gnu: gmp: Upgrade to 6.0.0a.

* gnu/packages/multiprecision.scm (gmp): Upgrade to 6.0.0a.
* gnu/packages/base.scm (gcc-boot0): Modify symbolic link to point to
    gmp-6.0.0 instead of the non-existing gmp-6.0.0a.

build-system/gnu: Reset timestamps on build tree when source is a directory.

* guix/build/utils.scm (copy-recursively): Add #:keep-mtime? parameter
  and honor it.
* guix/build/gnu-build-system.scm (unpack): Use #:keep-mtime? #t.
* gnu/packages/admin.scm (shadow)[arguments]: Remove 'reset-timestamps'
  phase.

gnu: gcc-final: Add Texinfo as an input.

* gnu/packages/base.scm (gcc-final)[native-inputs]: New field.

gnu: gawk: Upgrade to 4.1.1.

* gnu/packages/gawk.scm (gawk): Upgrade to 4.1.1.

derivations: Fix 'fixed-output-derivation?'.

Reported by Nikita Karetnikov <nikita@karetnikov.org>.

* guix/derivations.scm (fixed-output-derivation?): Fix pattern.
* tests/derivations.scm ("fixed-output-derivation?"): Add test.

gnu: Add Linux man-pages.

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

nar: Really protect the temporary store directory from GC.

Prevents garbage collection of the temporary store directory while
restoring a file set, as it could previously happen:
<https://lists.gnu.org/archive/html/guix-devel/2014-04/msg00167.html>.

* guix/nar.scm (temporary-store-directory): Rename to...
  (temporary-store-file): ... this.  Use 'add-permanent-root' instead of
  'add-indirect-root'.
  (with-temporary-store-file): New macro.
  (restore-one-item): New procedure, with code formerly in
  'restore-file-set'.  Use 'with-temporary-store-file'.
  (restore-file-set): Use it.

store: Add 'add-permanent-root' and 'remove-permanent-root'.

* guix/store.scm (add-indirect-root): Improve docstring.
  (%gc-roots-directory): New variable.
  (add-permanent-root, remove-permanent-root): New procedures.
* tests/store.scm ("permanent root"): New test.

openssh: Add another mirror.

* gnu/packages/ssh.scm (openssh): Add the mirror.

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

packages: Correctly handle patching for inputs with no extension.

Reported by Manolis Ragkousis <manolis837@gmail.com>.

* guix/packages.scm (patch-and-repack)[numeric-extension?]: Handle
  FILE-NAME with no extension.

gnu: Add Mosh.

* gnu/packages/ssh.scm (mosh): New variable.

gnu: Add perl-io-tty.

* gnu/packages/perl.scm (perl-io-tty): New variable.

gnu: Add Protobuf.

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

hydra: Specify the image size of the QEMU image.

* build-aux/hydra/gnu-system.scm (qemu-jobs): Specify
  #:disk-image-size.

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.