Add rustfmt to CI, ignore all files

We add the previously discussed `rustfmt.toml` and enforce it in CI for
any files that are not contained in an exclusion list.

To start, we add all current Rust files to this exclusion list. This
means that formatter rules will be enforced for any newly introduced
files, and we'll then start going through the codebase file-by-file,
removing them from the list as we go.

Author: tnull

.github/workflows/build.yml

@@ -216,3 +216,20 @@ jobs:
       - name: Run default clippy linting
         run: |
           cargo clippy -- -Aclippy::erasing_op -Aclippy::never_loop -Aclippy::if_same_then_else -Dclippy::try_err
+
+  rustfmt:
+    runs-on: ubuntu-latest
+    env:
+      TOOLCHAIN: 1.63.0
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v3
+      - name: Install Rust ${{ env.TOOLCHAIN }} toolchain
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile=minimal --default-toolchain ${{ env.TOOLCHAIN }}
+          rustup override set ${{ env.TOOLCHAIN }}
+      - name: Install rustfmt
+        run: |
+          rustup component add rustfmt
+      - name: Run rustfmt checks
+        run: ci/rustfmt.sh

ci/rustfmt.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -eox pipefail
+
+# Generate initial exclusion list
+#find . -name '*.rs' -type f |sort >rustfmt_excluded_files
+
+# Run fmt
+TMP_FILE=$(mktemp)
+find . -name '*.rs' -type f |sort >$TMP_FILE
+for file in $(comm -23 $TMP_FILE rustfmt_excluded_files); do
+	echo "Checking formatting of $file"
+	rustfmt +1.63.0 --check $file
+done

rustfmt.toml

@@ -1 +1,12 @@
-disable_all_formatting = true
+use_small_heuristics = "Max"
+fn_args_layout = "Compressed"
+hard_tabs = true
+use_field_init_shorthand = true
+max_width = 100
+match_block_trailing_comma = true
+# UNSTABLE: format_code_in_doc_comments = true
+# UNSTABLE: overflow_delimited_expr = true
+# UNSTABLE: comment_width = 100
+# UNSTABLE: format_macro_matchers = true
+# UNSTABLE: format_strings = true
+# UNSTABLE: group_imports = "StdExternalCrate"

