f log on start/end of migration

src/main.rs

@@ -1079,6 +1079,7 @@ async fn start_ldk() {
 	tokio::spawn(sweep::migrate_deprecated_spendable_outputs(
 		ldk_data_dir.clone(),
 		Arc::clone(&keys_manager),
+		Arc::clone(&logger),
 		Arc::clone(&persister),
 		Arc::clone(&output_sweeper),
 	));

src/sweep.rs

@@ -4,11 +4,13 @@ use std::sync::Arc;
 use std::{fs, io};
 
 use lightning::sign::{EntropySource, KeysManager, SpendableOutputDescriptor};
+use lightning::util::logger::Logger;
 use lightning::util::persist::KVStore;
 use lightning::util::ser::{Readable, WithoutLength, Writeable};
 
 use lightning_persister::fs_store::FilesystemStore;
 
+use crate::disk::FilesystemLogger;
 use crate::hex_utils;
 use crate::OutputSweeper;
 
@@ -17,9 +19,10 @@ const DEPRECATED_PENDING_SPENDABLE_OUTPUT_DIR: &'static str = "pending_spendable
 /// We updated to use LDK's OutputSweeper as part of upgrading to LDK 0.0.123, so migrate away from
 /// the old sweep persistence.
 pub(crate) async fn migrate_deprecated_spendable_outputs(
-	ldk_data_dir: String, keys_manager: Arc<KeysManager>, persister: Arc<FilesystemStore>,
-	sweeper: Arc<OutputSweeper>,
+	ldk_data_dir: String, keys_manager: Arc<KeysManager>, logger: Arc<FilesystemLogger>,
+	persister: Arc<FilesystemStore>, sweeper: Arc<OutputSweeper>,
 ) {
+	lightning::log_info!(&*logger, "Beginning migration of deprecated spendable outputs");
 	let pending_spendables_dir =
 		format!("{}/{}", ldk_data_dir, DEPRECATED_PENDING_SPENDABLE_OUTPUT_DIR);
 	let processing_spendables_dir = format!("{}/processing_spendable_outputs", ldk_data_dir);
@@ -82,4 +85,10 @@ pub(crate) async fn migrate_deprecated_spendable_outputs(
 
 	fs::remove_dir_all(&spendables_dir).unwrap();
 	fs::remove_dir_all(&pending_spendables_dir).unwrap();
+
+	lightning::log_info!(
+		&*logger,
+		"Successfully migrated {} deprecated spendable outputs",
+		outputs.len()
+	);
 }