mclu: boot: Allow template to specify a minimum disk size.

[mclu.git] / mclu_boot.ml

diff --git a/mclu_boot.ml b/mclu_boot.ml
index 5bf742f..451beb8 100644 (file)
--- a/mclu_boot.ml
+++ b/mclu_boot.ml
@@ -71,6 +71,18 @@ Try `mclu list --templates' to list all known templates.\n" template;
   (* Probe the template for various features. *)
   let template_info = Template.probe ~verbose template_filename in
 
+  (* Check --size is not too small. *)
+  let size =
+    match !size, template_info.Template.minimum_size with
+    | 0L, None -> 0L               (* virt-builder default *)
+    | 0L, Some min_size ->         (* go with template minimum size *)
+      min_size
+    | size, Some min_size when size < min_size ->
+      eprintf "mclu: --size parameter is smaller than the minimum specified by the template (%s).\n"
+        (human_size min_size);
+      exit 1
+    | size, _ -> size in           (* go with user-specified size *)
+
   (* Decide how much RAM we will give the guest.  This affects our
    * choice of node, so do it early.
    *)
@@ -267,7 +279,7 @@ Try: `mclu on %s'\n" hostname hostname;
     fpf "export format=%s\n" (quote format);
     fpf "export name=%s\n" (quote name);
     fpf "export output=%s\n" (quote remote_image);
-    (match !size with
+    (match size with
     | 0L -> ()
     | size -> fpf "export size=%s\n" (quote (sprintf "--size %Ldb" size))
     );