rustfmt_excluded_files

@@ -0,0 +1,270 @@
+./bench/benches/bench.rs
+./fuzz/src/base32.rs
+./fuzz/src/bech32_parse.rs
+./fuzz/src/bin/base32_target.rs
+./fuzz/src/bin/bech32_parse_target.rs
+./fuzz/src/bin/chanmon_consistency_target.rs
+./fuzz/src/bin/chanmon_deser_target.rs
+./fuzz/src/bin/fromstr_to_netaddress_target.rs
+./fuzz/src/bin/full_stack_target.rs
+./fuzz/src/bin/indexedmap_target.rs
+./fuzz/src/bin/invoice_deser_target.rs
+./fuzz/src/bin/invoice_request_deser_target.rs
+./fuzz/src/bin/msg_accept_channel_target.rs
+./fuzz/src/bin/msg_accept_channel_v2_target.rs
+./fuzz/src/bin/msg_announcement_signatures_target.rs
+./fuzz/src/bin/msg_channel_announcement_target.rs
+./fuzz/src/bin/msg_channel_details_target.rs
+./fuzz/src/bin/msg_channel_ready_target.rs
+./fuzz/src/bin/msg_channel_reestablish_target.rs
+./fuzz/src/bin/msg_channel_update_target.rs
+./fuzz/src/bin/msg_closing_signed_target.rs
+./fuzz/src/bin/msg_commitment_signed_target.rs
+./fuzz/src/bin/msg_decoded_onion_error_packet_target.rs
+./fuzz/src/bin/msg_error_message_target.rs
+./fuzz/src/bin/msg_funding_created_target.rs
+./fuzz/src/bin/msg_funding_signed_target.rs
+./fuzz/src/bin/msg_gossip_timestamp_filter_target.rs
+./fuzz/src/bin/msg_init_target.rs
+./fuzz/src/bin/msg_node_announcement_target.rs
+./fuzz/src/bin/msg_open_channel_target.rs
+./fuzz/src/bin/msg_open_channel_v2_target.rs
+./fuzz/src/bin/msg_ping_target.rs
+./fuzz/src/bin/msg_pong_target.rs
+./fuzz/src/bin/msg_query_channel_range_target.rs
+./fuzz/src/bin/msg_query_short_channel_ids_target.rs
+./fuzz/src/bin/msg_reply_channel_range_target.rs
+./fuzz/src/bin/msg_reply_short_channel_ids_end_target.rs
+./fuzz/src/bin/msg_revoke_and_ack_target.rs
+./fuzz/src/bin/msg_shutdown_target.rs
+./fuzz/src/bin/msg_splice_ack_target.rs
+./fuzz/src/bin/msg_splice_locked_target.rs
+./fuzz/src/bin/msg_splice_target.rs
+./fuzz/src/bin/msg_stfu_target.rs
+./fuzz/src/bin/msg_tx_abort_target.rs
+./fuzz/src/bin/msg_tx_ack_rbf_target.rs
+./fuzz/src/bin/msg_tx_add_input_target.rs
+./fuzz/src/bin/msg_tx_add_output_target.rs
+./fuzz/src/bin/msg_tx_complete_target.rs
+./fuzz/src/bin/msg_tx_init_rbf_target.rs
+./fuzz/src/bin/msg_tx_remove_input_target.rs
+./fuzz/src/bin/msg_tx_remove_output_target.rs
+./fuzz/src/bin/msg_tx_signatures_target.rs
+./fuzz/src/bin/msg_update_add_htlc_target.rs
+./fuzz/src/bin/msg_update_fail_htlc_target.rs
+./fuzz/src/bin/msg_update_fail_malformed_htlc_target.rs
+./fuzz/src/bin/msg_update_fee_target.rs
+./fuzz/src/bin/msg_update_fulfill_htlc_target.rs
+./fuzz/src/bin/offer_deser_target.rs
+./fuzz/src/bin/onion_hop_data_target.rs
+./fuzz/src/bin/onion_message_target.rs
+./fuzz/src/bin/peer_crypt_target.rs
+./fuzz/src/bin/process_network_graph_target.rs
+./fuzz/src/bin/refund_deser_target.rs
+./fuzz/src/bin/router_target.rs
+./fuzz/src/bin/zbase32_target.rs
+./fuzz/src/chanmon_consistency.rs
+./fuzz/src/chanmon_deser.rs
+./fuzz/src/fromstr_to_netaddress.rs
+./fuzz/src/full_stack.rs
+./fuzz/src/indexedmap.rs
+./fuzz/src/invoice_deser.rs
+./fuzz/src/invoice_request_deser.rs
+./fuzz/src/lib.rs
+./fuzz/src/msg_targets/mod.rs
+./fuzz/src/msg_targets/msg_accept_channel.rs
+./fuzz/src/msg_targets/msg_accept_channel_v2.rs
+./fuzz/src/msg_targets/msg_announcement_signatures.rs
+./fuzz/src/msg_targets/msg_channel_announcement.rs
+./fuzz/src/msg_targets/msg_channel_details.rs
+./fuzz/src/msg_targets/msg_channel_ready.rs
+./fuzz/src/msg_targets/msg_channel_reestablish.rs
+./fuzz/src/msg_targets/msg_channel_update.rs
+./fuzz/src/msg_targets/msg_closing_signed.rs
