guix build: Add -L/--load-path as a common option.

* guix/scripts/build.scm (show-build-options-help): Document -L.
  (%standard-build-options): Add -L/--load-path.
* tests/guix-package.sh: Test it.

guix package: Use 'profile-generations'.

* guix/scripts/package.scm (guix-package)[process-actions]: Use
  'profile-generations' instead of the equivalent code.

offload: Use a total order when sorting available machines.

* guix/scripts/offload.scm (machine-less-loaded?, machine-faster?):
  Remove.
  (machine-power-factor): New procedure.
  (machine-less-loaded-or-faster?): Use it.

offload: Try another machine when the "best" machine is overloaded.

* guix/scripts/offload.scm (choose-build-machine): When BEST is
  overloaded, try the other machines.

pull: Rewrite using gexps.

* guix/scripts/pull.scm (unpack): Remove 'store' parameter.  Rewrite
  using 'gexp->derivation'.
  (what-to-build, indirect-root-added, build-and-install): New
  procedures.
  (guix-pull): Use it.

Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am

activation: Honor $GUIX_NEW_SYSTEM for use by 'guix system reconfigure'.

* gnu/build/activation.scm (activate-current-system): Honor
  $GUIX_NEW_SYSTEM by default.
* guix/scripts/system.scm (switch-to-system): Set $GUIX_NEW_SYSTEM
  before loading SCRIPT.

Merge branch 'master' into core-updates

pull: Add a compilation progress report.

* guix/build/pull.scm (report-build-progress): New procedure.
  (p-for-each): Add #:progress parameter.
  [loop]: Keep track of the number of completed processes.  Tail-call
  PROGRESS at each loop iteration.
  (build-guix): Add #:debug-port parameter.  Use it for verbose
  messages.  Change 'tar' flags to 'xf'.  Around 'compile-file' call,
  bind CURRENT-WARNING-PORT to DEBUG-PORT.
* guix/scripts/pull.scm (unpack): Add #:verbose? parameter.
  [builder]: Pass #:debug-port to 'build-guix'.
  (guix-pull): Leave CURRENT-BUILD-OUTPUT-PORT unchanged.  Pass
  #:verbose? to 'unpack'.

Move operating system helpers from (guix build …) to (gnu build …).

* guix/build/activation.scm, guix/build/install.scm,
  guix/build/linux-initrd.scm, guix/build/vm.scm: Move to...
* gnu/build: ... here.
* Makefile.am (MODULES): Remove the above guix/build/ files.
* gnu-system.am (GNU_SYSTEM_MODULES): Add the above gnu/build/ files
  here.
* gnu/services/base.scm, gnu/services/dmd.scm, gnu/system.scm,
  gnu/system/linux-initrd.scm, gnu/system/vm.scm,
  guix/scripts/system.scm: Adjust to the new module names.

guix lint: Remove "guix lint: " prefix from warnings.

This allows editors to parse warnings correctly.

* guix/scripts/lint.scm (emit-warning): Use 'format' instead of
  'warning', to avoid the "guix lint: " prefix in messages.
* tests/lint.scm (call-with-warnings): Indent.

scripts: add guix lint

* guix/scripts/lint.scm: New file. Defines a 'lint' tool for Guix packages.
* tests/lint.scm: New file.
* Makefile.am (MODULES, SCM_TESTS): Add them.
* po/guix/Makevars: Update appropriately.
* po/guix/POTFILES.in: Update appropriately.
* doc/guix.texi: Document "guix lint".

Move specification->package to gnu/packages.scm.

* guix/scripts/build.scm (specification->package): Move from here...
* gnu/packages.scm: ... to here.

guix package: Fix search path lookup when an obsolete version is installed.

Before that, 'guix package --search-paths' would not work if, say,
'foo-0.2' is installed but the distro provides 'foo-0.3'.

