root / lib / utils / nodesetup.py @ d728ac75
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1 | 17b97ab3 | Michael Hanselmann | #
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2 | 17b97ab3 | Michael Hanselmann | #
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3 | 17b97ab3 | Michael Hanselmann | |
4 | 17b97ab3 | Michael Hanselmann | # Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
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5 | 17b97ab3 | Michael Hanselmann | #
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6 | 17b97ab3 | Michael Hanselmann | # This program is free software; you can redistribute it and/or modify
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7 | 17b97ab3 | Michael Hanselmann | # it under the terms of the GNU General Public License as published by
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8 | 17b97ab3 | Michael Hanselmann | # the Free Software Foundation; either version 2 of the License, or
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9 | 17b97ab3 | Michael Hanselmann | # (at your option) any later version.
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10 | 17b97ab3 | Michael Hanselmann | #
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11 | 17b97ab3 | Michael Hanselmann | # This program is distributed in the hope that it will be useful, but
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12 | 17b97ab3 | Michael Hanselmann | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 17b97ab3 | Michael Hanselmann | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 17b97ab3 | Michael Hanselmann | # General Public License for more details.
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15 | 17b97ab3 | Michael Hanselmann | #
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16 | 17b97ab3 | Michael Hanselmann | # You should have received a copy of the GNU General Public License
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17 | 17b97ab3 | Michael Hanselmann | # along with this program; if not, write to the Free Software
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18 | 17b97ab3 | Michael Hanselmann | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | 17b97ab3 | Michael Hanselmann | # 02110-1301, USA.
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20 | 17b97ab3 | Michael Hanselmann | |
21 | 17b97ab3 | Michael Hanselmann | """Utility functions for manipulating /etc/hosts.
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22 | 17b97ab3 | Michael Hanselmann |
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23 | 17b97ab3 | Michael Hanselmann | """
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24 | 17b97ab3 | Michael Hanselmann | |
25 | 24c855a7 | Iustin Pop | from cStringIO import StringIO |
26 | 17b97ab3 | Michael Hanselmann | |
27 | 17b97ab3 | Michael Hanselmann | from ganeti import constants |
28 | 17b97ab3 | Michael Hanselmann | |
29 | 17b97ab3 | Michael Hanselmann | from ganeti.utils import algo |
30 | 17b97ab3 | Michael Hanselmann | from ganeti.utils import io |
31 | 17b97ab3 | Michael Hanselmann | |
32 | 17b97ab3 | Michael Hanselmann | |
33 | 17b97ab3 | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
34 | 17b97ab3 | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
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35 | 17b97ab3 | Michael Hanselmann |
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36 | 17b97ab3 | Michael Hanselmann | @type file_name: str
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37 | 17b97ab3 | Michael Hanselmann | @param file_name: path to the file to modify (usually C{/etc/hosts})
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38 | 17b97ab3 | Michael Hanselmann | @type ip: str
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39 | 17b97ab3 | Michael Hanselmann | @param ip: the IP address
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40 | 17b97ab3 | Michael Hanselmann | @type hostname: str
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41 | 17b97ab3 | Michael Hanselmann | @param hostname: the hostname to be added
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42 | 17b97ab3 | Michael Hanselmann | @type aliases: list
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43 | 17b97ab3 | Michael Hanselmann | @param aliases: the list of aliases to add for the hostname
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44 | 17b97ab3 | Michael Hanselmann |
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45 | 17b97ab3 | Michael Hanselmann | """
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46 | 17b97ab3 | Michael Hanselmann | # Ensure aliases are unique
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47 | 8f9a87c5 | Iustin Pop | names = algo.UniqueSequence([hostname] + aliases) |
48 | 17b97ab3 | Michael Hanselmann | |
49 | 24c855a7 | Iustin Pop | out = StringIO() |
50 | 8f9a87c5 | Iustin Pop | |
51 | 8f9a87c5 | Iustin Pop | def _write_entry(written): |
52 | 8f9a87c5 | Iustin Pop | if not written: |
53 | 8f9a87c5 | Iustin Pop | out.write("%s\t%s\n" % (ip, " ".join(names))) |
54 | 8f9a87c5 | Iustin Pop | return True |
55 | 8f9a87c5 | Iustin Pop | |
56 | 8f9a87c5 | Iustin Pop | written = False
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57 | 24c855a7 | Iustin Pop | for line in io.ReadFile(file_name).splitlines(True): |
58 | 24c855a7 | Iustin Pop | fields = line.split() |
59 | 24c855a7 | Iustin Pop | if fields and not fields[0].startswith("#") and ip == fields[0]: |
60 | 8f9a87c5 | Iustin Pop | written = _write_entry(written) |
61 | 8f9a87c5 | Iustin Pop | else:
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62 | 8f9a87c5 | Iustin Pop | out.write(line) |
63 | 8f9a87c5 | Iustin Pop | _write_entry(written) |
64 | 17b97ab3 | Michael Hanselmann | |
65 | 24c855a7 | Iustin Pop | io.WriteFile(file_name, data=out.getvalue(), mode=0644)
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66 | 17b97ab3 | Michael Hanselmann | |
67 | 17b97ab3 | Michael Hanselmann | |
68 | 17b97ab3 | Michael Hanselmann | def AddHostToEtcHosts(hostname, ip): |
69 | 17b97ab3 | Michael Hanselmann | """Wrapper around SetEtcHostsEntry.
