build: Add the Go build system.

* guix/build-system/go.scm,
guix/build/go-build-system.scm: New files.
* Makefile.am (MODULES): Add new files.
* doc/guix.texi (Build Systems): Document the go-build-system.

Merge branch 'master' into staging

cuirass: Add 'cuirass-jobs.scm' target to compute the Cuirass jobs.

* build-aux/hydra/evaluate.scm: Support "cuirass" command line option.
* Makefile.am (cuirass-jobs.scm): New target.

import: Add JSON importer.

* doc/guix.texi (Invoking guix import): Document it.
* guix/scripts/import/json.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/scripts/import.scm (importers): Add json importer.

import: Add package->code.

* guix/import/print.scm: New file.
* tests/print.scm: New file.
* Makefile.am (SCM_TESTS): Add new test file.
(MODULES): Add print.scm.

Merge branch 'master' into staging

build: Build (guix import gnome) only when we have Guile-JSON.

* Makefile.am (MODULES): Move guix/import/gnome.scm under "if
HAVE_GUILE_JSON".

upstream: Add new GNOME updater.

Partly fixes <https://bugs.gnu.org/28159>.
Reported by Hartmut Goebel <h.goebel@crazy-compilers.com>.

* guix/import/gnome.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/gnu-maintenance.scm (latest-gnome-release)
(%gnome-updater): Remove.

Merge branch 'master' into staging

build-system: Add 'meson-build-system'.

* Makefile.am (MODULES): Add 'guix/build-system/meson.scm' and
'guix/build/meson-build-system.scm'.
* guix/build-system/meson.scm: New file.
* guix/build/meson-build-system.scm: New file.
* doc/guix.texi (Build Systems): Add 'meson-build-system'.

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

guix system: Add 'search' command.

* guix/scripts/system.scm (resolve-subcommand): New procedure.
(process-command): Handle 'search'.
(guix-system): Likewise.
(show-help): Augment.
* guix/scripts/system/search.scm: New file.
* po/guix/POTFILES.in: Add it.
* Makefile.am (MODULES): Add it.
* guix/ui.scm (%text-width): Export.
* doc/guix.texi (Invoking guix system): Document it.
(Service Types and Services): Mention 'guix system search'.
* tests/guix-system.sh: Test it.

uuid: Move tests to 'tests/uuid.scm'.

* tests/file-systems.scm ("uuid->string", "string->uuid")
("uuid", "uuid, syntax error"): Move to...
* tests/uuid.scm: ... here.  New file.
("uuid, ISO-9660, format preserved"): New test.

Merge branch 'master' into staging

gnu: linux-libre: Update to 4.13.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.13.
(%linux-libre-hash): Update hash.
* gnu/packages/aux-files/linux-libre/4.12-i686.conf,
gnu/packages/aux-files/linux-libre/4.12-x86_64.conf: Delete files.
* gnu/packages/aux-files/linux-libre/4.13-i686.conf,
gnu/packages/aux-files/linux-libre/4.13-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Adjust accordingly.

Merge branch 'master' into staging

Merge branch 'master' into core-updates

maint: Create an ISO9660 installation image in the 'release' target.

* Makefile.am (GUIXSD_IMAGE_BASE): Adapt target file name.
(release): Use file-system-type iso9660.
* doc/guix.texi: Document installation from DVD.

Merge branch 'master' into core-updates

build: Add minify build system.

* guix/build-system/minify.scm: New file.
* guix/build/minify-build-system: New file.
* Makefile.am (MODULES): Add new files.
* doc/guix.texi (Build Systems): Document minify-build-system.

build: Make Guile-Git a hard requirement.

* configure.ac: Error out when (git) is missing.
* doc/guix.texi (Requirements): Mention Guile-Git.
* Makefile.am (MODULES): Add guix/git.scm unconditionally.