Running that code in PID 1 was fun but it’s not really beneficial and
somewhat risky: risk of blocking, file descriptor leak, inability to
reload Guile-Netlink in shepherd when it’s upgraded, and so on.
This change runs set-up and tear-down as separate processes, which, for
the price of one fork(1), buys us peace of mind.
* gnu/services/base.scm (network-set-up/hurd, network-tear-down/hurd)
(network-tear-down/linux): Use ‘program-file’ instead of ‘scheme-file’.
(network-set-up/linux): Likewise, and remove #:blocking? argument to
‘wait-for-link’.
Change-Id: Ia41479b50eab31ea40c67243fcb1cffe29ac874a
8d649a8d17