contrib/osmo-s1gw.sh: add help

Change-Id: Id6ff9af8b7ec6602b4d8316d9ba499b59a483271
---
M contrib/osmo-s1gw.sh
1 file changed, 19 insertions(+), 1 deletion(-)


git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/66/40766/1

diff --git a/contrib/osmo-s1gw.sh b/contrib/osmo-s1gw.sh
index 385f981..5d3e8dd 100755
--- a/contrib/osmo-s1gw.sh
+++ b/contrib/osmo-s1gw.sh
@@ -19,6 +19,19 @@
 NODE_NAME="${APP_NAME}@$(uname -n)"
 ERL_SHELL="-noshell -noinput"
 
+print_usage() {
+  echo "Usage: $0 [-s] [-r ROOTDIR] [-c CONFIG] [-C COOKIE] [-n NAME@HOST]"
+}
+
+print_help() {
+  echo "  -h    This message"
+  echo "  -s    Enable interactive shell"
+  echo "  -r    Application's root directory (default: ${ROOTDIR})"
+  echo "  -c    Config file path (default: ${CONFIG})"
+  echo "  -C    Erlang node cookie (default: ${COOKIE})"
+  echo "  -n    Erlang node name (default: ${NODE_NAME})"
+}
+
 # Parse command line options, if any
 while getopts "c:C:n:r:s" opt; do
   case "$opt" in
@@ -37,8 +50,13 @@
     s)
       ERL_SHELL="-shell"
       ;;
+    h)
+      print_usage
+      print_help
+      exit 1
+      ;;
     *)
-      echo "Usage: $0 [-s] [-r ROOTDIR] [-c CONFIG] [-C COOKIE] [-n NAME@HOST]"
+      print_usage
       exit 1
       ;;
   esac

