gnu: Add pciutils.

* gnu/packages/pciutils.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu: Add numactl.

* gnu/packages/linux.scm (numactl): New variable.

gnu: openmpi: Fix typo in download uri

* gnu/packages/mpi.scm (openmpi)[origin]: Fix typo.

gnu: fftw: Add dependency on openmpi.

* gnu/packages/algebra.scm (fftw)[inputs,arguments]: Add OpenMPI.

gnu: fftw: Upgrade to 3.3.4

* gnu/packages/algebra.scm (fftw): Upgrade to 3.3.4.

services: Add service to cleanly unmount the root file system.

* gnu/services/base.scm (root-file-system-service,
  user-processes-service): New procedures.
  (mingetty-service, nscd-service, syslog-service, guix-service): Add
  requirement on 'user-processes'.
  (%base-services): Add (user-processes-service)
  and (root-file-system-service).
* gnu/services/xorg.scm (slim-service): Add requirement on
  'user-processes'.

linux-initrd: Don't leak /dev/console file descriptors.

* guix/build/linux-initrd.scm (switch-root): Simplify /dev/console
  code.  This fixes a bug where we would leak the IN and OUT file
  descriptors.

doc: Mention Kiselyov's work on "staging".

* doc/guix.texi (G-Expressions): Mention Oleg's work on "staging" in
  footnote.

git-download: Disable TLS certificate verification.

* guix/build/git.scm (git-fetch): Add 'setenv' call.

gnu: openmpi: Avoid "open source" verbiage

* gnu/packages/mpi.scm (openmpi)[synopsis,description]: Remove mention
  of "open source".

gnu: Add petsc-openmpi.

* gnu/packages/maths.scm (petsc-openmpi): New variable.
  (petsc-complex-openmpi): New variable.

gnu: petsc: Clean some more leaked chroot references

* gnu/packages/maths.scm (petsc)[arguments]: Scrub some
  config-generated header files before build.  Only remove files if
  they exist.

gnu: Add OpenMPI

* gnu/packages/mpi.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

Change 'nix-upstream' submodule URL.

* .gitmodules: Use https, not http.  Reported by
  Pjotr Prins <pjotr.public12@thebird.nl>.

linux-initrd: Update /etc/mtab.

* guix/build/linux-initrd.scm (mount-root-file-system): Populate
  /root/etc/mtab.
  (mount-file-system): Update ROOT/etc/mtab.

Remove now unneeded (guix build gnome) module.

* guix/build/gnome.scm: Remove.
* Makefile.am (MODULES): Update accordingly.

gnu: Make $XDG_DATA_DIRS a search path variable for GLib.

* gnu/packages/glib.scm (glib): Add 'native-search-paths' and
  'search-paths' fields.
* gnu/packages/gnome.scm (libpeas): Remove 'arguments' field.
  (librsvg)[arguments]: Remove #:modules and #:imported-modules.
  Remove settings of INTROSPECTION_SCANNER_ARGS and
  INTROSPECTION_COMPILER_ARGS in makefiles.
* gnu/packages/gtk.scm (gtk+): Likewise.

gnu: gobject-introspection is usually meant to be a native input.

* gnu/packages/gtk.scm (atk, pango, gdk-pixbuf, gtk+): Move
  gobject-introspection to 'native-inputs' since it's only used at build
  time.
* gnu/packages/gnome.scm (libpeas): Move pkg-config,
  gobject-introspection, and intltool to 'native-inputs'.

gnu: Add librsvg.

* gnu/packages/gnome.scm (librsvg): New variable.

linux-initrd: Delete files from the initrd ramfs when switching roots.

* guix/build/linux-initrd.scm (switch-root): Delete file from the old
  root.  Chdir to / after 'chroot' call.  Re-open file descriptors 0, 1,
  and 2.
  (boot-system): Move 'loading' message after the 'switch-root' call.
* gnu/system.scm (operating-system-boot-script): Add loop that closes
  file descriptor before calling 'execl'.