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#!/usr/bin/env bash
#
# Copyright (c) 2019-2023 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
export LC_ALL=C
set -ueo pipefail
NETWORK_DISABLED=false
if (( $# < 3 )); then
echo 'Usage: utxo_snapshot.sh <generate-at-height> <snapshot-out-path> <bitcoin-cli-call ...>'
echo
echo " if <snapshot-out-path> is '-', don't produce a snapshot file but instead print the "
echo " expected assumeutxo hash"
echo
echo 'Examples:'
echo
echo " ./contrib/devtools/utxo_snapshot.sh 570000 utxo.dat ./src/bitcoin-cli -datadir=\$(pwd)/testdata"
echo ' ./contrib/devtools/utxo_snapshot.sh 570000 - ./src/bitcoin-cli'
exit 1
fi
GENERATE_AT_HEIGHT="${1}"; shift;
OUTPUT_PATH="${1}"; shift;
# Most of the calls we make take a while to run, so pad with a lengthy timeout.
BITCOIN_CLI_CALL="${*} -rpcclienttimeout=9999999"
# Check if the node is pruned and get the pruned block height
PRUNED=$( ${BITCOIN_CLI_CALL} getblockchaininfo | awk '/pruneheight/ {print $2}' | tr -d ',' )
if (( GENERATE_AT_HEIGHT < PRUNED )); then
echo "Error: The requested snapshot height (${GENERATE_AT_HEIGHT}) should be greater than the pruned block height (${PRUNED})."
exit 1
fi
# Check current block height to ensure the node has synchronized past the required block
CURRENT_BLOCK_HEIGHT=$(${BITCOIN_CLI_CALL} getblockcount)
PIVOT_BLOCK_HEIGHT=$(( GENERATE_AT_HEIGHT + 1 ))
if (( PIVOT_BLOCK_HEIGHT > CURRENT_BLOCK_HEIGHT )); then
(>&2 echo "Error: The node has not yet synchronized to block height ${PIVOT_BLOCK_HEIGHT}.")
(>&2 echo "Please wait until the node has synchronized past this block height and try again.")
exit 1
fi
# Early exit if file at OUTPUT_PATH already exists
if [[ -e "$OUTPUT_PATH" ]]; then
(>&2 echo "Error: $OUTPUT_PATH already exists or is not a valid path.")
exit 1
fi
# Validate that the path is correct
if [[ "${OUTPUT_PATH}" != "-" && ! -d "$(dirname "${OUTPUT_PATH}")" ]]; then
(>&2 echo "Error: The directory $(dirname "${OUTPUT_PATH}") does not exist.")
exit 1
fi
function cleanup {
(>&2 echo "Restoring chain to original height; this may take a while")
${BITCOIN_CLI_CALL} reconsiderblock "${PIVOT_BLOCKHASH}"
if $NETWORK_DISABLED; then
(>&2 echo "Restoring network activity")
${BITCOIN_CLI_CALL} setnetworkactive true
fi
}
function early_exit {
(>&2 echo "Exiting due to Ctrl-C")
cleanup
exit 1
}
# Prompt the user to disable network activity
read -p "Do you want to disable network activity (setnetworkactive false) before running invalidateblock? (Y/n): " -r
if [[ "$REPLY" =~ ^[Yy]*$ || -z "$REPLY" ]]; then
# User input is "Y", "y", or Enter key, proceed with the action
NETWORK_DISABLED=true
(>&2 echo "Disabling network activity")
${BITCOIN_CLI_CALL} setnetworkactive false
else
(>&2 echo "Network activity remains enabled")
fi
# Block we'll invalidate/reconsider to rewind/fast-forward the chain.
PIVOT_BLOCKHASH=$($BITCOIN_CLI_CALL getblockhash $(( GENERATE_AT_HEIGHT + 1 )) )
# Trap for normal exit and Ctrl-C
trap cleanup EXIT
trap early_exit INT
(>&2 echo "Rewinding chain back to height ${GENERATE_AT_HEIGHT} (by invalidating ${PIVOT_BLOCKHASH}); this may take a while")
${BITCOIN_CLI_CALL} invalidateblock "${PIVOT_BLOCKHASH}"
if [[ "${OUTPUT_PATH}" = "-" ]]; then
(>&2 echo "Generating txoutset info...")
${BITCOIN_CLI_CALL} gettxoutsetinfo | grep hash_serialized_3 | sed 's/^.*: "\(.\+\)\+",/\1/g'
else
(>&2 echo "Generating UTXO snapshot...")
${BITCOIN_CLI_CALL} dumptxoutset "${OUTPUT_PATH}"
fi
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