Christopher Haster
1044c9d2b7
I've been scratching my head over our rbyd perturb scheme. It's gotten
rather clunky with needing to xor valid bits and whatnot.
But it's tricky with needing erased-state to be included in parity bits,
while at the same time excluded from our canonical checksum. If only
there was some way to flip the checksums parity without changing its
value...
Enter the crc32c odd-parity zero: 0xfca42daf!
This bends the definition of zero a bit, but it is one of two numbers in
our crc32c-ring with a very interesting property:
crc32c(m) == crc32c(m xor 0xfca42daf) xor 0xfca42daf // odd-p zero
crc32c(m) == crc32c(m xor 0x00000000) xor 0x00000000 // even-p zero
Recall that crc32c's polynomial, 0x11edc6f41, is composed of two
polynomials: 0x3, the parity polynomial, and 0xf5b4253f, a maximally
sized irreducible polynomial. Because our polynomial breaks down into
two smaller polynomials, our crc32c space turns out to not be a field,
but rather a ring containing two smaller sub-fields. Because these
sub-fields are defined by their polynomials, one is the 31-bit crc
defined by the polynomial 0xf5b4253f, while the other is the current
parity.
We can move in the parity sub-field without changing our position in the
31-bit crc sub-field by xoring with a number that is one in the parity
sub-field, but zero in the 31-bit crc sub-field.
This number happens to be 0xf5b4253f (0xfca42daf bit-reversed)!
(crcs being bit-reversed will never not be annoying)
So long story short, xoring any crc32c with 0xfca42daf will change its
parity but not its value.
---
An that's basically our new perturb scheme. If we need to perturb, xor
with 0xfca42daf to change the parity, and after calculating/validating
the checksum, xor with 0xfca42daf to get our canonical checksum.
Isn't that neat!
There was one small hiccup: At first I assumed you could continue
including the valid bits in the checksum, which would have been nice for
bulk checksumming. But this doesn't work because while valid bits cancel
out so the parity doesn't change, changing valid bits _does_ change the
underlying 31-bit crc, poisoning our checksum and making everything a
mess.
So we still need to mask out valid bits, which is a bit annoying.
But then I stumbled on the funny realization that by masking our valid
bits, we accidentally end up with a fully functional parity scheme.
Because valid bits _don't_ include the previous valid bit, we can figure
out the parity for not only the entire commit, but also each individual
tag:
80 03 00 08 6c 69 74 74 6c 65 66 73 80
^'----------------.---------------' ^
| | |
v + parity = v'
Or more simply:
80 03 00 08 6c 69 74 74 6c 65 66 73 80
'----------------.----------------' ^
| |
parity = v'
Double neat!
Some other notes:
- By keeping the commit checksum perturbed, but not the canonical
checksum, the perturb state is self-validating. We no longer need to
explicitly check the previous-perturb-bit (q) to avoid the perturb
hole we ran into previously.
I'm still keeping the previous-perturb-bit (q) around, since it's
useful for debugging. We still need to know the perturb state
internally at all times in order to xor out the canonical checksum
correctly anyways.
- Thanks to all of our perturb iterations, we now know how to remove the
valid bits from the checksum easily:
cksum ^= 0x00000080 & (tag >> 8)
This makes the whole omitting-valid-bits thing less of a pain point.
- It wasn't actually worth it to perturb the checksum when building
commits, vs manually flipping each valid bit, as this would have made
our internal appendattr API really weird.
At least the perturbed checksum made fetch a bit simpler.
Not sure exactly how to draw this with our perturb scheme diagrams,
maybe something like this?
.---+---+---+---. \ \ \ \
|v| tag | | | | |
+---+---+---+---+ | | | |
| commit | | | | |
| | +-. | | |
+---+---+---+---+ / | | | |
|v|qp-------------->p>p-->p .
+---+---+---+---+ | . . .
| cksum | | . . .
+---+---+---+---+ | . . .
| padding | | . . .
| | | . . .
+---+---+---+---+ | | | |
|v------------------' | | |
+---+---+---+---+ | | |
| commit | +-. | +- rbyd
| | | | | | cksum
+---+---+---+---+ / | +-. /
|v----------------------' | |
+-------+---+---+ / |
| cksum ----------------'
+---+---+---+---+
| padding |
| |
+---+---+---+---+
| erased |
| |
. .
. .
---
Code changes were minimal, saving a tiny bit of code:
code stack
before: 36368 2664
after: 36352 (-0.0%) 2672 (+0.3%)
There was a stack bump in lfsr_bd_readtag, but as far as I can tell it's
just compiler noise? I poked around a bit but couldn't figure out why it
changed...
