125 lines
3.7 KiB
Python
125 lines
3.7 KiB
Python
#!/usr/bin/env python3
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#
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# Render Qemu Block Graph
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#
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# Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import sys
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import subprocess
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import json
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from graphviz import Digraph
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sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'python'))
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from qemu.qmp import (
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QEMUMonitorProtocol,
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QMPResponseError,
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)
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def perm(arr):
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s = 'w' if 'write' in arr else '_'
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s += 'r' if 'consistent-read' in arr else '_'
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s += 'u' if 'write-unchanged' in arr else '_'
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s += 'g' if 'graph-mod' in arr else '_'
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s += 's' if 'resize' in arr else '_'
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return s
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def render_block_graph(qmp, filename, format='png'):
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'''
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Render graph in text (dot) representation into "@filename" and
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representation in @format into "@filename.@format"
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'''
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bds_nodes = qmp.command('query-named-block-nodes')
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bds_nodes = {n['node-name']: n for n in bds_nodes}
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job_nodes = qmp.command('query-block-jobs')
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job_nodes = {n['device']: n for n in job_nodes}
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block_graph = qmp.command('x-debug-query-block-graph')
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graph = Digraph(comment='Block Nodes Graph')
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graph.format = format
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graph.node('permission symbols:\l'
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' w - Write\l'
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' r - consistent-Read\l'
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' u - write - Unchanged\l'
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' g - Graph-mod\l'
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' s - reSize\l'
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'edge label scheme:\l'
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' <child type>\l'
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' <perm>\l'
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' <shared_perm>\l', shape='none')
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for n in block_graph['nodes']:
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if n['type'] == 'block-driver':
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info = bds_nodes[n['name']]
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label = n['name'] + ' [' + info['drv'] + ']'
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if info['drv'] == 'file':
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label += '\n' + os.path.basename(info['file'])
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shape = 'ellipse'
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elif n['type'] == 'block-job':
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info = job_nodes[n['name']]
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label = info['type'] + ' job (' + n['name'] + ')'
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shape = 'box'
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else:
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assert n['type'] == 'block-backend'
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label = n['name'] if n['name'] else 'unnamed blk'
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shape = 'box'
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graph.node(str(n['id']), label, shape=shape)
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for e in block_graph['edges']:
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label = '%s\l%s\l%s\l' % (e['name'], perm(e['perm']),
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perm(e['shared-perm']))
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graph.edge(str(e['parent']), str(e['child']), label=label)
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graph.render(filename)
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class LibvirtGuest():
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def __init__(self, name):
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self.name = name
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def command(self, cmd):
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# only supports qmp commands without parameters
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m = {'execute': cmd}
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ar = ['virsh', 'qemu-monitor-command', self.name, json.dumps(m)]
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reply = json.loads(subprocess.check_output(ar))
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if 'error' in reply:
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raise QMPResponseError(reply)
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return reply['return']
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if __name__ == '__main__':
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obj = sys.argv[1]
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out = sys.argv[2]
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if os.path.exists(obj):
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# assume unix socket
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qmp = QEMUMonitorProtocol(obj)
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qmp.connect()
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else:
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# assume libvirt guest name
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qmp = LibvirtGuest(obj)
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render_block_graph(qmp, out)
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