fde: Fix "Failed to load kernel module 'nbd'" when used in docker container

Signed-off-by: Kun Lai <[email protected]>

Author: imlk0

cryptpilot.spec

@@ -1,5 +1,5 @@
 %global debug_package %{nil}
-%define release_num 3
+%define release_num 4
 
 Name: cryptpilot
 Version: 0.2.5
@@ -139,6 +139,9 @@ fi
 
 
 %changelog
+* Wed Jul  2 2025 Kun Lai <[email protected]> - 0.2.5-4
+- Fix "Failed to load kernel module 'nbd'" when used in docker container.
+
 * Mon Jun 30 2025 Kun Lai <[email protected]> - 0.2.5-3
 - cryptpilot-convert: fix occasional "device or resource busy" error when rootfs encryption is enabled
 

src/fs/nbd.rs

@@ -27,6 +27,10 @@ pub struct NbdDevice {
 }
 
 impl NbdDevice {
+    pub fn is_module_loaded() -> bool {
+        Path::new("/dev/nbd0").exists()
+    }
+
     pub async fn modprobe() -> Result<()> {
         tokio::task::spawn_blocking(|| {
             liblmod::modprobe(
@@ -48,7 +52,9 @@ impl NbdDevice {
     }
 
     pub async fn get_avaliable() -> Result<NbdDeviceNumber> {
-        Self::modprobe().await?;
+        if !Self::is_module_loaded() {
+            Self::modprobe().await?;
+        }
 
         for i in 0..=99 {
             let dev = PathBuf::from(format!("/dev/nbd{i}"));