Merge branch 'master' into core-updates

system: Use the CRDA udev rules.

* gnu/services/base.scm (%base-services): Add CRDA to the #:rules of
  'udev-service'.
* gnu/system/install.scm (installation-services): Likewise.

system: Make /dev/kvm 660.

* gnu/services/base.scm (kvm-udev-rule): Change /dev/kvm mode to 0660 as a
  followup to the resolution of <http://bugs.gnu.org/18994>.

Merge branch 'master' into core-updates

Merge branch 'master' into gtk-rebuild

Conflicts:
	gnu/packages/gtk.scm

services: swap: Use 'restart-on-EINTR'.

* gnu/services/base.scm (swap-service)[start, stop]: Use 'restart-on-EINTR'.
* guix/build/syscalls.scm (swapoff): Fix typo in 'throw' arguments.

services: Add console-keymap service.

* gnu/services/base.scm (console-keymap-service): New procedure.
* doc/guix.texi (Base Services): Document it.

Co-authored-by: 宋文武 <iyzsong@gmail.com>

file-systems: Use a second 'mount' call for read-only bind mounts.

* gnu/build/file-systems.scm (MS_REMOUNT): New constant.
  (mount-file-system): Add 'flags' local variable.   When FLAGS has
  MS_BIND & MS_RDONLY, call 'mount' with MS_REMOUNT.
* gnu/services/base.scm (file-system-service) <start>: Likewise.

Merge branch 'master' into core-updates

doc: Add example showing how to customize 'nscd-service'.

* doc/guix.texi (Name Service Switch): Add link to nss-mdns.  Add
  example show how to pass #:name-services to 'nscd-service'.
  (Base Services): Add link from 'nscd-service' to the above.
* gnu/services/base.scm (nscd-service): Update docstring accordingly.

Merge branch 'master' into core-updates

services: syslog-service: Add 'config-file' argument.

* gnu/services/base.scm (syslog-service): Add 'config-file' keyword
argument.
* doc/guix.texi (Base Services): Document it.

Merge branch 'master' into core-updates

services: guix-service: Add service documentation.

* gnu/services/base.scm (guix-service): Add 'documentation' field to the
  service.

Merge branch 'master' into core-updates

services: guix-service: Add 'lsof' and 'lsh' to guix-daemon's $PATH.

* gnu/services/base.scm (guix-service): Add #:lsof and #:lsh parameters.
  [start]: Pass #:environment-variables to 'make-forkexec-constructor'.

Merge branch 'master' into core-updates

services: guix-service: Remove extraneous monadism.

* gnu/services/base.scm (guix-build-accounts): Remove unneeded
  'with-monad'.
  (guix-service): Adjust accordingly.

Merge branch 'master' into core-updates

services: nscd: Make sure /var/db/nscd exists.

* gnu/services/base.scm (nscd-service)[activate]: Make /var/db/nscd.