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