+./fuzz/src/msg_targets/msg_commitment_signed.rs
+./fuzz/src/msg_targets/msg_decoded_onion_error_packet.rs
+./fuzz/src/msg_targets/msg_error_message.rs
+./fuzz/src/msg_targets/msg_funding_created.rs
+./fuzz/src/msg_targets/msg_funding_signed.rs
+./fuzz/src/msg_targets/msg_gossip_timestamp_filter.rs
+./fuzz/src/msg_targets/msg_init.rs
+./fuzz/src/msg_targets/msg_node_announcement.rs
+./fuzz/src/msg_targets/msg_open_channel.rs
+./fuzz/src/msg_targets/msg_open_channel_v2.rs
+./fuzz/src/msg_targets/msg_ping.rs
+./fuzz/src/msg_targets/msg_pong.rs
+./fuzz/src/msg_targets/msg_query_channel_range.rs
+./fuzz/src/msg_targets/msg_query_short_channel_ids.rs
+./fuzz/src/msg_targets/msg_reply_channel_range.rs
+./fuzz/src/msg_targets/msg_reply_short_channel_ids_end.rs
+./fuzz/src/msg_targets/msg_revoke_and_ack.rs
+./fuzz/src/msg_targets/msg_shutdown.rs
+./fuzz/src/msg_targets/msg_splice.rs
+./fuzz/src/msg_targets/msg_splice_ack.rs
+./fuzz/src/msg_targets/msg_splice_locked.rs
+./fuzz/src/msg_targets/msg_stfu.rs
+./fuzz/src/msg_targets/msg_tx_abort.rs
+./fuzz/src/msg_targets/msg_tx_ack_rbf.rs
+./fuzz/src/msg_targets/msg_tx_add_input.rs
+./fuzz/src/msg_targets/msg_tx_add_output.rs
+./fuzz/src/msg_targets/msg_tx_complete.rs
+./fuzz/src/msg_targets/msg_tx_init_rbf.rs
+./fuzz/src/msg_targets/msg_tx_remove_input.rs
+./fuzz/src/msg_targets/msg_tx_remove_output.rs
+./fuzz/src/msg_targets/msg_tx_signatures.rs
+./fuzz/src/msg_targets/msg_update_add_htlc.rs
+./fuzz/src/msg_targets/msg_update_fail_htlc.rs
+./fuzz/src/msg_targets/msg_update_fail_malformed_htlc.rs
+./fuzz/src/msg_targets/msg_update_fee.rs
+./fuzz/src/msg_targets/msg_update_fulfill_htlc.rs
+./fuzz/src/msg_targets/msg_warning_message.rs
+./fuzz/src/msg_targets/utils.rs
+./fuzz/src/offer_deser.rs
+./fuzz/src/onion_hop_data.rs
+./fuzz/src/onion_message.rs
+./fuzz/src/peer_crypt.rs
+./fuzz/src/process_network_graph.rs
+./fuzz/src/refund_deser.rs
+./fuzz/src/router.rs
+./fuzz/src/utils/mod.rs
+./fuzz/src/utils/test_logger.rs
+./fuzz/src/utils/test_persister.rs
+./fuzz/src/zbase32.rs
+./lightning-background-processor/src/lib.rs
+./lightning-block-sync/src/convert.rs
+./lightning-block-sync/src/gossip.rs
+./lightning-block-sync/src/http.rs
+./lightning-block-sync/src/init.rs
+./lightning-block-sync/src/lib.rs
+./lightning-block-sync/src/poll.rs
+./lightning-block-sync/src/rest.rs
+./lightning-block-sync/src/rpc.rs
+./lightning-block-sync/src/test_utils.rs
+./lightning-block-sync/src/utils.rs
+./lightning-custom-message/src/lib.rs
+./lightning-invoice/fuzz/fuzz_targets/serde_data_part.rs
+./lightning-invoice/src/de.rs
+./lightning-invoice/src/lib.rs
+./lightning-invoice/src/payment.rs
+./lightning-invoice/src/ser.rs
+./lightning-invoice/src/tb.rs
+./lightning-invoice/src/utils.rs
+./lightning-invoice/tests/ser_de.rs
+./lightning-net-tokio/src/lib.rs
+./lightning-persister/src/fs_store.rs
+./lightning-persister/src/lib.rs
+./lightning-persister/src/test_utils.rs
+./lightning-persister/src/utils.rs
+./lightning-rapid-gossip-sync/src/error.rs
+./lightning-rapid-gossip-sync/src/lib.rs
+./lightning-rapid-gossip-sync/src/processing.rs
+./lightning-transaction-sync/src/common.rs
+./lightning-transaction-sync/src/electrum.rs
+./lightning-transaction-sync/src/error.rs
+./lightning-transaction-sync/src/esplora.rs
+./lightning-transaction-sync/src/lib.rs
+./lightning-transaction-sync/tests/integration_tests.rs
+./lightning/src/blinded_path/message.rs
+./lightning/src/blinded_path/mod.rs
+./lightning/src/blinded_path/payment.rs
+./lightning/src/blinded_path/utils.rs
+./lightning/src/chain/chaininterface.rs
