_ and i in grows:
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reprs.append('.')
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was = 'grow'
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elif j == j_ and i in shrinks:
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reprs.append('\'')
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was = 'shrink'
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elif j == j_ and i in tags:
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reprs.append('* ')
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elif was == 'grow':
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reprs.append('\\ ')
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elif was == 'shrink':
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reprs.append('/ ')
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else:
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reprs.append('| ')
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colors.append(lifetime.color)
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return '%s%*s' % (
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''.join('%s%s%s' % (
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'\x1b[%sm' % c if color else '',
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r,
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'\x1b[m' if color else '')
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for r, c in zip(reprs, colors)),
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lifetime_width - sum(len(r) for r in reprs), '')
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# print header
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print('%-8s %*s%-22s %s' % (
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'off',
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lifetime_width, '',
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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 & 0xf00f) != TAG_CRC:
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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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lifetime_width, '',
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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 args.get('no_truncate')
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and 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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# follow?
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if ((id, tag & ~0xf) > (upper-weight_-1, alt & ~0xf)
|
|
if alt & 0x4
|
|
else ((id, tag & ~0xf) <= (lower+weight_, alt & ~0xf))):
|
|
lower += upper-lower-1-weight_ if alt & 0x4 else 0
|
|
upper -= upper-lower-1-weight_ if not alt & 0x4 else 0
|
|
j = j - jump
|
|
|
|
if args.get('tree'):
|
|
# figure out which color
|
|
if alt & 0x2:
|
|
_, nalt, _, _, _ = fromtag(data[j+jump+delta:])
|
|
if nalt & 0x2:
|
|
path.append((j+jump, j, 'y'))
|
|
else:
|
|
path.append((j+jump, j, 'r'))
|
|
else:
|
|
path.append((j+jump, j, 'b'))
|
|
# stay on path
|
|
else:
|
|
lower += weight_ if not alt & 0x4 else 0
|
|
upper -= weight_ if alt & 0x4 else 0
|
|
j = j + delta
|
|
|
|
if args.get('tree'):
|
|
# figure out which color
|
|
if alt & 0x2:
|
|
_, nalt, _, _, _ = fromtag(data[j:])
|
|
if nalt & 0x2:
|
|
path.append((j-delta, j, 'y'))
|
|
else:
|
|
path.append((j-delta, j, 'r'))
|
|
else:
|
|
path.append((j-delta, j, 'b'))
|
|
# found tag
|
|
else:
|
|
tag_ = alt
|
|
id_ = upper-1
|
|
w_ = id_-lower
|
|
|
|
done = (id_, tag_) < (id, tag) or tag_ & 2
|
|
|
|
return done, tag_, id_, w_, j, delta, jump, path
|
|
|
|
# precompute tree
|
|
tree_width = 0
|
|
if args.get('tree'):
|
|
tags = []
|
|
paths = {}
|
|
|
|
tag, id = 0, -1
|
|
while True:
|
|
done, tag, id, w, j, delta, size, path = lookup(tag+0x10, id)