1135 lines
38 KiB
Python
Executable File
1135 lines
38 KiB
Python
Executable File
#!/usr/bin/env python3
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import bisect
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import collections as co
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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_NULL = 0x0000 ## 0x0000 v--- ---- ---- ----
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TAG_CONFIG = 0x0000 ## 0x00tt v--- ---- -ttt tttt
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TAG_MAGIC = 0x0003 # 0x0003 v--- ---- ---- --11
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TAG_VERSION = 0x0004 # 0x0004 v--- ---- ---- -1--
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TAG_RCOMPAT = 0x0005 # 0x0005 v--- ---- ---- -1-1
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TAG_WCOMPAT = 0x0006 # 0x0006 v--- ---- ---- -11-
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TAG_OCOMPAT = 0x0007 # 0x0007 v--- ---- ---- -111
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TAG_GEOMETRY = 0x0009 # 0x0008 v--- ---- ---- 1-rr
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TAG_NAMELIMIT = 0x000c # 0x000c v--- ---- ---- 11--
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TAG_FILELIMIT = 0x000d # 0x000d v--- ---- ---- 11-1
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TAG_GDELTA = 0x0100 ## 0x01tt v--- ---1 -ttt tttt
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TAG_GRMDELTA = 0x0100 # 0x0100 v--- ---1 ---- ----
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TAG_NAME = 0x0200 ## 0x02tt v--- --1- -ttt tttt
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TAG_REG = 0x0201 # 0x0201 v--- --1- ---- ---1
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TAG_DIR = 0x0202 # 0x0202 v--- --1- ---- --1-
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TAG_BOOKMARK = 0x0204 # 0x0204 v--- --1- ---- -1--
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TAG_ORPHAN = 0x0205 # 0x0205 v--- --1- ---- -1-1
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TAG_STRUCT = 0x0300 ## 0x03tt v--- --11 -ttt tttt
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TAG_DATA = 0x0300 # 0x0300 v--- --11 ---- ----
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TAG_BLOCK = 0x0304 # 0x0304 v--- --11 ---- -1rr
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TAG_BSHRUB = 0x0308 # 0x0308 v--- --11 ---- 1---
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TAG_BTREE = 0x030c # 0x030c v--- --11 ---- 11rr
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TAG_MROOT = 0x0311 # 0x0310 v--- --11 ---1 --rr
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TAG_MDIR = 0x0315 # 0x0314 v--- --11 ---1 -1rr
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TAG_MTREE = 0x031c # 0x031c v--- --11 ---1 11rr
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TAG_DID = 0x0320 # 0x0320 v--- --11 --1- ----
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TAG_BRANCH = 0x032c # 0x032c v--- --11 --1- 11rr
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TAG_UATTR = 0x0400 # 0x04aa v--- -1-a -aaa aaaa
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TAG_SATTR = 0x0600 # 0x06aa v--- -11a -aaa aaaa
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TAG_SHRUB = 0x1000 ## 0x1kkk v--1 kkkk -kkk kkkk
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TAG_ALT = 0x4000 ## 0x4kkk v1cd kkkk -kkk kkkk
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TAG_B = 0x0000
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TAG_R = 0x2000
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TAG_LE = 0x0000
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TAG_GT = 0x1000
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TAG_CKSUM = 0x3000 ## 0x3c0p v-11 cccc ---- --qp
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TAG_P = 0x0001
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TAG_Q = 0x0002
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TAG_NOTE = 0x3100 # 0x3100 v-11 ---1 ---- ----
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TAG_ECKSUM = 0x3200 # 0x3200 v-11 --1- ---- ----
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# some ways of block geometry representations
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# 512 -> 512
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# 512x16 -> (512, 16)
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# 0x200x10 -> (512, 16)
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def bdgeom(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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if 'x' in s:
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s, s_ = s.split('x', 1)
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return (int(s, b), int(s_, b))
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else:
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return int(s, b)
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# parse some rbyd addr encodings
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# 0xa -> [0xa]
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# 0xa.c -> [(0xa, 0xc)]
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# 0x{a,b} -> [0xa, 0xb]
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# 0x{a,b}.c -> [(0xa, 0xc), (0xb, 0xc)]
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def rbydaddr(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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trunk = None
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if '.' in s:
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s, s_ = s.split('.', 1)
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trunk = int(s_, b)
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if s.startswith('{') and '}' in s:
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ss = s[1:s.find('}')].split(',')
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else:
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ss = [s]
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addr = []
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for s in ss:
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if trunk is not None:
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addr.append((int(s, b), trunk))
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else:
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addr.append(int(s, b))
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return addr
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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 popc(x):
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return bin(x).count('1')
