82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
# 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 file is part of cloud-init. See LICENSE file for license information.
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from io 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 https://linux.die.net/man/5/hosts
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# or https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-configfiles.html # noqa
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class HostsConf:
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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(
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("option", ([ip, canonical_hostname] + list(aliases), ""))
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)
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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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