ensure app name begins with lowercase. closes #1774

plugins/apps/functions

@@ -4,6 +4,7 @@ source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 apps_create() {
   [[ -z $1 ]] && dokku_log_fail "Please specify an app to run the command on"
+  [[ ! "$1" =~ ^[a-z].* && ! "$1" =~ ^[0-9].* ]] && dokku_log_fail "App name must begin with lowercase alphanumeric character"
   [[ -d "$DOKKU_ROOT/$1" ]] && dokku_log_fail "Name is already taken"
   local APP="$1"
 

plugins/common/functions

@@ -121,6 +121,10 @@ dokku_container_log_verbose_quiet() {
 verify_app_name() {
   local APP="$1"
   [[ ! -n "$APP" ]] && dokku_log_fail "(verify_app_name) APP must not be null"
+  if [[ ! "$APP" =~ ^[a-z].* && ! "$APP" =~ ^[0-9].* ]]; then
+    [[ -d "$DOKKU_ROOT/$APP" ]] && rm -rf "$DOKKU_ROOT/$APP"
+    dokku_log_fail "App name must begin with lowercase alphanumeric character"
+  fi
   [[ ! -d "$DOKKU_ROOT/$APP" ]] && dokku_log_fail "App $APP does not exist"
 
   return 0