Rm due to new patch from Dmitry.
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cdist-type__hosts(7)
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====================
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NAME
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----
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cdist-type__hosts - manage entries in /etc/hosts
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DESCRIPTION
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-----------
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Add or remove entries from */etc/hosts* file.
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OPTIONAL PARAMETERS
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-------------------
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state
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    If state is ``present``, make *object_id* resolve to *ip*. If
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    state is ``absent``, *object_id* will no longer resolve to
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    anything via */etc/hosts*.
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ip
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    IP address, to which hostname (=\ *object_id*) must resolve. If
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    state is ``present``, this parameter is mandatory, if state is
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    ``absent``, this parameter is silently ignored.
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EXAMPLES
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--------
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.. code-block:: sh
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    # Now `funny' resolves to 192.168.1.76,
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    __hosts funny --ip 192.168.1.76
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    # and `happy' does not resolve (at least via /etc/hosts)
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    __hosts happy --state absent
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SEE ALSO
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--------
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:strong:`hosts`\ (5)
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AUTHORS
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-------
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Dmitry Bogatov <KAction@gnu.org>
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COPYING
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-------
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Copyright (C) 2015,2016 Dmitry Bogatov. Free use of this software is granted
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under the terms of the GNU General Public License version 3 or later
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(GPLv3+).
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#!/bin/sh
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# Copyright (C) 2015  Bogatov Dmitry <KAction@gnu.org>
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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 3 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, see <http://www.gnu.org/licenses/>.
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hostname="$__object_id"
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state="$(cat "$__object/parameter/state")"
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# First remove all lines for given hostname and then insert again.
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# Otherwise, we risk having multiple entries for same hostname.
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#
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# There is a corner case, which we do not handle. Namely, /etc/hosts
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# format allows several host names on single line, like following:
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#
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#     192.168.15.16 foo bar
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#
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# If this type manages hostname `foo', then hostname bar will get erased.
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__line "__hosts/delete/${hostname}" \
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       --state absent               \
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       --regex " ${hostname}[ ]*$"  \
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       --file /etc/hosts
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export require="__line/__hosts/delete/${hostname}"
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case "$state" in
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    absent)
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        : # Nothing to do
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        ;;
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    present)
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        ip="$(cat "$__object/parameter/ip")"
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        __line "__hosts/insert/${hostname}" \
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               --line "${ip} ${hostname}"   \
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               --file /etc/hosts
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        ;;
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    *)
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        echo "ERROR: type (${__type##*/}) does not support state \`$state'"
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        exit 1
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esac
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present
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state
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ip
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