branch master updated (7dcf529 -> 4656180)

[guix-commits]

wigust pushed a change to branch master
in repository guix.

    from 7dcf529  arb: Update to 2.18.1.
     new cc339cd  services: base: Export references-file.
     new 4656180  services: nix: Fix sandbox.

The 2 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.


Summary of changes:
 doc/guix.texi                    |  21 +++++++
 gnu/local.mk                     |   1 +
 gnu/services/base.scm            |   2 +
 gnu/services/nix.scm             |  91 +++++++++++++++++----------
 gnu/tests/package-management.scm | 130 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 213 insertions(+), 32 deletions(-)
 create mode 100644 gnu/tests/package-management.scm