|
|
# found end of tree?
|
|
if done:
|
|
break
|
|
|
|
tags.append((j, tag, id))
|
|
for x, (a, b, c) in enumerate(path):
|
|
paths[a, b, x] = c
|
|
|
|
# align paths to nearest tag
|
|
tags.sort()
|
|
paths = {(
|
|
tags[bisect.bisect_left(tags, (a, 0, -1), hi=len(tags)-1)],
|
|
tags[bisect.bisect_left(tags, (b, 0, -1), hi=len(tags)-1)],
|
|
x): c for (a, b, x), c in paths.items()}
|
|
|
|
# also find the maximum depth
|
|
depth = max((x+1 for _, _, x in paths.keys()), default=0)
|
|
if depth > 0:
|
|
tree_width = 2*depth + 2
|
|
|
|
def treerepr(j):
|
|
if depth == 0:
|
|
return ''
|
|
|
|
_, tag, id = tags[bisect.bisect_left(
|
|
tags, (j, 0, -1), hi=len(tags)-1)]
|
|
|
|
def c_start(c):
|
|
return ('\x1b[33m' if color and c == 'y'
|
|
else '\x1b[31m' if color and c == 'r'
|
|
else '\x1b[90m' if color
|
|
else '')
|
|
|
|
def c_stop(c):
|
|
return '\x1b[m' if color else ''
|
|
|
|
path = []
|
|
seen = None
|
|
for x in range(depth):
|
|
if any(x == x_ and tag == a_tag and id == a_id
|
|
for (_, a_tag, a_id), _, x_ in paths.keys()):
|
|
c = next(c
|
|
for ((_, a_tag, a_id), _, x_), c in paths.items()
|
|
if x == x_ and tag == a_tag and id == a_id)
|
|
path.append('%s+%s' % (c_start(c), c_stop(c)))
|
|
elif any(x == x_ and tag == b_tag and id == b_id
|
|
for _, (_, b_tag, b_id), x_ in paths.keys()):
|
|
a_tag, a_id, c = next((a_tag, a_id, c)
|
|
for ((_, a_tag, a_id), (_, b_tag, b_id), x_), c
|
|
in paths.items()
|
|
if x == x_ and tag == b_tag and id == b_id)
|
|
if (a_id, a_tag) < (id, tag):
|
|
path.append('%s\'%s' % (c_start(c), c_stop(c)))
|
|
else:
|
|
path.append('%s.%s' % (c_start(c), c_stop(c)))
|
|
elif any(x == x_
|
|
and (id, tag) >= min((a_id, a_tag), (b_id, b_tag))
|
|
and (id, tag) <= max((a_id, a_tag), (b_id, b_tag))
|
|
for (_, a_tag, a_id), (_, b_tag, b_id), x_
|
|
in paths.keys()):
|
|
c = next(c
|
|
for ((_, a_tag, a_id), (_, b_tag, b_id), x_), c
|
|
in paths.items()
|
|
if x == x_
|
|
and (id, tag) >= min((a_id, a_tag), (b_id, b_tag))
|
|
and (id, tag) <= max((a_id, a_tag), (b_id, b_tag)))
|
|
path.append('%s|%s' % (c_start(c), c_stop(c)))
|
|
elif seen:
|
|
path.append('%s-%s' % (c_start(seen), c_stop(seen)))
|
|
else:
|
|
path.append(' ')
|
|
|
|
if any(x == x_ and tag == b_tag and id == b_id
|
|
for _, (_, b_tag, b_id), x_ in paths.keys()):
|
|
c = next(c
|
|
for (_, (_, b_tag, b_id), x_), c in paths.items()
|
|
if x == x_ and tag == b_tag and id == b_id)
|
|
seen = c
|
|
|
|
if seen and x == depth-1:
|
|
path.append('%s->%s' % (c_start(seen), c_stop(seen)))
|
|
elif seen:
|
|
path.append('%s-%s' % (c_start(seen), c_stop(seen)))
|
|
else:
|
|
path.append(' ')
|
|
|
|
return ' %s' % ''.join(path)
|
|
|
|
# print header
|
|
w_width = 2*m.ceil(m.log10(max(1, weight)+1))+1
|
|
print('%-8s %*s%-*s %-22s %s' % (
|
|
'off',
|
|
tree_width, '',
|
|
w_width, 'ids',
|
|
'tag',
|
|
'data (truncated)'
|
|
if not args.get('no_truncate') else ''))
|
|
|
|
tag, id = 0, -1
|
|
while True:
|
|
done, tag, id, w, j, delta, size, path = lookup(tag+0x10, id)
