mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 16:14:16 +01:00
262 lines
9.7 KiB
Python
Executable File
262 lines
9.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import struct
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import sys
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import json
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import io
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import itertools as it
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from readmdir import Tag, MetadataPair
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def popc(x):
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return bin(x).count('1')
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def ctz(x):
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return len(bin(x)) - len(bin(x).rstrip('0'))
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def dumpentries(args, mdir, f):
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for k, id_ in enumerate(mdir.ids):
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name = mdir[Tag('name', id_, 0)]
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struct_ = mdir[Tag('struct', id_, 0)]
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f.write("id %d %s %s" % (
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id_, name.typerepr(),
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json.dumps(name.data.decode('utf8'))))
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if struct_.is_('dirstruct'):
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f.write(" dir {%#x, %#x}" % struct.unpack(
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'<II', struct_.data[:8].ljust(8, b'\xff')))
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if struct_.is_('ctzstruct'):
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f.write(" ctz {%#x} size %d" % struct.unpack(
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'<II', struct_.data[:8].ljust(8, b'\xff')))
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if struct_.is_('inlinestruct'):
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f.write(" inline size %d" % struct_.size)
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f.write("\n")
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if args.data and struct_.is_('inlinestruct'):
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for i in range(0, len(struct_.data), 16):
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f.write(" %08x: %-47s %-16s\n" % (
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i, ' '.join('%02x' % c for c in struct_.data[i:i+16]),
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''.join(c if c >= ' ' and c <= '~' else '.'
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for c in map(chr, struct_.data[i:i+16]))))
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elif args.data and struct_.is_('ctzstruct'):
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block, size = struct.unpack(
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'<II', struct_.data[:8].ljust(8, b'\xff'))
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data = []
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i = 0 if size == 0 else (size-1) // (args.block_size - 8)
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if i != 0:
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i = ((size-1) - 4*popc(i-1)+2) // (args.block_size - 8)
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with open(args.disk, 'rb') as f2:
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while i >= 0:
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f2.seek(block * args.block_size)
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dat = f2.read(args.block_size)
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data.append(dat[4*(ctz(i)+1) if i != 0 else 0:])
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block, = struct.unpack('<I', dat[:4].ljust(4, b'\xff'))
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i -= 1
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data = bytes(it.islice(
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it.chain.from_iterable(reversed(data)), size))
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for i in range(0, min(len(data), 256)
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if not args.no_truncate else len(data), 16):
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f.write(" %08x: %-47s %-16s\n" % (
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i, ' '.join('%02x' % c for c in data[i:i+16]),
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''.join(c if c >= ' ' and c <= '~' else '.'
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for c in map(chr, data[i:i+16]))))
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for tag in mdir.tags:
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if tag.id==id_ and tag.is_('userattr'):
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f.write("id %d %s size %d\n" % (
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id_, tag.typerepr(), tag.size))
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if args.data:
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for i in range(0, len(tag.data), 16):
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f.write(" %-47s %-16s\n" % (
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' '.join('%02x' % c for c in tag.data[i:i+16]),
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''.join(c if c >= ' ' and c <= '~' else '.'
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for c in map(chr, tag.data[i:i+16]))))
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def main(args):
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with open(args.disk, 'rb') as f:
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dirs = []
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superblock = None
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gstate = b''
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mdirs = []
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cycle = False
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tail = (args.block1, args.block2)
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hard = False
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while True:
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for m in it.chain((m for d in dirs for m in d), mdirs):
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if set(m.blocks) == set(tail):
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# cycle detected
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cycle = m.blocks
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if cycle:
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break
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# load mdir
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data = []
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blocks = {}
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for block in tail:
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f.seek(block * args.block_size)
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data.append(f.read(args.block_size)
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.ljust(args.block_size, b'\xff'))
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blocks[id(data[-1])] = block
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mdir = MetadataPair(data)
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mdir.blocks = tuple(blocks[id(p.data)] for p in mdir.pair)
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# fetch some key metadata as a we scan
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try:
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mdir.tail = mdir[Tag('tail', 0, 0)]
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if mdir.tail.size != 8 or mdir.tail.data == 8*b'\xff':
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mdir.tail = None
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except KeyError:
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mdir.tail = None
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# have superblock?
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try:
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nsuperblock = mdir[
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Tag(0x7ff, 0x3ff, 0), Tag('superblock', 0, 0)]
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superblock = nsuperblock, mdir[Tag('inlinestruct', 0, 0)]
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except KeyError:
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pass
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# have gstate?
