channel_tx: add the commitment sig and pubkey data to the commit tx

needs to be update elsewhere too!

channeld/channeld.c

@@ -12,6 +12,7 @@
  */
 #include <bitcoin/chainparams.h>
 #include <bitcoin/privkey.h>
+#include <bitcoin/psbt.h>
 #include <bitcoin/script.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/cast/cast.h>
@@ -1289,6 +1290,10 @@ static void handle_peer_commit_sig(struct peer *peer, const u8 *msg)
 			&funding_wscript, peer->channel, &peer->next_local_per_commit,
 			peer->next_index[LOCAL], LOCAL);
 
+	/* Set the commit_sig on the commitment tx psbt */
+	psbt_input_set_partial_sig(txs[0]->psbt, 0,
+	    &peer->channel->funding_pubkey[REMOTE], &commit_sig);
+
 	if (!derive_simple_key(&peer->channel->basepoints[REMOTE].htlc,
 			       &peer->next_local_per_commit, &remote_htlckey))
 		status_failed(STATUS_FAIL_INTERNAL_ERROR,

channeld/full_channel.c

@@ -1,6 +1,7 @@
 #include <assert.h>
 #include <bitcoin/chainparams.h>
 #include <bitcoin/preimage.h>
+#include <bitcoin/psbt.h>
 #include <bitcoin/script.h>
 #include <bitcoin/tx.h>
 #include <ccan/array_size/array_size.h>
@@ -311,6 +312,12 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
 	    commitment_number ^ channel->commitment_number_obscurer,
 	    side);
 
+	/* Set the remote/local pubkeys on the commitment tx psbt */
+	psbt_input_add_pubkey(txs[0]->psbt, 0,
+			      &channel->funding_pubkey[side]);
+	psbt_input_add_pubkey(txs[0]->psbt, 0,
+			      &channel->funding_pubkey[!side]);
+
 	add_htlcs(&txs, *htlcmap, channel, &keyset, side);
 
 	tal_free(committed);

common/initial_channel.c

@@ -1,5 +1,6 @@
 #include <assert.h>
 #include <bitcoin/chainparams.h>
+#include <bitcoin/psbt.h>
 #include <bitcoin/script.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/cast/cast.h>
@@ -76,6 +77,7 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				      char** err_reason)
 {
 	struct keyset keyset;
+	struct bitcoin_tx *init_tx;
 
 	/* This assumes no HTLCs! */
 	assert(!channel->htlcs);
@@ -93,8 +95,7 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				       &channel->funding_pubkey[side],
 				       &channel->funding_pubkey[!side]);
 
-	return initial_commit_tx(ctx,
-				 &channel->funding_txid,
+	init_tx = initial_commit_tx(ctx, &channel->funding_txid,
 				    channel->funding_txout,
 				    channel->funding,
 				    cast_const(u8 *, *wscript),
@@ -111,6 +112,15 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				    direct_outputs,
 				    side,
 				    err_reason);
+
+	if (init_tx) {
+		psbt_input_add_pubkey(init_tx->psbt, 0,
+				      &channel->funding_pubkey[side]);
+		psbt_input_add_pubkey(init_tx->psbt, 0,
+				      &channel->funding_pubkey[!side]);
+	}
+
+	return init_tx;
 }
 
 u32 channel_feerate(const struct channel *channel, enum side side)

openingd/openingd.c

@@ -10,6 +10,7 @@
 #include <bitcoin/block.h>
 #include <bitcoin/chainparams.h>
 #include <bitcoin/privkey.h>
+#include <bitcoin/psbt.h>
 #include <bitcoin/script.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/breakpoint/breakpoint.h>
@@ -844,6 +845,12 @@ static bool funder_finalize_channel_setup(struct state *state,
 					   &state->their_funding_pubkey));
 	}
 
+	/* We save their sig to our first commitment tx */
+	psbt_input_set_partial_sig((*tx)->psbt, 0,
+				   &state->their_funding_pubkey,
+				   sig);
+
+
 	peer_billboard(false, "Funding channel: opening negotiation succeeded");
 
 	return true;