scripts: system: Add support for container network sharing.release_17

This is a port of the functionality in the Guix environment command to the
guix system container command.

This requires additional changes to the operating-system definitions used, in
particular, networking related services may need removing if the host network
is shared.

* guix/scripts/system.scm (system-derivation-for-action): Add
  #:container-shared-network? argument.
  (perform-action): Add #:container-shared-network? argument.
  (show-help): Add "-N, --network" help information.
  (%options): Add network option.
  (process-action): Call perform-action with #:container-shared-network?.
* gnu/system/linux-container.scm (%network-configuration-files): New variable.
  (container-script): Add support for returning a container script that shares
  the host network.
* gnu/system.scm (essential-services): Add #:container-shared-network?
  argument.
  (operating-system-services): Add #:container-shared-network? argument.
  (operating-system-etc-service): Add #:container-shared-network? argument,
  and support for ommiting some configuration if the network is shared.
  (operating-system-activation-script): Add #:container-shared-network?
  argument, and pass this through to the operating-system-services procedure.
  (operating-system-boot-script): Add #:container-shared-network? argument,
  and pass this through to the operating-system-services procedure.
  (operating-system-derivation): Add the #:container-shared-network? argument,
  and pass this through to the operating-system-services procedure.
  (operating-system-profile): Add the #:container-shared-network? argument,
  and pass this through to the operating-system-services procedure.

0 files changed, 0 insertions, 0 deletions