fix: enhance setup script to update cached .deb files for offline installation (fixes #662)

Author: bslatyer

nspawn-container/scripts/0-setup-system.sh

@@ -1,20 +1,31 @@
 #!/bin/bash
 # This script installs systemd-container if it's not installed.
 # Also links any containers from /data/custom/machines to /var/lib/machines.
+# Updates the backup .deb files for offline install.
 
 set -e
 
+# Update the cached .deb files for offline use
+echo "Updating backup dpkg package files..."
+mkdir -p /data/custom/dpkg
+cd /data/custom/dpkg
+apt download systemd-container libnss-mymachines debootstrap arch-test
+
+# Install systemd-container and dependencies, fall back to cached .deb files if online install fails
 if ! dpkg -l systemd-container | grep ii >/dev/null; then
     if ! apt -y install systemd-container debootstrap; then
-        yes | dpkg -i /data/custom/dpkg/*.deb
+        echo "Online install failed, attempting offline install from cached .deb files..."
+        dpkg -i /data/custom/dpkg/*.deb 2>/dev/null || apt-get -f install -y
     fi
 fi
 
+# Link containers from /data/custom/machines to /var/lib/machines
 mkdir -p /var/lib/machines
 for machine in $(ls /data/custom/machines/); do
-	if [ ! -e "/var/lib/machines/$machine" ]; then
-		ln -s "/data/custom/machines/$machine" "/var/lib/machines/"
-		machinectl enable $machine
-		machinectl start $machine
-	fi
+    if [ ! -e "/var/lib/machines/$machine" ]; then
+        ln -s "/data/custom/machines/$machine" "/var/lib/machines/"
+        machinectl enable $machine
+        machinectl start $machine
+    fi
 done
+echo "Setup complete."