feat(fuse,core,cli,gui): move between locations without transferring content

A move request with two absolute paths is resolved against every
location (My files, on-demand and mirror synced folders) and made as a
server-side move_node. The local side is levelled afterwards: mounts
forget and re-list, a mirror folder renames its copy and baseline along
or drops the copy once Drive holds it.

Anything only this disk holds is refused up front: queued ops, open
writes, unsynced or ignored mirror files and symlinks. The GUI Move
dialog gains a top-level list of locations.

crates/pdfs-core/src/control.rs

@@ -339,7 +339,10 @@ pub enum Request {
     /// single path component (no separators). Replies with [`Response::Ok`].
     Rename { path: String, new_name: String },
     /// Move a file or folder into a new parent folder. Both `path` and
-    /// `new_parent` are mountpoint-relative. Replies with [`Response::Ok`].
+    /// `new_parent` are mountpoint-relative, or both absolute local paths; two
+    /// absolute paths may lie in different locations (My files, an on-demand
+    /// or a mirror synced folder), and the move is still made on Proton Drive
+    /// without transferring content. Replies with [`Response::Ok`].
     Move { path: String, new_parent: String },
     /// Trash a file or folder. `path` is mountpoint-relative. Replies with
     /// [`Response::Ok`].

crates/pdfs-core/src/db/sync.rs

@@ -260,6 +260,88 @@ impl Db {
         Ok(())
     }
 
+    /// Drop the baseline rows of `rel_path` and everything under it.
+    ///
+    /// Used when a subtree leaves a mirror folder through a move on Drive: its
+    /// local copy is about to be removed, and rows left behind would read as
+    /// "deleted locally" and trash the moved nodes at their new place.
+    pub fn sync_entries_remove_subtree(&self, folder_id: i64, rel_path: &str) -> Result<()> {
+        let conn = self.conn.lock();
+        conn.execute(
+            "DELETE FROM sync_entry
+              WHERE folder_id = ?1
+                AND (rel_path = ?2 OR substr(rel_path, 1, length(?2) + 1) = ?2 || '/')",
+            params![folder_id, rel_path],
+        )?;
+        Ok(())
+    }
+
+    /// Move the baseline rows of `from_rel` and everything under it to `to_rel`
+    /// in folder `to_folder`, in one transaction.
+    ///
+    /// Used when a move on Drive took a mirror subtree along with its local
+    /// copy: the rows still describe both sides correctly, only under a new
+    /// path, so the next pass on either folder has nothing to do. The two
+    /// folders may be the same one.
+    pub fn sync_entries_move(
+        &self,
+        from_folder: i64,
+        from_rel: &str,
+        to_folder: i64,
+        to_rel: &str,
+    ) -> Result<()> {
+        let mut conn = self.conn.lock();
+        let tx = conn.transaction()?;
+        {
+            let mut select = tx.prepare(
+                "SELECT rel_path, remote_uid, local_mtime, local_size, remote_rev, remote_hash,
+                        local_mtime_ns
+                   FROM sync_entry
+                  WHERE folder_id = ?1
+                    AND (rel_path = ?2 OR substr(rel_path, 1, length(?2) + 1) = ?2 || '/')",
+            )?;
+            let rows = select
+                .query_map(params![from_folder, from_rel], |r| {
+                    Ok(StoredSyncEntry {
+                        rel_path: r.get(0)?,
+                        remote_uid: r.get(1)?,
+                        local_mtime: r.get(2)?,
+                        local_size: r.get(3)?,
+                        remote_rev: r.get(4)?,
+                        remote_hash: r.get(5)?,
+                        local_mtime_ns: r.get(6)?,
+                    })
+                })?
+                .collect::<rusqlite::Result<Vec<_>>>()?;
+            let mut delete =
+                tx.prepare("DELETE FROM sync_entry WHERE folder_id = ?1 AND rel_path = ?2")?;
+            for row in &rows {
+                delete.execute(params![from_folder, row.rel_path])?;
+            }
+            let mut insert = tx.prepare(
+                "INSERT OR REPLACE INTO sync_entry
+                   (folder_id, rel_path, remote_uid, local_mtime, local_size, remote_rev,
+                    remote_hash, local_mtime_ns)
+                 VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
+            )?;
+            for row in rows {
+                let rel = format!("{to_rel}{}", &row.rel_path[from_rel.len()..]);
+                insert.execute(params![
+                    to_folder,
+                    rel,
+                    row.remote_uid,
+                    row.local_mtime,
+                    row.local_size,
+                    row.remote_rev,
+                    row.remote_hash,
+                    row.local_mtime_ns,
+                ])?;
+            }
+        }
+        tx.commit()?;
+        Ok(())
+    }
+
     /// Drop the entire baseline for a folder. Used when flipping ondemand→mirror:
     /// the local tree was evicted, so the old baseline is stale and would make the
     /// next reconcile mistake "locally deleted" for "must re-download". Clearing it

