add script to update the chroot environments

scripts/update-linux.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# Copyright 2014 wkhtmltopdf authors
+#
+# This file is part of wkhtmltopdf.
+#
+# wkhtmltopdf is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# wkhtmltopdf 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 Lesser General Public License
+# along with wkhtmltopdf.  If not, see <http:#www.gnu.org/licenses/>.
+
+if [ "$(id -u)" != "0" ]; then
+   echo "This script must be run as root" 1>&2
+   exit 1
+fi
+
+# update the host machine
+apt-get update
+apt-get dist-upgrade --assume-yes
+
+# update the wheezy chroots
+schroot -c wkhtmltopdf-wheezy-amd64 -- apt-get update
+schroot -c wkhtmltopdf-wheezy-amd64 -- apt-get dist-upgrade --assume-yes
+schroot -c wkhtmltopdf-wheezy-i386  -- apt-get update
+schroot -c wkhtmltopdf-wheezy-i386  -- apt-get dist-upgrade --assume-yes
+
+# update the centos 5 chroots
+schroot -c wkhtmltopdf-centos5-amd64 -- yum update -y
+schroot -c wkhtmltopdf-centos5-i386  -- yum update -y