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def parity(x):
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return popc(x) & 1
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def fromle32(data):
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return struct.unpack('<I', data[0:4].ljust(4, b'\0'))[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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data = data.ljust(4, b'\0')
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tag = (data[0] << 8) | data[1]
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weight, d = fromleb128(data[2:])
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size, d_ = fromleb128(data[2+d:])
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return tag>>15, tag&0x7fff, weight, size, 2+d+d_
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def xxd(data, width=16):
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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, w=None, size=None, off=None):
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if (tag & 0x6fff) == TAG_NULL:
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return '%snull%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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' w%d' % w if w else '',
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' %d' % size if size else '')
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elif (tag & 0x6f00) == TAG_CONFIG:
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return '%s%s%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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'magic' if (tag & 0xfff) == TAG_MAGIC
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else 'version' if (tag & 0xfff) == TAG_VERSION
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else 'rcompat' if (tag & 0xfff) == TAG_RCOMPAT
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else 'wcompat' if (tag & 0xfff) == TAG_WCOMPAT
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else 'ocompat' if (tag & 0xfff) == TAG_OCOMPAT
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else 'geometry' if (tag & 0xfff) == TAG_GEOMETRY
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else 'namelimit' if (tag & 0xfff) == TAG_NAMELIMIT
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else 'filelimit' if (tag & 0xfff) == TAG_FILELIMIT
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else 'config 0x%02x' % (tag & 0xff),
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x6f00) == TAG_GDELTA:
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return '%s%s%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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'grmdelta' if (tag & 0xfff) == TAG_GRMDELTA
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else 'gdelta 0x%02x' % (tag & 0xff),
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x6f00) == TAG_NAME:
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return '%s%s%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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'name' if (tag & 0xfff) == TAG_NAME
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else 'reg' if (tag & 0xfff) == TAG_REG
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else 'dir' if (tag & 0xfff) == TAG_DIR
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else 'orphan' if (tag & 0xfff) == TAG_ORPHAN
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else 'bookmark' if (tag & 0xfff) == TAG_BOOKMARK
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else 'name 0x%02x' % (tag & 0xff),
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x6f00) == TAG_STRUCT:
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return '%s%s%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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'data' if (tag & 0xfff) == TAG_DATA
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else 'block' if (tag & 0xfff) == TAG_BLOCK
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else 'bshrub' if (tag & 0xfff) == TAG_BSHRUB
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else 'btree' if (tag & 0xfff) == TAG_BTREE
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else 'mroot' if (tag & 0xfff) == TAG_MROOT
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else 'mdir' if (tag & 0xfff) == TAG_MDIR
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else 'mtree' if (tag & 0xfff) == TAG_MTREE
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else 'did' if (tag & 0xfff) == TAG_DID
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else 'branch' if (tag & 0xfff) == TAG_BRANCH
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else 'struct 0x%02x' % (tag & 0xff),
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x6e00) == TAG_UATTR:
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return '%suattr 0x%02x%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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((tag & 0x100) >> 1) | (tag & 0xff),
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x6e00) == TAG_SATTR:
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return '%ssattr 0x%02x%s%s' % (
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'shrub' if tag & TAG_SHRUB else '',
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((tag & 0x100) >> 1) | (tag & 0xff),
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif tag & TAG_ALT:
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return 'alt%s%s%s%s%s' % (
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'r' if tag & TAG_R else 'b',
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'a' if tag & 0x0fff == 0 and tag & TAG_GT
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else 'n' if tag & 0x0fff == 0
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else 'gt' if tag & TAG_GT
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else 'le',
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' 0x%x' % (tag & 0x0fff) if tag & 0x0fff != 0 else '',
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' w%d' % w if w is not None else '',
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' 0x%x' % (0xffffffff & (off-size))
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if size and off is not None
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else ' -%d' % size if size
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else '')
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elif (tag & 0x7f00) == TAG_CKSUM:
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return 'cksum%s%s%s%s%s' % (
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'q' if not tag & 0xfc and tag & TAG_Q else '',
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'p' if not tag & 0xfc and tag & TAG_P else '',
