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-rwxr-xr-xtools/motd-hook35
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diff --git a/tools/motd-hook b/tools/motd-hook
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+#!/bin/sh
+#
+# 92-ec2-upgrade-available - update-motd script
+#
+# Copyright (C) 2010 Canonical Ltd.
+#
+# Authors: Scott Moser <smoser@ubuntu.com>
+#
+# This program 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, version 3 of the License.
+#
+# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+# Determining if updates are available is possibly slow.
+# a cronjob runs occasioinally and updates a file with information
+# on the latest available release (if newer than current)
+
+BUILD_FILE=/var/lib/cloud/data/available.build
+
+[ -s "${BUILD_FILE}" ] || exit 0
+
+read suite build_name name serial < "${BUILD_FILE}"
+
+cat <<EOF
+A newer build of the Ubuntu ${suite} ${build_name} image is available.
+It is named '${name}' and has build serial '${serial}'.
+EOF