Please describe your feature

Currently we have support to create, activate and remove spack environment but not to deactivate environment spack env deactivate. For reference see https://buildtest.readthedocs.io/en/devel/buildspecs/spack.html#spack-environment

We propose to add a new feature to deactivate environment by introducing a keyword deactivate which is a boolean

buildspecs:
  spack_env_deactivate_first:
    type: spack
    executor: generic.local.bash
    description: "deactivate a spack environment first prior to activating it"
    tags: [spack]
    spack:
      root: $HOME/spack
      env:
        deactivate: true
        create:
          dir: $HOME/spack-envs/m4
        activate:
          dir: $HOME/spack-envs/m4
        specs:
          - 'm4'
      install:
        option: ''
    post_cmds: |
      spack find
      rm -rf $HOME/spack-envs/m4

If deactivate: true is set then we should emit spack env deactivate otherwise its not set.

The order of the commands would be the following in this example, so we should see environment created first then we deactivate any active environment and run spack env activate.

spack env create
spack env deactivate
spack env activate

TODO

• Update spack schema to add support for deactivate
• Add implementation of emitting spack env deactivate command in https://github.com/buildtesters/buildtest/blob/devel/buildtest/builders/spack.py. This would be in method generate_script see

  buildtest/buildtest/builders/spack.py

  Line 48 in 58f91fd

  def generate_script(self):

• Add example buildspec to demonstrate this example in https://github.com/buildtesters/buildtest/tree/devel/examples/spack/example
• Add documentation in https://buildtest.readthedocs.io/en/devel/buildspecs/spack.html add this at bottom of file

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