Hint at usage if called without parameters

svn path=/nixpkgs/trunk/; revision=22159
2010-06-05 21:14:01 +00:00 · 2010-06-05 21:14:01 +00:00 · 5d10c4f9b9
commit 5d10c4f9b9
parent 6c4cb05613
1 changed files with 5 additions and 0 deletions
--- a/pkgs/build-support/upstream-updater/update-upstream-data.sh
+++ b/pkgs/build-support/upstream-updater/update-upstream-data.sh
@ -6,6 +6,11 @@ own_dir="$(cd "$(dirname "$0")"; sh -c pwd)"

 source "$own_dir/snippets.sh"

+[ -z "$1" ] && {
+  echo "Specify main expression filename."
+  exit 1;
+}
+
 main_file="$1"
 main_dir="$(cd "$(dirname "$main_file")" ; sh -c pwd)"
 file_name="$(basename "$main_file")"