Add new type __docker_swarm

cdist/conf/type/__docker_swarm/explorer/swarm-state

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+#!/bin/sh -e
+#
+# 2018 Ľubomír Kučera <lubomir.kucera.jr at gmail.com>
+#
+# 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/>.
+#
+
+docker info 2>/dev/null | grep "^Swarm: " | cut -d " " -f 2-

cdist/conf/type/__docker_swarm/gencode-remote

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+#!/bin/sh -e
+#
+# 2018 Ľubomír Kučera <lubomir.kucera.jr at gmail.com>
+#
+# 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")
+swarm_state="$(cat "${__object}/explorer/swarm-state")"
+
+if [ -z "${swarm_state}" ]; then
+    echo "Unable to determine Swarm state. Is compatible version of Docker installed?" >&2
+
+    exit 1
+fi
+
+case "${state}" in
+    absent)
+        if [ "${swarm_state}" = "active" ]; then
+            echo "docker swarm leave --force"
+        fi
+    ;;
+    present)
+        if [ "${swarm_state}" = "inactive" ]; then
+            echo "docker swarm init"
+        fi
+    ;;
+    *)
+        echo "Unsupported state: ${state}" >&2
+
+        exit 1
+    ;;
+esac

cdist/conf/type/__docker_swarm/man.rst

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+cdist-type__docker_swarm(7)
+===========================
+
+NAME
+----
+
+cdist-type__docker_swarm - Manage Swarm
+
+DESCRIPTION
+-----------
+
+This type can initialize Docker swarm mode. For more information about swarm
+mode, see `Swarm mode overview <https://docs.docker.com/engine/swarm/>`_.
+
+OPTIONAL PARAMETERS
+-------------------
+
+state
+    'present' or 'absent', defaults to 'present' where:
+
+    present
+        Swarm is initialized
+    absent
+        Swarm is left
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # Initalizes a swarm
+    __docker_swarm
+
+    # Leaves a swarm
+    __docker_swarm --state absent
+
+
+AUTHORS
+-------
+
+Ľubomír Kučera <lubomir.kucera.jr at gmail.com>
+
+COPYING
+-------
+
+Copyright \(C) 2018 Ľubomír Kučera. 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/__docker_swarm/parameter/default/state

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+present

cdist/conf/type/__docker_swarm/parameter/optional

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+state