[gnome-boxes] unattended-file: Ensure DISK injection method is supported

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 789600cba888e82407b7e2cbc4d0c3dc54195d21
Author: Lasse Schuirmann <lasse schuirmann gmail com>
Date:   Sun Jul 20 16:20:54 2014 +0200

    unattended-file: Ensure DISK injection method is supported
    
    Prior to this, injection methods were just assumed to be DISK. We should
    check if it actually is supported before using it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=730640

 src/unattended-file.vala |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/unattended-file.vala b/src/unattended-file.vala
index 24f5b22..8b83ebb 100644
--- a/src/unattended-file.vala
+++ b/src/unattended-file.vala
@@ -97,10 +97,17 @@ private class Boxes.UnattendedScriptFile : GLib.Object, Boxes.UnattendedFile {
 
     private File unattended_tmp;
 
-    public UnattendedScriptFile (UnattendedInstaller installer, InstallScript script, string dest_name) {
+    public UnattendedScriptFile (UnattendedInstaller installer,
+                                 InstallScript       script,
+                                 string              dest_name)
+                                 throws GLib.Error {
         this.installer = installer;
         this.script = script;
         this.dest_name = dest_name;
+
+        var injection_methods = script.get_injection_methods ();
+        if (!(InstallScriptInjectionMethod.DISK in injection_methods))
+            throw new GLib.IOError.NOT_SUPPORTED ("No supported injection method available.");
     }
 
     ~UnattendedScriptFile () {