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' 0x%02x' % (tag & 0xff) if tag & 0xfc else '',
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x7f00) == TAG_NOTE:
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return 'note%s%s%s' % (
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' 0x%02x' % (tag & 0xff) if tag & 0xff else '',
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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elif (tag & 0x7f00) == TAG_ECKSUM:
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return 'ecksum%s%s%s' % (
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' 0x%02x' % (tag & 0xff) if tag & 0xff else '',
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' w%d' % w if w else '',
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' %s' % size if size is not None else '')
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else:
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return '0x%04x%s%s' % (
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tag,
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' w%d' % w if w is not None else '',
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' %d' % size if size is not None else '')
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def dbg_log(data, block_size, rev, eoff, weight, *,
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color=False,
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**args):
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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 eoff):
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j = j_
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v, tag, w, size, d = fromtag(data[j_:])
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j_ += d
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if not tag & TAG_ALT:
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j_ += size
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if tag & TAG_ALT and size:
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# figure out which alt color
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if tag & TAG_R:
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_, ntag, _, _, _ = fromtag(data[j_:])
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if ntag & TAG_R:
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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 rid comes from
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weights = []
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lifetimes = []
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def index(weights, rid):
|
|
for i, w in enumerate(weights):
|
|
if rid < w:
|
|
return i, rid
|
|
rid -= w
|
|
return len(weights), 0
|
|
|
|
checkpoint_js = [0]
|
|
checkpoints = [([], [], set(), set(), set())]
|
|
def checkpoint(j, weights, lifetimes, grows, shrinks, tags):
|
|
checkpoint_js.append(j)
|
|
checkpoints.append((
|
|
weights.copy(), lifetimes.copy(),
|
|
grows, shrinks, tags))
|
|
|
|
lower_, upper_ = 0, 0
|
|
weight_ = 0
|
|
trunk_ = 0
|
|
j_ = 4
|
|
while j_ < (block_size if args.get('all') else eoff):
|
|
j = j_
|
|
v, tag, w, size, d = fromtag(data[j_:])
|
|
j_ += d
|
|
if not tag & TAG_ALT:
|
|
j_ += size
|
|
|
|
# evaluate trunks
|
|
if (tag & 0xf000) != TAG_CKSUM:
|
|
if not trunk_:
|
|
trunk_ = j_-d
|
|
lower_, upper_ = 0, 0
|
|
|
|
if tag & TAG_ALT and not tag & TAG_GT:
|
|
lower_ += w
|
|
else:
|
|
upper_ += w
|
|
|
|
if not tag & TAG_ALT:
|
|
# derive the current tag's rid from alt weights
|
|
delta = (lower_+upper_) - weight_
|
|
weight_ = lower_+upper_
|
|
rid = lower_ + w-1
|
|
trunk_ = 0
|
|
|
|
if (tag & 0xf000) != TAG_CKSUM and not tag & TAG_ALT:
|
|
# note we ignore out-of-bounds here for debugging
|
|
if delta > 0:
|
|
# grow lifetimes
|
|
i, rid_ = index(weights, lower_)
|
|
if rid_ > 0:
|
|
weights[i:i+1] = [rid_, delta, weights[i]-rid_]
|
|
lifetimes[i:i+1] = [
|
|
lifetimes[i], Lifetime(j), lifetimes[i]]
|
|
else:
|
|
weights[i:i] = [delta]
|
|
lifetimes[i:i] = [Lifetime(j)]
|
|
|
|
checkpoint(j, weights, lifetimes, {i}, set(), {i})
|
|
|
|
elif delta < 0:
|
|
# shrink lifetimes
|
|
i, rid_ = index(weights, lower_)
|
|
delta_ = -delta
|
|
weights_ = weights.copy()
|
|
lifetimes_ = lifetimes.copy()
|
|
shrinks = set()
|
|
while delta_ > 0 and i < len(weights_):
|
|
if weights_[i] > delta_:
|
|
delta__ = min(delta_, weights_[i]-rid_)
|
|
delta_ -= delta__
|
|
weights_[i] -= delta__
|
|
i += 1
|
|
rid_ = 0
|
|
else:
|
|
delta_ -= weights_[i]
|
|
weights_[i:i+1] = []
|
|
lifetimes_[i:i+1] = []
|
|
shrinks.add(i + len(shrinks))
|
|
|
|
checkpoint(j, weights, lifetimes, set(), shrinks, {i})
|
|
weights = weights_
|
|
lifetimes = lifetimes_
|
|
|
|
if rid >= 0:
|
|
# attach tag to lifetime
|
|
i, rid_ = index(weights, rid)
|
|
if i < len(weights):
|
|
lifetimes[i].add(j)
|
|
|
|
if delta == 0:
|
|
checkpoint(j, weights, lifetimes, set(), set(), {i})
|
|
|
|
lifetime_width = 2*max((
|
|
sum(1 for lifetime in lifetimes if lifetime)
|
|
for _, lifetimes, _, _, _ in checkpoints),
|
|
default=0)
|
|
|
|
def lifetimerepr(j):
|
|
x = bisect.bisect(checkpoint_js, j)-1
|
|
j_ = checkpoint_js[x]
|
|
weights, lifetimes, grows, shrinks, tags = checkpoints[x]
|
|
|
|
reprs = []
|
|
colors = []
|
|
was = None
|
|
for i, (w, lifetime) in enumerate(zip(weights, lifetimes)):
|
|
# skip lifetimes with no tags and shrinks
|
|
if not lifetime or (j != j_ and i in shrinks):
|
|
if i in grows or i in shrinks or i in tags:
|
|
tags = tags.copy()
|
|
tags.add(i+1)
|
|
continue
|
|
|
|
if j == j_ and i in grows:
|
|
reprs.append('.')
|
|
was = 'grow'
|
|
elif j == j_ and i in shrinks:
|
|
reprs.append('\'')
|
|
was = 'shrink'
|
|
elif j == j_ and i in tags:
|
|
reprs.append('* ')
|
|
elif was == 'grow':
|
|
reprs.append('\\ ')
|
|
elif was == 'shrink':
|
|
reprs.append('/ ')
|
|
else:
|
|
reprs.append('| ')
|
|
|
|
colors.append(lifetime.color)
|
|
|
|
return '%s%*s' % (
|
|
''.join('%s%s%s' % (
|
|
'\x1b[%sm' % c if color else '',
|
|
r,
|
|
'\x1b[m' if color else '')
|
|
for r, c in zip(reprs, colors)),
|
|
lifetime_width - sum(len(r) for r in reprs), '')
|
|
|
|
|
|
# dynamically size the id field
|
|
#
|
|
# we need to do an additional pass to find this since our rbyd weight
|
|
# does not include any shrub trees
|
|
weight_ = 0
|
|
weight__ = 0
|
|
trunk_ = 0
|
|
j_ = 4
|
|
while j_ < (block_size if args.get('all') else eoff):
|
|
j = j_
|
|
v, tag, w, size, d = fromtag(data[j_:])
|
|
j_ += d
|
|
|
|
if not tag & TAG_ALT:
|
|
j_ += size
|
|
|
|
# evaluate trunks
|
|
if (tag & 0xf000) != TAG_CKSUM:
|
|
if not trunk_:
|
|
trunk_ = j_-d
|
|
weight__ = 0
|
|
|
|
weight__ += w
|
|
|
|
if not tag & TAG_ALT:
