Improve storage handling and VM customization

- Replace NFS with rsync for host-to-guest filesharing
- Switch to qcow2 sparse files, enabling thin provisioning
- Configure serial numbers to improve file device identification
- Support custom provisioning through optional override scripts
- Fix .gitignore

.gitignore

@@ -1 +1 @@
-.vagrant
+.vagrant*

Vagrantfile

@@ -9,14 +9,20 @@ if File.exist?(settings_path)
   settings = YAML.load_file(settings_path)
 end
 
+VAGRANT_NAME = settings['VAGRANT_NAME'] || 'zfstest'
 VAGRANT_BOX  = settings['VAGRANT_BOX']  || 'debian/bookworm64'
+VAGRANT_PROV = settings['VAGRANT_PROV'] || true
 VAGRANT_CPUS = settings['VAGRANT_CPUS'] || 4
 VAGRANT_MEM  = settings['VAGRANT_MEM']  || 4096
-NUM_DISKS    = settings['NUM_DISKS']    || 12
-DISK_SIZE    = settings['DISK_SIZE']    || 1024
+VAGRANT_SH   = settings['VAGRANT_SH']   || ''
+NUM_DISKS    = settings['NUM_DISKS']    || 16
+DISK_SIZE    = settings['DISK_SIZE']    || '18T'
 
 Vagrant.configure("2") do |config|
   config.vm.box = VAGRANT_BOX
+  config.vm.hostname = VAGRANT_NAME
+  config.vm.synced_folder ".", "/vagrant", type: "rsync",
+    rsync__exclude: ".git"
 
   config.vm.provider :libvirt do |libvirt|
     libvirt.cpus   = VAGRANT_CPUS
@@ -34,12 +40,15 @@ Vagrant.configure("2") do |config|
       end
 
       libvirt.storage :file, \
-        :size => "#{DISK_SIZE}M", \
-        :type => 'raw', \
-        :device => "vdz#{device_suffix}"
+        :size => "#{DISK_SIZE}", \
+        :type => 'qcow2', \
+        :sparse => true, \
+        :device => "vdz#{device_suffix}", \
+        :serial => "VDZ#{device_suffix.upcase}"
       end
     end
 
+  if VAGRANT_PROV
     config.vm.provision "shell", inline: <<-SHELL
       if [ -f /etc/os-release ]; then
         . /etc/os-release
@@ -69,3 +78,15 @@ Vagrant.configure("2") do |config|
       fi
     SHELL
   end
+
+  if VAGRANT_SH != ''
+    config.vm.provision "shell", inline: <<-SHELL
+      if [ -f /vagrant/scratch/#{VAGRANT_SH} ]; then
+        /bin/bash /vagrant/scratch/#{VAGRANT_SH}
+      else
+        echo "ERROR: /vagrant/scratch/#{VAGRANT_SH} not found"
+        exit 1
+      fi
+    SHELL
+  end
+end