From 88ec06d06fdd2cf0907e8f36614d20f970279ace Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <KAction@gnu.org>
Date: Fri, 22 Jul 2016 09:55:44 +0300
Subject: [PATCH] new type: __hosts
This type adds or removes entries from /etc/hosts,
ensuring that same hostname can never resolve to
several different ip addresses.
Signed-off-by: Dmitry Bogatov <KAction@gnu.org>
---
cdist/conf/type/__hosts/man.rst | 55 +++++++++++++++++++
cdist/conf/type/__hosts/manifest | 49 +++++++++++++++++
.../conf/type/__hosts/parameter/default/state | 1 +
cdist/conf/type/__hosts/parameter/optional | 2 +
4 files changed, 107 insertions(+)
create mode 100644 cdist/conf/type/__hosts/man.rst
create mode 100755 cdist/conf/type/__hosts/manifest
create mode 100644 cdist/conf/type/__hosts/parameter/default/state
create mode 100644 cdist/conf/type/__hosts/parameter/optional
diff --git a/cdist/conf/type/__hosts/man.rst b/cdist/conf/type/__hosts/man.rst
new file mode 100644
index 00000000..f89a619c
--- /dev/null
+++ b/cdist/conf/type/__hosts/man.rst
@@ -0,0 +1,55 @@
+cdist-type__hosts(7)
+====================
+
+NAME
+----
+
+cdist-type__hosts - manage entries in /etc/hosts
+
+DESCRIPTION
+-----------
+
+Add or remove entries from */etc/hosts* file.
+
+OPTIONAL PARAMETERS
+-------------------
+
+state
+
+ If state is ``present``, make *object_id* resolve to *ip*. If
+ state is ``absent``, *object_id* will no longer resolve to
+ anything via */etc/hosts*.
+
+ip
+
+ IP address, to which hostname (=\ *object_id*) must resolve. If
+ state is ``present``, this parameter is mandatory, if state is
+ ``absent``, this parameter is silently ignored.
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+ # Now `funny' resolves to 192.168.1.76,
+ __hosts funny --ip 192.168.1.76
+ # and `happy' does not resolve (at least via /etc/hosts)
+ __hosts happy --state absent
+
+SEE ALSO
+--------
+
+:strong:`hosts`\ (5)
+
+AUTHORS
+-------
+
+Dmitry Bogatov <KAction@gnu.org>
+
+
+COPYING
+-------
+
+Copyright (C) 2015,2016 Dmitry Bogatov. Free use of this software is granted
+under the terms of the GNU General Public License version 3 or later
+(GPLv3+).
diff --git a/cdist/conf/type/__hosts/manifest b/cdist/conf/type/__hosts/manifest
new file mode 100755
index 00000000..99a06c09
--- /dev/null
+++ b/cdist/conf/type/__hosts/manifest
@@ -0,0 +1,49 @@
+#!/bin/sh
+# Copyright (C) 2015 Bogatov Dmitry <KAction@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+hostname="$__object_id"
+state="$(cat "$__object/parameter/state")"
+
+# First remove all lines for given hostname and then insert again.
+# Otherwise, we risk having multiple entries for same hostname.
+#
+# There is a corner case, which we do not handle. Namely, /etc/hosts
+# format allows several host names on single line, like following:
+#
+# 192.168.15.16 foo bar
+#
+# If this type manages hostname `foo', then hostname bar will get erased.
+
+__line "__hosts/delete/${hostname}" \
+ --state absent \
+ --regex " ${hostname}[ ]*$" \
+ --file /etc/hosts
+export require="__line/__hosts/delete/${hostname}"
+
+case "$state" in
+ absent)
+ : # Nothing to do
+ ;;
+ present)
+ ip="$(cat "$__object/parameter/ip")"
+ __line "__hosts/insert/${hostname}" \
+ --line "${ip} ${hostname}" \
+ --file /etc/hosts
+ ;;
+ *)
+ echo "ERROR: type (${__type##*/}) does not support state \`$state'"
+ exit 1
+esac
diff --git a/cdist/conf/type/__hosts/parameter/default/state b/cdist/conf/type/__hosts/parameter/default/state
new file mode 100644
index 00000000..e7f6134f
--- /dev/null
+++ b/cdist/conf/type/__hosts/parameter/default/state
@@ -0,0 +1 @@
+present
diff --git a/cdist/conf/type/__hosts/parameter/optional b/cdist/conf/type/__hosts/parameter/optional
new file mode 100644
index 00000000..411fc5d2
--- /dev/null
+++ b/cdist/conf/type/__hosts/parameter/optional
@@ -0,0 +1,2 @@
+state
+ip