support/scripts/genimage.sh: show usage when invoked incorrectly

[Peter: use ${0}] Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2017-12-09 22:29:59 +01:00 · 2017-12-09 22:29:59 +01:00 · 6887ad7003
commit 6887ad7003
parent 6bfa6b2a04
1 changed files with 5 additions and 1 deletions
--- a/support/scripts/genimage.sh
+++ b/support/scripts/genimage.sh
@ -1,7 +1,11 @@
 #!/usr/bin/env bash

 die() {
-  echo "Error: $@" >&2
+  cat <<EOF >&2
+Error: $@
+
+Usage: ${0} -c GENIMAGE_CONFIG_FILE
+EOF
  exit 1
 }