of them might have extra ones. Note that all counts are
zero-based.
+Since Ganeti version 2.5, the environment will be cleaned up before
+being passed to scripts, therefore they will not inherit the environment
+in with which the ganeti node daemon was started. If you depend on any
+environment variables (non-Ganeti), then you will need to define or
+source them appropriately.
+
OS_API_VERSION
The OS API version that the rest of the environment conforms to.