mg-unixbench-download: new script for downloading the unixbench archive

The script fetches it, and saves it in c{Images}/benchs.

Default values for the repo URL and actual filename are embedded
in the script itself, and can be overridden as usual (e.g., via
standalone.config).

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
---
Changes from RFCv1:
 * stop using ap-common for default values (for URL and remote
   filename), as requested during review.

diff --git a/mg-unixbench-download b/mg-unixbench-download
new file mode 100755 (executable)
index 0000000..85184c9
--- /dev/null
+++ b/mg-unixbench-download
@@ -0,0 +1,40 @@
+#!/bin/bash
+# This is part of "osstest", an automated testing framework for Xen.
+# Copyright (C) 2009-2014 Citrix Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+
+if [ -f standalone.config ] ; then
+    . standalone.config
+fi
+
+. cri-getconfig
+
+fail () { echo >&2 "$0: $1"; exit 1; }
+
+# By default we try to grab Unixbench 5.1.3
+site=${UNIXBENCH_REPO:-http://byte-unixbench.googlecode.com/files}
+rfile=${UNIXBENCH_FILE:-unixbench-5.1.3.tgz}
+lfile=unixbench.tgz
+
+images=`getconfig Images`;
+dstdir="${images}/benchs"
+mkdir -p $dstdir
+
+wget ${site}/${rfile} -O ${dstdir}/${lfile} || \
+    fail "failed downloading the benchmark"
+
+echo >&2 "downloaded $dstdir/$lfile"