crates/pdfs-core/src/db/tests.rs

@@ -2920,6 +2920,94 @@ fn clearing_a_stale_pending_mode_preserves_the_newer_intent() {
     assert_eq!(db.sync_folder_get(id).unwrap().unwrap().pending_mode, None);
 }
 
+fn baseline_row(rel: &str) -> StoredSyncEntry {
+    StoredSyncEntry {
+        rel_path: rel.into(),
+        remote_uid: Some(format!("vol~{rel}")),
+        local_mtime: 1_700_000_000,
+        local_mtime_ns: Some(1_700_000_000_000_000_001),
+        local_size: 7,
+        remote_rev: Some("1700000000".into()),
+        remote_hash: Some("7".into()),
+    }
+}
+
+#[test]
+fn moving_a_baseline_subtree_takes_its_rows_and_leaves_name_prefixed_siblings() {
+    let db = Db::open_in_memory().unwrap();
+    let from = db.sync_folder_add("/home/me/A", "vol~a", "share").unwrap();
+    let to = db.sync_folder_add("/home/me/B", "vol~b", "share").unwrap();
+    for rel in [
+        "docs",
+        "docs/x.txt",
+        "docs/sub/y.txt",
+        "docsextra.txt",
+        "other",
+    ] {
+        db.sync_entry_upsert(from, &baseline_row(rel)).unwrap();
+    }
+    db.sync_entry_upsert(to, &baseline_row("inbox")).unwrap();
+
+    db.sync_entries_move(from, "docs", to, "inbox/docs")
+        .unwrap();
+
+    let left = db.sync_entries(from).unwrap();
+    let mut left: Vec<_> = left.keys().cloned().collect();
+    left.sort();
+    assert_eq!(left, ["docsextra.txt", "other"]);
+
+    let moved = db.sync_entries(to).unwrap();
+    let mut keys: Vec<_> = moved.keys().cloned().collect();
+    keys.sort();
+    assert_eq!(
+        keys,
+        [
+            "inbox",
+            "inbox/docs",
+            "inbox/docs/sub/y.txt",
+            "inbox/docs/x.txt"
+        ]
+    );
+    // Only the path changes: the row still describes the same node on both sides.
+    assert_eq!(
+        moved["inbox/docs/x.txt"],
+        StoredSyncEntry {
+            rel_path: "inbox/docs/x.txt".into(),
+            ..baseline_row("docs/x.txt")
+        }
+    );
+}
+
+#[test]
+fn moving_a_baseline_subtree_within_one_folder_renames_it() {
+    let db = Db::open_in_memory().unwrap();
+    let folder = db.sync_folder_add("/home/me/A", "vol~a", "share").unwrap();
+    for rel in ["old", "old/f.txt", "new"] {
+        db.sync_entry_upsert(folder, &baseline_row(rel)).unwrap();
+    }
+
+    db.sync_entries_move(folder, "old", folder, "new/old")
+        .unwrap();
+
+    let mut keys: Vec<_> = db.sync_entries(folder).unwrap().into_keys().collect();
+    keys.sort();
+    assert_eq!(keys, ["new", "new/old", "new/old/f.txt"]);
+}
+
+#[test]
+fn removing_a_baseline_subtree_keeps_name_prefixed_siblings() {
+    let db = Db::open_in_memory().unwrap();
+    let folder = db.sync_folder_add("/home/me/A", "vol~a", "share").unwrap();
+    for rel in ["docs", "docs/x.txt", "docsextra.txt"] {
+        db.sync_entry_upsert(folder, &baseline_row(rel)).unwrap();
+    }
+
+    db.sync_entries_remove_subtree(folder, "docs").unwrap();
+
+    let keys: Vec<_> = db.sync_entries(folder).unwrap().into_keys().collect();
+    assert_eq!(keys, ["docsextra.txt"]);
+}
+
 #[test]
 fn mirror_uid_lookup_covers_the_root_and_synced_descendants_only() {
     let db = Db::open_in_memory().unwrap();