Merge branch 'xorg-updates'

gnu: xorg-server: Update to 1.16.2.901, with many security fixes.

Includes fixes for CVE-2014-8091, CVE-2014-8092, CVE-2014-8093, CVE-2014-8094,
CVE-2014-8095, CVE-2014-8096, CVE-2014-8097, CVE-2014-8098, CVE-2014-8099,
CVE-2014-8100, CVE-2014-8101, CVE-2014-8102, and CVE-2014-8103.

See <http://www.x.org/wiki/Development/Security/Advisory-2014-12-09/>

* gnu/packages/xorg.scm (xorg-server): Update to 1.16.2.901.  Move mesa,
  resourceproto, scrnsaverproto, and xf86driproto from inputs to
  propagated-inputs.  Add dri3proto and presentproto to propagated-inputs.
  Add eudev and libxshmfence to inputs.  Add a 'pre-configure' phase instead
  of modifying the 'configure' phase.  Adapt substitution that avoids trying
  to 'mkdir /var' to build system changes.

* gnu/services/xorg.scm (xserver.conf): Add xf86-input-evdev ModulePath line.

gnu: xf86-video-modesetting: Now uses the same libdrm as mesa.

* gnu/packages/xorg.scm (xf86-video-modesetting): Remove a comment stating
  that the libdrm used in this driver is incompatible with the one in mesa,
  because it is no longer true.
* gnu/services/xorg.scm (xserver.conf): Uncomment 'xf86-video-modesetting'
  ModulePath and remove associated comment.

services: xorg: Make SLiM sessions configurable.

* gnu/services/xorg.scm (%default-xsessions): New variable.
  (xsessions-directory): New procedure.
  (slim-service): Add #:sessions and #:auto-login-session parameters.
  [slim.cfg]: Honor #:sessions.
  (xinitrc): Adjust accordingly.

services: static-networking-service: Switch to (guix build syscalls).

* gnu/services/networking.scm (static-networking-service): Remove
  #:inetutils parameter.  Rewrite using 'configure-network-interface'
  and 'set-network-interface-flags'.

services: Make 'nscd-service' configurable; cache hosts/services by default.

Before that, as it was given an empty configuration file, nscd would
actually have all its caches disabled.

* gnu/services/base.scm (<nscd-configuration>, <nscd-cache>): New record
  types.
  (%nscd-default-caches, %nscd-default-configuration): New variables.
  (nscd.conf-file): New procedure.
  (nscd-service): Add 'config' parameter.  Use 'nscd.conf-file', and
  pass its result as the '-f' parameter of nscd.
* doc/guix.texi (Base Services): Update 'nscd-service' documentation
  accordingly.  Document 'nscd-configuration', 'nscd-cache',
  '%nscd-default-configuration', and '%nscd-default-caches'.

services: xorg: Run the window manager from a login shell.

This is a followup to 1d18d87, which fixes <http://bugs.gnu.org/19119>.

* gnu/services/xorg.scm (xinitrc)[builder]: Add 'exec-from-login-shell'
  procedure.  Use it instead of 'execl' when launching XSESSION, WMAKER,
  or RATPOISON.

services: xorg: Add 'xf86-video-sis'.

* gnu/services/xorg.scm (xorg-start-command)[xserver.conf]: Add
  ModulePath for 'xf86-video-sis'.

doc: Add xrefs to the lsh manual.

Suggested by Adam Pribyl <pribyl@lowlevel.cz>.

* gnu/services/ssh.scm (lsh-service): Update docstring with xrefs to
  the lsh manual.  Fix typos.
* doc/guix.texi (Networking Services): Synchronize.

services: xorg: Include ~/.guix-profile/bin to the session's $PATH.

Fixes <http://bugs.gnu.org/19119>.
Reported by David Thompson <dthompson2@worcester.edu>.

* gnu/services/xorg.scm (xinitrc): Augment $PATH to include
  ~/.guix-profile/bin.

services: user-unmount: Change directory to "/" before unmounting.

* gnu/services/base.scm (user-unmount-service): Add 'chdir' call.

services: xorg: Set argv[0] for the window manager.

* gnu/services/xorg.scm (xinitrc): Set argv[0] when invoking ratpoison
  or wmaker.

gnu: Introduce (gnu artwork) module.

* gnu/artwork.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/services/xorg.scm: Use it.
  (%artwork-repository): Remove.
* gnu/system/grub.scm: Use it.
  (%artwork-repository): Remove.

gnu: xorg: Add SLiM theme based on work by Felipe López.

* gnu/services/xorg.scm (%artwork-repository, %default-slim-theme,
  %default-slim-theme-name): New variables.
  (slim-service): Add #:theme and #:theme-name parameters.
  [slim.cfg]: Honor #:theme-name.
  Honor #:theme by setting the "SLIM_THEMESDIR" environment variable.
* doc/guix.texi (X Window): Adjust 'slim-service' documentation
  accordingly.  Document '%default-slim-theme' and
  '%default-slim-theme-name'.

services: xorg: Don't pass "-ac" to X.

This had pretty much no effects given "-nolisten tcp".

* gnu/services/xorg.scm (xorg-start-command): Remove "-ac" option.

services: Add 'auto-start?' field to <service>.

* gnu/services.scm (<service>)[auto-start?]: New field.
* gnu/services/dmd.scm (dmd-configuration-file): Honor it.
* gnu/system/install.scm (cow-store-service): Add 'auto-start?' field.

services: Add 'user-unmount-service' as an essential service.

* gnu/services/base.scm (user-unmount-service): New procedure.
* gnu/system.scm (essential-services): Use it.
* gnu/system/install.scm (cow-store-service): Mention it in comment.

services: udev: Make /dev/kvm 666 as a workaround.

* gnu/services/base.scm (kvm-udev-rule): Change /dev/kvm mode to 666 to
  work around <http://bugs.gnu.org/18994>.

services: xorg: Add argv[0] in X invocation.

* gnu/services/xorg.scm (xorg-start-command): Add missing argv[0] in
  'execl' call.

services: xorg: Allow users to specify a list of resolutions.

* gnu/services/xorg.scm (xorg-start-command): Add #:resolutions
  parameter and 'screen-section' procedure.  Use it.
* doc/guix.texi (X Window): Adjust accordingly.