bug#43739: guix archive --export broken on foreign distro

[Lars-Dominik Braun]

Hi,

as discussed on IRC [1][2] `guix archive --export` is currently broken on
foreign distributions. It fails with the error message:

        guix archive: error: corrupt input while restoring archive from 
#<closed: file 7f27c396e150>

strace reveals `guix authenticate` prints a message to stderr, which the
guix-daemon does not expect:

        guile: warning: failed to install locale

Installing the package glibc-locales into root’s user profile (because
guix-daemon.service references that) and restarting the daemon solves the
issue.

See also https://issues.guix.gnu.org/43737

Cheers,
Lars

[1] http://logs.guix.gnu.org/guix/2020-09-29.log#141931
[2] http://logs.guix.gnu.org/guix/2020-09-30.log#113955

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