The software layer of the EESSI project uses EasyBuild, Lmod and archspec.

See also https://www.eessi.io/docs/software_layer .

Wed 11 June 2025

• Code & scripts that are used to build the EESSI software layer have been relocated to a separate repository: EESSI/software-layer-scripts.

• The minimal bot/build.sh script in this repository pulls in the latest main branch of the EESSI/software-layer-scripts repository, symlinks the files in there, and then calls out to the bot/build.sh script located in that separate repository.

• The default branch of this repository has been changed to main (was 2023.06-software.eessi.io), and houses easystack files for all versions of EESSI (not just 2023.06).

For more details, see https://gitlab.com/eessi/support/-/issues/139 .

You can set up your environment by sourcing the init script:

$ source /cvmfs/software.eessi.io/versions/2023.06/init/bash
Found EESSI repo @ /cvmfs/software.eessi.io/versions/2023.06!
Derived subdirectory for software layer: x86_64/intel/haswell
Using x86_64/intel/haswell subdirectory for software layer
Initializing Lmod...
Prepending /cvmfs/software.eessi.io/versions/2023.06/software/x86_64/intel/haswell/modules/all to $MODULEPATH...
Environment set up to use EESSI (2023.06), have fun!
[EESSI 2023.06] $

You need Singularity version 3.7 or newer. Then, simply run

$ ./eessi_container.sh

Once you get presented the prompt Singularity> run the above source command.

If you want to build a package for the software repository, simply add the arguments --access rw, e.g., full command would be

$ ./eessi_container.sh --access rw

Note, not all features/arguments listed via ./eessi_container.sh --help are implemented.

The software in this repository is distributed under the terms of the GNU General Public License v2.0.

See LICENSE for more information.

SPDX-License-Identifier: GPL-2.0-only