xref: /openbmc/qemu/scripts/qmp/qom-fuse (revision f713ed4f) 
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        try:
49            path, prop = path.rsplit('/', 1)
50            for item in self.qmp.command('qom-list', path=path):
51                if item['name'] == prop:
52                    return True
53            return False
54        except:
55            return False
56
57    def is_link(self, path):
58        try:
59            path, prop = path.rsplit('/', 1)
60            for item in self.qmp.command('qom-list', path=path):
61                if item['name'] == prop:
62                    if item['type'].startswith('link<'):
63                        return True
64                    return False
65            return False
66        except:
67            return False
68
69    def read(self, path, length, offset, fh):
70        if not self.is_property(path):
71            return -ENOENT
72
73        path, prop = path.rsplit('/', 1)
74        try:
75            data = self.qmp.command('qom-get', path=path, property=prop)
76            data += '\n' # make values shell friendly
77        except:
78            raise FuseOSError(EPERM)
79
80        if offset > len(data):
81            return ''
82
83        return bytes(data[offset:][:length], encoding='utf-8')
84
85    def readlink(self, path):
86        if not self.is_link(path):
87            return False
88        path, prop = path.rsplit('/', 1)
89        prefix = '/'.join(['..'] * (len(path.split('/')) - 1))
90        return prefix + str(self.qmp.command('qom-get', path=path,
91                                             property=prop))
92
93    def getattr(self, path, fh=None):
94        if self.is_link(path):
95            value = { 'st_mode': 0o755 | stat.S_IFLNK,
96                      'st_ino': self.get_ino(path),
97                      'st_dev': 0,
98                      'st_nlink': 2,
99                      'st_uid': 1000,
100                      'st_gid': 1000,
101                      'st_size': 4096,
102                      'st_atime': 0,
103                      'st_mtime': 0,
104                      'st_ctime': 0 }
105        elif self.is_object(path):
106            value = { 'st_mode': 0o755 | stat.S_IFDIR,
107                      'st_ino': self.get_ino(path),
108                      'st_dev': 0,
109                      'st_nlink': 2,
110                      'st_uid': 1000,
111                      'st_gid': 1000,
112                      'st_size': 4096,
113                      'st_atime': 0,
114                      'st_mtime': 0,
115                      'st_ctime': 0 }
116        elif self.is_property(path):
117            value = { 'st_mode': 0o644 | stat.S_IFREG,
118                      'st_ino': self.get_ino(path),
119                      'st_dev': 0,
120                      'st_nlink': 1,
121                      'st_uid': 1000,
122                      'st_gid': 1000,
123                      'st_size': 4096,
124                      'st_atime': 0,
125                      'st_mtime': 0,
126                      'st_ctime': 0 }
127        else:
128            raise FuseOSError(ENOENT)
129        return value
130
131    def readdir(self, path, fh):
132        yield '.'
133        yield '..'
134        for item in self.qmp.command('qom-list', path=path):
135            yield str(item['name'])
136
137if __name__ == '__main__':
138    import os
139
140    fuse = FUSE(QOMFS(QEMUMonitorProtocol(os.environ['QMP_SOCKET'])),
141                sys.argv[1], foreground=True)
142