guix pack -f squashfs silently ignores symlinks

Let's make a basic Singularity file system containing certificates at

the place many programs expect them to be, i.e. /etc/ssl:

$ guix pack -S /etc/ssl=etc/ssl --format=squashfs bash nss-certs

/gnu/store/mxyc56nsrcgcclvm5qsz5c9fkqwdswpw-bash-nss-certs-squashfs-pack.gz.squashfs

There is no error message concerning the symlink, but it's not recorded

either:

$ guix shell squashfs-tools -- unsquashfs -l /gnu/store/mxyc56nsrcgcclvm5qsz5c9fkqwdswpw-bash-nss-certs-squashfs-pack.gz.squashfs | grep -v /gnu/store

squashfs-root

squashfs-root/.empty

squashfs-root/.empty_1

squashfs-root/.singularity.d

squashfs-root/.singularity.d/actions

squashfs-root/.singularity.d/env

squashfs-root/.singularity.d/env/90-environment.sh

squashfs-root/bin

squashfs-root/dev

squashfs-root/gnu

squashfs-root/gnu/.empty

squashfs-root/home

squashfs-root/proc

squashfs-root/sys

What *does* work is:

$ guix pack -S /etc=etc --format=squashfs bash nss-certs

which makes me suspect that linking /etc/ssl fails because there is no

/etc in the file system, but I don't much about squashfs, so maybe I am

wrong.

Cheers,

Konrad