|
|
# found new weight?
|
|
weight_ = max(weight_, weight__)
|
|
trunk_ = 0
|
|
|
|
w_width = m.ceil(m.log10(max(1, weight_)+1))
|
|
|
|
# print revision count
|
|
if args.get('raw'):
|
|
print('%8s: %*s%*s %s' % (
|
|
'%04x' % 0,
|
|
lifetime_width, '',
|
|
2*w_width+1, '',
|
|
next(xxd(data[0:4]))))
|
|
|
|
# print tags
|
|
cksum = crc32c(data[0:4])
|
|
cksum_ = cksum
|
|
perturb = False
|
|
lower_, upper_ = 0, 0
|
|
trunk_ = 0
|
|
j_ = 4
|
|
while j_ < (block_size if args.get('all') else eoff):
|
|
notes = []
|
|
|
|
# read next tag
|
|
j = j_
|
|
v, tag, w, size, d = fromtag(data[j_:])
|
|
if v != parity(cksum_):
|
|
notes.append('v!=%x' % parity(cksum_))
|
|
cksum_ ^= 0x00000080 if v else 0
|
|
cksum_ = crc32c(data[j_:j_+d], cksum_)
|
|
j_ += d
|
|
|
|
# take care of cksums
|
|
if not tag & TAG_ALT:
|
|
if (tag & 0xff00) != TAG_CKSUM:
|
|
cksum_ = crc32c(data[j_:j_+size], cksum_)
|
|
# found a cksum?
|
|
else:
|
|
# check cksum
|
|
cksum__ = fromle32(data[j_:j_+4])
|
|
if cksum_ != cksum__:
|
|
notes.append('cksum!=%08x' % cksum__)
|
|
if perturb != bool(tag & TAG_Q):
|
|
notes.append('q!=%x' % perturb)
|
|
# update perturb bit
|
|
perturb = tag & TAG_P
|
|
# revert to data cksum and perturb
|
|
cksum_ = cksum ^ (0xfca42daf if perturb else 0)
|
|
j_ += size
|
|
|
|
# evaluate trunks
|
|
if (tag & 0xf000) != TAG_CKSUM:
|
|
if not trunk_:
|
|
trunk_ = j_-d
|
|
lower_, upper_ = 0, 0
|
|
|
|
if tag & TAG_ALT and not tag & TAG_GT:
|
|
lower_ += w
|
|
else:
|
|
upper_ += w
|
|
|
|
# end of trunk?
|
|
if not tag & TAG_ALT:
|
|
# update canonical checksum, xoring out any perturb state
|
|
cksum = cksum_ ^ (0xfca42daf if perturb else 0)
|
|
# derive the current tag's rid from alt weights
|
|
rid = lower_ + w-1
|
|
trunk_ = 0
|
|
|
|
# show human-readable tag representation
|
|
print('%s%08x:%s %*s%s%*s %-*s%s%s%s' % (
|
|
'\x1b[90m' if color and j >= eoff else '',
|
|
j,
|
|
'\x1b[m' if color and j >= eoff else '',
|
|
lifetime_width, lifetimerepr(j) if args.get('lifetimes') else '',
|
|
'\x1b[90m' if color and j >= eoff else '',
|
|
2*w_width+1, '' if (tag & 0xe000) != 0x0000
|
|
else '%d-%d' % (rid-(w-1), rid) if w > 1
|
|
else rid,
|
|
56+w_width, '%-*s %s' % (
|
|
21+w_width, tagrepr(tag, w, size, j),
|
|
next(xxd(data[j+d:j+d+min(size, 8)], 8), '')
|
|
if not args.get('raw') and not args.get('no_truncate')
|
|
and not tag & TAG_ALT else ''),
|
|
' (%s)' % ', '.join(notes) if notes else '',
|
|
'\x1b[m' if color and j >= eoff else '',
|
|
' %s' % jumprepr(j)
|
|
if args.get('jumps') and not notes else ''))
|
|
|
|
# show on-disk encoding of tags
|
|
if args.get('raw'):
|
|
for o, line in enumerate(xxd(data[j:j+d])):
|
|
print('%s%8s: %*s%*s %s%s' % (
|
|
'\x1b[90m' if color and j >= eoff else '',
|
|
'%04x' % (j + o*16),
|
|
lifetime_width, '',
|
|
2*w_width+1, '',
|
|
line,
|
|
'\x1b[m' if color and j >= eoff else ''))
|
|
if args.get('raw') or args.get('no_truncate'):
|
|
if not tag & TAG_ALT:
|
|
for o, line in enumerate(xxd(data[j+d:j+d+size])):
|
|
print('%s%8s: %*s%*s %s%s' % (
|
|
'\x1b[90m' if color and j >= eoff else '',
|
|
'%04x' % (j+d + o*16),
|
|
lifetime_width, '',
|
|
2*w_width+1, '',
|
|
line,
|
|
'\x1b[m' if color and j >= eoff else ''))
|
|
|
|
|
|
def dbg_tree(data, block_size, rev, trunk, weight, *,
|
|
color=False,
|
|
**args):
|
|
if not trunk:
|
|
return
|
|
|
|
# lookup a tag, returning also the search path for decoration
|
|
# purposes
|
|
def lookup(rid, tag):
|
|
tag = max(tag, 0x1)
|
|
lower = 0
|
|
upper = weight
|
|
path = []
|
|
|
|
# descend down tree
|
|
j = trunk
|
|
while True:
|
|
_, alt, w, jump, d = fromtag(data[j:])
