`guix pack --format=squashfs bash-minimal ...` fails on CentOS7 with SELinux disabled.

```
$ /var/guix/profiles/per-user/marshjo/current-guix/bin/guix describe
Generation 9	Mar 12 2020 09:28:29	(current)
  guix a595399
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: a595399230a7b1acb0b096b3d5a7474100014299
```
---

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