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682f12a953150c78e521b743a455b50338ae97cf
littlefs/scripts/dbglfs.py
Christopher Haster 682f12a953 scripts: Moved tree renderers out into their own class 
These are pretty script specific, so probably shouldn't be in the
abstract littlefs classes. This also avoids the tree renderers getting
copied into scripts that don't need them (mtree -> dbglfs.py, dbgbmap.py
in the future, etc).

This also makes TreeArt consistent with JumpArt and LifetimeArt.
2025-04-16 15:22:14 -05:00

4602 lines
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#!/usr/bin/env python3
# prevent local imports
if __name__ == "__main__":
__import__('sys').path.pop(0)
import bisect
import collections as co
import functools as ft
import itertools as it
import math as mt
import os
import struct
import sys
TAG_NULL = 0x0000 ## 0x0000 v--- ---- ---- ----
TAG_CONFIG = 0x0000 ## 0x00tt v--- ---- -ttt tttt
TAG_MAGIC = 0x0003 # 0x0003 v--- ---- ---- --11
TAG_VERSION = 0x0004 # 0x0004 v--- ---- ---- -1--
TAG_RCOMPAT = 0x0005 # 0x0005 v--- ---- ---- -1-1
TAG_WCOMPAT = 0x0006 # 0x0006 v--- ---- ---- -11-
TAG_OCOMPAT = 0x0007 # 0x0007 v--- ---- ---- -111
TAG_GEOMETRY = 0x0009 # 0x0008 v--- ---- ---- 1-rr
TAG_NAMELIMIT = 0x000c # 0x000c v--- ---- ---- 11--
TAG_FILELIMIT = 0x000d # 0x000d v--- ---- ---- 11-1
TAG_GDELTA = 0x0100 ## 0x01tt v--- ---1 -ttt tttt
TAG_GRMDELTA = 0x0100 # 0x0100 v--- ---1 ---- ----
TAG_NAME = 0x0200 ## 0x02tt v--- --1- -ttt tttt
TAG_REG = 0x0201 # 0x0201 v--- --1- ---- ---1
TAG_DIR = 0x0202 # 0x0202 v--- --1- ---- --1-
TAG_BOOKMARK = 0x0204 # 0x0204 v--- --1- ---- -1--
TAG_STICKYNOTE = 0x0205 # 0x0205 v--- --1- ---- -1-1
TAG_STRUCT = 0x0300 ## 0x03tt v--- --11 -ttt tttt
TAG_DATA = 0x0300 # 0x0300 v--- --11 ---- ----
TAG_BLOCK = 0x0304 # 0x0304 v--- --11 ---- -1rr
TAG_BSHRUB = 0x0308 # 0x0308 v--- --11 ---- 1---
TAG_BTREE = 0x030c # 0x030c v--- --11 ---- 11rr
TAG_MROOT = 0x0311 # 0x0310 v--- --11 ---1 --rr
TAG_MDIR = 0x0315 # 0x0314 v--- --11 ---1 -1rr
TAG_MTREE = 0x031c # 0x031c v--- --11 ---1 11rr
TAG_DID = 0x0320 # 0x0320 v--- --11 --1- ----
TAG_BRANCH = 0x032c # 0x032c v--- --11 --1- 11rr
TAG_ATTR = 0x0400 ## 0x04aa v--- -1-a -aaa aaaa
TAG_UATTR = 0x0400 # 0x04aa v--- -1-- -aaa aaaa
TAG_SATTR = 0x0500 # 0x05aa v--- -1-1 -aaa aaaa
TAG_SHRUB = 0x1000 ## 0x1kkk v--1 kkkk -kkk kkkk
TAG_ALT = 0x4000 ## 0x4kkk v1cd kkkk -kkk kkkk
TAG_B = 0x0000
TAG_R = 0x2000
TAG_LE = 0x0000
TAG_GT = 0x1000
TAG_CKSUM = 0x3000 ## 0x300p v-11 ---- ---- ---p
TAG_P = 0x0001
TAG_NOTE = 0x3100 ## 0x3100 v-11 ---1 ---- ----
TAG_ECKSUM = 0x3200 ## 0x3200 v-11 --1- ---- ----
TAG_GCKSUMDELTA = 0x3300 ## 0x3300 v-11 --11 ---- ----
# some ways of block geometry representations
# 512 -> 512
# 512x16 -> (512, 16)
# 0x200x10 -> (512, 16)
def bdgeom(s):
s = s.strip()
b = 10
if s.startswith('0x') or s.startswith('0X'):
s = s[2:]
b = 16
elif s.startswith('0o') or s.startswith('0O'):
s = s[2:]
b = 8
elif s.startswith('0b') or s.startswith('0B'):
s = s[2:]
b = 2
if 'x' in s:
s, s_ = s.split('x', 1)
return (int(s, b), int(s_, b))
else:
return int(s, b)
# parse some rbyd addr encodings
# 0xa -> (0xa,)
# 0xa.c -> ((0xa, 0xc),)
# 0x{a,b} -> (0xa, 0xb)
# 0x{a,b}.c -> ((0xa, 0xc), (0xb, 0xc))
def rbydaddr(s):
s = s.strip()
b = 10
if s.startswith('0x') or s.startswith('0X'):
s = s[2:]
b = 16
elif s.startswith('0o') or s.startswith('0O'):
s = s[2:]
b = 8
elif s.startswith('0b') or s.startswith('0B'):
s = s[2:]
b = 2
trunk = None
if '.' in s:
s, s_ = s.split('.', 1)
trunk = int(s_, b)
if s.startswith('{') and '}' in s:
ss = s[1:s.find('}')].split(',')
else:
ss = [s]
addr = []
for s in ss:
if trunk is not None:
addr.append((int(s, b), trunk))
else:
addr.append(int(s, b))
return tuple(addr)
def crc32c(data, crc=0):
crc ^= 0xffffffff
for b in data:
crc ^= b
for j in range(8):
crc = (crc >> 1) ^ ((crc & 1) * 0x82f63b78)
return 0xffffffff ^ crc
def pmul(a, b):
r = 0
while b:
if b & 1:
r ^= a
a <<= 1
b >>= 1
return r
def crc32cmul(a, b):
r = pmul(a, b)
for _ in range(31):
r = (r >> 1) ^ ((r & 1) * 0x82f63b78)
return r
def crc32ccube(a):
return crc32cmul(crc32cmul(a, a), a)
def popc(x):
return bin(x).count('1')
def parity(x):
return popc(x) & 1
def fromle32(data):
return struct.unpack('<I', data[0:4].ljust(4, b'\0'))[0]
def fromleb128(data):
word = 0
for i, b in enumerate(data):
word |= ((b & 0x7f) << 7*i)
word &= 0xffffffff
if not b & 0x80:
return word, i+1
return word, len(data)
def fromtag(data):
data = data.ljust(4, b'\0')
tag = (data[0] << 8) | data[1]
weight, d = fromleb128(data[2:])
size, d_ = fromleb128(data[2+d:])
return tag>>15, tag&0x7fff, weight, size, 2+d+d_
def frommdir(data):
blocks = []
d = 0
while d < len(data):
block, d_ = fromleb128(data[d:])
blocks.append(block)
d += d_
return blocks
def fromshrub(data):
d = 0
weight, d_ = fromleb128(data[d:]); d += d_
trunk, d_ = fromleb128(data[d:]); d += d_
return weight, trunk
def frombranch(data):
d = 0
block, d_ = fromleb128(data[d:]); d += d_
trunk, d_ = fromleb128(data[d:]); d += d_
cksum = fromle32(data[d:]); d += 4
return block, trunk, cksum
def frombtree(data):
d = 0
w, d_ = fromleb128(data[d:]); d += d_
block, trunk, cksum = frombranch(data[d:])
return w, block, trunk, cksum
def frombptr(data):
d = 0
size, d_ = fromleb128(data[d:]); d += d_
block, d_ = fromleb128(data[d:]); d += d_
off, d_ = fromleb128(data[d:]); d += d_
cksize, d_ = fromleb128(data[d:]); d += d_
cksum = fromle32(data[d:]); d += 4
return size, block, off, cksize, cksum
def xxd(data, width=16):
for i in range(0, len(data), width):
yield '%-*s %-*s' % (
3*width,
' '.join('%02x' % b for b in data[i:i+width]),
width,
''.join(
b if b >= ' ' and b <= '~' else '.'
for b in map(chr, data[i:i+width])))
# human readable tag repr
def tagrepr(tag, weight=None, size=None, *,
global_=False,
toff=None):
# null tags
if (tag & 0x6fff) == TAG_NULL:
return '%snull%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
' w%d' % weight if weight else '',
' %d' % size if size else '')
# config tags
elif (tag & 0x6f00) == TAG_CONFIG:
return '%s%s%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
'magic' if (tag & 0xfff) == TAG_MAGIC
else 'version' if (tag & 0xfff) == TAG_VERSION
else 'rcompat' if (tag & 0xfff) == TAG_RCOMPAT
else 'wcompat' if (tag & 0xfff) == TAG_WCOMPAT
else 'ocompat' if (tag & 0xfff) == TAG_OCOMPAT
else 'geometry' if (tag & 0xfff) == TAG_GEOMETRY
else 'namelimit' if (tag & 0xfff) == TAG_NAMELIMIT
else 'filelimit' if (tag & 0xfff) == TAG_FILELIMIT
else 'config 0x%02x' % (tag & 0xff),
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# global-state delta tags
elif (tag & 0x6f00) == TAG_GDELTA:
if global_:
return '%s%s%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
'grm' if (tag & 0xfff) == TAG_GRMDELTA
else 'gstate 0x%02x' % (tag & 0xff),
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
else:
return '%s%s%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
'grmdelta' if (tag & 0xfff) == TAG_GRMDELTA
else 'gdelta 0x%02x' % (tag & 0xff),
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# name tags, includes file types
elif (tag & 0x6f00) == TAG_NAME:
return '%s%s%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
'name' if (tag & 0xfff) == TAG_NAME
else 'reg' if (tag & 0xfff) == TAG_REG
else 'dir' if (tag & 0xfff) == TAG_DIR
else 'bookmark' if (tag & 0xfff) == TAG_BOOKMARK
else 'stickynote' if (tag & 0xfff) == TAG_STICKYNOTE
else 'name 0x%02x' % (tag & 0xff),
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# structure tags
elif (tag & 0x6f00) == TAG_STRUCT:
return '%s%s%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
'data' if (tag & 0xfff) == TAG_DATA
else 'block' if (tag & 0xfff) == TAG_BLOCK
else 'bshrub' if (tag & 0xfff) == TAG_BSHRUB
else 'btree' if (tag & 0xfff) == TAG_BTREE
else 'mroot' if (tag & 0xfff) == TAG_MROOT
else 'mdir' if (tag & 0xfff) == TAG_MDIR
else 'mtree' if (tag & 0xfff) == TAG_MTREE
else 'did' if (tag & 0xfff) == TAG_DID
else 'branch' if (tag & 0xfff) == TAG_BRANCH
else 'struct 0x%02x' % (tag & 0xff),
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# custom attributes
elif (tag & 0x6e00) == TAG_ATTR:
return '%s%sattr 0x%02x%s%s' % (
'shrub' if tag & TAG_SHRUB else '',
's' if tag & 0x100 else 'u',
((tag & 0x100) >> 1) ^ (tag & 0xff),
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# alt pointers
elif tag & TAG_ALT:
return 'alt%s%s 0x%03x%s%s' % (
'r' if tag & TAG_R else 'b',
'gt' if tag & TAG_GT else 'le',
tag & 0x0fff,
' w%d' % weight if weight is not None else '',
' 0x%x' % (0xffffffff & (toff-size))
if size and toff is not None
else ' -%d' % size if size
else '')
# checksum tags
elif (tag & 0x7f00) == TAG_CKSUM:
return 'cksum%s%s%s%s' % (
'p' if not tag & 0xfe and tag & TAG_P else '',
' 0x%02x' % (tag & 0xff) if tag & 0xfe else '',
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# note tags
elif (tag & 0x7f00) == TAG_NOTE:
return 'note%s%s%s' % (
' 0x%02x' % (tag & 0xff) if tag & 0xff else '',
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# erased-state checksum tags
elif (tag & 0x7f00) == TAG_ECKSUM:
return 'ecksum%s%s%s' % (
' 0x%02x' % (tag & 0xff) if tag & 0xff else '',
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# global-checksum delta tags
elif (tag & 0x7f00) == TAG_GCKSUMDELTA:
if global_:
return 'gcksum%s%s%s' % (
' 0x%02x' % (tag & 0xff) if tag & 0xff else '',
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
else:
return 'gcksumdelta%s%s%s' % (
' 0x%02x' % (tag & 0xff) if tag & 0xff else '',
' w%d' % weight if weight else '',
' %s' % size if size is not None else '')
# unknown tags
else:
return '0x%04x%s%s' % (
tag,
' w%d' % weight if weight is not None else '',
' %d' % size if size is not None else '')
# compute the difference between two paths, returning everything
# in a after the paths diverge, as well as the relevant index
def pathdelta(a, b):
if not isinstance(a, list):
a = list(a)
i = 0
for a_, b_ in zip(a, b):
try:
if type(a_) == type(b_) and a_ == b_:
i += 1
else:
break
# treat exceptions here as failure to match, most likely
# the compared types are incompatible, it's the caller's
# problem
except Exception:
break
return [(i+j, a_) for j, a_ in enumerate(a[i:])]
# a simple wrapper over an open file with bd geometry
class Bd:
def __init__(self, f, block_size=None, block_count=None):
self.f = f
self.block_size = block_size
self.block_count = block_count
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return 'bd %sx%s' % (self.block_size, self.block_count)
def read(self, size=-1):
return self.f.read(size)
def seek(self, block, off=0, whence=0):
pos = self.f.seek(block*self.block_size + off, whence)
return pos // self.block_size, pos % self.block_size
def readblock(self, block):
self.f.seek(block*self.block_size)
return self.f.read(self.block_size)
# tagged data in an rbyd
class Rattr:
def __init__(self, tag, weight, blocks, toff, tdata, data):
self.tag = tag
self.weight = weight
if isinstance(blocks, int):
self.blocks = (blocks,)
else:
self.blocks = blocks
self.toff = toff
self.tdata = tdata
self.data = data
@property
def block(self):
return self.blocks[0]
@property
def tsize(self):
return len(self.tdata)
@property
def off(self):
return self.toff + len(self.tdata)
@property
def size(self):
return len(self.data)
def __bytes__(self):
return self.data
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return tagrepr(self.tag, self.weight, self.size)
def __iter__(self):
return iter((self.tag, self.weight, self.data))
def __eq__(self, other):
return ((self.tag, self.weight, self.data)
== (other.tag, other.weight, other.data))
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash((self.tag, self.weight, self.data))
# convenience for did/name access
def _parse_name(self):
# note we return a null name for non-name tags, this is so
# vestigial names in btree nodes act as a catch-all
if (self.tag & 0xff00) != TAG_NAME:
did = 0
name = b''
else:
did, d = fromleb128(self.data)
name = self.data[d:]
# cache both
self.did = did
self.name = name
@ft.cached_property
def did(self):
self._parse_name()
return self.did
@ft.cached_property
def name(self):
self._parse_name()
return self.name
class Ralt:
def __init__(self, tag, weight, blocks, toff, tdata, jump,
color=None, followed=None):
self.tag = tag
self.weight = weight
if isinstance(blocks, int):
self.blocks = (blocks,)
else:
self.blocks = blocks
self.toff = toff
self.tdata = tdata
self.jump = jump
if color is not None:
self.color = color
else:
self.color = 'r' if tag & TAG_R else 'b'
self.followed = followed
@property
def block(self):
return self.blocks[0]
@property
def tsize(self):
return len(self.tdata)
@property
def off(self):
return self.toff + len(self.tdata)
@property
def joff(self):
return self.toff - self.jump
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return tagrepr(self.tag, self.weight, self.jump, toff=self.toff)
def __iter__(self):
return iter((self.tag, self.weight, self.jump))
def __eq__(self, other):
return ((self.tag, self.weight, self.jump)
== (other.tag, other.weight, other.jump))
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash((self.tag, self.weight, self.jump))
# our core rbyd type
class Rbyd:
def __init__(self, blocks, trunk, weight, rev, eoff, cksum, data, *,
gcksumdelta=None,
corrupt=False):
if isinstance(blocks, int):
self.blocks = (blocks,)
else:
self.blocks = blocks
self.trunk = trunk
self.weight = weight
self.rev = rev
self.eoff = eoff
self.cksum = cksum
self.data = data
self.gcksumdelta = gcksumdelta
self.corrupt = corrupt
@property
def block(self):
return self.blocks[0]
def addr(self):
if len(self.blocks) == 1:
return '0x%x.%x' % (self.block, self.trunk)
else:
return '0x{%s}.%x' % (
','.join('%x' % block for block in self.blocks),
self.trunk)
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return 'rbyd %s w%s' % (self.addr(), self.weight)
def __bool__(self):
return not self.corrupt
def __eq__(self, other):
return ((frozenset(self.blocks), self.trunk)
== (frozenset(other.blocks), other.trunk))
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash((frozenset(self.blocks), self.trunk))
@classmethod
def _fetch(cls, data, block, trunk=None):
# fetch the rbyd
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
gcksumdelta = None
gcksumdelta_ = None
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 gcksumdelta?
