Add __networktime type.

type/__networktime/man.rst

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+cdist-type__networktime(7)
+==========================
+
+NAME
+----
+cdist-type__networktime - Generic time synchronization type
+
+
+DESCRIPTION
+-----------
+
+This type is intended to be a simple abstraction over the various backends and
+programs available for network time synchronization. This type only takes a
+list of peers to synchronize to as argument, and then chooses an appropriate
+backend depending on the operating system, configures, starts and enables it to
+start on boot.
+
+Currently, the following OSes are supported with the following backends:
+
+- Alpine Linux: builtin busybox NTPd
+- Debian/Ubuntu: systemd-timesyncd
+
+
+REQUIRED MULTIPLE PARAMETERS
+-------------------
+peer:
+    The name or IP address of a peer to synchronize to.
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    # 2.XXX.ntp.org are IPv6-enabled pools
+    __networktime --peer 2.ch.pool.ntp.org \
+        --peer 2.europe.pool.ntp.org
+
+
+AUTHORS
+-------
+Joachim Desroches <joachim.desroches@epfl.ch>
+
+
+COPYING
+-------
+Copyright \(C) 2021 Joachim Desroches. 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.

type/__networktime/manifest

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+#!/bin/sh -e
+#
+# 2021 Joachim Desroches (joachim.desroches@epfl.ch)
+#
+# 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/>.
+#
+
+os=$(cat "${__global:?}/explorer/os")
+
+case "$os" in
+'alpine')
+	backend=busybox-openrc
+	;;
+'debian' | 'ubuntu')
+	backend=systemd-timesyncd
+	;;
+*)
+	printf "__networktime is not yet implemented for %s.\n" "$os" >&2
+	printf "Please contribute an implementation for it if you can.\n" >&2
+	exit 1
+	;;
+esac
+
+case "$backend" in
+'busybox-openrc')
+	argstring="-N"
+	while read -r peer;
+	do
+		argstring="$argstring -p $peer"
+	done < "${__object:?}/parameter/peer"
+
+	__start_on_boot ntpd
+
+	__file /etc/conf.d/ntpd \
+		--mode 0644 --onchange "service ntpd restart"\
+		--source - <<- EOF
+		# NTPd OpenRC configuration file. Managed by cdist.
+		NTPD_OPTS="$argstring"
+		EOF
+	;;
+
+'systemd-timesyncd')
+	peers="$(tr '\n' ' ' < "${__object:?}/parameter/peer")"
+
+	__package ntp --state absent
+	require="__package/ntp" __systemd_unit systemd-timesyncd \
+		--enablement-state enabled --restart
+
+	__file /etc/systemd/timesyncd.conf \
+		--mode 0644 --onchange "systemctl restart systemd-timesyncd" \
+		--source - <<- EOF
+		# timesyncd(8) configuration file. Managed by cdist.
+		[Time]
+		NTP=$peers
+		EOF
+	;;
+*)
+	printf "Unkown backend in __networktime. This is a bug.\n" >&2
+	exit 1
+	;;
+esac

type/__networktime/parameter/required_multiple

@@ -0,0 +1 @@
+peer