debug flag for image building

lib/images/commons/customizeImage.nix

@@ -10,7 +10,8 @@
     install ? [],
     run ? "",
     commands ? "",
-    osType ? "linux"
+    osType ? "linux",
+    debug ? false
   }:
   let
     originalImageName = lib.strings.removeSuffix "-vmix" (lib.strings.removeSuffix ".qcow2" originalImage.name);
@@ -41,6 +42,7 @@
       #export LIBGUESTFS_HV="${qemuWrapperScript}"
 
       ${pkgs.guestfs-tools}/bin/virt-customize \
+        ${lib.optionalString debug "-v"} \
         -a ${resultImg} \
         --smp ${builtins.toString smp} \
         --memsize ${builtins.toString memSize} \
@@ -52,4 +54,4 @@
       mv ${resultImg} $out
     '';
   in
-    pkgs.runCommand customImageName { __noChroot = true; } builderCommand
+    pkgs.runCommand customImageName { __noChroot = true; } builderCommand