contrib: add script dump_to_sqlite.sh for direct SQLite3 UTXO dump

Author: theStack

contrib/README.md

@@ -51,3 +51,7 @@ UTXO Set Tools
 This script converts a compact-serialized UTXO set (as generated by Bitcoin Core with `dumptxoutset`)
 to a SQLite3 database. For more details like e.g. the created table name and schema, refer to the
 module docstring on top of the script, which is also contained in the command's `--help` output.
+
+### [Dump-to-SQLite](/contrib/utxo-tools/dump_to_sqlite.sh) ###
+This script creates an UTXO set dump in SQLite3 format on the fly from a running bitcoind instance,
+i.e. with the intermediate step of storing the compact-serialized UTXO set on disk is skipped.

contrib/utxo-tools/dump_to_sqlite.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Copyright (c) 2024-present 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 -e
+
+if [ $# -ne 2 ]; then
+    echo "Usage: $0 <bitcoin-cli-path> <output-file>"
+    exit 1
+fi
+
+BITCOIN_CLI=$1
+OUTPUT_FILE=$2
+UTXO_TO_SQLITE=$(dirname "$0")/utxo_to_sqlite.py
+
+# create named pipe in unique temporary folder
+TEMPPATH=$(mktemp -d)
+FIFOPATH=$TEMPPATH/utxos.fifo
+mkfifo "$FIFOPATH"
+
+# start dumping UTXO set to the pipe in background
+$BITCOIN_CLI dumptxoutset "$FIFOPATH" latest &
+BITCOIN_CLI_PID=$!
+
+# start UTXO to SQLite conversion tool, reading from pipe
+$UTXO_TO_SQLITE "$FIFOPATH" "$OUTPUT_FILE"
+
+# wait and cleanup
+wait $BITCOIN_CLI_PID
+rm -r "$TEMPPATH"