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Using EESSI + direnv to ship a workflow execution environment

This repository gives a trivial example of how one can use the direnv tool together with EESSI to ship the complete execution environment for a Nextflow pipeline (including Nextflow itself) with your repository.

Once EESSI and direnv are in place and configured, running the code is a matter of entering the repository directory and running the workflow:

./hello_plus_version.nf

Caveats

  • You need to have EESSI and direnv available on the system. Soon this will be limited to just having EESSI on the system (once EESSI ships direnv).
    • The repository uses the .envrc file to allow direnv to configure the environment (which it gets from EESSI).
  • You need to have direnv enabled for your shell (e.g., eval "$(direnv hook bash)" for bash). A helper script to install and configure direnv is available (but it is pretty invasive so is hidden) 
    source .install_direnv.sh
  • You need to whitelist the repository directory for direnv (direnv will also tell you this once you are inside the repository directory): 
    direnv allow