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add support to eessi_container.sh for using unionfs overlay tool #9

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@boegel boegel commented Jun 14, 2025

Default behavior is left unchanged.

unionfs looks promising, haven't observed the Permission denied issues we've been seeing when creating overlay with fuse-overlays, but it needs to be battle-tested before we jump ship.

Tested with:

./eessi_container.sh --container docker://ghcr.io/eessi/build-node:debian12 --overlay-tool unionfs --access rw

(see also EESSI/filesystem-layer#226)

@boegel boegel added the enhancement New feature or request label Jun 14, 2025
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Minor suggestions

echo 'source /software-layer/scripts/utils.sh' >> ${test_script}
echo 'source /software-layer/init/eessi_environment_variables' >> ${test_script}
echo 'ls -l /software-layer-scripts/' >> ${test_script}
echo 'sed -i "s/__EESSI_VERSION_DEFAULT__/${{matrix.EESSI_VERSION}}/g" init/eessi_defaults
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actual fix is here, this looks more complicated than it should because of software-layer -> software-layer-scripts rename...

@boegel boegel force-pushed the eessi_container_unionfs branch from 3aaa438 to c9b81ba Compare June 17, 2025 18:53
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