+./lightning/src/chain/chainmonitor.rs
+./lightning/src/chain/channelmonitor.rs
+./lightning/src/chain/mod.rs
+./lightning/src/chain/onchaintx.rs
+./lightning/src/chain/package.rs
+./lightning/src/chain/transaction.rs
+./lightning/src/crypto/chacha20.rs
+./lightning/src/crypto/chacha20poly1305rfc.rs
+./lightning/src/crypto/mod.rs
+./lightning/src/crypto/poly1305.rs
+./lightning/src/crypto/streams.rs
+./lightning/src/crypto/utils.rs
+./lightning/src/events/bump_transaction.rs
+./lightning/src/events/mod.rs
+./lightning/src/lib.rs
+./lightning/src/ln/async_signer_tests.rs
+./lightning/src/ln/blinded_payment_tests.rs
+./lightning/src/ln/chan_utils.rs
+./lightning/src/ln/chanmon_update_fail_tests.rs
+./lightning/src/ln/channel.rs
+./lightning/src/ln/channel_id.rs
+./lightning/src/ln/channel_keys.rs
+./lightning/src/ln/channelmanager.rs
+./lightning/src/ln/features.rs
+./lightning/src/ln/functional_test_utils.rs
+./lightning/src/ln/functional_tests.rs
+./lightning/src/ln/inbound_payment.rs
+./lightning/src/ln/mod.rs
+./lightning/src/ln/monitor_tests.rs
+./lightning/src/ln/msgs.rs
+./lightning/src/ln/offers_tests.rs
+./lightning/src/ln/onion_payment.rs
+./lightning/src/ln/onion_route_tests.rs
+./lightning/src/ln/onion_utils.rs
+./lightning/src/ln/outbound_payment.rs
+./lightning/src/ln/payment_tests.rs
+./lightning/src/ln/peer_channel_encryptor.rs
+./lightning/src/ln/peer_handler.rs
+./lightning/src/ln/priv_short_conf_tests.rs
+./lightning/src/ln/reload_tests.rs
+./lightning/src/ln/reorg_tests.rs
+./lightning/src/ln/script.rs
+./lightning/src/ln/shutdown_tests.rs
+./lightning/src/ln/wire.rs
+./lightning/src/offers/invoice.rs
+./lightning/src/offers/invoice_error.rs
+./lightning/src/offers/invoice_request.rs
+./lightning/src/offers/merkle.rs
+./lightning/src/offers/mod.rs
+./lightning/src/offers/offer.rs
+./lightning/src/offers/parse.rs
+./lightning/src/offers/payer.rs
+./lightning/src/offers/refund.rs
+./lightning/src/offers/signer.rs
+./lightning/src/offers/test_utils.rs
+./lightning/src/onion_message/functional_tests.rs
+./lightning/src/onion_message/messenger.rs
+./lightning/src/onion_message/mod.rs
+./lightning/src/onion_message/offers.rs
+./lightning/src/onion_message/packet.rs
+./lightning/src/routing/gossip.rs
+./lightning/src/routing/mod.rs
+./lightning/src/routing/router.rs
+./lightning/src/routing/scoring.rs
+./lightning/src/routing/test_utils.rs
+./lightning/src/routing/utxo.rs
+./lightning/src/sign/ecdsa.rs
+./lightning/src/sign/mod.rs
+./lightning/src/sign/taproot.rs
+./lightning/src/sign/type_resolver.rs
+./lightning/src/sync/debug_sync.rs
+./lightning/src/sync/fairrwlock.rs
+./lightning/src/sync/mod.rs
+./lightning/src/sync/nostd_sync.rs
+./lightning/src/sync/test_lockorder_checks.rs
+./lightning/src/util/atomic_counter.rs
+./lightning/src/util/base32.rs
+./lightning/src/util/byte_utils.rs
+./lightning/src/util/config.rs
+./lightning/src/util/errors.rs
+./lightning/src/util/fuzz_wrappers.rs
+./lightning/src/util/indexed_map.rs
+./lightning/src/util/invoice.rs
+./lightning/src/util/logger.rs
+./lightning/src/util/macro_logger.rs
+./lightning/src/util/message_signing.rs
+./lightning/src/util/mod.rs
+./lightning/src/util/persist.rs
+./lightning/src/util/scid_utils.rs
+./lightning/src/util/ser.rs
+./lightning/src/util/ser_macros.rs
+./lightning/src/util/string.rs
+./lightning/src/util/test_channel_signer.rs
+./lightning/src/util/test_utils.rs
+./lightning/src/util/time.rs
+./lightning/src/util/transaction_utils.rs
+./lightning/src/util/wakers.rs
+./msrv-no-dev-deps-check/src/lib.rs
+./no-std-check/src/lib.rs