if (tag & 0xff00) == TAG_GCKSUMDELTA:
gcksumdelta_ = Rattr(tag, w, block, j_-d,
data[j_-d:j_],
data[j_:j_+size])
# 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_
gcksumdelta = gcksumdelta_
gcksumdelta_ = None
# 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:
if not (trunk and j_-d > trunk and not 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 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__ ^ (
0xfca42daf if perturb else 0)
trunk_ = trunk__
weight = weight_
gcksumdelta = gcksumdelta_
trunk___ = 0
# update canonical checksum, xoring out any perturb state
cksum_ = cksum__ ^ (0xfca42daf if perturb else 0)
if not tag & TAG_ALT:
j_ += size
return cls(block, trunk_, weight, rev, eoff, cksum, data,
gcksumdelta=gcksumdelta,
corrupt=not trunk_)
@classmethod
def fetch(cls, bd, blocks, trunk=None):
# multiple blocks?
if not isinstance(blocks, int):
# fetch all blocks
rbyds = [cls.fetch(bd, block, trunk) for block in blocks]
# determine most recent revision
i = 0
for i_, rbyd in enumerate(rbyds):
# compare with sequence arithmetic
if rbyd and (
not rbyds[i]
or not ((rbyd.rev - rbyds[i].rev) & 0x80000000)
or (rbyd.rev == rbyds[i].rev
and rbyd.trunk > rbyds[i].trunk)):
i = i_
# keep track of the other blocks
rbyd = rbyds[i]
rbyd.blocks += tuple(
rbyds[(i+1+j) % len(rbyds)].block
for j in range(len(rbyds)-1))
# and patch the gcksumdelta if we have one
if rbyd.gcksumdelta is not None:
rbyd.gcksumdelta.blocks = rbyd.blocks
return rbyd
# seek/read the block
block = blocks
data = bd.readblock(block)
# fetch the rbyd
return cls._fetch(data, block, trunk)
@classmethod
def fetchck(cls, bd, blocks, trunk, weight, cksum):
# try to fetch the rbyd normally
rbyd = cls.fetch(bd, blocks, trunk)
# cksum mismatch? trunk/weight mismatch?
if (rbyd.cksum != cksum
or rbyd.trunk != trunk
or rbyd.weight != weight):
# mark as corrupt and keep track of expected trunk/weight
rbyd.corrupt = True
rbyd.trunk = trunk
rbyd.weight = weight
return rbyd
@classmethod
def fetchshrub(cls, rbyd, trunk):
# steal the original rbyd's data
#
# this helps avoid race conditions with cksums and stuff
shrub = cls._fetch(rbyd.data, rbyd.block, trunk)
shrub.blocks = rbyd.blocks
return shrub
def lookupnext(self, rid, tag=None, *,
path=False):
if not self or rid >= self.weight:
if path:
return None, None, []
else:
return None, None
tag = max(tag or 0, 0x1)
lower = 0
upper = self.weight
path_ = []
# descend down tree
j = self.trunk
while True:
_, alt, w, jump, d = fromtag(self.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
if path:
# figure out which color
if alt & TAG_R:
_, nalt, _, _, _ = fromtag(self.data[j+jump+d:])
if nalt & TAG_R:
color = 'y'
else:
color = 'r'
else:
color = 'b'
path_.append(Ralt(
alt, w, self.blocks, j+jump,
self.data[j+jump:j+jump+d], jump,
color=color,
followed=True))
# stay on path
else:
lower += w if not alt & TAG_GT else 0
upper -= w if alt & TAG_GT else 0
j = j + d
if path:
# figure out which color
if alt & TAG_R:
_, nalt, _, _, _ = fromtag(self.data[j:])
if nalt & TAG_R:
color = 'y'
else:
color = 'r'
else:
color = 'b'
path_.append(Ralt(
alt, w, self.blocks, j-d,
self.data[j-d:j], jump,
color=color,
followed=False))
# found tag
else:
rid_ = upper-1
tag_ = alt
w_ = upper-lower
if not tag_ or (rid_, tag_) < (rid, tag):
if path:
return None, None, path_
else:
return None, None
rattr_ = Rattr(tag_, w_, self.blocks, j,
self.data[j:j+d],
self.data[j+d:j+d+jump])
if path:
return rid_, rattr_, path_
else:
return rid_, rattr_
def lookup(self, rid, tag=None, mask=None, *,
path=False):
if tag is None:
tag, mask = 0, 0xffff
if mask is None:
mask = 0
r = self.lookupnext(rid, tag & ~mask,
path=path)
if path:
rid_, rattr_, path_ = r
else:
rid_, rattr_ = r
if (rid_ is None
or rid_ != rid
or (rattr_.tag & ~mask) != (tag & ~mask)):
if path:
return None, path_
else:
return None
if path:
return rattr_, path_
else:
return rattr_
def __getitem__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key)
def __contains__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key) is not None
def rids(self, *,
path=False):
rid = -1
while True:
r = self.lookupnext(rid,
path=path)
if path:
rid, name, path_ = r
else:
rid, name = r
# found end of tree?
if rid is None:
break
if path:
yield rid, name, path_
else:
yield rid, name
rid += 1
def rattrs(self, rid=None, tag=None, mask=None, *,
path=False):
if rid is None:
rid, tag = -1, 0
while True:
r = self.lookupnext(rid, tag+0x1,
path=path)
if path:
rid, rattr, path_ = r
else:
rid, rattr = r
# found end of tree?
if rid is None:
break
if path:
yield rid, rattr, path_
else:
yield rid, rattr
tag = rattr.tag
else:
if tag is None:
tag, mask = 0, 0xffff
if mask is None:
mask = 0
tag_ = max((tag & ~mask) - 1, 0)
while True:
r = self.lookupnext(rid, tag_+0x1,
path=path)
if path:
rid_, rattr_, path_ = r
else:
rid_, rattr_ = r
# found end of tree?
if (rid_ is None
or rid_ != rid
or (rattr_.tag & ~mask) != (tag & ~mask)):
break
if path:
yield rattr_, path_
else:
yield rattr_
tag_ = rattr_.tag
def __iter__(self):
return self.rattrs()
# lookup by name
def namelookup(self, did, name):
# binary search
best = None, None
lower = 0
upper = self.weight
while lower < upper:
rid, name_ = self.lookupnext(
lower + (upper-1-lower)//2)
if rid is None:
break
# bisect search space
if (name_.did, name_.name) > (did, name):
upper = rid-(name_.weight-1)
elif (name_.did, name_.name) < (did, name):
lower = rid + 1
# keep track of best match
best = rid, name_
else:
# found a match
return rid, name_
return best
# our rbyd btree type
class Btree:
def __init__(self, bd, rbyd):
self.bd = bd
self.rbyd = rbyd
@property
def block(self):
return self.rbyd.block
@property
def blocks(self):
return self.rbyd.blocks
@property
def trunk(self):
return self.rbyd.trunk
@property
def weight(self):
return self.rbyd.weight
@property
def rev(self):
return self.rbyd.rev
@property
def eoff(self):
return self.rbyd.eoff
@property
def cksum(self):
return self.rbyd.cksum
def addr(self):
return self.rbyd.addr()
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return 'btree %s w%s' % (self.addr(), self.weight)
def __eq__(self, other):
return self.rbyd == other.rbyd
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash(self.rbyd)
@classmethod
def fetch(cls, bd, blocks, trunk=None):
# rbyd fetch does most of the work here
rbyd = Rbyd.fetch(bd, blocks, trunk)
return cls(bd, rbyd)
@classmethod
def fetchck(cls, bd, blocks, trunk, weight, cksum):
# rbyd fetchck does most of the work here
rbyd = Rbyd.fetchck(bd, blocks, trunk, weight, cksum)
return cls(bd, rbyd)
@classmethod
def fetchshrub(cls, bd, rbyd, trunk):
shrub = Rbyd.fetchshrub(rbyd, trunk)
return cls(bd, shrub)
def lookupleaf(self, bid, *,
path=False,
depth=None):
if not self or bid >= self.weight:
if path:
return None, None, None, None, []
else:
return None, None, None, None
rbyd = self.rbyd
rid = bid
depth_ = 1
path_ = []
while True:
# corrupt branch?
if not rbyd:
if path:
return bid, rbyd, rid, None, path_
else:
return bid, rbyd, rid, None
# first tag indicates the branch's weight
rid_, name_ = rbyd.lookupnext(rid)
if rid_ is None:
if path:
return None, None, None, None, path_
else:
return None, None, None, None
# keep track of path
if path:
path_.append((bid + (rid_-rid), rbyd, rid_, name_))
# find branch tag if there is one
branch_ = rbyd.lookup(rid_, TAG_BRANCH, 0x3)
