FOSS-VG/scripts/download.sh

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if [ "$#" -lt 3 -o "$#" -gt 3 ]; then
echo "Usage: $0 URL DESTINATION SHA256SUM"
exit 1
fi
source scripts/lib.sh
URL="$1"
DESTINATION="$2"
SHA256SUM="$3"
if command -v wget >/dev/null 2>&1; then
USE_WGET=yes
else
if command -v curl >/dev/null 2>&1; then
USE_WGET=no
else
echo "Found neither wget nor curl. Aborting."
exit 1
fi
fi
if [ ! -d .download_cache ]; then
echo "Cache directory missing."
create_directory .download_cache
fi
#TODO: keep track of which cached file is downloaded to which destination
#TODO: when downloading a file with a new hash to the same destination, mark the old one as no longer in use
#TODO: if there is an even older one for the same download path, delete it
#TODO: remove cache maintenance from clean_dependencies
if [ -f ".download_cache/$SHA256SUM" ]; then
if check_sha256 ".download_cache/$SHA256SUM" "$SHA256SUM"; then
echo "Using locally cached file for $DESTINATION"
cp ".download_cache/$SHA256SUM" "$DESTINATION"
exit 0
else
echo "Locally cached file for $DESTINATION is corrupted."
rm ".download_cache/$SHA256SUM"
$0 "$URL" "$DESTINATION" "$SHA256SUM"
exit $?
fi
else
echo -n "Downloading $URL to $DESTINATION... "
if [ $USE_WGET = yes ]; then
wget -O ".download_cache/$SHA256SUM" "$URL" >/dev/null 2>&1
else
curl -L "$URL" --output ".download_cache/$SHA256SUM" >/dev/null 2>&1
fi
if check_sha256 ".download_cache/$SHA256SUM" "$SHA256SUM"; then
cp ".download_cache/$SHA256SUM" "$DESTINATION"
echo "done."
exit 0
else
echo "error."
echo "Checksum verification failed. Your download is either corrupted or the file has been altered. Removing file."
rm ".download_cache/$SHA256SUM"
exit 1
fi
fi