Fix Cashu file redemption and Bitcoin-dependent wallet readiness

core/archipelago/src/settings/bitcoin_storage.rs

@@ -0,0 +1,51 @@
+//! Install-time pruning preference, shared by Bitcoin Core and Knots.
+//! Missing preference preserves the existing disk-based automatic selection.
+use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+use std::path::Path;
+
+#[derive(Default, Serialize, Deserialize)]
+pub struct BitcoinStorage {
+    pub prune: bool,
+}
+
+pub async fn load(data_dir: &Path) -> Result<BitcoinStorage> {
+    match tokio::fs::read(data_dir.join("settings/bitcoin-storage.json")).await {
+        Ok(bytes) => serde_json::from_slice(&bytes).context("Invalid Bitcoin storage settings"),
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(BitcoinStorage::default()),
+        Err(e) => Err(e.into()),
+    }
+}
+
+pub async fn save(data_dir: &Path, prune: bool) -> Result<()> {
+    let dir = data_dir.join("settings");
+    tokio::fs::create_dir_all(&dir).await?;
+    let path = dir.join("bitcoin-storage.json");
+    let temporary = dir.join("bitcoin-storage.json.tmp");
+    tokio::fs::write(&temporary, serde_json::to_vec(&BitcoinStorage { prune })?).await?;
+    tokio::fs::rename(temporary, path).await?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[tokio::test]
+    async fn missing_setting_keeps_auto_and_explicit_pruning_survives_reload() {
+        let dir = tempfile::tempdir().unwrap();
+        assert!(!load(dir.path()).await.unwrap().prune);
+        save(dir.path(), true).await.unwrap();
+        assert!(load(dir.path()).await.unwrap().prune);
+        save(dir.path(), false).await.unwrap();
+        assert!(!load(dir.path()).await.unwrap().prune);
+    }
+    #[tokio::test]
+    async fn corrupt_setting_is_not_silently_changed_to_archival() {
+        let dir = tempfile::tempdir().unwrap();
+        save(dir.path(), true).await.unwrap();
+        tokio::fs::write(dir.path().join("settings/bitcoin-storage.json"), "broken")
+            .await
+            .unwrap();
+        assert!(load(dir.path()).await.is_err());
+    }
+}

core/archipelago/src/settings/mod.rs

@@ -7,3 +7,5 @@
 pub mod ai_permissions;
 pub mod session_policy;
 pub mod transport;
+
+pub mod bitcoin_storage;