# descend down branch?
if branch_ is not None and (
not depth or depth_ < depth):
block, trunk, cksum = frombranch(branch_.data)
rbyd = Rbyd.fetchck(self.bd, block, trunk, name_.weight,
cksum)
rid -= (rid_-(name_.weight-1))
depth_ += 1
else:
if path:
return bid + (rid_-rid), rbyd, rid_, name_, path_
else:
return bid + (rid_-rid), rbyd, rid_, name_
# the non-leaf variants discard the rbyd info, these can be a bit
# more convenient, but at a performance cost
def lookupnext(self, bid, *,
path=False,
depth=None):
# just discard the rbyd info
r = self.lookupleaf(bid,
path=path,
depth=depth)
if path:
bid, rbyd, rid, name, path_ = r
else:
bid, rbyd, rid, name = r
if path:
return bid, name, path_
else:
return bid, name
def lookup(self, bid, tag=None, mask=None, *,
path=False,
depth=None):
# lookup rbyd in btree
#
# note this function expects bid to be known, use lookupnext
# first if you don't care about the exact bid (or better yet,
# lookupleaf and call lookup on the returned rbyd)
#
# this matches rbyd's lookup behavior, which needs a known rid
# to avoid a double lookup
r = self.lookupleaf(bid,
path=path,
depth=depth)
if path:
bid_, rbyd_, rid_, name_, path_ = r
else:
bid_, rbyd_, rid_, name_ = r
if bid_ is None or bid_ != bid:
if path:
return None, path_
else:
return None
# lookup tag in rbyd
rattr_ = rbyd_.lookup(rid_, tag, mask)
if rattr_ is None:
if path:
return None, path_
else:
return None
if path:
return rattr_, path_
else:
return rattr_
def __getitem__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key)
def __contains__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key) is not None
# note leaves only iterates over leaf rbyds, whereas traverse
# traverses all rbyds
def leaves(self, *,
path=False,
depth=None):
# include our root rbyd even if the weight is zero
if self.weight == 0:
if path:
yield -1, self.rbyd, []
else:
yield -1, self.rbyd
return
bid = 0
while True:
r = self.lookupleaf(bid,
path=path,
depth=depth)
if r:
bid, rbyd, rid, name, path_ = r
else:
bid, rbyd, rid, name = r
if bid is None:
break
if path:
yield bid-rid + (rbyd.weight-1), rbyd, path_[:-1]
else:
yield bid-rid + (rbyd.weight-1), rbyd
bid += rbyd.weight - rid + 1
def traverse(self, *,
path=False,
depth=None):
ptrunk_ = []
for bid, rbyd, path_ in self.leaves(
path=True,
depth=depth):
# we only care about the rbyds here
trunk_ = ([(bid_-rid_ + (rbyd_.weight-1), rbyd_)
for bid_, rbyd_, rid_, name_ in path_]
+ [(bid, rbyd)])
for d, (bid_, rbyd_) in pathdelta(
trunk_, ptrunk_):
# but include branch rids in the path if requested
if path:
yield bid_, rbyd_, path_[:d]
else:
yield bid_, rbyd_
ptrunk_ = trunk_
# note bids/rattrs do _not_ include corrupt btree nodes!
def bids(self, *,
leaves=False,
path=False,
depth=None):
for r in self.leaves(
path=path,
depth=depth):
if path:
bid, rbyd, path_ = r
else:
bid, rbyd = r
for rid, name in rbyd.rids():
bid_ = bid-(rbyd.weight-1) + rid
if leaves:
if path:
yield (bid_, rbyd, rid, name,
path_+[(bid_, rbyd, rid, name)])
else:
yield bid_, rbyd, rid, name
else:
if path:
yield (bid_, name,
path_+[(bid_, rbyd, rid, name)])
else:
yield bid_, name
def rattrs(self, bid=None, tag=None, mask=None, *,
leaves=False,
path=False,
depth=None):
if bid is None:
for r in self.leaves(
path=path,
depth=depth):
if path:
bid, rbyd, path_ = r
else:
bid, rbyd = r
for rid, name in rbyd.rids():
bid_ = bid-(rbyd.weight-1) + rid
for rattr in rbyd.rattrs(rid):
if leaves:
if path:
yield (bid_, rbyd, rid, rattr,
path_+[(bid_, rbyd, rid, name)])
else:
yield bid_, rbyd, rid, rattr
else:
if path:
yield (bid_, rattr,
path_+[(bid_, rbyd, rid, name)])
else:
yield bid_, rattr
else:
r = self.lookupleaf(bid,
path=path,
depth=depth)
if path:
bid, rbyd, rid, name, path_ = r
else:
bid, rbyd, rid, name = r
if bid is None:
return
for rattr in rbyd.rattrs(rid, tag, mask):
if leaves:
if path:
yield rbyd, rid, rattr, path_
else:
yield rbyd, rid, rattr
else:
if path:
yield rattr, path_
else:
yield rattr
def __iter__(self):
return self.rattrs()
# lookup by name
def namelookupleaf(self, did, name, *,
path=False,
depth=None):
rbyd = self.rbyd
bid = 0
depth_ = 1
path_ = []
while True:
# corrupt branch?
if not rbyd:
bid_ = bid+(rbyd.weight-1)
if path:
return bid_, rbyd, rbyd.weight-1, None, path_
else:
return bid_, rbyd, rbyd.weight-1, None
rid_, name_ = rbyd.namelookup(did, name)
# keep track of path
if path:
path_.append((bid + rid_, rbyd, rid_, name_))
# find branch tag if there is one
branch_ = rbyd.lookup(rid_, TAG_BRANCH, 0x3)
# found another branch
if branch_ is not None and (
not depth or depth_ < depth):
block, trunk, cksum = frombranch(branch_.data)
rbyd = Rbyd.fetchck(self.bd, block, trunk, name_.weight,
cksum)
# update our bid
bid += rid_ - (name_.weight-1)
depth_ += 1
# found best match
else:
if path:
return bid + rid_, rbyd, rid_, name_, path_
else:
return bid + rid_, rbyd, rid_, name_
def namelookup(self, bid, *,
path=False,
depth=None):
# just discard the rbyd info
r = self.namelookupleaf(did, name,
path=path,
depth=depth)
if path:
bid, rbyd, rid, name, path_ = r
else:
bid, rbyd, rid, name = r
if path:
return bid, name, path_
else:
return bid, name
# a metadata id, this includes mbits for convenience
class Mid:
def __init__(self, mbid, mrid=None, *,
mbits=None):
# we need one of these to figure out mbits
if mbits is not None:
self.mbits = mbits
elif isinstance(mbid, Mid):
self.mbits = mbid.mbits
else:
assert mbits is not None, "mbits?"
# accept other mids which can be useful for changing mrids
if isinstance(mbid, Mid):
mbid = mbid.mbid
# accept either merged mid or separate mbid+mrid
if mrid is None:
mid = mbid
mbid = mid | ((1 << self.mbits) - 1)
mrid = mid & ((1 << self.mbits) - 1)
# map mrid=-1
if mrid == ((1 << self.mbits) - 1):
mrid = -1
self.mbid = mbid
self.mrid = mrid
@property
def mid(self):
return ((self.mbid & ~((1 << self.mbits) - 1))
| (self.mrid & ((1 << self.mbits) - 1)))
def mbidrepr(self):
return str(self.mbid >> self.mbits)
def mridrepr(self):
return str(self.mrid)
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return '%s.%s' % (self.mbidrepr(), self.mridrepr())
def __iter__(self):
return iter((self.mbid, self.mrid))
# note this is slightly different from mid order when mrid=-1
def __eq__(self, other):
if isinstance(other, Mid):
return (self.mbid, self.mrid) == (other.mbid, other.mrid)
else:
return self.mid == other
def __ne__(self, other):
if isinstance(other, Mid):
return (self.mbid, self.mrid) != (other.mbid, other.mrid)
else:
return self.mid != other
def __hash__(self):
return hash((self.mbid, self.mrid))
def __lt__(self, other):
return (self.mbid, self.mrid) < (other.mbid, other.mrid)
def __le__(self, other):
return (self.mbid, self.mrid) <= (other.mbid, other.mrid)
def __gt__(self, other):
return (self.mbid, self.mrid) > (other.mbid, other.mrid)
def __ge__(self, other):
return (self.mbid, self.mrid) >= (other.mbid, other.mrid)
# mdirs, the gooey atomic center of littlefs
#
# really the only difference between this and our rbyd class is the
# implicit mbid associated with the mdir
class Mdir:
def __init__(self, mid, rbyd, *,
mbits=None,
corrupt=False):
# we need one of these to figure out mbits
if mbits is not None:
self.mbits = mbits
elif isinstance(mid, Mid):
self.mbits = mid.mbits
elif isinstance(rbyd, Mdir):
self.mbits = rbyd.mbits
else:
assert mbits is not None, "mbits?"
# strip mrid, bugs will happen if caller relies on mrid here
self.mid = Mid(mid, -1, mbits=self.mbits)
# accept either another mdir or rbyd
if isinstance(rbyd, Mdir):
self.rbyd = rbyd.rbyd
self.corrupt = corrupt or rbyd.corrupt
else:
self.rbyd = rbyd
self.corrupt = corrupt or rbyd.corrupt
@property
def data(self):
return self.rbyd.data
@property
def block(self):
return self.rbyd.block
@property
def blocks(self):
return self.rbyd.blocks
@property
def trunk(self):
return self.rbyd.trunk
@property
def weight(self):
return self.rbyd.weight
@property
def rev(self):
return self.rbyd.rev
@property
def eoff(self):
return self.rbyd.eoff
@property
def cksum(self):
return self.rbyd.cksum
@property
def gcksumdelta(self):
return self.rbyd.gcksumdelta
def addr(self):
return self.rbyd.addr()
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return 'mdir %s %s w%s' % (
self.mid.mbidrepr(),
self.addr(),
self.weight)
def __bool__(self):
return not self.corrupt
# we _don't_ care about mid for equality, or trunk even
def __eq__(self, other):
return frozenset(self.blocks) == frozenset(other.blocks)
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash(frozenset(self.blocks))
@classmethod
def fetch(cls, bd, mid, blocks, trunk=None):
rbyd = Rbyd.fetch(bd, blocks, trunk)
return cls(mid, rbyd, mbits=Mtree.mbits_(bd))
def lookup(self, mid, tag=None, mask=None, *,
path=False):
if not isinstance(mid, Mid):
mid = Mid(mid, mbits=self.mbits)
return self.rbyd.lookup(mid.mrid, tag, mask,
path=path)
def __getitem__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key)
def __contains__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key) is not None
def mids(self, *,
path=False):
for r in self.rbyd.rids(
path=path):
if path:
rid, name, path_ = r
else:
rid, name = r
mid = Mid(self.mid, rid)
if path:
yield mid, name, path_
else:
yield mid, name
def rattrs(self, mid=None, tag=None, mask=None, *,
path=False):
if mid is None:
for r in self.rbyd.rattrs(
path=path):
if path:
rid, rattr, path_ = r
else:
rid, rattr = r
mid = Mid(self.mid, rid)
if path:
yield mid, rattr, path_
else:
yield mid, rattr
else:
if not isinstance(mid, Mid):
mid = Mid(mid, mbits=self.mbits)
yield from self.rbyd.rattrs(mid.mrid, tag, mask,
path=path)
def __iter__(self):
return self.rattrs()
# lookup by name
def namelookup(self, did, name):
# unlike rbyd namelookup, we need an exact match here
rid, name_ = self.rbyd.namelookup(did, name)
if rid is None or (name_.did, name_.name) != (did, name):
return None, None
return Mid(self.mid, rid), name_
# the mtree, the skeletal structure of littlefs
class Mtree:
def __init__(self, bd, mrootchain, mtree, *,
mrootpath=False,
mtreepath=False,
mbits=None):
if isinstance(mrootchain, Mdir):
mrootchain = [Mdir]
# we at least need the mrootanchor, even if it is corrupt
assert len(mrootchain) >= 1
self.bd = bd
if mbits is not None:
self.mbits = mbits
else:
self.mbits = Mtree.mbits_(self.bd)
self.mrootchain = mrootchain
self.mrootanchor = mrootchain[0]
self.mroot = mrootchain[-1]
self.mtree = mtree
# mbits is a static value derived from the block_size
@staticmethod
def mbits_(block_size):
if isinstance(block_size, Bd):
block_size = block_size.block_size
return mt.ceil(mt.log2(block_size // 8))
# convenience function for creating mbits-dependent mids
def mid(self, mbid, mrid=None):
return Mid(mbid, mrid, mbits=self.mbits)
@property
def block(self):
return self.mroot.block
@property
def blocks(self):
return self.mroot.blocks
@property
def trunk(self):
return self.mroot.trunk
@property
def weight(self):
if self.mtree is None:
return 0
else:
return self.mtree.weight
@property
def mbweight(self):
return self.weight
@property
def mrweight(self):
return 1 << self.mbits
def mbweightrepr(self):
return str(self.mbweight >> self.mbits)
def mrweightrepr(self):
return str(self.mrweight)
@property
def rev(self):
return self.mroot.rev
@property
def eoff(self):
return self.mroot.eoff
@property
def cksum(self):
return self.mroot.cksum
def addr(self):
return self.mroot.addr()
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return 'mtree %s w%s.%s' % (
self.addr(),
self.mbweightrepr(), self.mrweightrepr())
def __eq__(self, other):
return self.mrootanchor == other.mrootanchor
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash(self.mrootanchor)
@classmethod
def fetch(cls, bd, blocks=None, trunk=None, *,
depth=None):
# default to blocks 0x{0,1}
if blocks is None:
blocks = [0, 1]
# figure out mbits
mbits = Mtree.mbits_(bd)
# fetch the mrootanchor
mrootanchor = Mdir.fetch(bd, -1, blocks, trunk)
# follow the mroot chain to try to find the active mroot
mroot = mrootanchor
mrootchain = [mrootanchor]
mrootseen = set()
while True:
# corrupted?
if not mroot:
break
# cycle detected?
if mroot in mrootseen:
break
mrootseen.add(mroot)
# stop here?
if depth and len(mrootchain) >= depth:
break
# fetch the next mroot
rattr_ = mroot.lookup(-1, TAG_MROOT, 0x3)
if rattr_ is None:
break
blocks_ = frommdir(rattr_.data)
mroot = Mdir.fetch(bd, -1, blocks_)
mrootchain.append(mroot)
# fetch the actual mtree, if there is one
mtree = None
if not depth or len(mrootchain) < depth:
rattr_ = mroot.lookup(-1, TAG_MTREE, 0x3)
if rattr_ is not None:
w_, block_, trunk_, cksum_ = frombtree(rattr_.data)
mtree = Btree.fetchck(bd, block_, trunk_, w_, cksum_)
return cls(bd, mrootchain, mtree,
mbits=mbits)
def _lookupleaf(self, mid, *,
path=False,
depth=None):
if not isinstance(mid, Mid):
mid = self.mid(mid)
if path or depth:
# iterate over mrootchain
path_ = []
for mroot in self.mrootchain:
name = mroot.lookup(-1, TAG_MAGIC)
path_.append((mroot.mid, mroot, name))
