Add Zero-OS customization before CPIO creation

- Add initramfs_finalize_customization() function
- Remove root password for passwordless login (sed -i 's/^root:[^:]*:/root::/' /etc/passwd)
- Update /etc/motd and /etc/issue to Zero-OS branding instead of Alpine
- Called automatically before CPIO creation
- Fixes init script duplication issue (/init vs /sbin/init)
- Correct boot flow: /init → switch_root → /sbin/zinit init (no /sbin/init needed)

scripts/lib/initramfs.sh

@@ -570,6 +570,49 @@ function initramfs_strip_and_upx() {
     log_info "Total initramfs size after optimization: ${total_mb}MB"
 }
 
+# Final initramfs customization before CPIO creation
+function initramfs_finalize_customization() {
+    local initramfs_dir="$1"
+    
+    section_header "Final Zero-OS Customization"
+    
+    # Remove root password for passwordless login
+    log_info "Removing root password for passwordless login"
+    if [[ -f "${initramfs_dir}/etc/passwd" ]]; then
+        safe_execute sed -i 's/^root:[^:]*:/root::/' "${initramfs_dir}/etc/passwd"
+        log_info "✓ Root password removed"
+    else
+        log_warn "/etc/passwd not found, skipping password removal"
+    fi
+    
+    # Update /etc/motd to Zero-OS
+    log_info "Updating /etc/motd to Zero-OS branding"
+    cat > "${initramfs_dir}/etc/motd" << 'EOF'
+
+Welcome to Zero-OS!
+
+This is a minimal operating system designed for decentralized infrastructure.
+Built on Alpine Linux with ThreeFold components.
+
+For more information: https://github.com/threefoldtech/zos
+
+EOF
+    
+    # Update /etc/issue to Zero-OS
+    log_info "Updating /etc/issue to Zero-OS branding"
+    cat > "${initramfs_dir}/etc/issue" << 'EOF'
+Zero-OS \r \m
+Built on \l
+
+EOF
+    
+    # Set proper permissions
+    safe_execute chmod 644 "${initramfs_dir}/etc/motd"
+    safe_execute chmod 644 "${initramfs_dir}/etc/issue"
+    
+    log_info "Zero-OS customization complete"
+}
+
 # Create final initramfs.cpio.xz archive
 function initramfs_create_cpio() {
     local initramfs_dir="$1"
@@ -594,6 +637,9 @@ function initramfs_create_cpio() {
     log_info "Output file: ${output_file}"
     log_info "Compression: ${compression}"
     
+    # Run final Zero-OS customization before creating CPIO
+    initramfs_finalize_customization "$initramfs_dir"
+    
     # Change to initramfs directory for relative paths
     safe_execute cd "$initramfs_dir"
     
@@ -896,5 +942,5 @@ function initramfs_copy_resolved_modules() {
 # Export all functions at the end after they're all defined
 export -f initramfs_setup_zinit initramfs_setup_modules initramfs_resolve_module_dependencies
 export -f initramfs_install_init_script initramfs_copy_components initramfs_create_module_scripts
-export -f initramfs_strip_and_upx initramfs_create_cpio initramfs_validate initramfs_test_archive
-export -f initramfs_copy_resolved_modules
+export -f initramfs_strip_and_upx initramfs_finalize_customization initramfs_create_cpio
+export -f initramfs_validate initramfs_test_archive initramfs_copy_resolved_modules