Add __systemd_unit type (#589)

cdist/conf/type/__systemd_unit/explorer/enablement-state

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# 2017 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/>.
+#
+
+systemctl is-enabled "${__object_id}" 2>/dev/null || true

cdist/conf/type/__systemd_unit/explorer/systemctl-present

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# 2017 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/>.
+#
+
+command -v systemctl > /dev/null 2>&1 && echo 0 || echo 1

cdist/conf/type/__systemd_unit/gencode-remote

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+#!/bin/sh -e
+#
+# 2017 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/>.
+#
+
+systemctl_present=$(cat "${__object}/explorer/systemctl-present")
+
+if [ "${systemctl_present}" -ne 0 ]; then
+    echo "systemctl does not seem to be present on this system" >&2
+
+    exit 1
+fi
+
+name="${__object_id}"
+state=$(cat "${__object}/parameter/state")
+current_enablement_state=$(cat "${__object}/explorer/enablement-state")
+
+if [ "${state}" = "absent" ]; then
+    if [ ! -z "${current_enablement_state}" ]; then
+        echo "systemctl --now disable ${name}"
+    fi
+
+    exit 0
+fi
+
+desired_enablement_state=$(cat "${__object}/parameter/enablement-state")
+
+if [ "${current_enablement_state}" = "${desired_enablement_state}" ]; then
+    exit 0
+fi
+
+case "${desired_enablement_state}" in
+    "")
+        # Do nothing
+        :
+    ;;
+    enabled)
+        echo "systemctl enable ${name}"
+    ;;
+    disabled)
+        echo "systemctl disable ${name}"
+    ;;
+    *)
+        echo "Unsupported unit status: ${desired_enablement_state}" >&2
+        exit 1
+    ;;
+esac

cdist/conf/type/__systemd_unit/man.rst

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+cdist-type__systemd_unit(7)
+===========================
+
+NAME
+----
+
+cdist-type__systemd_unit - Install a systemd unit
+
+DESCRIPTION
+-----------
+
+This type can install, enable and start a systemd unit. This is particularly
+useful on systems which take advantage of systemd heavily (e.g., CoreOS). For
+more information about systemd units, see SYSTEMD.UNIT(5).
+
+REQUIRED PARAMETERS
+-------------------
+
+None.
+
+OPTIONAL PARAMETERS
+-------------------
+
+enablement-state
+    'enabled' or 'disabled', where:
+
+    enabled
+        enables the unit
+    disabled
+        disables the unit
+
+source
+    Path to the config file. If source is '-' (dash), take what was written to
+    stdin as the config file content.
+
+state
+    'present' or 'absent', defaults to 'present' where:
+
+    present
+        the unit is installed, enabled and started
+    absent
+        the unit is stopped, disabled and uninstalled
+
+BOOLEAN PARAMETERS
+------------------
+
+restart
+    Restart the unit on change.
+
+MESSAGES
+--------
+
+None.
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # Installs, enables and starts foobar.service
+    __systemd_unit foobar.service \
+        --source "${__manifest}/files/foobar.service" \
+        --enablement-state enabled \
+        --restart
+
+    # Disables the unit
+    __systemd_unit foobar.service --enablement-state disabled
+
+    # Stops, disables and uninstalls foobar.service
+    __systemd_unit foobar.service --state absent
+
+
+AUTHORS
+-------
+
+Ľubomír Kučera <lubomir.kucera.jr at gmail.com>
+
+COPYING
+-------
+
+Copyright \(C) 2017 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/__systemd_unit/manifest

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+#!/bin/sh -e
+#
+# 2017 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/>.
+#
+
+name="${__object_id}"
+source=$(cat "${__object}/parameter/source")
+state=$(cat "${__object}/parameter/state")
+
+onchange() {
+    echo -n "systemctl daemon-reload"
+
+    if [ -f "${__object}/parameter/restart" ]; then
+        echo -n " && (systemctl restart ${name} || true)"
+    fi
+
+    echo
+}
+
+__config_file "/etc/systemd/system/${name}" \
+    --mode 644 \
+    --onchange "$(onchange)" \
+    --source "${source}" \
+    --state "${state}"

cdist/conf/type/__systemd_unit/parameter/boolean

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+restart

cdist/conf/type/__systemd_unit/parameter/default/state

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+present

cdist/conf/type/__systemd_unit/parameter/optional

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+enablement-state
+source
+state