Add usage to create-vm

1 files changed, 16 insertions, 0 deletions

diff --git a/create-vm b/create-vm
index ecbd8e7..afe8b71 100755
--- a/create-vm
+++ b/create-vm
@@ -4,6 +4,22 @@
 
 set -eu
 
+
+die()
+{
+    echo "$@" 1>&2
+    exit 1
+}
+
+
+# Check parameters.
+
+if [ "$#" != 2 ]
+then
+    die "Usage: $0 NAME BASE"
+fi
+
+
 # Command line parameters: name of VM and base image (no .img.xz suffix).
 name="$1"
 base="$2"