startup_regtest: configure clnrest and generate rune

This allows use of clnrest + websocket in the regtest environment.
Also uses the snap installed bitcoind path if appropriate.

Format of the start_ln output is:
Commands:
	l1-cli, l1-log,
	l2-cli, l2-log,
	bt-cli, stop_ln, fund_nodes
Node Info:
	l1 rest: https://127.0.0.1:3110  rune: "lgkWSp0PQK-pkbElLpjcNVQnX7yfEjouJaJHjLuW8w89OA=="
	l2 rest: https://127.0.0.1:3111  rune: "sUqGqkevGYG2r1e_JUiz8Me00GhtTv5-IuGk4o9Beyc9OQ=="

Changelog-None

contrib/startup_regtest.sh

@@ -49,7 +49,9 @@ else
 fi
 
 if [ -z "$PATH_TO_BITCOIN" ]; then
-	if [ -d "$HOME/.bitcoin" ]; then
+	if [ -d "$HOME/snap/bitcoin-core/common/.bitcoin" ]; then
+		PATH_TO_BITCOIN="$HOME/snap/bitcoin-core/common/.bitcoin"
+	elif [ -d "$HOME/.bitcoin" ]; then
 		PATH_TO_BITCOIN="$HOME/.bitcoin"
 	elif [ -d "$HOME/Library/Application Support/Bitcoin/" ]; then
 		PATH_TO_BITCOIN="$HOME/Library/Application Support/Bitcoin/"
@@ -92,6 +94,7 @@ start_nodes() {
 		log-file=/tmp/l$i-$network/log
 		addr=localhost:$socket
 		allow-deprecated-apis=false
+		rest-port=$((3109+i))
 		EOF
 
 		# If we've configured to use developer, add dev options
@@ -127,8 +130,10 @@ start_nodes() {
 	if [ -z "$EATMYDATA" ]; then
 	    echo "WARNING: eatmydata not found: install it for faster testing"
 	fi
+	sleep 2
 	# Give a hint.
 	echo "Commands: "
+
 	for i in $(seq "$node_count"); do
 		echo "	l$i-cli, l$i-log,"
 	done
@@ -169,6 +174,7 @@ start_ln() {
 	fi
 	start_nodes "$nodes" regtest
 	echo "	bt-cli, stop_ln, fund_nodes"
+	node_info regtest
 }
 
 ensure_bitcoind_funds() {
@@ -292,6 +298,17 @@ stop_ln() {
 	unalias bt-cli
 }
 
+node_info() {
+	network=${1:-regtest}
+	if [ -n "$LN_NODES" ]; then
+		echo "Node Info:"
+		for i in $(seq "$LN_NODES"); do
+			echo "	l$i rest: https://127.0.0.1:$((3109 + i))"\
+			" rune: $($LCLI --lightning-dir=/tmp/l"$i-$network" createrune | jq .rune)"
+		done
+	fi
+}
+
 destroy_ln() {
 	network=${1:-regtest}
 	rm -rf /tmp/l[0-9]*-"$network"