devtools: Add fund_ln command to startup_regtest.sh

fund_ln connects the two peers and funds a channel between them.

contrib/startup_regtest.sh

@@ -134,8 +134,11 @@ start_ln() {
 	# Kick it out of initialblockdownload if necessary
 	if bitcoin-cli -regtest getblockchaininfo | grep -q 'initialblockdownload.*true'; then
 		# Modern bitcoind needs createwallet
+		echo "Making \"default\" bitcoind wallet."
 		bitcoin-cli -regtest createwallet default >/dev/null 2>&1
 		bitcoin-cli -regtest generatetoaddress 1 "$(bitcoin-cli -regtest getnewaddress)" > /dev/null
+	else
+		bitcoin-cli -regtest loadwallet default
 	fi
 	alias bt-cli='bitcoin-cli -regtest'
 
@@ -145,7 +148,44 @@ start_ln() {
 		nodes="$1"
 	fi
 	start_nodes "$nodes" regtest
-	echo "	bt-cli, stop_ln"
+	echo "	bt-cli, stop_ln, fund_ln"
+}
+
+fund_ln() {
+
+	ADDRESS=`bitcoin-cli -regtest getnewaddress`
+	bitcoin-cli -regtest generatetoaddress 50 $ADDRESS
+
+	echo $ADDRESS
+	bitcoin-cli -regtest getbalance
+
+	L2_NODE_ID=`$LCLI --lightning-dir=/tmp/l2-regtest getinfo | jq -r .id`
+	L2_NODE_PORT=`$LCLI --lightning-dir=/tmp/l2-regtest getinfo | jq .binding[0].port`
+
+	echo "Node 2 id/port is : $L2_NODE_ID:$L2_NODE_PORT"
+
+	$LCLI --lightning-dir=/tmp/l1-regtest connect $L2_NODE_ID@localhost:$L2_NODE_PORT
+
+	$LCLI --lightning-dir=/tmp/l1-regtest listpeers
+
+	L1_WALLET_ADDR=`$LCLI --lightning-dir=/tmp/l1-regtest newaddr | jq -r .bech32`
+
+	echo bitcoin-cli -regtest sendtoaddress $L1_WALLET_ADDR 1000
+
+	bitcoin-cli -regtest sendtoaddress $L1_WALLET_ADDR 1000
+
+	bitcoin-cli -regtest generatetoaddress 6 $ADDRESS
+
+	$LCLI --lightning-dir=/tmp/l1-regtest listfunds
+
+	L_CHANNEL_ID=`$LCLI --lightning-dir=/tmp/l1-regtest fundchannel $L2_NODE_ID 1000000 | jq -r .channel_id`
+
+	echo channel id is: $L_CHANNEL_ID
+
+	bitcoin-cli -regtest generatetoaddress 12 $ADDRESS
+
+	$LCLI --lightning-dir=/tmp/l1-regtest listchannels
+	$LCLI --lightning-dir=/tmp/l2-regtest listchannels
 }
 
 stop_nodes() {