Read REDIS_DATABASE_SCHEME variable from app when setting REDIS_URL

functions

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$(dirname "$0")/config"
+source "$PLUGIN_AVAILABLE_PATH/config/functions"
 
 get_random_ports() {
   local iterations="${1:-1}"
@@ -70,6 +71,7 @@ service_exposed_ports() {
 service_link() {
   local APP="$2"
   local SERVICE="$1"
+  update_plugin_scheme_for_app "$APP"
   local SERVICE_URL=$(service_url "$SERVICE")
   local SERVICE_NAME=$(get_service_name "$SERVICE")
   local SERVICE_ROOT="$PLUGIN_DATA_ROOT/$SERVICE"
@@ -257,6 +259,7 @@ service_stop() {
 service_unlink() {
   local APP="$2"
   local SERVICE="$1"
+  update_plugin_scheme_for_app "$APP"
   local SERVICE_URL=$(service_url "$SERVICE")
   local SERVICE_NAME=$(get_service_name "$SERVICE")
   local EXISTING_CONFIG=$(dokku config "$APP")
@@ -310,6 +313,7 @@ promote() {
   local APP="$2"
   local PLUGIN_DEFAULT_CONFIG_VAR="${PLUGIN_DEFAULT_ALIAS}_URL"
   local EXISTING_CONFIG=$(dokku config "$APP")
+  update_plugin_scheme_for_app "$APP"
   local SERVICE_URL=$(service_url "$SERVICE")
   local CONFIG_VARS=($(echo "$EXISTING_CONFIG" | grep "$SERVICE_URL" | cut -d: -f1)) || true
   local PREVIOUS_DEFAULT_URL=$(get_url_from_config "$EXISTING_CONFIG" "$PLUGIN_DEFAULT_CONFIG_VAR")
@@ -351,3 +355,9 @@ service_linked_apps() {
 
   tr '\n' ' ' < "$LINKS_FILE"
 }
+
+update_plugin_scheme_for_app() {
+  local APP=$1
+  local REDIS_DATABASE_SCHEME=$(config_get $APP REDIS_DATABASE_SCHEME)
+  PLUGIN_SCHEME=${REDIS_DATABASE_SCHEME:-$PLUGIN_SCHEME}
+}