Fix warmup to use VFS cache, dynamic SMB share name, smbd long flags

- warmup: read files through FUSE mount instead of rclone copy to temp
  dir. Files now actually land in rclone VFS SSD cache.
- samba: derive share name from mount point dir name instead of
  hardcoded [nas-photos] (e.g. /mnt/projects → [projects])
- supervisor: use smbd long flags (--foreground, --debug-stdout,
  --no-process-group, --configfile) for compatibility with Samba 4.19

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

warpgate/src/cli/warmup.rs

@@ -1,5 +1,10 @@
 //! `warpgate warmup` — pre-cache a remote directory to local SSD.
+//!
+//! Lists files via `rclone lsf`, then reads each through the FUSE mount
+//! to trigger VFS caching. This ensures files land in the rclone VFS
+//! SSD cache rather than being downloaded to a throwaway temp directory.
 
+use std::io;
 use std::process::Command;
 
 use anyhow::{Context, Result};
@@ -8,38 +13,75 @@ use crate::config::Config;
 use crate::rclone::config as rclone_config;
 
 pub fn run(config: &Config, path: &str, newer_than: Option<&str>) -> Result<()> {
+    let warmup_path = config.mount.point.join(path);
     let remote_src = format!("nas:{}/{}", config.connection.remote_path, path);
-    let local_dest = std::env::temp_dir().join("warpgate-warmup");
 
-    println!("Warming up: {}", remote_src);
+    println!("Warming up: {remote_src}");
+    println!("  via mount: {}", warmup_path.display());
 
-    // Create temp destination for downloaded files
-    std::fs::create_dir_all(&local_dest)
-        .context("Failed to create temp directory for warmup")?;
+    if !warmup_path.exists() {
+        anyhow::bail!(
+            "Path not found on mount: {}. Is the mount running?",
+            warmup_path.display()
+        );
+    }
 
+    // List files on remote (supports --max-age for newer_than filter)
     let mut cmd = Command::new("rclone");
-    cmd.arg("copy")
+    cmd.arg("lsf")
         .arg("--config")
         .arg(rclone_config::RCLONE_CONF_PATH)
-        .arg(&remote_src)
-        .arg(&local_dest)
-        .arg("--no-traverse")
-        .arg("--progress");
+        .arg("--recursive")
+        .arg("--files-only")
+        .arg(&remote_src);
 
     if let Some(age) = newer_than {
         cmd.arg("--max-age").arg(age);
     }
 
-    println!("Downloading from remote NAS...");
-    let status = cmd.status().context("Failed to run rclone copy")?;
-
-    // Clean up temp directory
-    let _ = std::fs::remove_dir_all(&local_dest);
-
-    if status.success() {
-        println!("Warmup complete.");
-        Ok(())
-    } else {
-        anyhow::bail!("rclone copy exited with status {}", status);
+    let output = cmd.output().context("Failed to run rclone lsf")?;
+    if !output.status.success() {
+        anyhow::bail!(
+            "rclone lsf failed: {}",
+            String::from_utf8_lossy(&output.stderr).trim()
+        );
     }
+
+    let file_list = String::from_utf8_lossy(&output.stdout);
+    let files: Vec<&str> = file_list.lines().filter(|l| !l.is_empty()).collect();
+    let total = files.len();
+
+    if total == 0 {
+        println!("No files matched.");
+        return Ok(());
+    }
+
+    println!("Found {total} files to cache.");
+
+    let mut cached = 0usize;
+    let mut errors = 0usize;
+
+    for file in &files {
+        let full_path = warmup_path.join(file);
+        match std::fs::File::open(&full_path) {
+            Ok(mut f) => {
+                // Stream-read through FUSE mount → populates VFS cache
+                if let Err(e) = io::copy(&mut f, &mut io::sink()) {
+                    eprintln!("  Warning: read failed: {file}: {e}");
+                    errors += 1;
+                } else {
+                    cached += 1;
+                    eprint!("\r  Cached {cached}/{total}");
+                }
+            }
+            Err(e) => {
+                eprintln!("  Warning: open failed: {file}: {e}");
+                errors += 1;
+            }
+        }
+    }
+
+    eprintln!();
+    println!("Warmup complete: {cached} cached, {errors} errors.");
+    Ok(())
 }

warpgate/src/services/samba.rs

@@ -41,8 +41,14 @@ pub fn generate(config: &Config) -> Result<String> {
     writeln!(conf, "   disable spoolss = yes")?;
     writeln!(conf)?;
 
-    // [nas-photos] share section
-    writeln!(conf, "[nas-photos]")?;
+    // Share name derived from mount point directory name
+    let share_name = config
+        .mount
+        .point
+        .file_name()
+        .map(|n| n.to_string_lossy())
+        .unwrap_or("warpgate".into());
+    writeln!(conf, "[{share_name}]")?;
     writeln!(conf, "   comment = Warpgate cached NAS share")?;
     writeln!(conf, "   path = {mount_point}")?;
     writeln!(conf, "   browseable = yes")?;

warpgate/src/supervisor.rs

@@ -204,7 +204,8 @@ fn start_and_wait_mount(config: &Config, shutdown: &AtomicBool) -> Result<Child>
 /// Spawn smbd as a foreground child process.
 fn spawn_smbd() -> Result<Child> {
     Command::new("smbd")
-        .args(["-F", "-S", "-N", "-s", samba::SMB_CONF_PATH])
+        .args(["--foreground", "--debug-stdout", "--no-process-group",
+               "--configfile", samba::SMB_CONF_PATH])
         .spawn()
         .context("Failed to spawn smbd")
 }