Hi! I’ve pushed these two patches, with an extra comment in the Docker test as you suggested. Ricardo Wurmus skribis: > I think it would be good to separate squashfs-image and singularity > going forward as we discussed earlier, but for now mixing the two is > fine. So I was on the verge of renaming the ‘squashfs’ backend as a first step, but I wasn’t sure about the name—naming is hard! I thought about ‘singularity’, but that could be confused with SIF: https://github.com/sylabs/sif Then I thought about ‘singularity-squashfs’: it’s unambiguous but a bit long. Another option is the status quo since both ‘--help’ and the manual mention Singularity. WDYT? Ludo’.