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262ad7c08e26d2f13f11598555fc7b163a342bb7
littlefs/scripts/dbgflags.py
Christopher Haster 262ad7c08e scripts: Simplified dbgtag.py, tweaked -x/--hex decoding 
This drops the option to read tags from a disk file. I don't think I've
ever used this, and it requires quite a bit of circuitry to implement.

Also dropped -s/--string, because most tags can't be represented as
strings?

And tweaked -x/--hex flags to correctly parse spaces in arguments, so
now these are equivalent:

- ./scripts/dbgtag.py -x 00 03 00 08
- ./scripts/dbgtag.py -x "00 03 00 08"
2025-04-16 15:21:54 -05:00

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#!/usr/bin/env python3
# prevent local imports
if __name__ == "__main__":
__import__('sys').path.pop(0)
import collections as co
ALIASES = [
{'O', 'OPEN'},
{'A', 'ATTR'},
{'F', 'FORMAT'},
{'M', 'MOUNT'},
{'GC'},
{'I', 'INFO'},
{'T', 'TRAVERSAL'},
{'RC', 'RCOMPAT'},
{'WC', 'WCOMPAT'},
{'OC', 'OCOMPAT'}
]
FLAGS = [
# File open flags
('O', 'MODE', 3, "The file's access mode" ),
('^', 'RDONLY', 0, "Open a file as read only" ),
('^', 'WRONLY', 1, "Open a file as write only" ),
('^', 'RDWR', 2, "Open a file as read and write" ),
('O', 'CREAT', 0x00000004, "Create a file if it does not exist" ),
('O', 'EXCL', 0x00000008, "Fail if a file already exists" ),
('O', 'TRUNC', 0x00000010, "Truncate the existing file to zero size" ),
('O', 'APPEND', 0x00000020, "Move to end of file on every write" ),
('O', 'FLUSH', 0x00000040, "Flush data on every write" ),
('O', 'SYNC', 0x00000080, "Sync metadata on every write" ),
('O', 'DESYNC', 0x00000100, "Do not sync or recieve file updates" ),
('O', 'CKMETA', 0x00100000, "Check metadata checksums" ),
('O', 'CKDATA', 0x00200000, "Check metadata + data checksums" ),
('o', 'TYPE', 0xf0000000, "The file's type" ),
('^', 'REG', 0x10000000, "Type = regular-file" ),
('^', 'DIR', 0x20000000, "Type = directory" ),
('^', 'BOOKMARK', 0x40000000, "Type = bookmark" ),
('^', 'STICKYNOTE',0x50000000, "Type = stickynote" ),
('^', 'TRAVERSAL', 0x90000000, "Type = traversal" ),
('o', 'UNFLUSH', 0x01000000, "File's data does not match disk" ),
('o', 'UNSYNC', 0x02000000, "File's metadata does not match disk" ),
('o', 'UNCREAT', 0x04000000, "File does not exist yet" ),
('o', 'ZOMBIE', 0x08000000, "File has been removed" ),
# Custom attribute flags
('A', 'MODE', 3, "The attr's access mode" ),
('^', 'RDONLY', 0, "Open an attr as read only" ),
('^', 'WRONLY', 1, "Open an attr as write only" ),
('^', 'RDWR', 2, "Open an attr as read and write" ),
('A', 'LAZY', 0x04, "Only write attr if file changed" ),
# Filesystem format flags
('F', 'MODE', 1, "Format's access mode" ),
('^', 'RDWR', 0, "Format the filesystem as read and write" ),
('F', 'NOISY', 0x00000010, "Add noise to revision counts" ),
('F', 'CKPROGS', 0x00000800, "Check progs by reading back progged data" ),
('F', 'CKFETCHES', 0x00001000, "Check block checksums before first use" ),
('F', 'CKPARITY', 0x00002000, "Check metadata tag parity bits" ),
('F', 'CKDATACKSUMS',
0x00008000, "Check data checksums on reads" ),
('F', 'CKMETA', 0x00100000, "Check metadata checksums" ),
('F', 'CKDATA', 0x00200000, "Check metadata + data checksums" ),
# Filesystem mount flags
('M', 'MODE', 1, "Mount's access mode" ),
('^', 'RDWR', 0, "Mount the filesystem as read and write" ),
('^', 'RDONLY', 1, "Mount the filesystem as read only" ),
('M', 'FLUSH', 0x00000040, "Open all files with LFS_O_FLUSH" ),
('M', 'SYNC', 0x00000080, "Open all files with LFS_O_SYNC" ),
('M', 'NOISY', 0x00000010, "Add noise to revision counts" ),
('M', 'CKPROGS', 0x00000800, "Check progs by reading back progged data" ),
('M', 'CKFETCHES', 0x00001000, "Check block checksums before first use" ),
('M', 'CKPARITY', 0x00002000, "Check metadata tag parity bits" ),