# stop here?
if depth and len(path_) >= depth:
if path:
return mroot, path_
else:
return mroot
# no mtree? must be inlined in mroot
if self.mtree is None:
if mid.mbid >= (1 << self.mbits):
if path:
return None, path_
else:
return None
mdir = Mdir(0, self.mroot)
if path:
return mdir, path_
else:
return mdir
# mtree? lookup in mtree
else:
# need to do two steps here in case lookupleaf stops early
r = self.mtree.lookupleaf(mid.mid,
path=path or depth,
depth=depth-len(path_) if depth else None)
if path or depth:
bid_, rbyd_, rid_, name_, path__ = r
path_.extend(path__)
else:
bid_, rbyd_, rid_, name_ = r
if bid_ is None:
if path:
return None, path_
else:
return None
# corrupt btree node?
if not rbyd_:
if path:
return (bid_, rbyd_, rid_), path_
else:
return (bid_, rbyd_, rid_)
# stop here? it's not an mdir, but we only return btree nodes
# if explicitly requested
if depth and len(path_) >= depth:
if path:
return (bid_, rbyd_, rid_), path_
else:
return (bid_, rbyd_, rid_)
# fetch the mdir
rattr_ = rbyd_.lookup(rid_, TAG_MDIR, 0x3)
# mdir tag missing? weird
if rattr_ is None:
if path:
return (bid_, rbyd_, rid_), path_
else:
return (bid_, rbyd_, rid_)
blocks_ = frommdir(rattr_.data)
mdir = Mdir.fetch(self.bd, mid, blocks_)
if path:
return mdir, path_
else:
return mdir
def lookupleaf(self, mid, *,
mdirs_only=True,
path=False,
depth=None):
# most of the logic is in _lookupleaf, this just helps
# deduplicate the mdirs_only logic
r = self._lookupleaf(mid,
path=path,
depth=depth)
if path:
mdir, path_ = r
else:
mdir = r
if mdir is None or (
mdirs_only and not isinstance(mdir, Mdir)):
if path:
return None, path_
else:
return None
if path:
return mdir, path_
else:
return mdir
def lookup(self, mid, *,
path=False,
depth=None):
if not isinstance(mid, Mid):
mid = self.mid(mid)
# lookup the relevant mdir
r = self.lookupleaf(mid,
path=path,
depth=depth)
if path:
mdir, path_ = r
else:
mdir = r
if mdir is None:
if path:
return None, None, path_
else:
return None, None
# not in mdir?
if mid.mrid >= mdir.weight:
if path:
return None, None, path_
else:
return None, None
# lookup name in mdir
name = mdir.lookup(mid)
# name tag missing? weird
if name is None:
if path:
return None, None, path_
else:
return None, None
if path:
return mdir, name, path_+[(mid, mdir, name)]
else:
return mdir, name
def __getitem__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key)
def __contains__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key) is not None
# iterate over all mdirs, this includes the mrootchain
def _leaves(self, *,
path=False,
depth=None):
# iterate over mrootchain
if path or depth:
path_ = []
for mroot in self.mrootchain:
if path:
yield mroot, path_
else:
yield mroot
if path or depth:
name = mroot.lookup(-1, TAG_MAGIC)
path_.append((mroot.mid, mroot, name))
# stop here?
if depth and len(path_) >= depth:
return
# do we even have an mtree?
if self.mtree is not None:
# include the mtree root even if the weight is zero
if self.mtree.weight == 0:
if path:
yield -1, self.mtree.rbyd, path_
else:
yield -1, self.mtree.rbyd
return
mid = self.mid(0)
while True:
r = self.lookupleaf(mid,
mdirs_only=False,
path=path,
depth=depth)
if path:
mdir, path_ = r
else:
mdir = r
if mdir is None:
break
# mdir?
if isinstance(mdir, Mdir):
if path:
yield mdir, path_
else:
yield mdir
mid = self.mid(mid.mbid+1)
# btree node?
else:
bid, rbyd, rid = mdir
if path:
yield (bid-rid + (rbyd.weight-1), rbyd), path_[:-1]
else:
yield (bid-rid + (rbyd.weight-1), rbyd)
mid = self.mid(bid-rid + (rbyd.weight-1) + 1)
def leaves(self, *,
mdirs_only=False,
path=False,
depth=None):
for r in self._leaves(
path=path,
depth=depth):
if path:
mdir, path_ = r
else:
mdir = r
if mdirs_only and not isinstance(mdir, Mdir):
continue
if path:
yield mdir, path_
else:
yield mdir
# traverse over all mdirs and btree nodes
# - mdir => Mdir
# - btree node => (bid, rbyd)
def _traverse(self, *,
path=False,
depth=None):
ptrunk_ = []
for mdir, path_ in self.leaves(
path=True,
depth=depth):
# we only care about the mdirs/rbyds here
trunk_ = ([(lambda mid_, mdir_, name_: mdir_)(*p)
if isinstance(p[1], Mdir)
else (lambda bid_, rbyd_, rid_, name_:
(bid_-rid_ + (rbyd_.weight-1), rbyd_))(*p)
for p in path_]
+ [mdir])
for d, mdir in pathdelta(
trunk_, ptrunk_):
# but include branch mids/rids in the path if requested
if path:
yield mdir, path_[:d]
else:
yield mdir
ptrunk_ = trunk_
def traverse(self, *,
mdirs_only=False,
path=False,
depth=None):
for r in self._traverse(
path=path,
depth=depth):
if path:
mdir, path_ = r
else:
mdir = r
if mdirs_only and not isinstance(mdir, Mdir):
continue
if path:
yield mdir, path_
else:
yield mdir
# these are just aliases
# the difference between mdirs and leaves is mdirs defaults to only
# mdirs, leaves can include btree nodes if corrupt
def mdirs(self, *,
mdirs_only=True,
path=False,
depth=None):
return self.leaves(
mdirs_only=mdirs_only,
path=path,
depth=depth)
# note mids/rattrs do _not_ include corrupt btree nodes!
def mids(self, *,
mdirs_only=True,
path=False,
depth=None):
for r in self.mdirs(
mdirs_only=mdirs_only,
path=path,
depth=depth):
if path:
mdir, path_ = r
else:
mdir = r
if isinstance(mdir, Mdir):
for mid, name in mdir.mids():
if path:
yield (mid, mdir, name,
path_+[(mid, mdir, name)])
else:
yield mid, mdir, name
else:
bid, rbyd = mdir
for rid, name in rbyd.rids():
bid_ = bid-(rbyd.weight-1) + rid
mid_ = self.mid(bid_)
mdir_ = (bid_, rbyd, rid)
if path:
yield (mid_, mdir_, name,
path_+[(bid_, rbyd, rid, name)])
else:
yield mid_, mdir_, name
def rattrs(self, mid=None, tag=None, mask=None, *,
mdirs_only=True,
path=False,
depth=None):
if mid is None:
for r in self.mdirs(
mdirs_only=mdirs_only,
path=path,
depth=depth):
if path:
mdir, path_ = r
else:
mdir = r
if isinstance(mdir, Mdir):
for mid, rattr in mdir.rattrs():
if path:
yield (mid, mdir, rattr,
path_+[(mid, mdir, mdir.lookup(mid))])
else:
yield mid, mdir, rattr
else:
bid, rbyd = mdir
for rid, name in rbyd.rids():
bid_ = bid-(rbyd.weight-1) + rid
mid_ = self.mid(bid_)
mdir_ = (bid_, rbyd, rid)
for rattr in rbyd.rattrs(rid):
if path:
yield (mid_, mdir_, rattr,
path_+[(bid_, rbyd, rid, name)])
else:
yield mid_, mdir_, rattr
else:
if not isinstance(mid, Mid):
mid = self.mid(mid)
r = self.lookupleaf(mid,
path=path,
depth=depth)
if path:
mdir, path_ = r
else:
mdir = r
if mdir is None or (
mdirs_only and not isinstance(mdir, Mdir)):
return
if isinstance(mdir, Mdir):
for rattr in mdir.rattrs(mid, tag, mask):
if path:
yield rattr, path_
else:
yield rattr
else:
bid, rbyd, rid = mdir
for rattr in rbyd.rattrs(rid, tag, mask):
if path:
yield rattr, path_
else:
yield rattr
def __iter__(self):
return self.mids()
# lookup by name
def _namelookupleaf(self, did, name, *,
path=False,
depth=None):
if path or depth:
# iterate over mrootchain
path_ = []
for mroot in self.mrootchain:
name = mroot.lookup(-1, TAG_MAGIC)
path_.append((mroot.mid, mroot, name))
# stop here?
if depth and len(path_) >= depth:
if path:
return mroot, path_
else:
return mroot
# no mtree? must be inlined in mroot
if self.mtree is None:
mdir = Mdir(0, self.mroot)
if path:
return mdir, path_
else:
return mdir
# mtree? find name in mtree
else:
# need to do two steps here in case namelookupleaf stops early
r = self.mtree.namelookupleaf(did, name,
path=path or depth,
depth=depth-len(path_) if depth else None)
if path or depth:
bid_, rbyd_, rid_, name_, path__ = r
path_.extend(path__)
else:
bid_, rbyd_, rid_, name_ = r
if bid_ is None:
if path:
return None, path_
else:
return None
# corrupt btree node?
if not rbyd_:
if path:
return (bid_, rbyd_, rid_), path_
else:
return (bid_, rbyd_, rid_)
# stop here? it's not an mdir, but we only return btree nodes
# if explicitly requested
if depth and len(path_) >= depth:
if path:
return (bid_, rbyd_, rid_), path_
else:
return (bid_, rbyd_, rid_)
# fetch the mdir
rattr_ = rbyd_.lookup(rid_, TAG_MDIR, 0x3)
# mdir tag missing? weird
if rattr_ is None:
if path:
return (bid_, rbyd_, rid_), path_
else:
return (bid_, rbyd_, rid_)
blocks_ = frommdir(rattr_.data)
mdir = Mdir.fetch(self.bd, self.mid(bid_), blocks_)
if path:
return mdir, path_
else:
return mdir
def namelookupleaf(self, did, name, *,
mdirs_only=True,
path=False,
depth=None):
# most of the logic is in _namelookupleaf, this just helps
# deduplicate the mdirs_only logic
r = self._namelookupleaf(did, name,
path=path,
depth=depth)
if path:
mdir, path_ = r
else:
mdir = r
if mdir is None or (
mdirs_only and not isinstance(mdir, Mdir)):
if path:
return None, path_
else:
return None
if path:
return mdir, path_
else:
return mdir
def namelookup(self, did, name, *,
path=False,
depth=None):
# lookup the relevant mdir
r = self.namelookupleaf(did, name,
path=path,
depth=depth)
if path:
mdir, path_ = r
else:
mdir = r
if mdir is None:
if path:
return None, None, None, path_
else:
return None, None, None
# find name in mdir
mid_, name_ = mdir.namelookup(did, name)
if mid_ is None:
if path:
return None, None, None, path_
else:
return None, None, None
if path:
return mid_, mdir, name_, path_+[(mid_, mdir, name_)]
else:
return mid_, mdir, name_
# in-btree block pointers
class Bptr:
def __init__(self, rattr, block, off, size, cksize, cksum, ckdata, *,
corrupt=False):
self.rattr = rattr
self.block = block
self.off = off
self.size = size
self.cksize = cksize
self.cksum = cksum
self.ckdata = ckdata
self.corrupt = corrupt
@property
def tag(self):
return self.rattr.tag
@property
def weight(self):
return self.rattr.weight
# this is just for consistency with btrees, rbyds, etc
@property
def blocks(self):
return [self.block]
# try to avoid unnecessary allocations
@ft.cached_property
def data(self):
return self.ckdata[self.off:self.off+self.size]
def addr(self):
return '0x%x.%x' % (self.block, self.off)
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return '%sblock %s w%s %s' % (
'shrub' if self.tag & TAG_SHRUB else '',
self.addr(),
self.weight,
self.size)
# lazily check the cksum
@ft.cached_property
def corrupt(self):
cksum_ = crc32c(self.ckdata)
return (cksum_ != self.cksum)
def __bool__(self):
return not self.corrupt
@classmethod
def fetch(cls, bd, rattr, block, off, size, cksize, cksum):
# seek/read cksize bytes from the block, the actual data should
# always be a subset of cksize
bd.seek(block)
ckdata = bd.read(cksize)
return cls(rattr, block, off, size, cksize, cksum, ckdata)
@classmethod
def fetchck(cls, bd, rattr, blocks, off, size, cksize, cksum):
# fetch the bptr normally
bptr = cls.fetch(bd, rattr, blocks, off, size, cksize, cksum)
# bit of a hack, but this exposes the lazy cksum checker
del bptr.corrupt
return bptr
# yeah, so, this doesn't catch mismatched cksizes, but at least the
# underlying data should be identical assuming no mutation
def __eq__(self, other):
return ((self.block, self.off, self.size)
== (other.block, other.off, other.size))
def __ne__(self, other):
return ((self.block, self.off, self.size)
!= (other.block, other.off, other.size))
def __hash__(self):
return hash((self.block, self.off, self.size))
# lazy config object
class Config:
def __init__(self, mroot):
self.mroot = mroot
# lookup a specific tag
def lookup(self, tag=None, mask=None):
rattr = self.mroot.rbyd.lookup(-1, tag, mask)
if rattr is None:
return None
return self._parse(rattr.tag, rattr)
def __getitem__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key)
def __contains__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key) is not None
def __iter__(self):
for rattr in self.mroot.rbyd.rattrs(-1, TAG_CONFIG, 0xff):
yield self._parse(rattr.tag, rattr)
# common config operations
class Config:
tag = None
mask = None
def __init__(self, mroot, tag, rattr):
# replace tag with what we find
self.tag = tag
# and keep track of rattr
self.rattr = rattr
@property
def block(self):
return self.rattr.block
@property
def blocks(self):
return self.rattr.blocks
@property
def toff(self):
return self.rattr.toff
@property
def tdata(self):
return self.rattr.data
@property
def off(self):
return self.rattr.off
@property
def data(self):
return self.rattr.data
@property
def size(self):
return self.rattr.size
def __bytes__(self):
return self.data
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return self.rattr.repr()
def __iter__(self):
return iter((self.tag, self.data))
def __eq__(self, other):
return (self.tag, self.data) == (other.tag, other.data)
def __ne__(self, other):
return (self.tag, self.data) != (other.tag, other.data)
def __hash__(self):
return hash((self.tag, self.data))
# marker class for unknown config
class Unknown(Config):
pass
# special handling for known configs
# the filesystem magic string
class Magic(Config):
tag = TAG_MAGIC
def repr(self):
return 'magic \"%s\"' % (
''.join(b if b >= ' ' and b <= '~' else '.'
