Replace rustfmt_excluded_files with rustfmt_skip cfg attribute

This change removes the custom `rustfmt_excluded_files` mechanism and
instead uses the an attribute at the top of each excluded file.

No functional changes are introduced. This simplifies formatting
workflows by enabling standard `cargo fmt` and editor format-on-save
features without custom scripts.

The older `rustfmt` cfg attribute is used because newer formatting
directives only support code blocks, which would require more effort to
apply consistently. This commit focuses on improving developer
experience by streamlining formatting setup, while more granular or
comprehensive formatting can be addressed later.

Author: joostjager

.github/workflows/build.yml

@@ -305,7 +305,7 @@ jobs:
         run: |
           rustup component add rustfmt
       - name: Run rustfmt checks
-        run: ci/rustfmt.sh
+        run: cargofmt --check
 
   incremental-mutants:
     runs-on: ubuntu-latest

CONTRIBUTING.md

@@ -124,7 +124,7 @@ display fine at any tab-length display setting. We use `rustfmt` to establish
 uniform coding standards throughout the codebase. Please run
 
 ```bash
-./contrib/run-rustfmt.sh
+cargo fmt
 ```
 
 before committing and pushing any changes, as compliance will also be checked

ci/rustfmt.sh

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 //! Utilities that take care of tasks that (1) need to happen periodically to keep Rust-Lightning
 //! running properly, and (2) either can or should be run in the background.
 #![cfg_attr(feature = "std", doc = "See docs for [`BackgroundProcessor`] for more details.")]

contrib/run-rustfmt.sh

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning-background-processor/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/chaininterface.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/chainmonitor.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/channelmonitor.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/mod.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/onchaintx.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/package.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/chain/transaction.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/async_signer_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/blinded_payment_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/chan_utils.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //
@@ -3808,7 +3810,7 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider {
 		if update_fee {
 			debug_assert!(!funding.is_outbound());
 			let counterparty_reserve_we_require_msat = funding.holder_selected_channel_reserve_satoshis * 1000;
-			if commitment_data.stats.remote_balance_before_fee_anchors_msat < commitment_data.stats.total_fee_sat * 1000 + counterparty_reserve_we_require_msat {
+			if commitment_data.stats.remote_balance_before_fee_anchors_msat < commitment_data.stats.total_fee_sat * 1000 + commitment_data.stats.total_anchors_sat * 1000 + counterparty_reserve_we_require_msat {
 				return Err(ChannelError::close("Funding remote cannot afford proposed new fee".to_owned()));
 			}
 		}
@@ -6724,7 +6726,7 @@ impl<SP: Deref> FundedChannel<SP> where
 		);
 		let buffer_fee_msat = commit_tx_fee_sat(feerate_per_kw, commitment_data.tx.nondust_htlcs().len() + htlc_stats.on_holder_tx_outbound_holding_cell_htlcs_count as usize + CONCURRENT_INBOUND_HTLC_FEE_BUFFER as usize, self.funding.get_channel_type()) * 1000;
 		let holder_balance_msat = commitment_data.stats.local_balance_before_fee_anchors_msat - htlc_stats.outbound_holding_cell_msat;
-		if holder_balance_msat < buffer_fee_msat  + self.funding.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000 {
+		if holder_balance_msat < buffer_fee_msat + commitment_data.stats.total_anchors_sat * 1000 + self.funding.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000 {
 			//TODO: auto-close after a number of failures?
 			log_debug!(logger, "Cannot afford to send new feerate at {}", feerate_per_kw);
 			return None;

lightning/src/ln/chanmon_update_fail_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/channel.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/channelmanager.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/functional_test_utils.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/max_payment_path_len_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/mod.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/monitor_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 //! Utilities to decode payment onions and do contextless validation of incoming payments.
 //!
 //! Primarily features [`peel_payment_onion`], which allows the decoding of an onion statelessly

lightning/src/ln/offers_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/onion_payment.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/onion_route_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/outbound_payment.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/peer_handler.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/priv_short_conf_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/reload_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/reorg_tests.rs

@@ -6,8 +6,8 @@ use crate::ln::chan_utils::{
 	COMMITMENT_TX_WEIGHT_PER_HTLC,
 };
 use crate::ln::channel::{
-	get_holder_selected_channel_reserve_satoshis, CONCURRENT_INBOUND_HTLC_FEE_BUFFER,
-	MIN_AFFORDABLE_HTLC_COUNT,
+	get_holder_selected_channel_reserve_satoshis, ANCHOR_OUTPUT_VALUE_SATOSHI,
+	CONCURRENT_INBOUND_HTLC_FEE_BUFFER, MIN_AFFORDABLE_HTLC_COUNT,
 };
 use crate::ln::channelmanager::PaymentId;
 use crate::ln::functional_test_utils::*;
@@ -388,11 +388,22 @@ pub fn test_update_fee_vanilla() {
 	check_added_monitors(&nodes[1], 1);
 }
 
