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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,240 @@ | ||
| #!/bin/sh | ||
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| # This script is cribbed from the main zcash-sidechain repo: https://github.com/LayerTwo-Labs/zcash-sidechain/blob/master/zcutil/fetch-params.sh | ||
| # It is included here for easier access when starting up the zcash sidechain. | ||
|
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||
| export LC_ALL=C | ||
| set -eu | ||
|
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| uname_S=$(uname -s 2>/dev/null || echo not) | ||
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| if [ "$uname_S" = "Darwin" ]; then | ||
| PARAMS_DIR="$HOME/Library/Application Support/ZcashParams" | ||
| else | ||
| PARAMS_DIR="$HOME/.zcash-params" | ||
| fi | ||
|
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||
| # Commented out because these are unused; see below. | ||
| #SPROUT_PKEY_NAME='sprout-proving.key' | ||
| #SPROUT_VKEY_NAME='sprout-verifying.key' | ||
| SAPLING_SPEND_NAME='sapling-spend.params' | ||
| SAPLING_OUTPUT_NAME='sapling-output.params' | ||
| SAPLING_SPROUT_GROTH16_NAME='sprout-groth16.params' | ||
| DOWNLOAD_URL="https://download.z.cash/downloads" | ||
| IPFS_HASH="/ipfs/QmXRHVGLQBiKwvNq7c2vPxAKz1zRVmMYbmt7G5TQss7tY7" | ||
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| SHA256CMD="$(command -v sha256sum || echo shasum)" | ||
| SHA256ARGS="$(command -v sha256sum >/dev/null || echo '-a 256')" | ||
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| WGETCMD="$(command -v wget || echo '')" | ||
| IPFSCMD="$(command -v ipfs || echo '')" | ||
| CURLCMD="$(command -v curl || echo '')" | ||
|
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| # fetch methods can be disabled with ZC_DISABLE_SOMETHING=1 | ||
| ZC_DISABLE_WGET="${ZC_DISABLE_WGET:-}" | ||
| ZC_DISABLE_IPFS="${ZC_DISABLE_IPFS:-}" | ||
| ZC_DISABLE_CURL="${ZC_DISABLE_CURL:-}" | ||
|
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| LOCKFILE=/tmp/fetch_params.lock | ||
|
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| fetch_wget() { | ||
| if [ -z "$WGETCMD" ] || ! [ -z "$ZC_DISABLE_WGET" ]; then | ||
| return 1 | ||
| fi | ||
|
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||
| cat <<EOF | ||
| Retrieving (wget): $DOWNLOAD_URL/$1 | ||
| EOF | ||
|
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||
| wget \ | ||
| --progress=dot:giga \ | ||
| --output-document="$2" \ | ||
| --continue \ | ||
| --retry-connrefused --waitretry=3 --timeout=30 \ | ||
| "$DOWNLOAD_URL/$1" | ||
| } | ||
|
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||
| fetch_ipfs() { | ||
| if [ -z "$IPFSCMD" ] || ! [ -z "$ZC_DISABLE_IPFS" ]; then | ||
| return 1 | ||
| fi | ||
|
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||
| cat <<EOF | ||
| Retrieving (ipfs): $IPFS_HASH/$1 | ||
| EOF | ||
|
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||
| ipfs get --output "$2" "$IPFS_HASH/$1" | ||
| } | ||
|
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| fetch_curl() { | ||
| if [ -z "$CURLCMD" ] || ! [ -z "$ZC_DISABLE_CURL" ]; then | ||
| return 1 | ||
| fi | ||
|
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||
| cat <<EOF | ||
| Retrieving (curl): $DOWNLOAD_URL/$1 | ||
| EOF | ||
|
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||
| curl \ | ||
| --output "$2" \ | ||
| -# -L -C - \ | ||
| "$DOWNLOAD_URL/$1" | ||
|
|
||
| } | ||
|
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| fetch_failure() { | ||
| cat >&2 <<EOF | ||
| Failed to fetch the Zcash zkSNARK parameters! | ||
| Try installing one of the following programs and make sure you're online: | ||
| * ipfs | ||
| * wget | ||
| * curl | ||
| EOF | ||
| exit 1 | ||
| } | ||
|
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||
| fetch_params() { | ||
| # We only set these variables inside this function, | ||
| # and unset them at the end of the function. | ||
| filename="$1" | ||
| output="$2" | ||
| dlname="${output}.dl" | ||
| expectedhash="$3" | ||
|
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||
| if ! [ -f "$output" ] | ||
| then | ||
| for i in 1 2 | ||
| do | ||
| for method in wget ipfs curl failure; do | ||
| if "fetch_$method" "${filename}.part.${i}" "${dlname}.part.${i}"; then | ||
| echo "Download of part ${i} successful!" | ||
| break | ||
| fi | ||
| done | ||
| done | ||
|
