Add __apt_default_release type (#643)

cdist/conf/type/__apt_default_release/man.rst

@@ -0,0 +1,46 @@
+cdist-type__apt_default_release(7)
+==================================
+
+NAME
+----
+cdist-type__apt_default_release - Configure the default release for apt
+
+
+DESCRIPTION
+-----------
+Configure the default release for apt, using the APT::Default-Release
+configuration value.
+
+REQUIRED PARAMETERS
+-------------------
+release
+   The value to set APT::Default-Release to.
+
+   This can contain release name, codename or release version. Examples:
+   'stable', 'testing', 'unstable', 'stretch', 'buster', '4.0', '5.0*'.
+
+
+OPTIONAL PARAMETERS
+-------------------
+None.
+
+
+EXAMPLES
+--------
+
+.. code-block:: sh
+
+    __apt_default_release --release stretch
+
+
+AUTHORS
+-------
+Matthijs Kooijman <matthijs--@--stdin.nl>
+
+
+COPYING
+-------
+Copyright \(C) 2017 Matthijs Kooijman. 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/__apt_default_release/manifest

@@ -0,0 +1,41 @@
+#!/bin/sh -e
+#
+# 2014 Steven Armstrong (steven-cdist at armstrong.cc)
+# 2017 Matthijs Kooijman (matthijs at stdin.nl)
+#
+# 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")
+release="$(cat "$__object/parameter/release")"
+
+case "$os" in
+   ubuntu|debian|devuan)
+      __file /etc/apt/apt.conf.d/99-default-release \
+         --owner root --group root --mode 644 \
+         --source - << DONE
+APT::Default-Release "$release";
+DONE
+   ;;
+   *)
+      cat >&2 << DONE
+The developer of this type (${__type##*/}) did not think your operating system
+($os) would have any use for it. If you think otherwise please submit a patch.
+DONE
+      exit 1
+   ;;
+esac

cdist/conf/type/__apt_default_release/parameter/required

@@ -0,0 +1 @@
+release