xref: /openbmc/qemu/scripts/qmp/qom-fuse (revision c6b7eae9) 
1#!/usr/bin/env python3
2##
3# QEMU Object Model test tools
4#
5# Copyright IBM, Corp. 2012
6# Copyright (C) 2020 Red Hat, Inc.
7#
8# Authors:
9#  Anthony Liguori   <aliguori@us.ibm.com>
10#  Markus Armbruster <armbru@redhat.com>
11#
12# This work is licensed under the terms of the GNU GPL, version 2 or later.  See
13# the COPYING file in the top-level directory.
14##
15
16from errno import *
17import os
18import posix
19import stat
20import sys
21
22import fuse
23from fuse import FUSE, FuseOSError, Operations
24
25
26sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
27from qemu.qmp import QEMUMonitorProtocol
28
29
30fuse.fuse_python_api = (0, 2)
31
32class QOMFS(Operations):
33    def __init__(self, qmp):
34        self.qmp = qmp
35        self.qmp.connect()
36        self.ino_map = {}
37        self.ino_count = 1
38
39    def get_ino(self, path):
40        if path in self.ino_map:
41            return self.ino_map[path]
42        self.ino_map[path] = self.ino_count
43        self.ino_count += 1
44        return self.ino_map[path]
45
46    def is_object(self, path):
47        try:
48            items = self.qmp.command('qom-list', path=path)
49            return True
50        except:
51            return False
52
53    def is_property(self, path):
54        path, prop = path.rsplit('/', 1)
55        if path == '':
56            path = '/'
57        try:
58            for item in self.qmp.command('qom-list', path=path):
59                if item['name'] == prop:
60                    return True
61            return False
62        except:
63            return False
64
65    def is_link(self, path):
66        path, prop = path.rsplit('/', 1)
67        if path == '':
68            path = '/'
69        try:
70            for item in self.qmp.command('qom-list', path=path):
71                if item['name'] == prop:
72                    if item['type'].startswith('link<'):
73                        return True
74                    return False
75            return False
76        except:
77            return False
78
79    def read(self, path, length, offset, fh):
80        if not self.is_property(path):
81            return -ENOENT
82
83        path, prop = path.rsplit('/', 1)
84        if path == '':
85            path = '/'
86        try:
87            data = self.qmp.command('qom-get', path=path, property=prop)
88            data += '\n' # make values shell friendly
89        except:
90            raise FuseOSError(EPERM)
91
92        if offset > len(data):
93            return ''
94
95        return bytes(data[offset:][:length], encoding='utf-8')
96
97    def readlink(self, path):
98        if not self.is_link(path):
99            return False
100        path, prop = path.rsplit('/', 1)
101        prefix = '/'.join(['..'] * (len(path.split('/')) - 1))
102        return prefix + str(self.qmp.command('qom-get', path=path,
103                                             property=prop))
104
105    def getattr(self, path, fh=None):
106        if self.is_link(path):
107            value = { 'st_mode': 0o755 | stat.S_IFLNK,
108                      'st_ino': self.get_ino(path),
109                      'st_dev': 0,
110                      'st_nlink': 2,
111                      'st_uid': 1000,
112                      'st_gid': 1000,
113                      'st_size': 4096,
114                      'st_atime': 0,
115                      'st_mtime': 0,
116                      'st_ctime': 0 }
117        elif self.is_object(path):
118            value = { 'st_mode': 0o755 | stat.S_IFDIR,
119                      'st_ino': self.get_ino(path),
120                      'st_dev': 0,
121                      'st_nlink': 2,
122                      'st_uid': 1000,
123                      'st_gid': 1000,
124                      'st_size': 4096,
125                      'st_atime': 0,
126                      'st_mtime': 0,
127                      'st_ctime': 0 }
128        elif self.is_property(path):
129            value = { 'st_mode': 0o644 | stat.S_IFREG,
130                      'st_ino': self.get_ino(path),
131                      'st_dev': 0,
132                      'st_nlink': 1,
133                      'st_uid': 1000,
134                      'st_gid': 1000,
135                      'st_size': 4096,
136                      'st_atime': 0,
137                      'st_mtime': 0,
138                      'st_ctime': 0 }
139        else:
140            raise FuseOSError(ENOENT)
141        return value
142
143    def readdir(self, path, fh):
144        yield '.'
145        yield '..'
146        for item in self.qmp.command('qom-list', path=path):
147            yield str(item['name'])
148
149if __name__ == '__main__':
150    import os
151
152    fuse = FUSE(QOMFS(QEMUMonitorProtocol(os.environ['QMP_SOCKET'])),
153                sys.argv[1], foreground=True)
154