add new type __xymon_server

This type installs a Xymon monitoring-server. See https://xymon.com/ for
a demo and further information.

cdist/conf/type/__xymon_server/gencode-remote

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+#!/bin/sh -e
+#
+# 2018-2019 Thomas Eckert (tom at it-eckert.de)
+#
+# This file is part of cdist.
+#
+# cdist 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.
+#
+# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
+
+## "move" user-modified dirs to /etc/xymon to be managed by __xymon_config:
+if [ ! -L /usr/lib/xymon/server/ext ]; then
+	echo "mv /usr/lib/xymon/server/ext /etc/xymon"
+	echo "ln -s /etc/xymon/ext /usr/lib/xymon/server/"
+	echo "ext-dir moved and symlinked" >> "$__messages_out"
+fi	

cdist/conf/type/__xymon_server/man.rst

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+cdist-type__xymon_server(7)
+===========================
+
+NAME
+----
+cdist-type__xymon_server - Install a Xymon server
+
+
+DESCRIPTION
+-----------
+This cdist type installs a Xymon (https://www.xymon.com/) server and (optional)
+required helper packages.
+
+This includes the Xymon client as a dependency, so NO NEED to install
+`__xymon_client` separately.
+
+To access the webinterface a webserver is required.  The cdist-type
+`__xymon_apache` can be used to install and configure the apache webserver for
+the use with Xymon.
+
+Further and day-to-day configuration of Xymon can either be done manually in
+`/etc/xymon/` or the directory can be deployed and managed by `__xymon_config`.
+
+
+REQUIRED PARAMETERS
+-------------------
+None.
+
+
+OPTIONAL PARAMETERS
+-------------------
+state
+    'present', 'absent', defaults to 'present'. If '--install_helpers' is
+    specified for 'absent' the helper packages will be un-installed.
+
+
+BOOLEAN PARAMETERS
+------------------
+install_helpers
+    Install helper packages used by Xymon (fping, heirloom-mailx, traceroute,
+    ntpdate).
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # minmal
+    __xymon_server
+
+    # the same
+    __xymon_server --state present
+
+    # also install helper packages:
+    __xymon_server --install_helpers
+
+    # examples to give a more complete picture: __xymon_server installed on
+    # `xymon.example.com` w/ IP 192.168.1.1:
+    #
+    # install webserver and grant 2 private subnets access to the webinterface:
+    __xymon_apache --ipacl "192.168.0.0/16 10.0.0.0/8"
+    # deploy server-configuration with __xymon_config:
+    __xymon_config --confdir=xymon.example.com
+
+    # install xymon-client on other machines (not needed on the server):
+    __xymon_client --servers "192.168.1.1"
+
+
+
+SEE ALSO
+--------
+:strong:`cdist__xymon_apache`\ (7), :strong:`cdist__xymon_config`\ (7),
+:strong:`cdist__xymon_client`\ (7), :strong:`xymon`\ (7)
+
+
+AUTHORS
+-------
+Thomas Eckert <tom--@--it-eckert.de>
+
+
+COPYING
+-------
+Copyright \(C) 2018-2019 Thomas Eckert. 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.

cdist/conf/type/__xymon_server/manifest

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+#!/bin/sh -e
+#
+# 2018-2019 Thomas Eckert (tom at it-eckert.de)
+#
+# This file is part of cdist.
+#
+# cdist 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.
+#
+# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
+
+state=$(cat "$__object/parameter/state")
+if [ -f "$__object/parameter/install_helpers" ]; then
+	install_helpers=1
+else
+	install_helpers=0
+fi
+
+os=$(cat "$__global/explorer/os")
+case "$os" in
+	debian|ubuntu)
+		:
+	;;
+	*)
+		echo "Your operating system ($os) is currently not supported by this type (${__type##*/})." >&2
+		echo "Please contribute an implementation for it if you can." >&2
+		exit 1
+	;;
+esac
+
+__package xymon --state "$state"
+
+## install helper-packages/tools used by the xymon server if requested:
+if [ "$install_helpers" = "1" ]; then
+	__package fping --state "$state"
+	__package heirloom-mailx --state "$state"
+	__package traceroute --state "$state"
+	__package ntpdate --state "$state"
+fi
+
+## CLI-usage often requires a shell:
+require="__package/xymon" __user xymon --shell "/bin/bash" --state "$state"

cdist/conf/type/__xymon_server/parameter/boolean

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+install_helpers

cdist/conf/type/__xymon_server/parameter/default/state

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+present

cdist/conf/type/__xymon_server/parameter/optional

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+state