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#!/bin/sh
#############################################################################
##
## Copyright (C) 2019 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the provisioning scripts of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:LGPL$
## 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 https://www.qt.io/terms-conditions. For further
## information use the contact form at https://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 3 as published by the Free Software
## Foundation and appearing in the file LICENSE.LGPL3 included in the
## packaging of this file. Please review the following information to
## ensure the GNU Lesser General Public License version 3 requirements
## will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 2.0 or (at your option) the GNU General
## Public license version 3 or any later version approved by the KDE Free
## Qt Foundation. The licenses are as published by the Free Software
## Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
## included in the packaging of this file. Please review the following
## information to ensure the GNU General Public License requirements will
## be met: https://www.gnu.org/licenses/gpl-2.0.html and
## https://www.gnu.org/licenses/gpl-3.0.html.
##
## $QT_END_LICENSE$
##
#############################################################################
# A helper script used for downloading a file from a URL or an alternative
# URL. Also the SHA is checked for the file (SHA algorithm is autodetected
# based on the SHA length). Target filename should also be given.
############################ BOILERPLATE ###############################
command -v sha1sum >/dev/null || sha1sum () { shasum -a 1 "$@" ; }
command -v sha256sum >/dev/null || sha256sum () { shasum -a 256 "$@" ; }
command -v sha384sum >/dev/null || sha384sum () { shasum -a 384 "$@" ; }
command -v sha512sum >/dev/null || sha512sum () { shasum -a 512 "$@" ; }
########################################################################
Download () {
url="$1"
targetFile="$2"
command -v curl >/dev/null \
&& curl --fail -L --retry 5 --retry-delay 5 -o "$targetFile" "$url" \
|| wget --tries 5 -O "$targetFile" "$url"
}
VerifyHash () {
file=$1
expectedHash=$2
if [ ! -f "$file" ]
then return 2 # file does not exist
fi
hashLength="$(echo "$expectedHash" | wc -c | sed 's/ *//g')"
# Use backticks because of bug with bash-3 (default on macOS),
# caused when there are unbalanced parentheses inside $()
# shellcheck disable=SC2006
hash=`case "$hashLength" in
41) sha1sum "$file" ;;
65) sha256sum "$file" ;;
97) sha384sum "$file" ;;
129) sha512sum "$file" ;;
*) echo "FATAL! Unknown hash length: $hashLength" 1>&2 && exit 1 ;;
esac | cut -d ' ' -f 1`
if [ ! "$expectedHash" = "$hash" ]
then
echo "FAIL! wrong file hash: $file $hash" 1>&2
return 1
fi
echo "OK verified integrity of: $file"
}
# Check if file already exists and is good, otherwise download it
DownloadURL () {
url=$1
url2=$2
expectedHash=$3
# Optional argument $4: destination filename
if [ x"$4" = x ]
then
# defaults to the last component of $url
targetFile=$(echo $url | sed 's|^.*/||')
else
targetFile=$4
fi
# If a non-empty file already exists
if [ -s "$targetFile" ]
then
if VerifyHash "$targetFile" "$expectedHash"
then
echo "Skipping download, found and validated existing file: $targetFile"
return
else
echo "WARNING: Non-empty but different file found at destination; will re-download and overwrite file: $targetFile"
fi
fi
echo "Downloading from primary URL: $url"
if ! Download "$url" "$targetFile"
then
echo "FAIL! to download, trying alternative URL: $url2" 1>&2
if ! Download "$url2" "$targetFile"
then
echo 'FAIL! to download even from alternative URL' 1>&2
return 1
fi
fi
VerifyHash "$targetFile" "$expectedHash"
}
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