('M', 'CKDATACKSUMS',
0x00008000, "Check data checksums on reads" ),
('M', 'MKCONSISTENT',
0x00010000, "Make the filesystem consistent" ),
('M', 'LOOKAHEAD', 0x00020000, "Populate lookahead buffer" ),
('M', 'COMPACT', 0x00080000, "Compact metadata logs" ),
('M', 'CKMETA', 0x00100000, "Check metadata checksums" ),
('M', 'CKDATA', 0x00200000, "Check metadata + data checksums" ),
# GC flags
('GC', 'MKCONSISTENT',
0x00010000, "Make the filesystem consistent" ),
('GC', 'LOOKAHEAD',0x00020000, "Populate lookahead buffer" ),
('GC', 'COMPACT', 0x00080000, "Compact metadata logs" ),
('GC', 'CKMETA', 0x00100000, "Check metadata checksums" ),
('GC', 'CKDATA', 0x00200000, "Check metadata + data checksums" ),
# Filesystem info flags
('I', 'RDONLY', 0x00000001, "Mounted read only" ),
('I', 'FLUSH', 0x00000040, "Mounted with LFS_M_FLUSH" ),
('I', 'SYNC', 0x00000080, "Mounted with LFS_M_SYNC" ),
('I', 'NOISY', 0x00000010, "Mounted with LFS_M_NOISY" ),
('I', 'CKPROGS', 0x00000800, "Mounted with LFS_M_CKPROGS" ),
('I', 'CKFETCHES', 0x00001000, "Mounted with LFS_M_CKFETCHES" ),
('I', 'CKPARITY', 0x00002000, "Mounted with LFS_M_CKPARITY" ),
('I', 'CKDATACKSUMS',
0x00008000, "Mounted with LFS_M_CKDATACKSUMS" ),
('I', 'MKCONSISTENT',
0x00010000, "Filesystem needs mkconsistent to write" ),
('I', 'LOOKAHEAD', 0x00020000, "Lookahead buffer is not full" ),
('I', 'COMPACT', 0x00080000, "Filesystem may have uncompacted metadata" ),
('I', 'CKMETA', 0x00100000, "Metadata checksums not checked recently" ),
('I', 'CKDATA', 0x00200000, "Data checksums not checked recently" ),
# Traversal flags
('T', 'MTREEONLY', 0x00000010, "Only traverse the mtree" ),
('T', 'MKCONSISTENT',
0x00010000, "Make the filesystem consistent" ),
('T', 'LOOKAHEAD', 0x00020000, "Populate lookahead buffer" ),
('T', 'COMPACT', 0x00080000, "Compact metadata logs" ),
('T', 'CKMETA', 0x00100000, "Check metadata checksums" ),
('T', 'CKDATA', 0x00200000, "Check metadata + data checksums" ),
('t', 'TYPE', 0xf0000000, "The file's type" ),
('^', 'REG', 0x10000000, "Type = regular-file" ),
('^', 'DIR', 0x20000000, "Type = directory" ),
('^', 'BOOKMARK', 0x40000000, "Type = bookmark" ),
('^', 'STICKYNOTE',0x50000000, "Type = stickynote" ),
('^', 'TRAVERSAL', 0x90000000, "Type = traversal" ),
('t', 'TSTATE', 0x0000000f, "The traversal's current tstate" ),
('^', 'MROOTANCHOR',
0x00000000, "Tstate = mroot-anchor" ),
('^', 'MROOTCHAIN',0x00000001, "Tstate = mroot-chain" ),
('^', 'MTREE', 0x00000002, "Tstate = mtree" ),
('^', 'MDIRS', 0x00000003, "Tstate = mtree-mdirs" ),
('^', 'MDIR', 0x00000004, "Tstate = mdir" ),
('^', 'BTREE', 0x00000005, "Tstate = btree" ),
('^', 'OMDIRS', 0x00000006, "Tstate = open-mdirs" ),
('^', 'OBTREE', 0x00000007, "Tstate = open-btree" ),
('^', 'DONE', 0x00000008, "Tstate = done" ),
('t', 'BTYPE', 0x00000f00, "The traversal's current btype" ),
('^', 'MDIR', 0x00000100, "Btype = mdir" ),
('^', 'BTREE', 0x00000200, "Btype = btree" ),
('^', 'DATA', 0x00000300, "Btype = data" ),
('t', 'DIRTY', 0x01000000, "Filesystem modified during traversal" ),
('t', 'MUTATED', 0x02000000, "Filesystem modified by traversal" ),
('t', 'ZOMBIE', 0x08000000, "File has been removed" ),
# Read-compat flags
('RCOMPAT', 'NONSTANDARD',
0x00000001, "Non-standard filesystem format" ),
('RCOMPAT', 'WRONLY',
0x00000002, "Reading is disallowed" ),
('RCOMPAT', 'GRM',
0x00000004, "Global-remove in use" ),
('RCOMPAT', 'MMOSS',
0x00000010, "May use an inlined mdir" ),
('RCOMPAT', 'MSPROUT',
0x00000020, "May use an mdir pointer" ),
('RCOMPAT', 'MSHRUB',
0x00000040, "May use an inlined mtree" ),
('RCOMPAT', 'MTREE',
0x00000080, "May use an mdir btree" ),
('RCOMPAT', 'BMOSS',
0x00000100, "Files may use inlined data" ),
('RCOMPAT', 'BSPROUT',
0x00000200, "Files may use block pointers" ),