* guix/scripts/package.scm (search-path-environment-variables)[manifest-entry->package]:
  Handle the case where 'find-best-packages-by-name' returns '().

offload: Ignore EEXIST when registering a .drv as a GC root.

Fixes <http://bugs.gnu.org/18115>.
Reported by Mark H Weaver <mhw@netris.org>.

* guix/scripts/offload.scm (register-gc-root)[script]: Wrap 'symlink'
  call in "catch 'system-error", and ignore EEXIST errors.

offload: Ignore unreachable machines.

Fixes <http://bugs.gnu.org/18070>.
Reported by Andreas Enge <andreas@enge.fr>.

* guix/scripts/offload.scm (remote-pipe): Augment docstring.
  (machine-load): Return +inf.0 instead of 1 if MACHINE does not respond
  or responds badly.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/base.scm

gnu: Split (gnu packages base), adding (gnu packages commencement).

* gnu/packages/base.scm (gnu-make-boot0, diffutils-boot0,
  findutils-boot0, %boot0-inputs, nix-system->gnu-triplet, boot-triplet,
  binutils-boot0, gcc-boot0, perl-boot0, linux-libre-headers-boot0,
  texinfo-boot0, %boot1-inputs, glibc-final-with-bootstrap-bash,
  cross-gcc-wrapper, static-bash-for-glibc, glibc-final,
  gcc-boot0-wrapped, %boot2-inputs, binutils-final, libstdc++,
  gcc-final, ld-wrapper-boot3, %boot3-inputs, bash-final, %boot4-inputs,
  guile-final, gnu-make-final, ld-wrapper, coreutils-final, grep-final,
  %boot5-inputs, %final-inputs, canonical-package, gcc-toolchain,
  gcc-toolchain-4.8, gcc-toolchain-4.9): Move to...
* gnu/packages/commencement.scm: ... here.  New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* build-aux/check-final-inputs-self-contained.scm: Adjust accordingly.
* gnu/packages/cross-base.scm: Likewise.
* gnu/packages/make-bootstrap.scm: Likewise.
* guix/build-system/cmake.scm (cmake-build): Likewise.
* guix/build-system/gnu.scm (standard-packages, gnu-build,
  gnu-cross-build): Likewise.
* guix/build-system/perl.scm (perl-build): Likewise.
* guix/build-system/python.scm (python-build): Likewise.
* guix/build-system/trivial.scm (guile-for-build): Likewise.
* guix/download.scm (url-fetch): Likewise.
* guix/gexp.scm (default-guile): Likewise.
* guix/git-download.scm (git-fetch): Likewise.
* guix/monads.scm (run-with-store): Likewise.
* guix/packages.scm (default-guile): Likewise.
* guix/scripts/package.scm (guix-package): Likewise.
* guix/scripts/refresh.scm: Likewise.
* guix/svn-download.scm (svn-fetch): Likewise.
* tests/builders.scm (%bootstrap-inputs, %bootstrap-search-paths):
  Likewise.
* tests/packages.scm ("GNU Make, bootstrap"): Likewise.
* tests/guix-package.sh: Likewise.
* gnu/services/base.scm: Use 'canonical-package' instead of xxx-final.
* gnu/services/xorg.scm: Likewise.
* gnu/system/vm.scm: Likewise.
* guix/scripts/pull.scm (guix-pull): Likewise.

Merge branch 'master' into core-updates

profiles: Produce a top-level Info 'dir' file.

Fixes <http://bugs.gnu.org/18305>.
Reported by Brandon Invergo <brandon@gnu.org>.

* guix/profiles.scm (manifest-inputs, info-dir-file): New procedures.
  (profile-derivation): Use them.  Add #:info-dir? parameter and honor
  it.
* guix/scripts/package.scm (guix-package): Call 'profile-derivation'
  with #:info-dir? #f when the 'bootstrap? option is set.
* tests/profiles.scm ("profile-derivation"): Pass #:info-dir? #f.