Fix: ensure disk is unmounted before partitioning and use sudo for reboot

iridium_installer/backend/disk.py

@@ -97,6 +97,37 @@ def get_disk_size(disk_device):
         return 0
 
 
+def ensure_unmounted(disk_device):
+    """
+    Finds all mounted partitions belonging to disk_device and unmounts them.
+    """
+    logger.info(f"Ensuring all partitions on {disk_device} are unmounted...")
+    try:
+        # Get all partitions for this disk from lsblk
+        res = run_command(["lsblk", "-nlo", "NAME,MOUNTPOINT", disk_device])
+        for line in res.stdout.splitlines():
+            parts = line.split()
+            if len(parts) >= 2:
+                # NAME is usually the leaf name (e.g. vda1), we need full path
+                # But lsblk -lp gives full paths
+                pass
+        
+        # Simpler approach: findmnt or just look at /proc/mounts
+        # Let's use lsblk -lp to get full paths
+        res = run_command(["lsblk", "-lpno", "NAME,MOUNTPOINT", disk_device])
+        for line in res.stdout.splitlines():
+            # line looks like "/dev/vda1 /mnt/boot" or "/dev/vda1"
+            parts = line.split()
+            if len(parts) >= 2:
+                dev_path = parts[0]
+                mount_point = parts[1]
+                if mount_point and mount_point != "None":
+                    logger.info(f"Unmounting {dev_path} from {mount_point}...")
+                    run_command(["umount", "-l", dev_path])
+    except Exception as e:
+        logger.warning(f"Error during pre-partition unmount: {e}")
+
+
 def auto_partition_disk(disk_device):
     """
     Automatically partitions the disk:
@@ -109,6 +140,9 @@ def auto_partition_disk(disk_device):
     logger.info(f"Starting auto-partitioning on {disk_device}")
     log_disk_operation("PARTITION", "start", f"Disk: {disk_device}")
 
+    # 0. Ensure unmounted
+    ensure_unmounted(disk_device)
+
     # Calculate sizes
     disk_size = get_disk_size(disk_device)
     ram_size = get_total_memory()

iridium_installer/ui/window.py

@@ -247,7 +247,8 @@ class InstallerWindow(Adw.ApplicationWindow):
             def on_restart(b):
                 import subprocess
                 try:
-                    subprocess.run(["systemctl", "reboot"])
+                    # Use sudo since we might be running as liveuser
+                    subprocess.run(["sudo", "systemctl", "reboot"])
                 except Exception as e:
                     print(f"Failed to reboot: {e}")
                     self.close()