edited usage to show variables name

more clear usage for one-time override feature

deploy.sh

@@ -1,18 +1,24 @@
 #/usr/bin/env bash
 set -e
 
-# Check for the source server (with default)
-DEPLOY_SOURCE_FILE="${HOME}/.deploy_source"
-DEPLOY_SOURCE="https://git.bjphoster.com/deployments"
-if [ -f "${DEPLOY_SOURCE_FILE}" ]; then
-  . "${DEPLOY_SOURCE_FILE}"
+# Check if the source server variable has already been set externally
+if [ -z "${DEPLOY_SOURCE}" ]; then
+  # Check for the source server (with default)
+  DEPLOY_SOURCE_FILE="${HOME}/.deploy_source"
+  DEPLOY_SOURCE="https://git.bjphoster.com/deployments"
+  if [ -f "${DEPLOY_SOURCE_FILE}" ]; then
+    . "${DEPLOY_SOURCE_FILE}"
+  fi
 fi
 
-# Check for the deploy position (with default)
-DEPLOY_DESTINATION_FILE="${HOME}/.deploy_destination"
-DEPLOY_DESTINATION="/opt"
-if [ -f "${DEPLOY_DESTINATION_FILE}" ]; then
-  . "${DEPLOY_DESTINATION_FILE}"
+# Check if the deploy position variable has already been set externally
+if [ -z "${DEPLOY_DESTINATION}" ]; then
+  # Check for the deploy position (with default)
+  DEPLOY_DESTINATION_FILE="${HOME}/.deploy_destination"
+  DEPLOY_DESTINATION="/opt"
+  if [ -f "${DEPLOY_DESTINATION_FILE}" ]; then
+    . "${DEPLOY_DESTINATION_FILE}"
+  fi
 fi
 
 # Check if the correct usage is respected
@@ -20,8 +26,8 @@ if [ $# -lt 2 ]; then
   echo "Usage: $0 <service> <service name> [branch/tag]"
   echo
   echo "Current settings:"
-  echo "- Source      · ${DEPLOY_SOURCE}"
-  echo "- Destination · ${DEPLOY_DESTINATION}"
+  echo "- \$DEPLOY_SOURCE      · ${DEPLOY_SOURCE}"
+  echo "- \$DEPLOY_DESTINATION · ${DEPLOY_DESTINATION}"
   exit
 fi