|
|
|
|
# found an alt?
|
|
if alt & TAG_ALT:
|
|
# follow?
|
|
if ((rid, tag & 0xfff) > (upper-w-1, alt & 0xfff)
|
|
if alt & TAG_GT
|
|
else ((rid, tag & 0xfff) <= (lower+w-1, alt & 0xfff))):
|
|
lower += upper-lower-w if alt & TAG_GT else 0
|
|
upper -= upper-lower-w if not alt & TAG_GT else 0
|
|
j = j - jump
|
|
|
|
# figure out which color
|
|
if alt & TAG_R:
|
|
_, nalt, _, _, _ = fromtag(data[j+jump+d:])
|
|
if nalt & TAG_R:
|
|
path.append((j+jump, j, True, 'y'))
|
|
else:
|
|
path.append((j+jump, j, True, 'r'))
|
|
else:
|
|
path.append((j+jump, j, True, 'b'))
|
|
|
|
# stay on path
|
|
else:
|
|
lower += w if not alt & TAG_GT else 0
|
|
upper -= w if alt & TAG_GT else 0
|
|
j = j + d
|
|
|
|
# figure out which color
|
|
if alt & TAG_R:
|
|
_, nalt, _, _, _ = fromtag(data[j:])
|
|
if nalt & TAG_R:
|
|
path.append((j-d, j, False, 'y'))
|
|
else:
|
|
path.append((j-d, j, False, 'r'))
|
|
else:
|
|
path.append((j-d, j, False, 'b'))
|
|
|
|
# found tag
|
|
else:
|
|
rid_ = upper-1
|
|
tag_ = alt
|
|
w_ = upper-lower
|
|
|
|
done = not tag_ or (rid_, tag_) < (rid, tag)
|
|
|
|
return done, rid_, tag_, w_, j, d, jump, path
|
|
|
|
# precompute tree
|
|
t_width = 0
|
|
if args.get('tree') or args.get('rbyd'):
|
|
trunks = co.defaultdict(lambda: (-1, 0))
|
|
alts = co.defaultdict(lambda: {})
|
|
|
|
rid, tag = -1, 0
|
|
while True:
|
|
done, rid, tag, w, j, d, size, path = lookup(rid, tag+0x1)
|
|
# found end of tree?
|
|
if done:
|
|
break
|
|
|
|
# keep track of trunks/alts
|
|
trunks[j] = (rid, tag)
|
|
|
|
for j_, j__, followed, c in path:
|
|
if followed:
|
|
alts[j_] |= {'f': j__, 'c': c}
|
|
else:
|
|
alts[j_] |= {'nf': j__, 'c': c}
|
|
|
|
if args.get('rbyd'):
|
|
# treat unreachable alts as converging paths
|
|
for j_, alt in alts.items():
|
|
if 'f' not in alt:
|
|
alt['f'] = alt['nf']
|
|
elif 'nf' not in alt:
|
|
alt['nf'] = alt['f']
|
|
|
|
else:
|
|
# prune any alts with unreachable edges
|
|
pruned = {}
|
|
for j_, alt in alts.items():
|
|
if 'f' not in alt:
|
|
pruned[j_] = alt['nf']
|
|
elif 'nf' not in alt:
|
|
pruned[j_] = alt['f']
|
|
for j_ in pruned.keys():
|
|
del alts[j_]
|
|
|
|
for j_, alt in alts.items():
|
|
while alt['f'] in pruned:
|
|
alt['f'] = pruned[alt['f']]
|
|
while alt['nf'] in pruned:
|
|
alt['nf'] = pruned[alt['nf']]
|
|
|
|
# find the trunk and depth of each alt
|
|
def rec_trunk(j_):
|
|
if j_ not in alts:
|
|
return trunks[j_]
|
|
else:
|
|
if 'nft' not in alts[j_]:
|
|
alts[j_]['nft'] = rec_trunk(alts[j_]['nf'])
|
|
return alts[j_]['nft']
|
|
|
|
for j_ in alts.keys():
|
|
rec_trunk(j_)
|
|
for j_, alt in alts.items():
|
|
if alt['f'] in alts:
|
|
alt['ft'] = alts[alt['f']]['nft']
|
|
else:
|
|
alt['ft'] = trunks[alt['f']]
|
|
|
|
def rec_height(j_):
|
|
if j_ not in alts:
|
|
return 0
|
|
else:
|
|
if 'h' not in alts[j_]:
|
|
alts[j_]['h'] = max(
|
|
rec_height(alts[j_]['f']),
|
|
rec_height(alts[j_]['nf'])) + 1
|
|
return alts[j_]['h']
|
|
|
|
for j_ in alts.keys():
|
|
rec_height(j_)
|
|
|
|
t_depth = max((alt['h']+1 for alt in alts.values()), default=0)
|
|
|
|
# convert to more general tree representation
|
|
TBranch = co.namedtuple('TBranch', 'a, b, d, c')
|
|
tree = set()
|
|
for j, alt in alts.items():
|
|
# note all non-trunk edges should be black
|
|
tree.add(TBranch(
|
|
a=alt['nft'],
|
|
b=alt['nft'],
|
|
d=t_depth-1 - alt['h'],
|
|
c=alt['c'],
|
|
))
|
|
if alt['ft'] != alt['nft']:
|
|
tree.add(TBranch(
|
|
a=alt['nft'],
|
|
b=alt['ft'],
|
|
d=t_depth-1 - alt['h'],
|
|
c='b',
|
|
))
|
|
|
|
# find the max depth from the tree
|
|
t_depth = max((branch.d+1 for branch in tree), default=0)
|
|
if t_depth > 0:
|
|
t_width = 2*t_depth + 2
|
|
|
|
def treerepr(rid, tag):
|
|
if t_depth == 0:
|
|
return ''
|
|
|
|
def branchrepr(x, d, was):
|
|
for branch in tree:
|
|
if branch.d == d and branch.b == x:
