Merge branch 'master' into core-updates

More /gnu/store replacements.

* gnu/packages/gcc.scm (gcc-4.7): Change /nix/store in comment.
* gnu/system/vm.scm (operating-system-default-contents):
  Use (%store-prefix) instead of "/nix/store".
* guix/derivations.scm (derivation-path->output-path,
  derivation-path->output-paths): Change to /gnu/store in docstring.

Merge branch 'master' into core-updates

gnu: linux-initrd: Make the pseudo-tty device nodes.

* guix/build/linux-initrd.scm (make-essential-device-nodes): Create
  /dev/ptmx and /dev/pts.
* gnu/system/vm.scm (qemu-image): Umount /fs/dev/pts before /fs.

Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am

gnu: vm: Remove '%demo-operating-system'.

* gnu/system/vm.scm (%demo-operating-system): Remove.
  (system-qemu-image, system-qemu-image/shared-store,
  system-qemu-image/shared-store-script): Adjust accordingly.

gnu: Introduce the (gnu services ...) modules.

* gnu/system/dmd.scm: Remove file.  Move contents to...
* gnu/services.scm, gnu/services/base.scm, gnu/services/dmd.scm,
  gnu/services/networking.scm, gnu/services/xorg.scm: ... here.  New
  files.
* gnu/system.scm, gnu/system/vm.scm: Adjust accordingly.
* guix/scripts/system.scm (%user-module): Likewise.
* doc/guix.texi (Using the Configuration System): Likewise.
  (Defining Services): Likewise.

gnu: Move root's home directory to /root.

* gnu/system.scm (operating-system-derivation): Change root's
  'home-directory' to "/root".
* gnu/system/vm.scm (operating-system-default-contents): Add /root.

gnu: vm: Create all the user directories.

* gnu/system/vm.scm (operating-system-default-contents)[user-directories]:
  New procedure.  Use it to create each user's home and GC root
  directories.

gnu: vm: Add /run/current-system and /bin/sh.

* gnu/system/vm.scm (operating-system-default-contents): Populate
  /run/current-system and create /bin/sh.
* gnu/system.scm (operating-system-profile-derivation,
  operating-system-profile-directory): New procedures.
  (operating-system-derivation): Use it.

gnu: vm: Add support for running a VM that shares its store with the host.

* gnu/system/vm.scm (qemu-image): Check whether GUIX is #f.
  (operating-system-build-gid, operating-system-default-contents): New
  procedures.
  (system-qemu-image): Use 'operating-system-build-gid'.
  (system-qemu-image/shared-store,
  system-qemu-image/shared-store-script): New procedures.
* gnu/system.scm: Add missing exports.

gnu: linux-initrd: Properly distinguish between /dev/sda* and /dev/vda*.

* guix/build/linux-initrd.scm (make-essential-device-nodes): Rename
  devices with major = 8 to /dev/sda*.  Make /dev/vda* devices.
* gnu/system/vm.scm (qemu-image): Change '/dev/vda' to '/dev/sda'.
* gnu/system.scm (operating-system-derivation): Likewise.

gnu: vm: Run QEMU with '-enable-kvm'.

* gnu/system/vm.scm (expression->derivation-in-linux-vm): Pass QEMU
  '-enable-kvm'.

gnu: linux-initrd: Factorize boot code.

* guix/build/linux-initrd.scm (boot-system): New procedure.
* gnu/system/linux-initrd.scm (qemu-initrd): Add keyword parameters
  'guile-modules-in-chroot?' and 'mounts'.  Change builder to simply
  call 'boot-system'.
  (gnu-system-initrd): Change to a simple call to 'qemu-initrd'.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Call
  'qemu-initrd' with #:guile-modules-in-chroot?.

gnu: Lower initrd makers from packages to monadic procedures.

* gnu/packages/linux-initrd.scm: Remove.
* gnu/system/linux-initrd.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Adjust accordingly.
* gnu/system.scm (<operating-system>): Change default 'initrd' value
  to (gnu-system-initrd).
  (operating-system-derivation): Bind 'operating-system-initrd'.  Pass
  'menu-entry' an initrd file name instead of a package.
* gnu/system/grub.scm (grub-configuration-file): Expect 'initrd' to be
  file name.

Merge branch 'master' into core-updates

gnu: Changes references to (gnu packages admin).

* gnu/packages/version-control.scm, gnu/packages/vim.scm,
  gnu/system.scm, gnu/system/dmd.scm, gnu/system/shadow.scm,
  gnu/system/vm.scm: Change references to (gnu packages system) to (gnu
  packages admin).
  This is a followup to commit 4aeea89.

gnu: vm: Increase size of VM image.

* gnu/system/vm.scm (system-qemu-image): Add 'disk-image-size'
  parameter; increase it.

gnu: Honor the operating system's locale and timezone.

* gnu/system.scm (etc-directory): Add 'locale' and 'timezone'
  parameters.  Set 'LC_ALL', 'TZ', and 'TZDIR' in /etc/profile.
  (operating-system-derivation): Adjust call accordingly.
* gnu/system/vm.scm (%demo-operating-system): Change locale to
  'en_US.UTF-8'.  Add TZDATA to 'packages'.

gnu: Allow a plain list of packages in 'operating-system'.

* gnu/system.scm (union): Allow (PACKAGE OUTPUT), (PACKAGE), and
  PACKAGE.
  (<operating-system>)[packages]: Make the default a list of package?
  objects.
* gnu/system/vm.scm (%demo-operating-system): Likewise.  Add a few
  packages.