121 lines
3.3 KiB
Bash
Executable File
121 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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set -eu
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if [[ "$OSTYPE" == "darwin"* ]]; then
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PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"
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else
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PARAMS_DIR="$HOME/.zcash-params"
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fi
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SPROUT_PKEY_NAME='sprout-proving.key'
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SPROUT_VKEY_NAME='sprout-verifying.key'
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SPROUT_PKEY_URL="https://z.cash/downloads/$SPROUT_PKEY_NAME"
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SPROUT_VKEY_URL="https://z.cash/downloads/$SPROUT_VKEY_NAME"
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SHA256CMD="$(command -v sha256sum || echo shasum)"
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SHA256ARGS="$(command -v sha256sum >/dev/null || echo '-a 256')"
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function fetch_params {
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local url="$1"
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local output="$2"
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local dlname="${output}.dl"
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local expectedhash="$3"
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if ! [ -f "$output" ]; then
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echo "Retrieving: $url"
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if [[ $(sw_vers -productName) == "Mac OS X" ]]; then
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curl \
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--output "$dlname" \
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-# -L -C - \
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"$url"
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else
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wget \
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--progress=dot:giga \
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--output-document="$dlname" \
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--continue \
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--retry-connrefused --waitretry=3 --timeout=30 \
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"$url"
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fi
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"$SHA256CMD" $SHA256ARGS -c <<EOF
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$expectedhash $dlname
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EOF
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# Check the exit code of the shasum command:
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CHECKSUM_RESULT=$?
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if [ $CHECKSUM_RESULT -eq 0 ]; then
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mv -v "$dlname" "$output"
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else
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echo "Failed to verify parameter checksums!"
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exit 1
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fi
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fi
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}
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# Use flock to prevent parallel execution.
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function lock() {
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local lockfile=/tmp/fetch_params.lock
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# create lock file
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eval "exec 200>/$lockfile"
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# acquire the lock
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flock -n 200 \
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&& return 0 \
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|| return 1
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}
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function exit_locked_error {
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echo "Only one instance of fetch-params.sh can be run at a time." >&2
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#exit 1
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}
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function main() {
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lock fetch-params.sh \
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|| exit_locked_error
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cat <<EOF
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BTCPrivate - fetch-params.sh
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This script will fetch the BTCPrivate zkSNARK parameters and verify their
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integrity with sha256sum. These parameters are identical to those for
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both ZClassic and ZCash.
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If they already exist locally, it will exit now and do nothing else.
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EOF
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# Now create PARAMS_DIR and insert a README if necessary:
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if ! [ -d "$PARAMS_DIR" ]
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then
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mkdir -p "$PARAMS_DIR"
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README_PATH="$PARAMS_DIR/README"
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cat >> "$README_PATH" <<EOF
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This directory stores common BTCPrivate zkSNARK parameters. Note that it is
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distinct from the daemon's -datadir argument because the parameters are
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large and may be shared across multiple distinct -datadir's such as when
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setting up test networks.
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EOF
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# This may be the first time the user's run this script, so give
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# them some info, especially about bandwidth usage:
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cat <<EOF
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The parameters are currently just under 911MB in size, so plan accordingly
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for your bandwidth constraints. If the files are already present and
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have the correct sha256sum, no networking is used.
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Creating params directory. For details about this directory, see:
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$README_PATH
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EOF
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fi
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cd "$PARAMS_DIR"
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fetch_params "$SPROUT_PKEY_URL" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"
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fetch_params "$SPROUT_VKEY_URL" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"
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}
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main
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rm -f /tmp/fetch_params.lock
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exit 0
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