93 lines
3.2 KiB
Python
93 lines
3.2 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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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 version 3, as
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# published by the Free Software Foundation.
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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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from StringIO import StringIO
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from cloudinit.distros.parsers import chop_comment
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# See: man hosts
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# or http://unixhelp.ed.ac.uk/CGI/man-cgi?hosts
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# or http://tinyurl.com/6lmox3
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class HostsConf(object):
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def __init__(self, text):
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self._text = text
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self._contents = None
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def parse(self):
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if self._contents is None:
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self._contents = self._parse(self._text)
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def get_entry(self, ip):
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self.parse()
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options = []
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for (line_type, components) in self._contents:
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if line_type == 'option':
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(pieces, _tail) = components
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if len(pieces) and pieces[0] == ip:
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options.append(pieces[1:])
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return options
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def del_entries(self, ip):
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self.parse()
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n_entries = []
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for (line_type, components) in self._contents:
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if line_type != 'option':
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n_entries.append((line_type, components))
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continue
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else:
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(pieces, _tail) = components
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if len(pieces) and pieces[0] == ip:
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pass
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elif len(pieces):
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n_entries.append((line_type, list(components)))
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self._contents = n_entries
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def add_entry(self, ip, canonical_hostname, *aliases):
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self.parse()
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self._contents.append(('option',
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([ip, canonical_hostname] + list(aliases), '')))
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def _parse(self, contents):
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entries = []
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for line in contents.splitlines():
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if not len(line.strip()):
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entries.append(('blank', [line]))
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continue
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(head, tail) = chop_comment(line.strip(), '#')
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if not len(head):
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entries.append(('all_comment', [line]))
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continue
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entries.append(('option', [head.split(None), tail]))
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return entries
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def __str__(self):
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self.parse()
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contents = StringIO()
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for (line_type, components) in self._contents:
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if line_type == 'blank':
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contents.write("%s\n" % (components[0]))
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elif line_type == 'all_comment':
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contents.write("%s\n" % (components[0]))
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elif line_type == 'option':
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(pieces, tail) = components
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pieces = [str(p) for p in pieces]
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pieces = "\t".join(pieces)
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contents.write("%s%s\n" % (pieces, tail))
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return contents.getvalue()
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