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"""
QEMU Object Model FUSE filesystem tool
This script offers a simple FUSE filesystem within which the QOM tree
may be browsed, queried and edited using traditional shell tooling.
This script requires the 'fusepy' python package.
usage: qom-fuse [-h] [--socket SOCKET] <mount>
Mount a QOM tree as a FUSE filesystem
positional arguments:
<mount> Mount point
optional arguments:
-h, --help show this help message and exit
--socket SOCKET, -s SOCKET
QMP socket path or address (addr:port). May also be
set via QMP_SOCKET environment variable.
"""
##
# Copyright IBM, Corp. 2012
# Copyright (C) 2020 Red Hat, Inc.
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
# Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.
##
import argparse
from errno import ENOENT, EPERM
import stat
import sys
from typing import (
IO,
Dict,
Iterator,
Mapping,
Optional,
Union,
)
import fuse
from fuse import FUSE, FuseOSError, Operations
from qemu.qmp import ExecuteError
from .qom_common import QOMCommand
fuse.fuse_python_api = (0, 2)
class QOMFuse(QOMCommand, Operations):
"""
QOMFuse implements both fuse.Operations and QOMCommand.
Operations implements the FS, and QOMCommand implements the CLI command.
"""
name = 'fuse'
help = 'Mount a QOM tree as a FUSE filesystem'
fuse: FUSE
@classmethod
def configure_parser(cls, parser: argparse.ArgumentParser) -> None:
super().configure_parser(parser)
parser.add_argument(
'mount',
metavar='<mount>',
action='store',
help="Mount point",
)
def __init__(self, args: argparse.Namespace):
super().__init__(args)
self.mount = args.mount
self.ino_map: Dict[str, int] = {}
self.ino_count = 1
def run(self) -> int:
print(f"Mounting QOMFS to '{self.mount}'", file=sys.stderr)
self.fuse = FUSE(self, self.mount, foreground=True)
return 0
def get_ino(self, path: str) -> int:
"""Get an inode number for a given QOM path."""
if path in self.ino_map:
return self.ino_map[path]
self.ino_map[path] = self.ino_count
self.ino_count += 1
return self.ino_map[path]
def is_object(self, path: str) -> bool:
"""Is the given QOM path an object?"""
try:
self.qom_list(path)
return True
except ExecuteError:
return False
def is_property(self, path: str) -> bool:
"""Is the given QOM path a property?"""
path, prop = path.rsplit('/', 1)
if path == '':
path = '/'
try:
for item in self.qom_list(path):
if item.name == prop:
return True
return False
except ExecuteError:
return False
def is_link(self, path: str) -> bool:
"""Is the given QOM path a link?"""
path, prop = path.rsplit('/', 1)
if path == '':
path = '/'
try:
for item in self.qom_list(path):
if item.name == prop and item.link:
return True
return False
except ExecuteError:
return False
def read(self, path: str, size: int, offset: int, fh: IO[bytes]) -> bytes:
if not self.is_property(path):
raise FuseOSError(ENOENT)
path, prop = path.rsplit('/', 1)
if path == '':
path = '/'
try:
data = str(self.qmp.cmd('qom-get', path=path, property=prop))
data += '\n' # make values shell friendly
except ExecuteError as err:
raise FuseOSError(EPERM) from err
if offset > len(data):
return b''
return bytes(data[offset:][:size], encoding='utf-8')
def readlink(self, path: str) -> Union[bool, str]:
if not self.is_link(path):
return False
path, prop = path.rsplit('/', 1)
prefix = '/'.join(['..'] * (len(path.split('/')) - 1))
return prefix + str(self.qmp.cmd('qom-get', path=path,
property=prop))
def getattr(self, path: str,
fh: Optional[IO[bytes]] = None) -> Mapping[str, object]:
if self.is_link(path):
value = {
'st_mode': 0o755 | stat.S_IFLNK,
'st_ino': self.get_ino(path),
'st_dev': 0,
'st_nlink': 2,
'st_uid': 1000,
'st_gid': 1000,
'st_size': 4096,
'st_atime': 0,
'st_mtime': 0,
'st_ctime': 0
}
elif self.is_object(path):
value = {
'st_mode': 0o755 | stat.S_IFDIR,
'st_ino': self.get_ino(path),
'st_dev': 0,
'st_nlink': 2,
'st_uid': 1000,
'st_gid': 1000,
'st_size': 4096,
'st_atime': 0,
'st_mtime': 0,
'st_ctime': 0
}
elif self.is_property(path):
value = {
'st_mode': 0o644 | stat.S_IFREG,
'st_ino': self.get_ino(path),
'st_dev': 0,
'st_nlink': 1,
'st_uid': 1000,
'st_gid': 1000,
'st_size': 4096,
'st_atime': 0,
'st_mtime': 0,
'st_ctime': 0
}
else:
raise FuseOSError(ENOENT)
return value
def readdir(self, path: str, fh: IO[bytes]) -> Iterator[str]:
yield '.'
yield '..'
for item in self.qom_list(path):
yield item.name
|
