Fix exit code of xt-install-image when install method failed (Closes: #534290)

bin/xt-install-image

@@ -576,7 +576,7 @@ sub runCommand
     {
         print "Running command '$cmd' failed.\n";
         print "Aborting\n";
-        exit;
+        exit 127;
     }
 
     #

debian/changelog

@@ -29,6 +29,9 @@ xen-tools (4.2~rc1-1) UNRELEASED; urgency=low
       * ${parm/?/pat[/str]} → echo | sed
       * echo -e → printf
       * read → read dummy
+    - xt-install-image now exits with return value 127 instead of 0 to
+      indicate errors on running the command given in --install-method.
+      (Closes: #534290)
   * Removal of /etc/bash_completion.d/xm from the package since
     bash-completion ships a more elaborate version of that file. (Closes:
     #566683, #550590, LP: #538917, #484098)