|
|
if any(branch.d == d and branch.a == x
|
|
for branch in tree):
|
|
return '+-', branch.c, branch.c
|
|
elif any(branch.d == d
|
|
and x > min(branch.a, branch.b)
|
|
and x < max(branch.a, branch.b)
|
|
for branch in tree):
|
|
return '|-', branch.c, branch.c
|
|
elif branch.a < branch.b:
|
|
return '\'-', branch.c, branch.c
|
|
else:
|
|
return '.-', branch.c, branch.c
|
|
for branch in tree:
|
|
if branch.d == d and branch.a == x:
|
|
return '+ ', branch.c, None
|
|
for branch in tree:
|
|
if (branch.d == d
|
|
and x > min(branch.a, branch.b)
|
|
and x < max(branch.a, branch.b)):
|
|
return '| ', branch.c, was
|
|
if was:
|
|
return '--', was, was
|
|
return ' ', None, None
|
|
|
|
trunk = []
|
|
was = None
|
|
for d in range(t_depth):
|
|
t, c, was = branchrepr((rid, tag), d, was)
|
|
|
|
trunk.append('%s%s%s%s' % (
|
|
'\x1b[33m' if color and c == 'y'
|
|
else '\x1b[31m' if color and c == 'r'
|
|
else '\x1b[90m' if color and c == 'b'
|
|
else '',
|
|
t,
|
|
('>' if was else ' ') if d == t_depth-1 else '',
|
|
'\x1b[m' if color and c else ''))
|
|
|
|
return '%s ' % ''.join(trunk)
|
|
|
|
|
|
# dynamically size the id field
|
|
w_width = m.ceil(m.log10(max(1, weight)+1))
|
|
|
|
rid, tag = -1, 0
|
|
for i in it.count():
|
|
done, rid, tag, w, j, d, size, path = lookup(rid, tag+0x1)
|
|
# found end of tree?
|
|
if done:
|
|
break
|
|
|
|
# show human-readable tag representation
|
|
print('%08x: %s%*s %-*s %s' % (
|
|
j,
|
|
treerepr(rid, tag)
|
|
if args.get('tree') or args.get('rbyd') else '',
|
|
2*w_width+1, '%d-%d' % (rid-(w-1), rid)
|
|
if w > 1 else rid
|
|
if w > 0 or i == 0 else '',
|
|
21+w_width, tagrepr(tag, w, size, j),
|
|
next(xxd(data[j+d:j+d+min(size, 8)], 8), '')
|
|
if not args.get('raw') and not args.get('no_truncate')
|
|
and not tag & TAG_ALT else ''))
|
|
|
|
# show on-disk encoding of tags
|
|
if args.get('raw'):
|
|
for o, line in enumerate(xxd(data[j:j+d])):
|
|
print('%8s: %*s%*s %s' % (
|
|
'%04x' % (j + o*16),
|
|
t_width, '',
|
|
2*w_width+1, '',
|
|
line))
|
|
if args.get('raw') or args.get('no_truncate'):
|
|
if not tag & TAG_ALT:
|
|
for o, line in enumerate(xxd(data[j+d:j+d+size])):
|
|
print('%8s: %*s%*s %s' % (
|
|
'%04x' % (j+d + o*16),
|
|
t_width, '',
|
|
2*w_width+1, '',
|
|
line))
|
|
|
|
|
|
def main(disk, blocks=None, *,
|
|
block_size=None,
|
|
block_count=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
|
|
|
|
# is bd geometry specified?
|
|
if isinstance(block_size, tuple):
|
|
block_size, block_count_ = block_size
|
|
if block_count is None:
|
|
block_count = block_count_
|
|
|
|
# flatten blocks, default to block 0
|
|
if not blocks:
|
|
blocks = [[0]]
|
|
blocks = [block for blocks_ in blocks for block in blocks_]
|
|
|
|
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 trunks
|
|
blocks, trunks = (
|
|
[block[0] if isinstance(block, tuple) else block
|
|
for block in blocks],
|
|
[trunk if trunk is not None
|
|
else block[1] if isinstance(block, tuple)
|
|
else None
|
|
for block in blocks])
|
|
|
|
# read each block
|
|
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, trunk):
|
|
rev = fromle32(data[0:4])
|
|
cksum = 0
|
|
cksum_ = crc32c(data[0:4])
|
|
cksum__ = cksum_
|
|
perturb = False
|
|
eoff = 0
|
|
eoff_ = None
|
|
j_ = 4
|
|
trunk_ = 0
|
|
trunk__ = 0
|
|
trunk___ = 0
|
|
weight = 0
|
|
weight_ = 0
|
|
weight__ = 0
|
|
while j_ < len(data) and (not trunk or eoff <= trunk):
|
|
# read next tag
|
|
v, tag, w, size, d = fromtag(data[j_:])
|
|
if v != parity(cksum__):
|
|
break
|
|
cksum__ ^= 0x00000080 if v else 0
|
|
cksum__ = crc32c(data[j_:j_+d], cksum__)
|
|
j_ += d
|
|
if not tag & TAG_ALT and j_ + size > len(data):
|
|
break
|
|
|
|
# take care of cksums
|
|
if not tag & TAG_ALT:
|
|
if (tag & 0xff00) != TAG_CKSUM:
|
|
cksum__ = crc32c(data[j_:j_+size], cksum__)
