vm: Factorize input conversion.

* gnu/system/vm.scm (input->name+output): New procedure.
  (expression->derivation-in-linux-vm): Use it for 'input-alist'.
  (qemu-image)[input->name+derivation]: Remove.  Use
  'input->name+output' instead.

vm: Add (guix build vm) module.

* guix/build/vm.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Use it.

gnu: ffmpeg: Upgrade to 2.2.1.

* gnu/packages/video.scm (ffmpeg): Upgrade to 2.2.1.

gnu: qemu: Remove 'qemu-with-multiple-smb-shares' package.

* gnu/packages/qemu.scm (qemu/smb-shares): Remove.
* gnu/packages/patches/qemu-multiple-smb-shares.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

vm: Use QEMU's para-virtualized file system support for all VMs.

* gnu/system/vm.scm (system-qemu-image/shared-store-script): Change
  #:qemu to default to QEMU.  Change INITRD to use a 9p mount for the
  store.  Change command-line to use -virtfs.

doc: Mention 'gcc-toolchain' in README.

* README (Installing Guix from Guix): Use "gcc-toolchain" instead of
  "gcc,binutils,ld-wrapper,glibc".

gnu: util-linux: Enable ddate.

* gnu/packages/linux.scm (util-linux): Add --enable-ddate configure flag.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: qt: Upgrade to 5.2.1.

* gnu/packages/qt.scm (qt): Upgrade to 5.2.1.

daemon: Don't abort when $PATH is undefined.

* nix/nix-daemon/guix-daemon.cc (main): Check whether getenv ("PATH")
  returns NULL before blindly initializing 'search_path'.  Before that
  'guix-daemon' would abort when run in an environment where 'PATH' is
  undefined.

nar: 'restore-file-set' registers the temporary result as a GC root.

* guix/nar.scm (temporary-store-directory): Use 'add-indirect-root', not
  'add-temp-root'.  Reported by Andreas Enge <andreas@enge.fr> at
  <https://lists.gnu.org/archive/html/guix-devel/2014-04/msg00161.html>.

doc: Expect to fix typo.

* doc/guix.texi (Build Systems): "except" it is.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: linux-libre: Add SIS hardware compatibility.

* gnu/packages/linux.scm (linux-libre): Add CONFIG_SATA_SIS=y,
  CONFIG_SIS190=y and CONFIG_DEVPTS_MULTIPLE_INSTANCES=y.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

build: Bump to version 0.7.

* configure.ac: Switch to 0.7.

Update '.po' files.

hydra: Make demo OS smaller.

* build-aux/hydra/demo-os.scm: Replace Emacs with Zile.  Enable
  auto-login as "guest".  This is the configuration used for the Guix
  0.6 VM image.

gnu: linux-initrd: Mount /dev/pts at boot time.

* guix/build/linux-initrd.scm (make-essential-device-nodes): Remove
  'mount' call for /dev/pts.
  (boot-system): Add it here, after 'chroot' call.

gnu: linux-initrd: Better populate /dev.

* guix/build/linux-initrd.scm (make-essential-device-nodes): Make
  /dev/{ptmx,tty} world-writable.  Build additional character devices.

system: Initialize $PATH before starting dmd services.

* gnu/services/dmd.scm (dmd-configuration-file): Call 'setenv' before
  starting services.

gnu: guix: Upgrade to 0.6.

* gnu/packages/package-management.scm (guix): Upgrade to 0.6.
* gnu/services/dmd.scm (dmd-configuration-file): Change /var/nix to
  /var/guix.
* gnu/system/vm.scm (operating-system-default-contents): Likewise.

Update 'NEWS'.