|
|
# found end of tree?
|
|
if done:
|
|
break
|
|
|
|
# show human-readable tag representation
|
|
print('%08x:%s %*s %-57s' % (
|
|
j,
|
|
treerepr(j) if args.get('tree') else '',
|
|
w_width, '%d-%d' % (id-(w-1), id)
|
|
if w > 1 else id
|
|
if w > 0 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 '')))
|
|
|
|
# show in-device representation
|
|
if args.get('device'):
|
|
print('%8s %*s%*s %s' % (
|
|
'',
|
|
tree_width, '',
|
|
w_width, '',
|
|
'%-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 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))
|
|
|
|
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=None, block1=0, block2=None, *,
|
|
limit=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
|
|
|
|
with open(disk, 'rb') as f:
|
|
# if block_size is omitted, assume the block device is one big block
|
|
if block_size is None:
|
|
f.seek(0, os.SEEK_END)
|
|
block_size = f.tell()
|
|
|
|
# blocks may also encode limits
|
|
blocks = [
|
|
block[0] if isinstance(block, tuple) else block
|
|
for block in [block1, block2]
|
|
if block is not None]
|
|
limits = [
|
|
limit if limit is not None
|
|
else block[1] if isinstance(block, tuple)
|
|
else None
|
|
for block in [block1, block2]
|
|
if block is not None]
|
|
|
|
# read each block
|
|
datas = []
|
|
for block, limit in zip(blocks, limits):
|
|
f.seek(block * block_size)
|
|
datas.append(f.read(limit if limit is not None else 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
|
|
lower_, upper_ = 0, 0
|
|
weight_ = 0
|
|
wastrunk = False
|
|
while j_ < len(data):
|
|
v, tag, id, size, delta = fromtag(data[j_:])
|
|
if v != (popc(crc) & 1):
|
|
break
|
|
crc = crc32c(data[j_:j_+delta], crc)
|
|
j_ += delta
|
|
|
|
# find trunk
|
|
if not wastrunk and (tag & 0xc) != 0x4:
|
|
trunk_ = j_ - delta
|
|
lower_, upper_ = 0, 0
|
|
wastrunk = not not tag & 0x8
|
|
|
|
# keep track of weight
|
|
if tag & 0x8:
|
|
if tag & 0x4:
|
|
upper_ += id
|
|
else:
|
|
lower_ += id
|
|
elif (tag & 0xc) == 0x0:
|
|
weight_ = lower_+upper_
|
|
if not tag & 0x2:
|
|
weight_ += id+1-lower_
|
|
|
|
# take care of crcs
|
|
if not tag & 0x8:
|
|
if (tag & 0xf00f) != TAG_CRC:
|
|
crc = crc32c(data[j_:j_+size], crc)
|
|
# 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
|
|
|
|
return rev, off, trunk, weight
|
|
|
|
revs, offs, trunks, weights = [], [], [], []
|
|
i = 0
|
|
for data in 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, limit, data, rev, off, trunk, weight = (
|
|
blocks[i], limits[i], datas[i], revs[i], offs[i],
|
|
trunk if trunk is not None else trunks[i],
|
|
weights[i])
|
|
|
|
print('rbyd 0x%x%s, rev %d, size %d, weight %d%s' % (
|
|
block, '.%x' % limit if limit is not None else '',
|
|
rev, off, weight,
|
|
' (was 0x%x%s, %d, %d, %d)' % (
|
|
blocks[~i], '.%x' % limits[~i] if limits[~i] is not None else '',
|
|
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(
|
|
'block1',
|
|
nargs='?',
|
|
type=blocklim,
|
|
help="Block address of the first metadata block.")
|
|
parser.add_argument(
|
|
'block2',
|
|
nargs='?',
|
|
type=blocklim,
|
|
help="Block address of the second metadata block.")
|
|
parser.add_argument(
|
|
'-B', '--block-size',
|
|
type=lambda x: int(x, 0),
|
|
help="Block size in bytes.")
|
|
parser.add_argument(
|
|
'-L', '--limit',
|
|
type=lambda x: int(x, 0),
|
|
help="Use this offset as the rbyd limit.")
|
|
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}))
|