11626 introduce /etc/versions/build
11627 clean up UUID code for ::status

*** 133,142 ****
--- 133,145 ----
  
  # POST_NIGHTLY can be any command to be run at the end of nightly.  See
  # nightly(1) for interactions between environment variables and this command.
  #POST_NIGHTLY=
  
+ # Populates /etc/versions/build on each nightly run
+ export BUILDVERSION_EXEC="git describe --all --long --dirty"
+ 
  # -----------------------------------------------------------------------------
  # You are less likely to need to modify parameters below.
  # -----------------------------------------------------------------------------
  
  # Maximum number of dmake jobs.  The recommended number is 2 + NCPUS,