xref: /openbmc/qemu/scripts/qmp/qom-fuse (revision 7f6c3d1a) 
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
16import fuse, stat
17from fuse import FUSE, FuseOSError, Operations
18import os, posix, sys
19from errno import *
20
21sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
22from qemu.qmp import QEMUMonitorProtocol
23
24fuse.fuse_python_api = (0, 2)
25
26class QOMFS(Operations):
27    def __init__(self, qmp):
28        self.qmp = qmp
29        self.qmp.connect()
30        self.ino_map = {}
31        self.ino_count = 1
32
33    def get_ino(self, path):
34        if path in self.ino_map:
35            return self.ino_map[path]
36        self.ino_map[path] = self.ino_count
37        self.ino_count += 1
38        return self.ino_map[path]
39
40    def is_object(self, path):
41        try:
42            items = self.qmp.command('qom-list', path=path)
43            return True
44        except:
45            return False
46
47    def is_property(self, path):
48        path, prop = path.rsplit('/', 1)
49        if path == '':
50            path = '/'
51        try:
52            for item in self.qmp.command('qom-list', path=path):
53                if item['name'] == prop:
54                    return True
55            return False
56        except:
57            return False
58
59    def is_link(self, path):
60        path, prop = path.rsplit('/', 1)
61        if path == '':
62            path = '/'
63        try:
64            for item in self.qmp.command('qom-list', path=path):
65                if item['name'] == prop:
66                    if item['type'].startswith('link<'):
67                        return True
68                    return False
69            return False
70        except:
71            return False
72
73    def read(self, path, length, offset, fh):
74        if not self.is_property(path):
75            return -ENOENT
76
77        path, prop = path.rsplit('/', 1)
78        if path == '':
79            path = '/'
80        try:
81            data = self.qmp.command('qom-get', path=path, property=prop)
82            data += '\n' # make values shell friendly
83        except:
84            raise FuseOSError(EPERM)
85
86        if offset > len(data):
87            return ''
88
89        return bytes(data[offset:][:length], encoding='utf-8')
90
91    def readlink(self, path):
92        if not self.is_link(path):
93            return False
94        path, prop = path.rsplit('/', 1)
95        prefix = '/'.join(['..'] * (len(path.split('/')) - 1))
96        return prefix + str(self.qmp.command('qom-get', path=path,
97                                             property=prop))
98
99    def getattr(self, path, fh=None):
100        if self.is_link(path):
101            value = { 'st_mode': 0o755 | stat.S_IFLNK,
102                      'st_ino': self.get_ino(path),
103                      'st_dev': 0,
104                      'st_nlink': 2,
105                      'st_uid': 1000,
106                      'st_gid': 1000,
107                      'st_size': 4096,
108                      'st_atime': 0,
109                      'st_mtime': 0,
110                      'st_ctime': 0 }
111        elif self.is_object(path):
112            value = { 'st_mode': 0o755 | stat.S_IFDIR,
113                      'st_ino': self.get_ino(path),
114                      'st_dev': 0,
115                      'st_nlink': 2,
116                      'st_uid': 1000,
117                      'st_gid': 1000,
118                      'st_size': 4096,
119                      'st_atime': 0,
120                      'st_mtime': 0,
121                      'st_ctime': 0 }
122        elif self.is_property(path):
123            value = { 'st_mode': 0o644 | stat.S_IFREG,
124                      'st_ino': self.get_ino(path),
125                      'st_dev': 0,
126                      'st_nlink': 1,
127                      'st_uid': 1000,
128                      'st_gid': 1000,
129                      'st_size': 4096,
130                      'st_atime': 0,
131                      'st_mtime': 0,
132                      'st_ctime': 0 }
133        else:
134            raise FuseOSError(ENOENT)
135        return value
136
137    def readdir(self, path, fh):
138        yield '.'
139        yield '..'
140        for item in self.qmp.command('qom-list', path=path):
141            yield str(item['name'])
142
143if __name__ == '__main__':
144    import os
145
146    fuse = FUSE(QOMFS(QEMUMonitorProtocol(os.environ['QMP_SOCKET'])),
147                sys.argv[1], foreground=True)
148