download: Add --help in the individual download scripts

This doesn't change the existing usage of the scripts:
- For the Coreboot script, before this change, all arguments that were
  passed were considered as board to download the Coreboot source code
  for.

  Here we added the '--help' and '--list-boards' arguments, so it
  should not be an issue as it is extremely unlikely that a board
  would be called '--help' or '--list-boards'.

- All the other scripts don't use any arguments so passing --help
  should not conflict with the existing usage.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/resources/scripts/download/grub b/resources/scripts/download/grub
index 47c75bc1..97bae1ed 100755
--- a/resources/scripts/download/grub
+++ b/resources/scripts/download/grub
@@ -21,6 +21,23 @@
 [ "x${DEBUG+set}" = 'xset' ] && set -v
 set -u -e
 
+usage()
+{
+	progname="./download grub"
+	printf "Usage:\n"
+	printf "\t%s         # %s\n" \
+	       "${progname}" \
+	       "Download GRUB"
+	printf "\t%s --help  # %s\n" \
+	       "${progname}" \
+	       "Prints this help"
+}
+
+if [ $# -ne 0 ] ; then
+	usage
+	exit 0
+fi
+
 # Remove the old version that may still exist
 # ------------------------------------------------------------------------------