Merge branch 'master' into core-updates

Merge branch 'master' into gnome-updates

services: Add connman-service.

* gnu/services/networking.scm (connman-service): New procedure.
(connman-service-type, %connman-activation): New variables.
(connman-shepherd-service): New procedure.
* doc/guix.texi (Networking Services): Document it.

utils: Move combinators to (guix combinators).

* guix/utils.scm (compile-time-value, memoize, fold2)
(fold-tree, fold-tree-leaves): Move to...
* guix/combinators: ... here.  New file.
* tests/utils.scm ("fold2, 1 list", "fold2, 2 lists")
(fold-tree tests): Move to...
* tests/combinators.scm: ... here.  New file.
* Makefile.am (MODULES, SCM_TESTS): Add them.
* gnu/packages.scm, gnu/packages/bootstrap.scm,
gnu/services/herd.scm, guix/build-system/gnu.scm,
guix/build-system/python.scm, guix/derivations.scm,
guix/gnu-maintenance.scm, guix/import/elpa.scm,
guix/scripts/archive.scm, guix/scripts/build.scm,
guix/scripts/graph.scm, guix/scripts/lint.scm,
guix/scripts/size.scm, guix/scripts/substitute.scm,
guix/serialization.scm, guix/store.scm, guix/ui.scm: Adjust imports
accordingly.

services: herd: Move UI handling to 'guix system'.

This makes (gnu services herd) independent of (guix ui).

* gnu/services/herd.scm (&shepherd-error, &service-not-found-error)
(&action-not-found-error, &action-exception-error)
(&unknown-shepherd-error): New error condition types.
(report-action-error): Remove.
(raise-shepherd-error): New procedure.
(display-message): Do not use 'info' and '_'.
(invoke-action): Use 'raise-shepherd-error' instead of
'report-action-error'.  Do not use 'warning'.
(current-services): Do not use 'warning'.
* guix/scripts/system.scm (with-shepherd-error-handling): New macro.
(report-shepherd-error, call-with-service-upgrade-info): New
procedures.
(upgrade-shepherd-services): Use it.

Merge branch 'master' into core-updates

services: Move 'device-mapping-service' to (gnu system mapped-devices).

* gnu/services/base.scm (device-mapping-service-type)
(device-mapping-service): Move to...
* gnu/system/mapped-devices.scm (device-mapping-service-type):
(device-mapping-service): ... here.  New variables.

system: Add (gnu system mapped-devices).

* gnu/system/file-systems.scm (<mapped-device>, <mapped-device-type>):
Move to...
* gnu/system/mapped-devices.scm: ... here.  New file.
* gnu/system.scm, gnu/services/base.scm,
gnu/system/linux-initrd.scm: Use it.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu.scm (%public-modules): Add it.

services: 'console-keymap-service' takes multiple files.

* gnu/services/base.scm (console-keymap-service-type): Type procedure
takes a list of files instead of a single file.
(console-keymap-service): Take 'files' as rest arguments.
* doc/guix.texi (Base Services): Improve documentation of
'console-keymap-service'.

Merge branch 'master' into core-updates

services: nscd: Make respawnable.

* gnu/services/base.scm (nscd-shepherd-service): Remove 'respawn?' field.

services: xorg: Fix ~/.xsession handling.

Fixes a regression introduced in c510cbb4ecb270ca3edf282c6769aa2bfb144822.

* gnu/services/xorg.scm (xinitrc)[builder]: Add missing 'apply' when
XSESSION-FILE exists.

services: postgresql: Use syslog.

Fixes <http://bugs.gnu.org/23064>.
Reported by Danny Milosavljevic <dannym@scratchpost.org>.

* gnu/services/databases.scm (%default-postgres-config): Add
'log_destination' line.
(postgresql-shepherd-service): Add requirement on 'syslogd'.

Merge branch 'security-updates'

Merge branch 'master' into core-updates

services: xorg: Accept session commands with arguments.

Before that, a session command with several items, such as
'gnome-session --disable-acceleration-check', would trigger the fallback
session.

* gnu/services/xorg.scm (xinitrc)[builder]: Accept command lines with
more than one arguments.

gnu: services: Add GNOME and XFCE desktop services.

* gnu/services/desktop.scm (package-direct-input-selector): New
  function.
  (<gnome-desktop-configuration>, gnome-desktop-service-type)
  (<xfce-desktop-configuration>, xfce-desktop-service-type): New
  variables.
  (gnome-desktop-service, xfce-desktop-service): New public variables.

* doc/guix.texi (Desktop Services): Document new variables.

gnu: dbus: Incorporate "dbus-helper-search-path.patch".

* gnu/packages/glib.scm (dbus)[source]: Apply
"dbus-helper-search-path.patch".
(dbus/activation): Remove.
* gnu/services/dbus.scm (<dbus-configuration>)[dbus]: Default to DBUS.
(dbus-service): Likewise.

gnu: eudev: Add dependency on blkid.

* gnu/packages/linux.scm (eudev)[inputs]: Add UTIL-LINUX.
(eudev-with-blkid): Remove.
* gnu/services/base.scm (udev-service): Use EUDEV instead of
EUDEV-WITH-BLKID.
* gnu/system.scm (%base-packages): Likewise.

services: elogind: Rely on D-Bus activation.

Previously elogind was explicitly spawned by the Shepherd.  Now it is
activated by dbus-daemon on demand.

* gnu/packages/freedesktop.scm (elogind)[arguments]: Add
'fix-service-file' phase.
* gnu/services/desktop.scm (elogind-shepherd-service): Remove.
(elogind-dbus-service): New procedure.
(elogind-service-type): Do not extend SHEPHERD-ROOT-SERVICE-TYPE.  Use
'elogind-dbus-service' for DBUS-ROOT-SERVICE-TYPE.