('RCOMPAT', 'BSHRUB',
0x00000400, "Files may use inlined btrees" ),
('RCOMPAT', 'BTREE',
0x00000800, "Files may use btrees" ),
('rcompat', 'OVERFLOW',
0x80000000, "Can't represent all flags" ),
# Write-compat flags
('WCOMPAT', 'NONSTANDARD',
0x00000001, "Non-standard filesystem format" ),
('WCOMPAT', 'RDONLY',
0x00000002, "Writing is disallowed" ),
('WCOMPAT', 'GCKSUM',
0x00000004, "Global-checksum in use" ),
('wcompat', 'OVERFLOW',
0x80000000, "Can't represent all flags" ),
# Optional-compat flags
('OCOMPAT', 'NONSTANDARD',
0x00000001, "Non-standard filesystem format" ),
('ocompat', 'OVERFLOW',
0x80000000, "Can't represent all flags" ),
]
def main(flags, *,
list=False,
all=False):
import builtins
list_, list = list, builtins.list
all_, all = all, builtins.all
# first compile prefixes
prefixes = {}
for a in ALIASES:
for k in a:
prefixes[k] = a
for p, n, f, h in FLAGS:
if p not in prefixes:
prefixes[p] = {p}
# only look at specific prefix?
flags_ = []
prefix = set()
for f in flags:
if f.upper() in prefixes:
prefix.update(prefixes[f.upper()])
else:
flags_.append(f)
# filter by prefix
flags__ = []
types__ = co.defaultdict(lambda: set())
for p, n, f, h in FLAGS:
if p == '^':
p = last_p
t = last_t
types__[p].add(t)
else:
t = None
last_p = p
last_t = f
if not prefix or p.upper() in prefix:
flags__.append((p, t, n, f, h))
lines = []
# list all known flags
if list_:
for p, t, n, f, h in flags__:
if not all_ and (t is not None or p[0].islower()):
continue
lines.append(('LFS_%s_%s' % (p, n), '0x%08x' % f, h))
# find flags by name or value
else:
for f_ in flags_:
found = False
# find by LFS_+prefix+_+name
for p, t, n, f, h in flags__:
if 'LFS_%s_%s' % (p, n) == f_.upper():
lines.append(('LFS_%s_%s' % (p, n), '0x%08x' % f, h))
found = True
if found:
continue
# find by prefix+_+name
for p, t, n, f, h in flags__:
if '%s_%s' % (p, n) == f_.upper():
lines.append(('LFS_%s_%s' % (p, n), '0x%08x' % f, h))
found = True
if found:
continue
# find by name
for p, t, n, f, h in flags__:
if n == f_.upper():
lines.append(('LFS_%s_%s' % (p, n), '0x%08x' % f, h))
found = True
if found:
continue
# find by value
try:
f__ = int(f_, 0)
f___ = f__
for p, t, n, f, h in flags__:
# ignore type masks here
if t is None and f in types__[p]:
continue
# matches flag?
if t is None and (f__ & f) == f:
lines.append(('LFS_%s_%s' % (p, n), '0x%08x' % f, h))
f___ &= ~f
# matches type?
elif t is not None and (f__ & t) == f:
lines.append(('LFS_%s_%s' % (p, n), '0x%08x' % f, h))
f___ &= ~t
if f___:
lines.append(('?', '0x%08x' % f___, 'Unknown flags'))
except ValueError:
lines.append(('?', f_, 'Unknown flag'))
# first find widths
w = [0, 0]
for l in lines:
w[0] = max(w[0], len(l[0]))
w[1] = max(w[1], len(l[1]))
# then print results
for l in lines:
print('%-*s %-*s %s' % (
w[0], l[0],
w[1], l[1],
l[2]))
if __name__ == "__main__":
import argparse
import sys
parser = argparse.ArgumentParser(
description="Decode littlefs flags.",
allow_abbrev=False)
class AppendFlags(argparse.Action):
def __call__(self, parser, namespace, value, option):
if getattr(namespace, 'flags', None) is None:
namespace.flags = []
if value is None:
pass
elif isinstance(value, str):
namespace.flags.append(value)
else:
namespace.flags.extend(value)
parser.add_argument(
'prefix',
nargs='?',
action=AppendFlags,
help="Flag prefix to consider, defaults to all flags.")
parser.add_argument(
'flags',
nargs='*',
action=AppendFlags,
help="Flags or names of flags to decode.")
parser.add_argument(
'-l', '--list',
action='store_true',
help="List all known flags.")
parser.add_argument(
'-a', '--all',
action='store_true',
help="Also show internal flags and types.")
sys.exit(main(**{k: v
for k, v in vars(parser.parse_intermixed_args()).items()
if v is not None}))
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