|
|
# found a cksum?
|
|
else:
|
|
# check cksum
|
|
cksum___ = fromle32(data[j_:j_+4])
|
|
if cksum__ != cksum___:
|
|
break
|
|
# commit what we have
|
|
eoff = eoff_ if eoff_ else j_ + size
|
|
cksum = cksum_
|
|
trunk_ = trunk__
|
|
weight = weight_
|
|
# update perturb bit
|
|
perturb = tag & TAG_P
|
|
# revert to data cksum and perturb
|
|
cksum__ = cksum_ ^ (0xfca42daf if perturb else 0)
|
|
|
|
# evaluate trunks
|
|
if (tag & 0xf000) != TAG_CKSUM and (
|
|
not trunk or j_-d <= trunk or trunk___):
|
|
# new trunk?
|
|
if not trunk___:
|
|
trunk___ = j_-d
|
|
weight__ = 0
|
|
|
|
# keep track of weight
|
|
weight__ += w
|
|
|
|
# end of trunk?
|
|
if not tag & TAG_ALT:
|
|
# update canonical checksum, xoring out any perturb state
|
|
cksum_ = cksum__ ^ (0xfca42daf if perturb else 0)
|
|
# update trunk/weight unless we found a shrub or an
|
|
# explicit trunk (which may be a shrub) is requested
|
|
if not tag & TAG_SHRUB or trunk___ == trunk:
|
|
trunk__ = trunk___
|
|
weight_ = weight__
|
|
# keep track of eoff for best matching trunk
|
|
if trunk and j_ + size > trunk:
|
|
eoff_ = j_ + size
|
|
eoff = eoff_
|
|
cksum = cksum_
|
|
trunk_ = trunk__
|
|
weight = weight_
|
|
trunk___ = 0
|
|
|
|
if not tag & TAG_ALT:
|
|
j_ += size
|
|
|
|
return rev, eoff, trunk_, weight, cksum
|
|
|
|
revs, eoffs, trunks_, weights, cksums = [], [], [], [], []
|
|
i = 0
|
|
for i_, (data, trunk_) in enumerate(zip(datas, trunks)):
|
|
rev, eoff, trunk_, weight, cksum = fetch(data, trunk_)
|
|
revs.append(rev)
|
|
eoffs.append(eoff)
|
|
trunks_.append(trunk_)
|
|
weights.append(weight)
|
|
cksums.append(cksum)
|
|
|
|
# compare with sequence arithmetic
|
|
if trunk_ and (
|
|
not trunks_[i]
|
|
or not ((rev - revs[i]) & 0x80000000)
|
|
or (rev == revs[i] and trunk_ > trunks_[i])):
|
|
i = i_
|
|
|
|
# print contents of the winning metadata block
|
|
block, data, rev, eoff, trunk_, weight, cksum = (
|
|
blocks[i],
|
|
datas[i],
|
|
revs[i],
|
|
eoffs[i],
|
|
trunks_[i],
|
|
weights[i],
|
|
cksums[i])
|
|
|
|
print('rbyd %s w%d, rev %08x, size %d, cksum %08x' % (
|
|
'0x%x.%x' % (block, trunk_)
|
|
if len(blocks) == 1
|
|
else '0x{%x,%s}.%x' % (
|
|
block,
|
|
','.join('%x' % blocks[(i+1+j) % len(blocks)]
|
|
for j in range(len(blocks)-1)),
|
|
trunk_),
|
|
weight,
|
|
rev,
|
|
eoff,
|
|
cksum))
|
|
|
|
if args.get('log'):
|
|
dbg_log(data, block_size, rev, eoff, weight,
|
|
color=color,
|
|
**args)
|
|
else:
|
|
dbg_tree(data, block_size, rev, trunk_, weight,
|
|
color=color,
|
|
**args)
|
|
|
|
if args.get('error_on_corrupt') and eoff == 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(
|
|
'blocks',
|
|
nargs='*',
|
|
type=rbydaddr,
|
|
help="Block address of metadata blocks.")
|
|
parser.add_argument(
|
|
'-b', '--block-size',
|
|
type=bdgeom,
|
|
help="Block size/geometry in bytes.")
|
|
parser.add_argument(
|
|
'--block-count',
|
|
type=lambda x: int(x, 0),
|
|
help="Block count in blocks.")
|
|
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(
|
|
'-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(
|
|
'-R', '--rbyd',
|
|
action='store_true',
|
|
help="Show the full 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}))
|