f964718c83
This will retry upon refused connections and similar errors, wait 1 second before the next retry, time out after 10 seconds if no data is received or the connection times out, plus try an infinite number of times.
105 lines
2.7 KiB
Bash
Executable File
105 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
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set -eu
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PARAMS_DIR="$HOME/.zcash-params"
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BETA2_PKEY_NAME='beta2-proving.key'
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BETA2_VKEY_NAME='beta2-verifying.key'
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BETA2_PKEY_URL="https://z.cash/downloads/$BETA2_PKEY_NAME"
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BETA2_VKEY_URL="https://z.cash/downloads/$BETA2_VKEY_NAME"
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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" ]
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then
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echo "Retrieving: $url"
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wget \
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--progress=dot:giga \
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--output-document="$dlname" \
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--continue \
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--retry-connrefused --waitretry=1 --timeout=10 --tries 0 \
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"$url"
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shasum -a 256 --check <<EOF
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$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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Zcash - fetch-params.sh
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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 Zcash 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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This script will fetch the Zcash zkSNARK parameters and verify their
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integrity with sha256sum.
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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 "$BETA2_PKEY_URL" "$PARAMS_DIR/$BETA2_PKEY_NAME" "cca9887becf803c8ca801bc9da8fcba4f5fb3ba13af9d17e8603021a150cb4b7"
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fetch_params "$BETA2_VKEY_URL" "$PARAMS_DIR/$BETA2_VKEY_NAME" "2faffd2a5e2e67276c3471c48068a0c16f62286d2e4622a733d7cd1f82ffa860"
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}
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main
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exit 0
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