← Back to branch summary

~cloud-init-dev/cloud-init/trunk

« back to all changes in this revision

Viewing changes to cloudinit/distros/parsers/hosts.py

  • Committer: Scott Moser
  • Date: 2016-08-10 15:06:15 UTC
  • Revision ID: smoser@ubuntu.com-20160810150615-ma2fv107w3suy1ma
README: Mention move of revision control to git.

cloud-init development has moved its revision control to git.
It is available at 
  https://code.launchpad.net/cloud-init

Clone with 
  git clone https://git.launchpad.net/cloud-init
or
  git clone git+ssh://git.launchpad.net/cloud-init

For more information see
  https://git.launchpad.net/cloud-init/tree/HACKING.rst

Show diffs side-by-side

added added

removed removed

Lines of Context:
cloudinit/distros/parsers/hosts.py
1
 
# vi: ts=4 expandtab
2
 
#
3
 
#    Copyright (C) 2012 Yahoo! Inc.
4
 
#
5
 
#    Author: Joshua Harlow <harlowja@yahoo-inc.com>
6
 
#
7
 
#    This program is free software: you can redistribute it and/or modify
8
 
#    it under the terms of the GNU General Public License version 3, as
9
 
#    published by the Free Software Foundation.
10
 
#
11
 
#    This program is distributed in the hope that it will be useful,
12
 
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
 
#    GNU General Public License for more details.
15
 
#
16
 
#    You should have received a copy of the GNU General Public License
17
 
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
18
 
 
19
 
from six import StringIO
20
 
 
21
 
from cloudinit.distros.parsers import chop_comment
22
 
 
23
 
 
24
 
# See: man hosts
25
 
# or http://unixhelp.ed.ac.uk/CGI/man-cgi?hosts
26
 
# or http://tinyurl.com/6lmox3
27
 
class HostsConf(object):
28
 
    def __init__(self, text):
29
 
        self._text = text
30
 
        self._contents = None
31
 
 
32
 
    def parse(self):
33
 
        if self._contents is None:
34
 
            self._contents = self._parse(self._text)
35
 
 
36
 
    def get_entry(self, ip):
37
 
        self.parse()
38
 
        options = []
39
 
        for (line_type, components) in self._contents:
40
 
            if line_type == 'option':
41
 
                (pieces, _tail) = components
42
 
                if len(pieces) and pieces[0] == ip:
43
 
                    options.append(pieces[1:])
44
 
        return options
45
 
 
46
 
    def del_entries(self, ip):
47
 
        self.parse()
48
 
        n_entries = []
49
 
        for (line_type, components) in self._contents:
50
 
            if line_type != 'option':
51
 
                n_entries.append((line_type, components))
52
 
                continue
53
 
            else:
54
 
                (pieces, _tail) = components
55
 
                if len(pieces) and pieces[0] == ip:
56
 
                    pass
57
 
                elif len(pieces):
58
 
                    n_entries.append((line_type, list(components)))
59
 
        self._contents = n_entries
60
 
 
61
 
    def add_entry(self, ip, canonical_hostname, *aliases):
62
 
        self.parse()
63
 
        self._contents.append(('option',
64
 
                              ([ip, canonical_hostname] + list(aliases), '')))
65
 
 
66
 
    def _parse(self, contents):
67
 
        entries = []
68
 
        for line in contents.splitlines():
69
 
            if not len(line.strip()):
70
 
                entries.append(('blank', [line]))
71
 
                continue
72
 
            (head, tail) = chop_comment(line.strip(), '#')
73
 
            if not len(head):
74
 
                entries.append(('all_comment', [line]))
75
 
                continue
76
 
            entries.append(('option', [head.split(None), tail]))
77
 
        return entries
78
 
 
79
 
    def __str__(self):
80
 
        self.parse()
81
 
        contents = StringIO()
82
 
        for (line_type, components) in self._contents:
83
 
            if line_type == 'blank':
84
 
                contents.write("%s\n" % (components[0]))
85
 
            elif line_type == 'all_comment':
86
 
                contents.write("%s\n" % (components[0]))
87
 
            elif line_type == 'option':
88
 
                (pieces, tail) = components
89
 
                pieces = [str(p) for p in pieces]
90
 
                pieces = "\t".join(pieces)
91
 
                contents.write("%s%s\n" % (pieces, tail))
92
 
        return contents.getvalue()