xref: /openbmc/qemu/scripts/qmp/qom-fuse (revision 98d11a6e) 
1#!/usr/bin/python
2##
3# QEMU Object Model test tools
4#
5# Copyright IBM, Corp. 2012
6#
7# Authors:
8#  Anthony Liguori   <aliguori@us.ibm.com>
9#
10# This work is licensed under the terms of the GNU GPL, version 2 or later.  See
11# the COPYING file in the top-level directory.
12##
13
14from __future__ import absolute_import
15import fuse, stat
16from fuse import Fuse
17import os, posix
18from errno import *
19from .qmp import QEMUMonitorProtocol
20
21fuse.fuse_python_api = (0, 2)
22
23class QOMFS(Fuse):
24    def __init__(self, qmp, *args, **kwds):
25        Fuse.__init__(self, *args, **kwds)
26        self.qmp = qmp
27        self.qmp.connect()
28        self.ino_map = {}
29        self.ino_count = 1
30
31    def get_ino(self, path):
32        if path in self.ino_map:
33            return self.ino_map[path]
34        self.ino_map[path] = self.ino_count
35        self.ino_count += 1
36        return self.ino_map[path]
37
38    def is_object(self, path):
39        try:
40            items = self.qmp.command('qom-list', path=path)
41            return True
42        except:
43            return False
44
45    def is_property(self, path):
46        try:
47            path, prop = path.rsplit('/', 1)
48            for item in self.qmp.command('qom-list', path=path):
49                if item['name'] == prop:
50                    return True
51            return False
52        except:
53            return False
54
55    def is_link(self, path):
56        try:
57            path, prop = path.rsplit('/', 1)
58            for item in self.qmp.command('qom-list', path=path):
59                if item['name'] == prop:
60                    if item['type'].startswith('link<'):
61                        return True
62                    return False
63            return False
64        except:
65            return False
66
67    def read(self, path, length, offset):
68        if not self.is_property(path):
69            return -ENOENT
70
71        path, prop = path.rsplit('/', 1)
72        try:
73            data = str(self.qmp.command('qom-get', path=path, property=prop))
74            data += '\n' # make values shell friendly
75        except:
76            return -EPERM
77
78        if offset > len(data):
79            return ''
80
81        return str(data[offset:][:length])
82
83    def readlink(self, path):
84        if not self.is_link(path):
85            return False
86        path, prop = path.rsplit('/', 1)
87        prefix = '/'.join(['..'] * (len(path.split('/')) - 1))
88        return prefix + str(self.qmp.command('qom-get', path=path,
89                                             property=prop))
90
91    def getattr(self, path):
92        if self.is_link(path):
93            value = posix.stat_result((0o755 | stat.S_IFLNK,
94                                       self.get_ino(path),
95                                       0,
96                                       2,
97                                       1000,
98                                       1000,
99                                       4096,
100                                       0,
101                                       0,
102                                       0))
103        elif self.is_object(path):
104            value = posix.stat_result((0o755 | stat.S_IFDIR,
105                                       self.get_ino(path),
106                                       0,
107                                       2,
108                                       1000,
109                                       1000,
110                                       4096,
111                                       0,
112                                       0,
113                                       0))
114        elif self.is_property(path):
115            value = posix.stat_result((0o644 | stat.S_IFREG,
116                                       self.get_ino(path),
117                                       0,
118                                       1,
119                                       1000,
120                                       1000,
121                                       4096,
122                                       0,
123                                       0,
124                                       0))
125        else:
126            value = -ENOENT
127        return value
128
129    def readdir(self, path, offset):
130        yield fuse.Direntry('.')
131        yield fuse.Direntry('..')
132        for item in self.qmp.command('qom-list', path=path):
133            yield fuse.Direntry(str(item['name']))
134
135if __name__ == '__main__':
136    import sys, os
137
138    fs = QOMFS(QEMUMonitorProtocol(os.environ['QMP_SOCKET']))
139    fs.main(sys.argv)
140