Add DownloadURL.sh provisioning helper script

Change-Id: I64bef8470555e33772b72847aa76e0e9b4720696
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>

coin/provisioning/common/DownloadURL.sh

@@ -0,0 +1,85 @@
+#!/bin/bash
+
+#############################################################################
+##
+## Copyright (C) 2017 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the test suite of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:LGPL21$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see http://www.qt.io/terms-conditions. For further
+## information use the contact form at http://www.qt.io/contact-us.
+##
+## GNU Lesser General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU Lesser
+## General Public License version 2.1 or version 3 as published by the Free
+## Software Foundation and appearing in the file LICENSE.LGPLv21 and
+## LICENSE.LGPLv3 included in the packaging of this file. Please review the
+## following information to ensure the GNU Lesser General Public License
+## requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+## http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+##
+## As a special exception, The Qt Company gives you certain additional
+## rights. These rights are described in The Qt Company LGPL Exception
+## version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+# A helper script used for downloading a file from a URL or an alternative
+# URL. Also the SHA1 is checked for the file. Target filename should also
+# be given.
+#
+# If called directly from another script, it will exit the parent script
+# as well, if not called in its own subshell with parentheses.
+
+# shellcheck source=try_catch.sh
+source "${BASH_SOURCE%/*}/try_catch.sh"
+
+ExceptionDownloadPrimaryUrl=100
+ExceptionDownloadAltUrl=101
+ExceptionSHA1=102
+
+function DownloadURL {
+    url=$1
+    url_alt=$2
+    expectedSha1=$3
+    targetFile=$4
+
+    try
+    (
+        try
+        (
+            echo "Downloading from primary URL '$url'"
+            curl --fail -L --retry 5 --retry-delay 5 -o "$targetFile" "$url" || throw $ExceptionDownloadPrimaryUrl
+        )
+        catch || {
+            case $ex_code in
+                $ExceptionDownloadPrimaryUrl)
+                    echo "Failed to download '$url' multiple times"
+                    echo "Downloading tar.gz from alternative URL '$url_alt'"
+                    curl --fail -L --retry 5 --retry-delay 5 -o "$targetFile" "$url_alt" || throw $ExceptionDownloadAltUrl
+                ;;
+            esac
+        }
+        echo "Checking SHA1 on PKG '$targetFile'"
+        echo "$expectedSha1 *$targetFile" | shasum --check || throw $ExceptionSHA1
+    )
+
+    catch || {
+        case $ex_code in
+            $ExceptionDownloadAltUrl)
+                echo "Failed downloading PKG from primary and alternative URLs"
+                exit 1;
+            ;;
+        esac
+    }
+}
+