mirror of
https://github.com/virt-manager/virt-manager.git
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135 lines
3.4 KiB
Python
135 lines
3.4 KiB
Python
#
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# Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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# Use is subject to license terms.
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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, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301 USA.
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#
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import os
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_parsers = []
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class parser(object):
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"""
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Base class for particular config file format definitions of
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a VM instance.
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Warning: this interface is not (yet) considered stable and may
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change at will.
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"""
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@staticmethod
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def identify_file(input_file):
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"""
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Return True if the given file is of this format.
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"""
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raise NotImplementedError
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@staticmethod
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def import_file(input_file):
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"""
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Import a configuration file. Raises if the file couldn't be
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opened, or parsing otherwise failed.
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"""
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raise NotImplementedError
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@staticmethod
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def export(vm):
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"""
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Export a configuration file as a string.
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@vm vm configuration instance
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Raises ValueError if configuration is not suitable.
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"""
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raise NotImplementedError
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def register_parser(new_parser):
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"""
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Register a particular config format parser. This should be called by each
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config plugin on import.
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"""
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global _parsers
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_parsers += [new_parser]
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def parser_by_name(name):
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"""
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Return the parser of the given name.
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"""
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parsers = [p for p in _parsers if p.name == name]
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if len(parsers):
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return parsers[0]
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def find_parser_by_file(input_file):
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"""
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Return the parser that is capable of comprehending the given file.
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"""
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for p in _parsers:
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if p.identify_file(input_file):
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return p
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return None
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def formats():
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"""
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Return a list of supported formats.
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"""
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return [p.name for p in _parsers]
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def input_formats():
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"""
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Return a list of supported input formats.
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"""
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return [p.name for p in _parsers if p.can_import]
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def output_formats():
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"""
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Return a list of supported output formats.
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"""
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return [p.name for p in _parsers if p.can_export]
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def find_input(path, fmt=None):
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"""
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Search for a configuration file automatically. If @format is given,
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then only search using a matching format parser.
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"""
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if os.path.isdir(path):
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files = os.listdir(path)
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for p in _parsers:
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if not p.can_identify:
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continue
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if fmt and fmt != p.name:
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continue
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if os.path.isfile(path):
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if p.identify_file(path):
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return (path, p.name)
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elif os.path.isdir(path):
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for cfgfile in [x for x in files if x.endswith(p.suffix)]:
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if p.identify_file(os.path.join(path, cfgfile)):
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return (os.path.join(path, cfgfile), p.name)
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raise StandardError(_("Unknown format"))
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