vm: Move image creation to (guix build vm); split into several procedures.

* guix/build/vm.scm (read-reference-graph, initialize-partition-table,
  install-grub, populate-store, evaluate-populate-directive,
  reset-timestamps, initialize-hard-disk): New procedures.
* gnu/system/vm.scm (qemu-image): Change 'builder' to a call to
  'initialize-hard-disk'.

vm: 'expression->derivation-in-linux-vm' can import modules in the VM.

* gnu/system/vm.scm (%imported-modules): New procedure.
  (expression->derivation-in-linux-vm): Add #:imported-modules
  parameter; remove #:modules.  Add LOADER, and change BUILDER to load
  it.
  (qemu-image): Remove useless #:modules argument.

vm: Strip import list.

* gnu/system/vm.scm: Strip #:select for (gnu packages base).

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.

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.

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>

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.

vm: Add #:memory-size parameter for 'expression->derivation-in-linux-vm'.

* gnu/system/vm.scm (expression->derivation-in-linux-vm): Add
  #:memory-size parameter, defaulting to 256 (QEMU defaults to 128.)

gnu: linux-initrd: Default initrd has no network mounts.

* gnu/system/linux-initrd.scm (gnu-system-initrd): Add #:mounts
  argument.

vm: 'expression->derivation-in-linux-vm' uses QEMU virtfs/9p.

* gnu/system/vm.scm (expression->derivation-in-linux-vm): Change #:qemu
  to default to QEMU-HEADLESS.  Use "-net nic,model=virtio".  Remove
  "-net user,smb=..." and add "-virtfs" options.  Change default initrd
  to include two 9p mounts.

gnu: qemu: Upgrade to 1.7.1; add virtfs support.

* gnu/packages/qemu.scm (qemu-headless): Upgrade to 1.7.1.
  [source]: Remove 'patches' field.
  [arguments]: Add --enable-virtfs configure flag.
  [inputs]: Add libcap and attr.
* gnu/packages/patches/qemu-make-4.0.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

gnu: lapack: Augment library rpath

* gnu/packages/maths.scm (lapack) [arguments]: New post-installation
  phase to augment the rpath of installed libraries.

gnu: Move help2man package to (gnu packages man) module.

* gnu/packages/man.scm (help2man): New variable.
* gnu/packages/help2man.scm: Delete it.
* gnu/packages/cdrom.scm: Import (gnu packages man).
* gnu/packages/zile.scm: Import (gnu packages man).
* gnu-system.am (GNU_SYSTEM_MODULES): Delete 'gnu/packages/help2man.scm'.

gnu: Add man-db.

* gnu/packages.man.scm (man-db): New variable.