for b in map(chr, self.data)))
# version tuple
class Version(Config):
tag = TAG_VERSION
def __init__(self, mroot, tag, rattr):
super().__init__(mroot, tag, rattr)
d = 0
self.major, d_ = fromleb128(self.data[d:]); d += d_
self.minor, d_ = fromleb128(self.data[d:]); d += d_
@property
def tuple(self):
return (self.major, self.minor)
def repr(self):
return 'version v%s.%s' % (self.major, self.minor)
# compat flags
class Rcompat(Config):
tag = TAG_RCOMPAT
def repr(self):
return 'rcompat 0x%s' % (
''.join('%02x' % f for f in reversed(self.data)))
class Wcompat(Config):
tag = TAG_WCOMPAT
def repr(self):
return 'wcompat 0x%s' % (
''.join('%02x' % f for f in reversed(self.data)))
class Ocompat(Config):
tag = TAG_OCOMPAT
def repr(self):
return 'ocompat 0x%s' % (
''.join('%02x' % f for f in reversed(self.data)))
# block device geometry
class Geometry(Config):
tag = TAG_GEOMETRY
mask = 0x3
def __init__(self, mroot, tag, rattr):
super().__init__(mroot, tag, rattr)
d = 0
block_size, d_ = fromleb128(self.data[d:]); d += d_
block_count, d_ = fromleb128(self.data[d:]); d += d_
# these are offset by 1 to avoid overflow issues
self.block_size = block_size + 1
self.block_count = block_count + 1
def repr(self):
return 'geometry %sx%s' % (self.block_size, self.block_count)
# file name limit
class NameLimit(Config):
tag = TAG_NAMELIMIT
def __init__(self, mroot, tag, rattr):
super().__init__(mroot, tag, rattr)
self.limit, _ = fromleb128(self.data)
def __int__(self):
return self.limit
def repr(self):
return 'namelimit %s' % self.limit
# file size limit
class FileLimit(Config):
tag = TAG_FILELIMIT
def __init__(self, mroot, tag, rattr):
super().__init__(mroot, tag, rattr)
self.limit, _ = fromleb128(self.data)
def __int__(self):
return self.limit
def repr(self):
return 'filelimit %s' % self.limit
# keep track of known configs
_known = [c for c in Config.__subclasses__() if c.tag is not None]
# parse if known
def _parse(self, tag, rattr):
# known config?
for c in self._known:
if (c.tag & ~(c.mask or 0)) == (tag & ~(c.mask or 0)):
return c(self.mroot, tag, rattr)
# otherwise return a marker class
else:
return self.Unknown(self.mroot, tag, rattr)
# create cached accessors for known config
def _parser(c):
def _parser(self):
return self.lookup(c.tag, c.mask)
return _parser
for c in _known:
locals()[c.__name__.lower()] = ft.cached_property(_parser(c))
# lazy gstate object
class Gstate:
def __init__(self, mtree):
self.mtree = mtree
# lookup a specific tag
def lookup(self, tag=None, mask=None):
# collect relevant gdeltas in the mtree
gdeltas = []
for mdir in self.mtree.mdirs():
# gcksumdelta is a bit special since it's outside the
# rbyd tree
if tag == TAG_GCKSUMDELTA:
gdelta = mdir.gcksumdelta
else:
gdelta = mdir.rbyd.lookup(-1, tag, mask)
if gdelta is not None:
gdeltas.append((mdir.mid, gdelta))
# xor to find gstate
return self._parse(tag, gdeltas)
def __getitem__(self, key):
if not isinstance(key, tuple):
key = (key,)
return self.lookup(*key)
def __contains__(self, key):
# note gstate doesn't really "not exist" like normal attrs,
# missing gstate is equivalent to zero gstate, but we can
# still test if there are any gdeltas that match the given
# tag here
if not isinstance(key, tuple):
key = (key,)
return any(
(mdir.gcksumdelta if tag == TAG_GCKSUMDELTA
else mdir.rbyd.lookup(-1, *key))
is not None
for mdir in self.mtree.mdirs())
def __iter__(self):
# first figure out what gstate tags actually exist in the
# filesystem
gtags = set()
for mdir in self.mtree.mdirs():
if mdir.gcksumdelta is not None:
gtags.add(TAG_GCKSUMDELTA)
for rattr in mdir.rbyd.rattrs(-1):
if (rattr.tag & 0xff00) == TAG_GDELTA:
gtags.add(rattr.tag)
# sort to keep things stable, moving gcksum to the front
gtags = sorted(gtags, key=lambda t: (-(t & 0xf000), t))
# compute all gstate in one pass (well, two technically)
gdeltas = {tag: [] for tag in gtags}
for mdir in self.mtree.mdirs():
for tag in gtags:
# gcksumdelta is a bit special since it's outside the
# rbyd tree
if tag == TAG_GCKSUMDELTA:
gdelta = mdir.gcksumdelta
else:
gdelta = mdir.rbyd.lookup(-1, tag)
if gdelta is not None:
gdeltas[tag].append((mdir.mid, gdelta))
for tag in gtags:
# xor to find gstate
yield self._parse(tag, gdeltas[tag])
# common gstate operations
class Gstate:
tag = None
mask = None
def __init__(self, mtree, tag, gdeltas):
# replace tag with what we find
self.tag = tag
# keep track of gdeltas for debugging
self.gdeltas = gdeltas
# xor together to build our gstate
data = bytes()
for mid, gdelta in gdeltas:
data = bytes(
a^b for a, b in it.zip_longest(
data, gdelta.data,
fillvalue=0))
self.data = data
@property
def size(self):
return len(self.data)
def __bytes__(self):
return self.data
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return tagrepr(self.tag, 0, self.size, global_=True)
def __iter__(self):
return iter((self.tag, self.data))
def __eq__(self, other):
return (self.tag, self.data) == (other.tag, other.data)
def __ne__(self, other):
return (self.tag, self.data) != (other.tag, other.data)
def __hash__(self):
return hash((self.tag, self.data))
# marker class for unknown gstate
class Unknown(Gstate):
pass
# special handling for known gstate
# the global-checksum, cubed
class Gcksum(Gstate):
tag = TAG_GCKSUMDELTA
def __init__(self, mtree, tag, gdeltas):
super().__init__(mtree, tag, gdeltas)
self.gcksum = fromle32(self.data)
def __int__(self):
return self.gcksum
def repr(self):
return 'gcksum %08x' % self.gcksum
# any global-removes
class Grm(Gstate):
tag = TAG_GRMDELTA
def __init__(self, mtree, tag, gdeltas):
super().__init__(mtree, tag, gdeltas)
d = 0
count, d_ = fromleb128(self.data[d:]); d += d_
rms = []
if count <= 2:
for _ in range(count):
mid, d_ = fromleb128(self.data[d:]); d += d_
rms.append(mtree.mid(mid))
self.count = count
self.rms = rms
def repr(self):
return 'grm %s' % (
'none' if self.count == 0
else ' '.join(str(mid) for mid in self.rms)
if self.count <= 2
else '0x%x %d' % (count, len(data)))
# keep track of known gstate
_known = [g for g in Gstate.__subclasses__() if g.tag is not None]
# parse if known
def _parse(self, tag, gdeltas):
# known config?
for g in self._known:
if (g.tag & ~(g.mask or 0)) == (tag & ~(g.mask or 0)):
return g(self.mtree, tag, gdeltas)
# otherwise return a marker class
else:
return Unknown(self.mtree, tag, gdeltas)
# create cached accessors for known gstate
def _parser(g):
def _parser(self):
return self.lookup(g.tag, g.mask)
return _parser
for g in _known:
locals()[g.__name__.lower()] = ft.cached_property(_parser(g))
# high-level littlefs representation
class Lfs:
def __init__(self, bd, mtree, config=None, gstate=None, cksum=None, *,
corrupt=False):
self.bd = bd
self.mtree = mtree
# create lazy config/gstate objects
self.config = config or Config(self.mroot)
self.gstate = gstate or Gstate(self.mtree)
# go ahead and fetch some expected fields
self.version = self.config.version
self.rcompat = self.config.rcompat
self.wcompat = self.config.wcompat
self.ocompat = self.config.ocompat
if self.config.geometry is not None:
self.block_count = self.config.geometry.block_count
self.block_size = self.config.geometry.block_size
else:
self.block_count = self.bd.block_count
self.block_size = self.bd.block_size
# calculate on-disk gcksum
if cksum is None:
cksum = 0
for mdir in self.mtree.mdirs():
cksum ^= mdir.cksum
self.cksum = cksum
# is the filesystem corrupt?
self.corrupt = corrupt
# check mroot
if not self.corrupt and not self.ckmroot():
self.corrupt = True
# check magic
if not self.corrupt and not self.ckmagic():
self.corrupt = True
# check gcksum
if not self.corrupt and not self.ckcksum():
self.corrupt = True
# create the root directory, this is a bit of a special case
self.root = self.Root(self)
# mbits is a static value derived from the block_size
@staticmethod
def mbits_(block_size):
return Mtree.mbits_(block_size)
@property
def mbits(self):
return self.mtree.mbits
# convenience function for creating mbits-dependent mids
def mid(self, mbid, mrid=None):
return self.mtree.mid(mbid, mrid)
# most of our fields map to the mtree
@property
def block(self):
return self.mroot.block
@property
def blocks(self):
return self.mroot.blocks
@property
def trunk(self):
return self.mroot.trunk
@property
def rev(self):
return self.mroot.rev
@property
def weight(self):
return self.mtree.weight
@property
def mbweight(self):
return self.mtree.mbweight
@property
def mrweight(self):
return self.mtree.mrweight
def mbweightrepr(self):
return self.mtree.mbweightrepr()
def mrweightrepr(self):
return self.mtree.mrweightrepr()
@property
def mrootchain(self):
return self.mtree.mrootchain
@property
def mrootanchor(self):
return self.mtree.mrootanchor
@property
def mroot(self):
return self.mtree.mroot
def addr(self):
return self.mroot.addr()
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.repr())
def repr(self):
return 'littlefs v%s.%s %sx%s %s w%s.%s' % (
self.version.major if self.version is not None else '?',
self.version.minor if self.version is not None else '?',
self.block_size if self.block_size is not None else '?',
self.block_count if self.block_count is not None else '?',
self.addr(),
self.mbweightrepr(), self.mrweightrepr())
def __bool__(self):
return not self.corrupt
def __eq__(self, other):
return self.mrootanchor == other.mrootanchor
def __ne__(self, other):
return self.mrootanchor != other.mrootanchor
def __hash__(self):
return hash(self.mrootanchor)
@classmethod
def fetch(cls, bd, blocks=None, trunk=None, *,
depth=None):
# Mtree does most of the work here
mtree = Mtree.fetch(bd, blocks, trunk,
depth=depth)
return cls(bd, mtree)
# check that the mroot is valid
def ckmroot(self):
return bool(self.mroot)
# check that the magic string is littlefs
def ckmagic(self):
if self.config.magic is None:
return False
return self.config.magic.data == b'littlefs'
# check that the gcksum checks out
def ckcksum(self):
return crc32ccube(self.cksum) == int(self.gstate.gcksum)
# read custom attrs
def uattrs(self):
return self.mroot.rattrs(-1, TAG_UATTR, 0xff)
def sattrs(self):
return self.mroot.rattrs(-1, TAG_SATTR, 0xff)
def attrs(self):
yield from self.uattrs()
yield from self.sattrs()
# is file in grm queue?
def grmed(self, mid):
if not isinstance(mid, Mid):
mid = self.mid(mid)
return mid in self.gstate.grm.rms
# lookup operations
def lookup(self, mid, mdir=None, *,
all=False):
all_ = all; del all
# is this mid grmed?
if not all_ and self.grmed(mid):
return None
if mdir is None:
mdir, name = self.mtree.lookup(mid)
if mdir is None:
return None
else:
name = mdir.lookup(mid)
# stickynote?
if not all_ and name.tag == TAG_STICKYNOTE:
return None
return self._open(mid, mdir, name.tag, name)
def namelookup(self, did, name, *,
all=False):
all_ = all; del all
mid_, mdir_, name_ = self.mtree.namelookup(did, name)
if mid_ is None:
return None
# is this mid grmed?
if not all_ and self.grmed(mid_):
return None
# stickynote?
if not all_ and name_.tag == TAG_STICKYNOTE:
return None
return self._open(mid_, mdir_, name_.tag, name_)
class PathError(Exception):
pass
# split a path into its components
#
# note this follows littlefs's internal logic, so dots and dotdot
# entries get resolved _before_ walking the path
@staticmethod
def pathsplit(path):
path_ = path
if isinstance(path_, str):
path_ = path_.encode('utf8')
