Auto-detect compatible permissions method, with possibility to deny acl if needed.

Author: kierenevans

ubuntu/16.04/usr/local/share/bootstrap/common_functions.sh

@@ -346,3 +346,17 @@ function do_list_functions() {
 function do_shell() {
   bash "$@"
 }
+
+function has_acl() {
+  return 0
+}
+
+function permission_mode() {
+  if [ "$IS_CHOWN_FORBIDDEN" == "true" ]; then
+    echo "chmod"
+  elif has_acl; then
+    echo "facl"
+  else
+    echo "stickybit"
+  fi
+}

ubuntu/16.04/usr/local/share/env/50-bootstrap

@@ -34,6 +34,8 @@ export APP_USER_LOCAL
 APP_USER_LOCAL_RANDOM="$(convert_to_boolean_string "${APP_USER_LOCAL_RANDOM:-false}")"
 export APP_USER_LOCAL_RANDOM
 
+export PERMISSION_MODE=${PERMISSION_MODE:="$(permission_mode)"}
+
 export BUILD_USER_SSH_PRIVATE_KEY=${BUILD_USER_SSH_PRIVATE_KEY:-}
 export BUILD_USER_SSH_PUBLIC_KEY=${BUILD_USER_SSH_PUBLIC_KEY:-}
 export BUILD_USER_SSH_KNOWN_HOSTS=${BUILD_USER_SSH_KNOWN_HOSTS:-}