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70 | 17b97ab3 | Michael Hanselmann |
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71 | 17b97ab3 | Michael Hanselmann | @type hostname: str
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72 | 17b97ab3 | Michael Hanselmann | @param hostname: a hostname that will be resolved and added to
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73 | 17b97ab3 | Michael Hanselmann | L{constants.ETC_HOSTS}
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74 | 17b97ab3 | Michael Hanselmann | @type ip: str
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75 | 17b97ab3 | Michael Hanselmann | @param ip: The ip address of the host
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76 | 17b97ab3 | Michael Hanselmann |
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77 | 17b97ab3 | Michael Hanselmann | """
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78 | 17b97ab3 | Michael Hanselmann | SetEtcHostsEntry(constants.ETC_HOSTS, ip, hostname, [hostname.split(".")[0]]) |
79 | 17b97ab3 | Michael Hanselmann | |
80 | 17b97ab3 | Michael Hanselmann | |
81 | 17b97ab3 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
82 | 17b97ab3 | Michael Hanselmann | """Removes a hostname from /etc/hosts.
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83 | 17b97ab3 | Michael Hanselmann |
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84 | 17b97ab3 | Michael Hanselmann | IP addresses without names are removed from the file.
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85 | 17b97ab3 | Michael Hanselmann |
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86 | 17b97ab3 | Michael Hanselmann | @type file_name: str
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87 | 17b97ab3 | Michael Hanselmann | @param file_name: path to the file to modify (usually C{/etc/hosts})
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88 | 17b97ab3 | Michael Hanselmann | @type hostname: str
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89 | 17b97ab3 | Michael Hanselmann | @param hostname: the hostname to be removed
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90 | 17b97ab3 | Michael Hanselmann |
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91 | 17b97ab3 | Michael Hanselmann | """
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92 | 24c855a7 | Iustin Pop | out = StringIO() |
93 | 24c855a7 | Iustin Pop | |
94 | 24c855a7 | Iustin Pop | for line in io.ReadFile(file_name).splitlines(True): |
95 | 24c855a7 | Iustin Pop | fields = line.split() |
96 | 24c855a7 | Iustin Pop | if len(fields) > 1 and not fields[0].startswith("#"): |
97 | 24c855a7 | Iustin Pop | names = fields[1:]
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98 | 24c855a7 | Iustin Pop | if hostname in names: |
99 | 24c855a7 | Iustin Pop | while hostname in names: |
100 | 24c855a7 | Iustin Pop | names.remove(hostname) |
101 | 24c855a7 | Iustin Pop | if names:
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102 | 24c855a7 | Iustin Pop | out.write("%s %s\n" % (fields[0], " ".join(names))) |
103 | 24c855a7 | Iustin Pop | continue
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104 | 24c855a7 | Iustin Pop | |
105 | 24c855a7 | Iustin Pop | out.write(line) |
106 | 24c855a7 | Iustin Pop | |
107 | 24c855a7 | Iustin Pop | io.WriteFile(file_name, data=out.getvalue(), mode=0644)
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108 | 17b97ab3 | Michael Hanselmann | |
109 | 17b97ab3 | Michael Hanselmann | |
110 | 17b97ab3 | Michael Hanselmann | def RemoveHostFromEtcHosts(hostname): |
111 | 17b97ab3 | Michael Hanselmann | """Wrapper around RemoveEtcHostsEntry.
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112 | 17b97ab3 | Michael Hanselmann |
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113 | 17b97ab3 | Michael Hanselmann | @type hostname: str
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114 | 17b97ab3 | Michael Hanselmann | @param hostname: hostname that will be resolved and its
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115 | 17b97ab3 | Michael Hanselmann | full and shot name will be removed from
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116 | 17b97ab3 | Michael Hanselmann | L{constants.ETC_HOSTS}
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117 | 17b97ab3 | Michael Hanselmann |
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118 | 17b97ab3 | Michael Hanselmann | """
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119 | 17b97ab3 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hostname) |
120 | 17b97ab3 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hostname.split(".")[0]) |