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||
| for i in 1 2 | ||
| do | ||
| if ! [ -f "${dlname}.part.${i}" ] | ||
| then | ||
| fetch_failure | ||
| fi | ||
| done | ||
|
|
||
| cat "${dlname}.part.1" "${dlname}.part.2" > "${dlname}" | ||
| rm "${dlname}.part.1" "${dlname}.part.2" | ||
|
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| "$SHA256CMD" $SHA256ARGS -c <<EOF | ||
| $expectedhash $dlname | ||
| EOF | ||
|
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||
| # Check the exit code of the shasum command: | ||
| CHECKSUM_RESULT=$? | ||
| if [ $CHECKSUM_RESULT -eq 0 ]; then | ||
| mv -v "$dlname" "$output" | ||
| else | ||
| echo "Failed to verify parameter checksums!" >&2 | ||
| exit 1 | ||
| fi | ||
| fi | ||
|
|
||
| unset -v filename | ||
| unset -v output | ||
| unset -v dlname | ||
| unset -v expectedhash | ||
| } | ||
|
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||
| # Use flock to prevent parallel execution. | ||
| lock() { | ||
| if [ "$uname_S" = "Darwin" ]; then | ||
| if shlock -f ${LOCKFILE} -p $$; then | ||
| return 0 | ||
| else | ||
| return 1 | ||
| fi | ||
| else | ||
| # create lock file | ||
| eval "exec 9>$LOCKFILE" | ||
| # acquire the lock | ||
| flock -n 9 \ | ||
| && return 0 \ | ||
| || return 1 | ||
| fi | ||
| } | ||
|
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| exit_locked_error() { | ||
| echo "Only one instance of fetch-params.sh can be run at a time." >&2 | ||
| exit 1 | ||
| } | ||
|
|
||
| main() { | ||
|
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||
| lock fetch-params.sh \ | ||
| || exit_locked_error | ||
|
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||
| cat <<EOF | ||
| Zcash - fetch-params.sh | ||
| This script will fetch the Zcash zkSNARK parameters and verify their | ||
| integrity with sha256sum. | ||
| If they already exist locally, it will exit now and do nothing else. | ||
| EOF | ||
|
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||
| # Now create PARAMS_DIR and insert a README if necessary: | ||
| if ! [ -d "$PARAMS_DIR" ] | ||
| then | ||
| mkdir -p "$PARAMS_DIR" | ||
| README_PATH="$PARAMS_DIR/README" | ||
| cat >> "$README_PATH" <<EOF | ||
| This directory stores common Zcash zkSNARK parameters. Note that it is | ||
| distinct from the daemon's -datadir argument because the parameters are | ||
| large and may be shared across multiple distinct -datadir's such as when | ||
| setting up test networks. | ||
| EOF | ||
|
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||
| # This may be the first time the user's run this script, so give | ||
| # them some info, especially about bandwidth usage: | ||
| cat <<EOF | ||
| The complete parameters are currently just under 1.7GB in size, so plan | ||
| accordingly for your bandwidth constraints. If the Sprout parameters are | ||
| already present the additional Sapling parameters required are just under | ||
| 800MB in size. If the files are already present and have the correct | ||
| sha256sum, no networking is used. | ||
| Creating params directory. For details about this directory, see: | ||
| $README_PATH | ||
| EOF | ||
| fi | ||
|
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||
| cd "$PARAMS_DIR" | ||
|
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||
| # Sprout parameters: | ||
| # Commented out because they are unneeded, but we will eventually update | ||
| # this to delete the parameters if possible. | ||
| #fetch_params "$SPROUT_PKEY_NAME" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7" | ||
| #fetch_params "$SPROUT_VKEY_NAME" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82" | ||
|
|
||
| # Sapling parameters: | ||
| fetch_params "$SAPLING_SPEND_NAME" "$PARAMS_DIR/$SAPLING_SPEND_NAME" "8e48ffd23abb3a5fd9c5589204f32d9c31285a04b78096ba40a79b75677efc13" | ||
| fetch_params "$SAPLING_OUTPUT_NAME" "$PARAMS_DIR/$SAPLING_OUTPUT_NAME" "2f0ebbcbb9bb0bcffe95a397e7eba89c29eb4dde6191c339db88570e3f3fb0e4" | ||
| fetch_params "$SAPLING_SPROUT_GROTH16_NAME" "$PARAMS_DIR/$SAPLING_SPROUT_GROTH16_NAME" "b685d700c60328498fbde589c8c7c484c722b788b265b72af448a5bf0ee55b50" | ||
| } | ||
|
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||
| if [ "x${1:-}" = 'x--testnet' ] | ||
| then | ||
| echo "NOTE: testnet now uses the mainnet parameters, so the --testnet argument" | ||
| echo "is no longer needed (ignored)" | ||
| echo "" | ||
| fi | ||
|
|
||
| main | ||
| rm -f $LOCKFILE | ||
| exit 0 |