# empty path?
if path_ == b'':
raise Lfs.PathError("invalid path: %r" % path)
path__ = []
for p in path_.split(b'/'):
# skip multiple slashes and dots
if p == b'' or p == b'.':
continue
path__.append(p)
path_ = path__
# resolve dotdots
path__ = []
dotdots = 0
for p in reversed(path_):
if p == b'..':
dotdots += 1
elif dotdots:
dotdots -= 1
else:
path__.append(p)
if dotdots:
raise Lfs.PathError("invalid path: %r" % path)
path__.reverse()
path_ = path__
return path_
def pathlookup(self, did, path_=None, *,
all=False,
path=False,
depth=None):
all_ = all; del all
# default to the root directory
if path_ is None:
did, path_ = 0, did
# parse/split the path
if isinstance(path_, (bytes, str)):
path_ = self.pathsplit(path_)
# start at the root dir
dir = self.root
did = did
if path or depth:
path__ = []
for p in path_:
# lookup the next file
file = self.namelookup(did, p,
all=all_)
if file is None:
if path:
return None, path__
else:
return None
# file? done?
if not file.recursable:
if path:
return file, path__
else:
return file
# recurse down the file tree
dir = file
did = dir.did
if path or depth:
path__.append(dir)
# stop here?
if depth and len(path__) >= depth:
if path:
return None, path__
else:
return None
if path:
return dir, path__
else:
return dir
def files(self, did=None, *,
all=False,
path=False,
depth=None):
all_ = all; del all
# default to the root directory
did = did or self.root.did
# start with the bookmark entry
mid, mdir, name = self.mtree.namelookup(did, b'')
# no bookmark? weird
if mid is None:
return
# iterate over files until we find a different did
while name.did == did:
# yield file, hiding grms, stickynotes, etc, by default
if all_ or (not self.grmed(mid)
and not name.tag == TAG_BOOKMARK
and not name.tag == TAG_STICKYNOTE):
file = self._open(mid, mdir, name.tag, name)
if path:
yield file, []
else:
yield file
# recurse?
if (file.recursable
and depth is not None
and (depth == 0 or depth > 1)):
for r in self.files(file.did,
all=all_,
path=path,
depth=depth-1 if depth else 0):
if path:
file_, path_ = r
yield file_, [file]+path_
else:
file_ = r
yield file_
# increment mid and find the next mdir if needed
mbid, mrid = mid.mbid, mid.mrid + 1
if mrid == mdir.weight:
mbid, mrid = mbid + (1 << self.mbits), 0
mdir = self.mtree.lookupleaf(mbid)
if mdir is None:
break
# lookup name and adjust rid if necessary, you don't
# normally need to do this, but we don't want the iteration
# to terminate early on a corrupt filesystem
mrid, name = mdir.rbyd.lookupnext(mrid)
if mrid is None:
break
mid = self.mid(mbid, mrid)
def __iter__(self):
return self.files()
def orphans(self,
all=False):
all_ = all; del all
# first find all reachable dids
dids = {self.root.did}
for file in self.files(depth=mt.inf):
if file.recursable:
dids.add(file.did)
# then iterate over all dids and yield any that aren't reachable
for mid, mdir, name in self.mtree.mids():
# is this mid grmed?
if not all_ and self.grmed(mid):
continue
# stickynote?
if not all_ and name.tag == TAG_STICKYNOTE:
continue
# unreachable? note this lazily parses the did
if name.did not in dids:
file = self._open(mid, mdir, name.tag, name)
# mark as orphaned
file.orphaned = True
yield file
# common file operations, note Reg extends this for regular files
class File:
tag = None
mask = None
internal = False
recursable = False
grmed = False
orphaned = False
def __init__(self, lfs, mid, mdir, tag, name):
self.lfs = lfs
self.mid = mid
self.mdir = mdir
# replace tag with what we find
self.tag = tag
self.name = name
# fetch the file structure if there is one
self.struct = mdir.lookup(mid, TAG_STRUCT, 0xff)
# bshrub/btree?
self.bshrub = None
if (self.struct is not None
and (self.struct.tag & ~0x3) == TAG_BSHRUB):
weight, trunk = fromshrub(self.struct.data)
self.bshrub = Btree.fetchshrub(lfs.bd, mdir.rbyd, trunk)
elif (self.struct is not None
and (self.struct.tag & ~0x3) == TAG_BTREE):
weight, block, trunk, cksum = frombtree(self.struct.data)
self.bshrub = Btree.fetchck(
lfs.bd, block, trunk, weight, cksum)
# did?
self.did = None
if (self.struct is not None
and self.struct.tag == TAG_DID):
self.did, _ = fromleb128(self.struct.data)
# some other info that is useful for scripts
# mark as grmed if grmed
if lfs.grmed(mid):
self.grmed = True
@property
def size(self):
if self.bshrub is not None:
return self.bshrub.weight
else:
return 0
def structrepr(self):
if self.struct is not None:
# inlined bshrub?
if (self.struct.tag & ~0x3) == TAG_BSHRUB:
return 'bshrub %s' % self.bshrub.addr()
# btree?
elif (self.struct.tag & ~0x3) == TAG_BTREE:
return 'btree %s' % self.bshrub.addr()
# btree?
else:
return str(self.struct)
else:
return ''
def __repr__(self):
return '<%s %s.%s %s>' % (
self.__class__.__name__,
self.mid.mbidrepr(), self.mid.mridrepr(),
self.repr())
def repr(self):
return 'type 0x%02x%s' % (
self.tag & 0xff,
', %s' % self.structrepr()
if self.struct is not None else '')
def __eq__(self, other):
return self.mid == other.mid
def __ne__(self, other):
return self.mid != other.mid
def __hash__(self):
return hash(self.mid)
# read attrs, note this includes _all_ attrs
def rattrs(self):
return self.mdir.rattrs(self.mid)
# read custom attrs
def uattrs(self):
return self.mdir.rattrs(self.mid, TAG_UATTR, 0xff)
def sattrs(self):
return self.mdir.rattrs(self.mid, TAG_SATTR, 0xff)
def attrs(self):
yield from self.uattrs()
yield from self.sattrs()
# lookup data in the underlying bshrub
def _lookupleaf(self, pos, *,
path=False,
depth=None):
# lookup data in our bshrub
r = self.bshrub.lookupleaf(pos,
path=path or depth,
depth=depth)
if path or depth:
bid, rbyd, rid, rattr, path_ = r
else:
bid, rbyd, rid, rattr = r
if bid is None:
if path:
return None, None, path_
else:
return None, None, *path_
# corrupt btree node?
if not rbyd:
if path:
return bid-(rbyd.weight-1), (bid, rbyd, rid), path_
else:
return bid-(rbyd.weight-1), (bid, rbyd, rid)
# stop here?
if depth and len(path_) >= depth:
if path:
return bid-(rattr.weight-1), (bid, rbyd, rid), path_
else:
return bid-(rattr.weight-1), (bid, rbyd, rid)
# inlined data?
if (rattr.tag & ~0x1003) == TAG_DATA:
if path:
return bid-(rattr.weight-1), rattr, path_
else:
return bid-(rattr.weight-1), rattr
# block pointer?
elif (rattr.tag & ~0x1003) == TAG_BLOCK:
size, block, off, cksize, cksum = frombptr(rattr.data)
bptr = Bptr.fetchck(self.lfs.bd, rattr,
block, off, size, cksize, cksum)
if path:
return bid-(rattr.weight-1), bptr, path_
else:
return bid-(rattr.weight-1), bptr
# uh oh, something is broken
else:
if path:
return bid-(rattr.weight-1), rattr, path_
else:
return bid-(rattr.weight-1), rattr
def lookupleaf(self, pos, *,
data_only=True,
path=False,
depth=None):
r = self._lookupleaf(pos,
path=path,
depth=depth)
if path:
pos, data, path_ = r
else:
pos, data = r
if pos is None or (
data_only and not isinstance(data, (Rattr, Bptr))):
if path:
return None, None, path_
else:
return None, None
if path:
return pos, data, path_
else:
return pos, data
def _leaves(self, *,
path=False,
depth=None):
pos = 0
while True:
r = self.lookupleaf(pos,
data_only=False,
path=path,
depth=depth)
if path:
pos, data, path_ = r
else:
pos, data = r
if pos is None:
break
# data?
if isinstance(data, (Rattr, Bptr)):
if path:
yield pos, data, path_
else:
yield pos, data
pos += data.weight
# btree node?
else:
bid, rbyd, rid = data
if path:
yield (pos, (bid-rid + (rbyd.weight-1), rbyd),
path_[:-1])
else:
yield pos, (bid-rid + (rbyd.weight-1), rbyd)
pos += rbyd.weight
def leaves(self, *,
data_only=False,
path=False,
depth=None):
for r in self._leaves(
path=path,
depth=depth):
if path:
pos, data, path_ = r
else:
pos, data = r
if data_only and not isinstance(data, (Rattr, Bptr)):
continue
if path:
yield pos, data, path_
else:
yield pos, data
def _traverse(self, *,
path=False,
depth=None):
ptrunk_ = []
for pos, data, path_ in self.leaves(
path=True,
depth=depth):
# we only care about the data/rbyds here
trunk_ = ([(bid_-rid_, rbyd_)
for bid_, rbyd_, rid_, name_ in path_]
+ [(pos, data)])
for d, (pos, data) in pathdelta(
trunk_, ptrunk_):
# but include branch rids in path if requested
if path:
yield pos, data, path_[:d]
else:
yield pos, data
ptrunk_ = trunk_
def traverse(self, *,
data_only=False,
path=False,
depth=None):
for r in self._traverse(
path=path,
depth=depth):
if path:
pos, data, path_ = r
else:
pos, data = r
if data_only and not isinstance(data, (Rattr, Bptr)):
continue
if path:
yield pos, data, path_
else:
yield pos, data
def datas(self, *,
data_only=True,
path=False,
depth=None):
return self.leaves(
data_only=data_only,
path=path,
depth=depth)
def __iter__(self):
return self.datas()
# some convience operations for reading data
def bytes(self, *,
depth=None):
for pos, data in self.datas(depth=depth):
if data.size > 0:
yield data.data
if data.weight > data.size:
yield b'\0' * (data.weight-data.size)
def read(self, *,
depth=None):
return b''.join(self.bytes())
# bleh, with that out of the way, here are our known file types
# regular files
class Reg(File):
tag = TAG_REG
def repr(self):
return 'reg %s%s' % (
self.size,
', %s' % self.structrepr()
if self.struct is not None else '')
# directories
class Dir(File):
tag = TAG_DIR
def __init__(self, lfs, mid, mdir, tag, name):
super().__init__(lfs, mid, mdir, tag, name)
# we're recursable if we're a non-grmed directory with a did
if (isinstance(self, Lfs.Dir)
and not self.grmed
and self.did is not None):
self.recursable = True
def repr(self):
return 'dir %s%s' % (
'0x%x' % self.did
if self.did is not None else '?',
', %s' % self.structrepr()
if self.struct is not None
and self.struct.tag != TAG_DID else '')
# provide some convenient filesystem access relative to our did
def namelookup(self, name, **args):
if self.did is None:
return None
return self.lfs.namelookup(self.did, name, **args)
def pathlookup(self, path_, **args):
if self.did is None:
if args.get('path'):
return None, []
else:
return None
return self.lfs.pathlookup(self.did, path_, **args)
def files(self, **args):
if self.did is None:
return iter(())
return self.lfs.files(self.did, **args)
# root is a bit special
class Root(Dir):
tag = None
def __init__(self, lfs):
# root always has mid=-1 and did=0
super().__init__(lfs, lfs.mid(-1), lfs.mroot, TAG_DIR, None)
self.did = 0
self.recursable = True
def repr(self):
return 'root'
# bookmarks keep track of where directories start
class Bookmark(File):
tag = TAG_BOOKMARK
internal = True
def repr(self):
return 'bookmark %s%s' % (
'0x%x' % self.name.did
if self.name.did is not None else '?',
', %s' % self.structrepr()
if self.struct is not None else '')
# stickynotes, i.e. uncommitted files, behave the same as files
# for the most part
class Stickynote(File):
tag = TAG_STICKYNOTE
internal = True
def repr(self):
return 'stickynote%s' % (
' %s, %s' % (self.size, self.structrepr())
if self.struct is not None else '')
# marker class for unknown file types
class Unknown(File):
pass
# keep track of known file types
_known = [f for f in File.__subclasses__() if f.tag is not None]
# fetch/parse state if known
def _open(self, mid, mdir, tag, name):