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try:
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ngstate = mdir[Tag('movestate', 0, 0)]
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gstate = bytes((a or 0) ^ (b or 0)
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for a,b in it.zip_longest(gstate, ngstate.data))
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except KeyError:
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pass
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# add to directories
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mdirs.append(mdir)
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if mdir.tail is None or not mdir.tail.is_('hardtail'):
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dirs.append(mdirs)
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mdirs = []
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if mdir.tail is None:
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break
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tail = struct.unpack('<II', mdir.tail.data)
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hard = mdir.tail.is_('hardtail')
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# find paths
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dirtable = {}
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for dir in dirs:
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dirtable[frozenset(dir[0].blocks)] = dir
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pending = [("/", dirs[0])]
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while pending:
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path, dir = pending.pop(0)
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for mdir in dir:
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for tag in mdir.tags:
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if tag.is_('dir'):
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try:
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npath = tag.data.decode('utf8')
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dirstruct = mdir[Tag('dirstruct', tag.id, 0)]
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nblocks = struct.unpack('<II', dirstruct.data)
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nmdir = dirtable[frozenset(nblocks)]
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pending.append(((path + '/' + npath), nmdir))
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except KeyError:
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pass
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dir[0].path = path.replace('//', '/')
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# dump tree
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if not args.superblock and not args.gstate and not args.mdirs:
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args.superblock = True
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args.gstate = True
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args.mdirs = True
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if args.superblock and superblock:
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print("superblock %s v%d.%d" % (
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json.dumps(superblock[0].data.decode('utf8')),
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struct.unpack('<H', superblock[1].data[2:2+2])[0],
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struct.unpack('<H', superblock[1].data[0:0+2])[0]))
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print(
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" block_size %d\n"
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" block_count %d\n"
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" name_max %d\n"
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" file_max %d\n"
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" attr_max %d" % struct.unpack(
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'<IIIII', superblock[1].data[4:4+20].ljust(20, b'\xff')))
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if args.gstate and gstate:
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print("gstate 0x%s" % ''.join('%02x' % c for c in gstate))
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tag = Tag(struct.unpack('<I', gstate[0:4].ljust(4, b'\xff'))[0])
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blocks = struct.unpack('<II', gstate[4:4+8].ljust(8, b'\xff'))
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if tag.size:
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print(" orphans %d" % tag.size)
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if tag.type:
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print(" move dir {%#x, %#x} id %d" % (
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blocks[0], blocks[1], tag.id))
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if args.mdirs:
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for i, dir in enumerate(dirs):
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print("dir %s" % (json.dumps(dir[0].path)
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if hasattr(dir[0], 'path') else '(orphan)'))
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for j, mdir in enumerate(dir):
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print("mdir {%#x, %#x} rev %d%s" % (
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mdir.blocks[0], mdir.blocks[1], mdir.rev,
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' (corrupted)' if not mdir else ''))
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f = io.StringIO()
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if args.tags:
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mdir.dump_tags(f, truncate=not args.no_truncate)
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elif args.log:
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mdir.dump_log(f, truncate=not args.no_truncate)
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elif args.all:
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mdir.dump_all(f, truncate=not args.no_truncate)
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else:
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dumpentries(args, mdir, f)
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lines = list(filter(None, f.getvalue().split('\n')))
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for k, line in enumerate(lines):
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print("%s %s" % (
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' ' if j == len(dir)-1 else
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'v' if k == len(lines)-1 else
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'|',
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line))
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if cycle:
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print("*** cycle detected! -> {%#x, %#x} ***" % (cycle[0], cycle[1]))
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if cycle:
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return 2
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elif not all(mdir for dir in dirs for mdir in dir):
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return 1
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else:
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return 0;
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if __name__ == "__main__":
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import argparse
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import sys
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parser = argparse.ArgumentParser(
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description="Dump semantic info about the metadata tree in littlefs")
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parser.add_argument('disk',
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help="File representing the block device.")
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parser.add_argument('block_size', type=lambda x: int(x, 0),
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help="Size of a block in bytes.")
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parser.add_argument('block1', nargs='?', default=0,
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type=lambda x: int(x, 0),
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help="Optional first block address for finding the root.")
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parser.add_argument('block2', nargs='?', default=1,
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type=lambda x: int(x, 0),
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help="Optional second block address for finding the root.")
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parser.add_argument('-s', '--superblock', action='store_true',
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help="Show contents of the superblock.")
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parser.add_argument('-g', '--gstate', action='store_true',
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help="Show contents of global-state.")
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parser.add_argument('-m', '--mdirs', action='store_true',
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help="Show contents of metadata-pairs/directories.")
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parser.add_argument('-t', '--tags', action='store_true',
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help="Show metadata tags instead of reconstructing entries.")
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parser.add_argument('-l', '--log', action='store_true',
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help="Show tags in log.")
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parser.add_argument('-a', '--all', action='store_true',
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help="Show all tags in log, included tags in corrupted commits.")
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parser.add_argument('-d', '--data', action='store_true',
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help="Also show the raw contents of files/attrs/tags.")
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parser.add_argument('-T', '--no-truncate', action='store_true',
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help="Don't truncate large amounts of data.")
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sys.exit(main(parser.parse_args()))
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