I was trying to setup shop on a new supercomputer and since I'm using environments now on my own machine I thought I could just use that. Turns out you need to fetch things from the login node, rather than do that on the compute node...

Had to teach spack fetch to gather its todo list from an environment. Let me know if you want to keep this

• previously: spack fetch required the explicit statement of
  the specs to be fetched, even when in an environment
• now: if there is no spec(s) provided to spack fetch we check
  if an environment is active and if yes we fetch all
  uninstalled specs.