# known file type?
tag = name.tag
for f in self._known:
if (f.tag & ~(f.mask or 0)) == (tag & ~(f.mask or 0)):
return f(self, mid, mdir, tag, name)
# otherwise return a marker class
else:
return self.Unknown(self, mid, mdir, tag, name)
# tree renderer
class TreeArt:
# tree branches are an abstract thing for tree rendering
class Branch(co.namedtuple('Branch', ['a', 'b', 'z', 'color'])):
__slots__ = ()
def __new__(cls, a, b, z=0, color='b'):
# a and b are context specific
return super().__new__(cls, a, b, z, color)
def __repr__(self):
return '%s(%s, %s, %s, %s)' % (
self.__class__.__name__,
self.a,
self.b,
self.z,
self.color)
# don't include color in branch comparisons, or else our tree
# renderings can end up with inconsistent colors between runs
def __eq__(self, other):
return (self.a, self.b, self.z) == (other.a, other.b, other.z)
def __ne__(self, other):
return (self.a, self.b, self.z) != (other.a, other.b, other.z)
def __hash__(self):
return hash((self.a, self.b, self.z))
# also order by z first, which can be useful for reproducibly
# prioritizing branches when simplifying trees
def __lt__(self, other):
return (self.z, self.a, self.b) < (other.z, other.a, other.b)
def __le__(self, other):
return (self.z, self.a, self.b) <= (other.z, other.a, other.b)
def __gt__(self, other):
return (self.z, self.a, self.b) > (other.z, other.a, other.b)
def __ge__(self, other):
return (self.z, self.a, self.b) >= (other.z, other.a, other.b)
# apply a function to a/b while trying to avoid copies
def map(self, filter_, map_=None):
if map_ is None:
filter_, map_ = None, filter_
a = self.a
if filter_ is None or filter_(a):
a = map_(a)
b = self.b
if filter_ is None or filter_(b):
b = map_(b)
if a != self.a or b != self.b:
return self.__class__(
a if a != self.a else self.a,
b if b != self.b else self.b,
self.z,
self.color)
else:
return self
def __init__(self, tree):
self.tree = tree
self.depth = max((t.z+1 for t in tree), default=0)
if self.depth > 0:
self.width = 2*self.depth + 2
else:
self.width = 0
def __iter__(self):
return iter(self.tree)
# render an rbyd rbyd tree for debugging
@classmethod
def _fromrbydrtree(cls, rbyd, **args):
trunks = co.defaultdict(lambda: (-1, 0))
alts = co.defaultdict(lambda: {})
for rid, rattr, path in rbyd.rattrs(path=True):
# keep track of trunks/alts
trunks[rattr.toff] = (rid, rattr.tag)
for ralt in path:
if ralt.followed:
alts[ralt.toff] |= {'f': ralt.joff, 'c': ralt.color}
else:
alts[ralt.toff] |= {'nf': ralt.off, 'c': ralt.color}
if args.get('tree_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
tree = set()
for j, alt in alts.items():
# note all non-trunk edges should be colored black
tree.add(cls.Branch(
alt['nft'],
alt['nft'],
t_depth-1 - alt['h'],
alt['c']))
if alt['ft'] != alt['nft']:
tree.add(cls.Branch(
alt['nft'],
alt['ft'],
t_depth-1 - alt['h'],
'b'))
return cls(tree)
# render an rbyd btree tree for debugging
@classmethod
def _fromrbydbtree(cls, rbyd, **args):
# for rbyds this is just a pointer to every rid
tree = set()
root = None
for rid, name in rbyd.rids():
b = (rid, name.tag)
if root is None:
root = b
tree.add(cls.Branch(root, b))
return cls(tree)
# render an rbyd tree for debugging
@classmethod
def fromrbyd(cls, rbyd, **args):
if args.get('tree_btree'):
return cls._fromrbydbtree(rbyd, **args)
else:
return cls._fromrbydrtree(rbyd, **args)
# render some nice ascii trees
def repr(self, x, color=False):
if self.depth == 0:
return ''
def branchrepr(tree, x, d, was):
for t in tree:
if t.z == d and t.b == x:
if any(t.z == d and t.a == x
for t in tree):
return '+-', t.color, t.color
elif any(t.z == d
and x > min(t.a, t.b)
and x < max(t.a, t.b)
for t in tree):
return '|-', t.color, t.color
elif t.a < t.b:
return '\'-', t.color, t.color
else:
return '.-', t.color, t.color
for t in tree:
if t.z == d and t.a == x:
return '+ ', t.color, None
for t in tree:
if (t.z == d
and x > min(t.a, t.b)
and x < max(t.a, t.b)):
return '| ', t.color, was
if was:
return '--', was, was
return ' ', None, None
trunk = []
was = None
for d in range(self.depth):
t, c, was = branchrepr(self.tree, x, 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 == self.depth-1 else '',
'\x1b[m' if color and c else ''))
return '%s ' % ''.join(trunk)
# some more renderers
# render a btree rbyd tree for debugging
@classmethod
def _frombtreertree(cls, btree, *,
depth=None,
inner=False,
**args):
# precompute rbyd trees so we know the max depth at each layer
# to nicely align trees
rtrees = {}
rdepths = {}
for bid, rbyd, path in btree.traverse(path=True, depth=depth):
if not rbyd:
continue
rtree = cls.fromrbyd(rbyd, **args)
rtrees[rbyd] = rtree
rdepths[len(path)] = max(rdepths.get(len(path), 0), rtree.depth)
# map rbyd branches into our btree space
tree = set()
for bid, rbyd, path in btree.traverse(path=True, depth=depth):
if not rbyd:
continue
# yes we can find new rbyds if disk is being mutated, just
# ignore these
if rbyd not in rtrees:
continue
rtree = rtrees[rbyd]
rz = max((t.z+1 for t in rtree), default=0)
d = sum(rdepths[d]+1 for d in range(len(path)))
# map into our btree space
for t in rtree:
# note we adjust our bid to be left-leaning, this allows
# a global order and makes tree rendering quite a bit easier
a_rid, a_tag = t.a
b_rid, b_tag = t.b
_, (_, a_w, _) = rbyd.lookupnext(a_rid)
_, (_, b_w, _) = rbyd.lookupnext(b_rid)
tree.add(cls.Branch(
(bid-(rbyd.weight-1)+a_rid-(a_w-1), len(path), a_tag),
(bid-(rbyd.weight-1)+b_rid-(b_w-1), len(path), b_tag),
d + rdepths[len(path)]-rz + t.z,
t.color))
# connect rbyd branches to rbyd roots
if path:
l_bid, l_rbyd, l_rid, l_name = path[-1]
l_branch = l_rbyd.lookup(l_rid, TAG_BRANCH, 0x3)
if rtree:
r_rid, r_tag = min(rtree, key=lambda t: t.z).a
_, (_, r_w, _) = rbyd.lookupnext(r_rid)
else:
r_rid, (r_tag, r_w, _) = rbyd.lookupnext(-1)
tree.add(cls.Branch(
(l_bid-(l_name.weight-1), len(path)-1, l_branch.tag),
(bid-(rbyd.weight-1)+r_rid-(r_w-1), len(path), r_tag),
d-1))
# remap branches to leaves if we aren't showing inner branches
if not inner:
# step through each btree layer backwards
b_depth = max((t.a[1]+1 for t in tree), default=0)
for d in reversed(range(b_depth-1)):
# find bid ranges at this level
bids = set()
for t in tree:
if t.b[1] == d:
bids.add(t.b[0])
bids = sorted(bids)
# find the best root for each bid range
roots = {}
for i in range(len(bids)):
for t in tree:
if (t.a[1] > d
and t.a[0] >= bids[i]
and (i == len(bids)-1 or t.a[0] < bids[i+1])
and (bids[i] not in roots
or t < roots[bids[i]])):
roots[bids[i]] = t
# remap branches to leaf-roots
tree = {t.map(
lambda x: x[1] == d and x[0] in roots,
lambda x: roots[x[0]].a)
for t in tree}
return cls(tree)
# render a btree btree tree for debugging
@classmethod
def _frombtreebtree(cls, btree, *,
depth=None,
inner=False,
**args):
# find all branches
tree = set()
root = None
branches = {}
for bid, name, path in btree.bids(
path=True,
depth=depth):
# create branch for each jump in path
#
# note we adjust our bid to be left-leaning, this allows
# a global order and makes tree rendering quite a bit easier
a = root
for d, (bid_, rbyd_, rid_, name_) in enumerate(path):
# map into our btree space
bid__ = bid_-(name_.weight-1)
b = (bid__, d, name_.tag)
# remap branches to leaves if we aren't showing inner
# branches
if not inner:
if b not in branches:
bid_, rbyd_, rid_, name_ = path[-1]
bid__ = bid_-(name_.weight-1)
branches[b] = (bid__, len(path)-1, name_.tag)
b = branches[b]
# render the root path on first rid, this is arbitrary
if root is None:
root, a = b, b
tree.add(cls.Branch(a, b, d))
a = b
return cls(tree)
# render a btree tree for debugging
@classmethod
def frombtree(cls, btree, **args):
if args.get('tree_btree'):
return cls._frombtreebtree(btree, **args)
else:
return cls._frombtreertree(btree, **args)
# render a file tree for debugging
@classmethod
def fromfile(cls, file, **args):
tree = cls.frombtree(file.bshrub, **args)
t_depth = tree.depth
# connect bptr tags to bptrs
tree = set(tree)
bptrs = {}
for pos, data, path in file.datas(
path=True,
depth=args.get('depth')):
if isinstance(data, Bptr):
a = (pos, len(path)-1, data.tag)
b = (pos, len(path), data.tag)
bptrs[a] = b
tree.add(cls.Branch(a, b, t_depth))
# if we're not showing inner branches, nudge bptr tags to
# their bptrs
if not args.get('inner'):
tree = {t.map(lambda x: bptrs.get(x, x)) for t in tree}
return cls(tree)
# show the littlefs config
def dbg_config(lfs,
color=False,
w_width=2,
**args):
for i, config in enumerate(it.chain(
lfs.config,
lfs.attrs())):
# some special situations worth reporting
notes = []
# magic corrupt?
if (config.tag == TAG_MAGIC
and config.data != b'littlefs'):
notes.append('magic!=littlefs')
print('%s%12s %*s %-*s %s%s%s' % (
'\x1b[31m' if color and notes else '',
'{%s}:' % ','.join('%04x' % block
for block in config.blocks)
if i == 0 else '',
2*w_width+1, '%d.%d' % (-1, -1)
if i == 0 else '',
21+w_width, config.repr(),
next(xxd(config.data, 8), '')
if not args.get('raw')
and not args.get('no_truncate')
else '',
' (%s)' % ', '.join(notes) if notes else '',
'\x1b[m' if color and notes else ''))
# show on-disk encoding
if args.get('raw') or args.get('no_truncate'):
for o, line in enumerate(xxd(config.data)):
print('%11s: %*s %s' % (
'%04x' % (config.toff + o*16),
2*w_width+1, '',
line))
# show the littlefs gstate
def dbg_gstate(lfs,
color=False,
w_width=2,
**args):
for i, gstate in enumerate(lfs.gstate):
# some special situations worth reporting
notes = []
# gcksum mismatch?
if (gstate.tag == TAG_GCKSUMDELTA
and int(gstate) != crc32ccube(lfs.cksum)):
notes.append('gcksum!=%08x' % crc32ccube(lfs.cksum))
print('%s%12s %*s %-*s %s%s%s' % (
'\x1b[31m' if color and notes else '',
'gstate:'
if i == 0 or args.get('gdelta')
else '',
2*w_width+1, 'g.-1'
if i == 0 or args.get('gdelta')
else '',
21+w_width, gstate.repr(),
next(xxd(gstate.data, 8), '')
if not args.get('raw')
and not args.get('no_truncate')
else '',
' (%s)' % ', '.join(notes) if notes else '',
'\x1b[m' if color and notes else ''))
# show on-disk encoding
if args.get('raw') or args.get('no_truncate'):
for o, line in enumerate(xxd(gstate.data)):
print('%11s: %*s %s' % (
'%04x' % (o*16),
2*w_width+1, '',
line))
# print gdeltas?
if args.get('gdelta'):
for mid, gdelta in gstate.gdeltas:
print('%s%12s %*s %-*s %s%s' % (
'\x1b[90m' if color else '',
'{%s}:' % ','.join('%04x' % block
for block in gdelta.blocks),
2*w_width+1, mid.repr(),
21+w_width, gdelta.repr(),
next(xxd(gdelta.data, 8), '')
if not args.get('raw')
and not args.get('no_truncate')
else '',
'\x1b[m' if color else ''))
# show on-disk encoding
if args.get('raw'):
for o, line in enumerate(xxd(gdelta.tdata)):
print('%11s: %*s %s' % (
'%04x' % (gdelta.toff + o*16),
2*w_width+1, '',
line))
if args.get('raw') or args.get('no_truncate'):
for o, line in enumerate(xxd(gdelta.data)):
print('%11s: %*s %s' % (
'%04x' % (gdelta.off + o*16),
2*w_width+1, '',
line))
# show the littlefs file tree
def dbg_files(lfs, paths,
color=False,
w_width=2,
recurse=None,
all=False,
no_orphans=False,
**args):
all_ = all; del all
# parse all paths first, error if anything is malformed
dirs = []
# default paths to the root dir
for path in (paths or ['/']):
try:
dir = lfs.pathlookup(path,
all=args.get('all'))
except Lfs.PathError as e:
print("error: %s" % e,
file=sys.stderr)
sys.exit(-1)
if dir is not None:
dirs.append(dir)
# it's kinda tricky to iterate over everything we want to show,
# so create a reusable iterator
def iter_dir(dir, **args_):
if dir.recursable:
yield from dir.files(**args_)
else:
if args_.get('path'):
yield dir, []
else:
yield dir
# include any orphaned entries in the root directory to help
# debugging (these don't actually live in the root directory)
if not no_orphans and isinstance(dir, Lfs.Root):
# finding orphans is expensive, so cache this
if not hasattr(iter_dir, 'orphans'):
iter_dir.orphans = dir.lfs.orphans()
for orphan in iter_dir.orphans:
if args_.get('path'):
yield orphan, []
else:
yield orphan
# do a pass to figure out the width+depth of the file tree
# and file names so we can format things nicely
f_depth, f_width = 0, 0
for dir in dirs:
for file, path in iter_dir(dir,
all=all_,
depth=recurse,
path=True):
f_depth = max(f_depth, len(path)+1)
f_width = max(f_width, 4*len(path) + len(file.name.name))
# only show the mdir/rbyd/block address on mdir change
pblock = None
# recursively print directories
def dbg_dir(dir,
depth,
prefixes=('', '', '', '')):
nonlocal pblock
# first figure out the dir length so we know when the dir ends
if prefixes != ('', '', '', ''):
len_ = sum(1 for _ in iter_dir(dir, all=all_))
else:
len_ = 1
# print files
for i, file in enumerate(iter_dir(dir, all=all_)):
# some special situations worth reporting
notes = []
