Fix "File exists" error on restart

VLAN creation now checks if the VLAN interface already exists.  If so,
no creation attempt is made. The interface is still set to "up" and
configured. This fixes the service falling into a permanent restart loop
if it crashes, potentially enabling network access to the device for
better debugging.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 57bca23..c2862a1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -116,7 +116,9 @@ fn create_vlans(conn: &Connection) -> Result<()> {
         let vlan_id = 10 * (i + 1);
         let vlan_name = format!("eth0.{}", vlan_id);
 
-        conn.link_add_vlan(vlan_name.clone(), "eth0".to_string(), vlan_id as u16)?;
+        if !conn.link_exists(vlan_name.clone())? {
+            conn.link_add_vlan(vlan_name.clone(), "eth0".to_string(), vlan_id as u16)?;
+        }
         conn.link_set(vlan_name.clone(), true)?;
 
         conn.address_flush(vlan_name.clone())?;