Add initial __prometheus_yoctotemp_exporter type

type/__prometheus_yoctotemp_exporter/files/prometheus-yoctotemp-exporter.service

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+[Unit]
+Description=Prometheus YoctoTemperature exporter
+After=network.target
+
+[Service]
+Type=simple
+# FIXME: ugly workaround with potential side effects.
+ExecStartPre=/usr/bin/chown -R root:dialout /dev/bus/usb/003
+ExecStart=/opt/prometheus-yoctotemp-exporter/venv/bin/python /opt/prometheus-yoctotemp-exporter/prometheus-yoctotemp-exporter
+
+[Install]
+WantedBy=multi-user.target

type/__prometheus_yoctotemp_exporter/gencode-remote

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+#!/bin/sh
+
+VCS_TAG=$(cat "$__object/parameter/version")
+VCS_URL="https://code.recycled.cloud/e-Durable/prometheus-yoctotemp-exporter/raw/tag/$VCS_TAG/prometheus-yoctotemp-exporter"
+
+cat << EOF
+cd /opt/prometheus-yoctotemp-exporter
+
+# Fetch sources.
+curl "$VCS_URL" -o prometheus-yoctotemp-exporter
+
+# Install virtualenv and dependencies.
+virtualenv venv
+. venv/bin/activate
+pip install prometheus_client
+pip install yoctopuce
+
+# Start service
+service prometheus-yoctotemp-exporter start
+EOF

type/__prometheus_yoctotemp_exporter/man.rst

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+cdist-type__prometheus_yoctotemp_exporter(7)
+=====================
+
+NAME
+----
+cdist-type__prometheus_yoctotemp_exporter - Deploy a Prometheus exporter for the YoctoTemperature sensor
+
+
+DESCRIPTION
+-----------
+This (singleton) type deploys a Prometheus exporter for the YoctoTemperature sensor
+
+NOTE
+----
+
+FIXME: this systemd service currently use an ugly hack to deal with
+/dev/bus/usb permissions, with potential side effects. udev should be used
+instead.
+
+REQUIRED PARAMETERS
+-------------------
+version
+  Release tag used to fetch sources from upstream's VCS.
+
+
+OPTIONAL PARAMETERS
+-------------------
+None.
+
+BOOLEAN PARAMETERS
+------------------
+None.
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    __prometheus_yoctotemp_expoter --version v0.1
+
+
+SEE ALSO
+--------
+- `YoctoTemerature sensor <https://www.yoctopuce.com/EN/products/usb-environmental-sensors/yocto-temperature>`_
+- `prometheus-yoctotemp-exporter VCS <https://code.recycled.cloud/e-Durable/prometheus-yoctotemp-exporter>`_
+
+AUTHORS
+-------
+Timothée Floure <t.floure@e-durable.ch>
+
+
+COPYING
+-------
+Copyright \(C) 2020 Timothée Floure. 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/__prometheus_yoctotemp_exporter/manifest

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+#!/bin/sh
+
+os=$(cat "${__global:?}/explorer/os")
+case "$os" in
+	debian|ubuntu)
+		__package python3-virtualenv
+		__package curl
+	;;
+*)
+	echo "$os is not supported by this type. Exiting" >&2
+	exit 1
+	;;
+esac
+
+__directory /opt/prometheus-yoctotemp-exporter
+
+# Make sure the prometheus user exist and belongs to dialout.
+__user prometheus
+require="__user/prometheus" __user_groups prometheus --group dialout
+__systemd_unit prometheus-yoctotemp-exporter.service \
+	--source "$__type/files/prometheus-yoctotemp-exporter.service" \
+	--enablement-state enabled

type/__prometheus_yoctotemp_exporter/parameter/required

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+version