# grmed?
if file.grmed:
notes.append('grmed')
# orphaned?
if file.orphaned:
notes.append('orphaned')
# missing bookmark/did?
if isinstance(file, Lfs.Dir):
if file.did is None:
notes.append('missing did')
elif lfs.namelookup(file.did, b'') is None:
notes.append('missing bookmark')
# print human readable file entry
print('%s%12s %*s %-*s %s%s%s' % (
'\x1b[31m'
if color and not file.grmed and notes
else '\x1b[90m'
if color and (file.grmed or file.internal)
else '',
'{%s}:' % ','.join('%04x' % block
for block in file.mdir.blocks)
if pblock is None or file.mdir.block != pblock else '',
2*w_width+1, file.mid.repr(),
f_width, '%s%s' % (
prefixes[0+(i==len_-1)],
file.name.name.decode('utf8',
errors='backslashreplace')),
file.repr(),
' (%s)' % ', '.join(notes) if notes else '',
'\x1b[m'
if color and (notes or file.grmed or file.internal)
else ''))
pblock = file.mdir.block
# print attrs associated with each file?
if args.get('attrs'):
for rattr in file.rattrs():
print('%12s %*s %-*s %s' % (
'',
2*w_width+1, '',
21+w_width, rattr.repr(),
next(xxd(rattr.data, 8), '')
if not args.get('raw')
and not args.get('no_truncate')
else ''))
# show on-disk encoding
if args.get('raw'):
for o, line in enumerate(xxd(rattr.tdata)):
print('%11s: %*s %s' % (
'%04x' % (rattr.toff + o*16),
2*w_width+1, '',
line))
if args.get('raw') or args.get('no_truncate'):
for o, line in enumerate(xxd(rattr.data)):
print('%11s: %*s %s' % (
'%04x' % (rattr.off + o*16),
2*w_width+1, '',
line))
# print file structures?
if args.get('structs'):
dbg_struct(file)
# recurse?
if (file.recursable
and depth is not None
and (depth == 0 or depth > 1)):
dbg_dir(file,
depth-1 if depth else 0,
(prefixes[2+(i==len_-1)] + "|-> ",
prefixes[2+(i==len_-1)] + "'-> ",
prefixes[2+(i==len_-1)] + "| ",
prefixes[2+(i==len_-1)] + " "))
# print file structures
def dbg_struct(file):
nonlocal pblock
# no tree?
if file.bshrub is None:
return
# precompute tree renderings
bt_width = 0
if (args.get('tree')
or args.get('tree_rbyd')
or args.get('tree_btree')):
treeart = TreeArt.fromfile(file, **args)
bt_width = treeart.width
# dynamically size the id field
bw_width = mt.ceil(mt.log10(max(1, file.size)+1))
# recursively print bshrub branches
def dbg_branch(d, bid, rbyd, rid, name):
nonlocal pblock
for rattr in rbyd.rattrs(rid):
print('%12s %*s %s%*s %-*s %s' % (
'%04x.%04x:' % (rbyd.block, rbyd.trunk)
if pblock is None or rbyd.block != pblock
else '',
2*w_width+1, '',
treeart.repr(
(bid-(name.weight-1), d, rattr.tag),
color)
if args.get('tree')
or args.get('tree_rbyd')
or args.get('tree_btree')
else '',
2*bw_width+1, '%d-%d' % (bid-(rattr.weight-1), bid)
if rattr.weight > 1
else bid if rattr.weight > 0
else '',
21+2*bw_width+1, rattr.repr(),
next(xxd(rattr.data, 8), '')
if not args.get('raw')
and not args.get('no_truncate')
else ''))
pblock = rbyd.block
# show on-disk encoding of tags/data
if args.get('raw'):
for o, line in enumerate(xxd(rattr.tdata)):
print('%11s: %*s %*s%*s %s' % (
'%04x' % (rattr.toff + o*16),
2*w_width+1, '',
bt_width, '',
2*bw_width+1, '',
line))
if args.get('raw') or args.get('no_truncate'):
for o, line in enumerate(xxd(rattr.data)):
print('%11s: %*s %*s%*s %s' % (
'%04x' % (rattr.off + o*16),
2*w_width+1, '',
bt_width, '',
2*bw_width+1, '',
line))
# print inlined data, block pointers, etc
def dbg_bptr(d, pos, bptr):
nonlocal pblock
# some special situations worth reporting
notes = []
# cksum mismatch?
cksum = crc32c(bptr.ckdata)
if cksum != bptr.cksum:
notes.append('cksum!=%08x' % bptr.cksum)
print('%s%12s%s %*s %s%s%s%-*s%s%s' % (
'\x1b[31m' if color and notes else '',
'%04x.%04x:' % (bptr.block, bptr.off)
if pblock is None or bptr.block != pblock
else '',
'\x1b[0m' if color and notes else '',
2*w_width+1, '',
treeart.repr((pos, d, bptr.tag), color)
if args.get('tree')
or args.get('tree_rbyd')
or args.get('tree_btree')
else '',
'\x1b[31m' if color and notes else '',
'%*s ' % (
2*bw_width+1, '%d-%d' % (pos, pos+(bptr.weight-1))
if bptr.weight > 1
else pos if bptr.weight > 0
else ''),
56+2*bw_width+1, '%-*s %s' % (
21+2*bw_width+1, bptr.repr(),
next(xxd(bptr.data, 8), '')
if not args.get('raw')
and not args.get('no_truncate')
else ''),
' (%s)' % ', '.join(notes) if notes else '',
'\x1b[m' if color and notes else ''))
pblock = bptr.block
# show on-disk encoding of tag/bptr/data
if args.get('raw'):
for o, line in enumerate(xxd(bptr.rattr.tdata)):
print('%11s: %*s %*s%s%s' % (
'%04x' % (bptr.rattr.toff + o*16),
2*w_width+1, '',
bt_width, '',
'%*s ' % (2*bw_width+1, ''),
line))
if args.get('raw'):
for o, line in enumerate(xxd(bptr.rattr.data)):
print('%11s: %*s %*s%s%s' % (
'%04x' % (bptr.rattr.off + o*16),
2*w_width+1, '',
bt_width, '',
'%*s ' % (2*bw_width+1, ''),
line))
if args.get('raw') or args.get('no_truncate'):
for o, line in enumerate(xxd(bptr.data)):
print('%11s: %*s %*s%s%s' % (
'%04x.%04x' % (bptr.block, bptr.off + o*16)
if o == 0 and bptr.block != pblock
else '%04x' % (bptr.off + o*16),
2*w_width+1, '',
bt_width, '',
'%*s ' % (2*bw_width+1, ''),
line))
# traverse and print entries
ppath = []
for pos, data, path in file.leaves(
path=True,
depth=args.get('depth')):
# print inner branches if requested
if args.get('inner'):
for d, (bid_, rbyd_, rid_, name_) in pathdelta(
path, ppath):
dbg_branch(d, bid_, rbyd_, rid_, name_)
ppath = path
# inlined data?
if isinstance(data, Rattr):
# a bit of a hack
if not args.get('inner'):
bid_, rbyd_, rid_, name_ = path[-1]
dbg_branch(len(path)-1, bid_, rbyd_, rid_, data)
# block pointer?
elif isinstance(data, Bptr):
# show the data
dbg_bptr(len(path), pos, data)
# btree node?
else:
bid, rbyd = data
# corrupted? try to keep printing the tree
if not rbyd:
print('%11s: %*s %*s%s%s%s' % (
'%04x.%04x' % (rbyd.block, rbyd.trunk),
2*w_width+1, '',
bt_width, '',
'\x1b[31m' if color else '',
'(corrupted rbyd %s)' % rbyd.addr(),
'\x1b[m' if color else ''))
pblock = rbyd.block
continue
for rid, name in rbyd.rids():
bid_ = bid-(rbyd.weight-1) + rid
# show the leaf entry/branch
dbg_branch(len(path), bid_, rbyd, rid, name)
# print stuff
for dir in dirs:
dbg_dir(dir, recurse)
def main(disk, mroots=None, paths=None, *,
trunk=None,
block_size=None,
block_count=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
# show files be default, but there's quite a few other things we
# can show if requested
show_config = args.get('config')
show_gstate = (args.get('gstate')
or args.get('gdelta'))
show_files = (args.get('files')
or args.get('structs')
or args.get('attrs'))
if (not show_config
and not show_gstate
and not show_files):
show_files = True
# 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 mroots, default to 0x{0,1}
mroots = list(it.chain.from_iterable(mroots)) if mroots else [0, 1]
# mroots may also encode trunks
mroots, trunk = (
[block[0] if isinstance(block, tuple)
else block
for block in mroots],
trunk if trunk is not None
else ft.reduce(
lambda x, y: y,
(block[1] for block in mroots
if isinstance(block, tuple)),
None))
# we seek around a bunch, so just keep the disk open
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()
# fetch the filesystem
bd = Bd(f, block_size, block_count)
lfs = Lfs.fetch(bd, mroots, trunk)
# print some information about the filesystem
print('littlefs%s v%s.%s %sx%s %s w%s.%s, rev %08x, cksum %08x%s' % (
'' if lfs.ckmagic() else '?',
lfs.version.major if lfs.version is not None else '?',
lfs.version.minor if lfs.version is not None else '?',
lfs.block_size if lfs.block_size is not None else '?',
lfs.block_count if lfs.block_count is not None else '?',
lfs.addr(),
lfs.mbweightrepr(), lfs.mrweightrepr(),
lfs.rev,
lfs.cksum,
'' if lfs.ckcksum() else '?'))
# dynamically size the id field
w_width = max(
mt.ceil(mt.log10(max(1, lfs.mbweight >> lfs.mbits)+1)),
mt.ceil(mt.log10(max(1, max(
mdir.weight for mdir in lfs.mtree.mdirs())))+1),
# in case of -1.-1
2)
# show the on-disk config?
if show_config:
dbg_config(lfs,
color=color,
w_width=w_width,
**args)
# show the on-disk gstate?
if show_gstate:
dbg_gstate(lfs,
color=color,
w_width=w_width,
**args)
# show the on-disk file tree?
if show_files:
dbg_files(lfs, paths,
color=color,
w_width=w_width,
**args)
# is the filesystem corrupt?
corrupted = not bool(lfs)
if args.get('error_on_corrupt') and corrupted:
sys.exit(2)
if __name__ == "__main__":
import argparse
import sys
parser = argparse.ArgumentParser(
description="Debug littlefs stuff.",
allow_abbrev=False)
parser.add_argument(
'disk',
help="File containing the block device.")
class AppendMrootOrPath(argparse.Action):
def __call__(self, parser, namespace, values, option):
for value in values:
# mroot?
if not isinstance(value, str):
if getattr(namespace, 'mroots', None) is None:
namespace.mroots = []
namespace.mroots.append(value)
# or path?
else:
if getattr(namespace, 'paths', None) is None:
namespace.paths = []
namespace.paths.append(value)
parser.add_argument(
'mroots',
nargs='*',
type=lambda x: rbydaddr(x) if not x.startswith('/') else x,
action=AppendMrootOrPath,
help="Block address of the mroots. Defaults to 0x{0,1}.")
parser.add_argument(
'paths',
nargs='*',
type=lambda x: rbydaddr(x) if not x.startswith('/') else x,
action=AppendMrootOrPath,
help="Paths to show, must start with a leading slash. Defaults "
"to the root directory.")
parser.add_argument(
'--trunk',
type=lambda x: int(x, 0),
help="Use this offset as the trunk of the mroots.")
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(
'--color',
choices=['never', 'always', 'auto'],
default='auto',
help="When to use terminal colors. Defaults to 'auto'.")
parser.add_argument(
'--config',
action='store_true',
help="Show the on-disk config.")
parser.add_argument(
'--gstate',
action='store_true',
help="Show the on-disk global-state.")
parser.add_argument(
'--gdelta',
action='store_true',
help="Show relevant gdeltas used to build the gstate. "
"Implies --gstate.")
parser.add_argument(
'--files',
action='store_true',
help="Show the file tree (the default).")
parser.add_argument(
'--structs',
action='store_true',
help="Show the internal structure of files. Implies --files.")
parser.add_argument(
'--attrs',
action='store_true',
help="Show custom attributes attached to files. Implies --files.")
parser.add_argument(
'-r', '--recurse', '--file-depth',
nargs='?',
type=lambda x: int(x, 0),
const=0,
help="Depth of the file tree to show. 0 shows all files in the "
"filesystem. Defaults to 1, which only shows the root "
"directory.")
parser.add_argument(
'-a', '--all',
action='store_true',
help="Show all files including bookmarks, stickynotes, grms, "
"etc.")
parser.add_argument(
'--no-orphans',
action='store_true',
help="Don't scan for orphaned files.")
parser.add_argument(
'-x', '--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', '--tree-rbyd',
action='store_true',
help="Show the full rbyd tree.")
parser.add_argument(
'-B', '--tree-btree',
action='store_true',
help="Show a simplified btree tree.")
parser.add_argument(
'-i', '--inner',
action='store_true',
help="Show inner branches.")
parser.add_argument(
'-z', '--depth', '--tree-depth',
nargs='?',
type=lambda x: int(x, 0),
const=0,
help="Depth of trees to show. Defaults to 0, which shows full "
"trees.")
parser.add_argument(
'-e', '--error-on-corrupt',
action='store_true',
help="Error if the filesystem is corrupt.")
sys.exit(main(**{k: v
for k, v in vars(parser.parse_intermixed_args()).items()
if v is not None}))
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