create_box.sh in vagrant-libvirt-0.0.27

- old
+ new

@@ -1,11 +1,11 @@
 #!/usr/bin/env bash
 #set -xu
 
 error() {
     local msg="${1}"
-    echo "==> ${msg}"
+    echo "==> ERROR: ${msg}"
     exit 1
 }
 
 usage() {
     echo "Usage: ${0} IMAGE [BOX]"
@@ -68,9 +68,13 @@
     echo "==> Image has backing image, copying image and rebasing ..."
     trap "rm -rf $TMP_DIR" EXIT
     cp "$IMG" "$TMP_IMG"
     rebase "$TMP_IMG"
 else
+    if fuser -s "$IMG"; then
+        error "Image '$IMG_BASENAME' is used by another process"
+    fi
+
     # move the image to get a speed-up and use less space on disk
     trap 'mv "$TMP_IMG" "$IMG"; rm -rf "$TMP_DIR"' EXIT
     mv "$IMG" "$TMP_IMG"
 fi
 