Recommend setting singularity cache directory

[ewels]

From @ewels on July 12, 2018 7:34

We should instruct people to set NXF_SINGULARITY_CACHEDIR as part of the installation instructions.

Copied from original issue: nf-core/cookiecutter#39

[ewels]

We could also set singularity.cacheDir in the pipeline configs..

[drpatelh]

I think this would be cool. Ill give it a go using the crick.config. if there is some sort of standardised naming convention used locally e.g. rnaseq/1.1/ then this could be replaced by NF variables at run-time to get the correct container.

What if the container hasn't been downloaded locally yet though? i.e. the folder doesn't exist. Just download it 😄

[drpatelh]

Or have a single folder with all of the images for all pipelines?

[ewels]

Don’t need to worry about folder and file names - nextflow handles all that for you from memory. This is purely the base directory that it does it from. It defaults to work/singularity from memory.

[maxulysse]

For reference: https://github.com/nf-core/sarek/blob/dev/scripts/download_image.sh

[ewels]

We could also set singularity.cacheDir in the pipeline configs..

This was done as part of nf-core/tools#832