-#[xtest(feature = "_externalize_tests")]
-pub fn test_update_fee_that_funder_cannot_afford() {
+pub fn do_test_update_fee_that_funder_cannot_afford(channel_type_features: ChannelTypeFeatures) {
 	let chanmon_cfgs = create_chanmon_cfgs(2);
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
-	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
+
+	let mut default_config = test_default_channel_config();
+	if channel_type_features == ChannelTypeFeatures::anchors_zero_htlc_fee_and_dependencies() {
+		default_config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
+		// this setting is also needed to create an anchor channel
+		default_config.manually_accept_inbound_channels = true;
+	}
+
+	let node_chanmgrs = create_node_chanmgrs(
+		2,
+		&node_cfgs,
+		&[Some(default_config.clone()), Some(default_config.clone())],
+	);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 
 	let node_a_id = nodes[0].node.get_our_node_id();
@@ -409,22 +420,26 @@ pub fn test_update_fee_that_funder_cannot_afford() {
 	);
 	let channel_id = chan.2;
 	let secp_ctx = Secp256k1::new();
-	let default_config = UserConfig::default();
 	let bs_channel_reserve_sats =
 		get_holder_selected_channel_reserve_satoshis(channel_value, &default_config);
-
-	let channel_type_features = ChannelTypeFeatures::only_static_remote_key();
+	let (anchor_outputs_value_sats, outputs_num_no_htlcs) =
+		if channel_type_features.supports_anchors_zero_fee_htlc_tx() {
+			(ANCHOR_OUTPUT_VALUE_SATOSHI * 2, 4)
+		} else {
+			(0, 2)
+		};
 
 	// Calculate the maximum feerate that A can afford. Note that we don't send an update_fee
 	// CONCURRENT_INBOUND_HTLC_FEE_BUFFER HTLCs before actually running out of local balance, so we
 	// calculate two different feerates here - the expected local limit as well as the expected
 	// remote limit.
-	let feerate = ((channel_value - bs_channel_reserve_sats - push_sats) * 1000
-		/ (commitment_tx_base_weight(&channel_type_features)
-			+ CONCURRENT_INBOUND_HTLC_FEE_BUFFER as u64 * COMMITMENT_TX_WEIGHT_PER_HTLC))
-		as u32;
-	let non_buffer_feerate = ((channel_value - bs_channel_reserve_sats - push_sats) * 1000
-		/ commitment_tx_base_weight(&channel_type_features)) as u32;
+	let feerate =
+		((channel_value - bs_channel_reserve_sats - push_sats - anchor_outputs_value_sats) * 1000
+			/ (commitment_tx_base_weight(&channel_type_features)
+				+ CONCURRENT_INBOUND_HTLC_FEE_BUFFER as u64 * COMMITMENT_TX_WEIGHT_PER_HTLC)) as u32;
+	let non_buffer_feerate =
+		((channel_value - bs_channel_reserve_sats - push_sats - anchor_outputs_value_sats) * 1000
+			/ commitment_tx_base_weight(&channel_type_features)) as u32;
 	{
 		let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 		*feerate_lock = feerate;
@@ -441,8 +456,8 @@ pub fn test_update_fee_that_funder_cannot_afford() {
 	{
 		let commitment_tx = get_local_commitment_txn!(nodes[1], channel_id)[0].clone();
 
-		//We made sure neither party's funds are below the dust limit and there are no HTLCs here
-		assert_eq!(commitment_tx.output.len(), 2);
+		// We made sure neither party's funds are below the dust limit and there are no HTLCs here
+		assert_eq!(commitment_tx.output.len(), outputs_num_no_htlcs);
 		let total_fee: u64 = commit_tx_fee_msat(feerate, 0, &channel_type_features) / 1000;
 		let mut actual_fee =
 			commitment_tx.output.iter().fold(0, |acc, output| acc + output.value.to_sat());
@@ -486,8 +501,8 @@ pub fn test_update_fee_that_funder_cannot_afford() {
 			&remote_point,
 			push_sats,
 			channel_value
-				- push_sats - commit_tx_fee_msat(non_buffer_feerate + 4, 0, &channel_type_features)
-				/ 1000,
+				- push_sats - anchor_outputs_value_sats
+				- commit_tx_fee_msat(non_buffer_feerate + 4, 0, &channel_type_features) / 1000,
 			non_buffer_feerate + 4,
 			nondust_htlcs,
 			&local_chan.funding().channel_transaction_parameters.as_counterparty_broadcastable(),
@@ -526,6 +541,14 @@ pub fn test_update_fee_that_funder_cannot_afford() {
 	check_closed_event!(nodes[1], 1, reason, [node_a_id], channel_value);
 }
 
+#[xtest(feature = "_externalize_tests")]
+pub fn test_update_fee_that_funder_cannot_afford() {
+	do_test_update_fee_that_funder_cannot_afford(ChannelTypeFeatures::only_static_remote_key());
+	do_test_update_fee_that_funder_cannot_afford(
+		ChannelTypeFeatures::anchors_zero_htlc_fee_and_dependencies(),
+	);
+}
+
 #[xtest(feature = "_externalize_tests")]
 pub fn test_update_fee_that_saturates_subs() {
 	// Check that when a remote party sends us an `update_fee` message that results in a total fee

lightning/src/ln/shutdown_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/ln/update_fee_tests.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/routing/mod.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/routing/router.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //

lightning/src/routing/scoring.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 // This file is Copyright its original authors, visible in version control
 // history.
 //