doc: Mention the d3.js backend of 'guix graph'.

* doc/guix.texi (Invoking guix graph): Mention the d3.js backend.

doc: Document 'cargo-build-system'.

* doc/guix.texi (Build Systems): Add 'cargo-build-system'.

import cran: Add "recursive" option.

* guix/scripts/import/cran.scm: (%options): Add "recursive" option.
(guix-import-cran): Handle "recursive" option.
* doc/guix.texi (Invoking guix import): Document it.

doc: Update dot graphs.

* doc/images/bootstrap-packages.dot,
doc/images/coreutils-bag-graph.dot, doc/images/coreutils-graph.dot,
doc/images/shepherd-graph.dot: Regenerate.

doc: "Nar" now means "normalized archive".

* doc/guix.texi (Invoking guix archive): Mention "normalized archive"
and add index entries.

services: postgresql: Add locale to configuration

* gnu/services/databases.scm (<postgresql-configuration>): Add locale
  field.
  (postgresql-shepherd-service): Pass locale to initdb.
  (postgresql-service): Add locale default.

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

services: postgresql: Add port to configuration

* gnu/services/databases.scm (<postgresql-configuration>): Add port
  field.
  (postgresql-shepherd-service): Pass port to postgres.
  (postgresql-service): Add port default.

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

doc: mention cpan updater.

* doc/guix.texi (Invoking guix refresh): Mention cpan updater.

doc: Replace dead Google Code home page for cryptsetup.

* doc/guix.texi (Mapped Devices): Update cryptsetup home page.

graph: Add "list-backend" and "backend" options.

* guix/graph.scm (%graph-backends): New variable.
* guix/scripts/graph.scm (lookup-backend, list-backends): New
procedures.
(%options): Add options for "backend" and "list-backends".
(show-help): Add help texts for "backend" and "list-backend" options.
(%default-options): Add "backend" default.
(guix-graph): Pass backend argument to "export-graph".
* doc/guix.texi (Invoking guix graph): Document the new options.

doc: Fix typo in Submitting Patches section.

* doc/contributing.texi (Submitting Patches): Fix "could could" typo.

Signed-off-by: Leo Famulari <leo@famulari.name>

import: Add updater for rust crates.

* guix/import/crate.scm (crate-package?, latest-release,
  %crate-updater): New variables.
* guix/scripts/refresh.scm (%updaters): Add crate updater.
* doc/guix.texi: Add crate updater to table.

import: Add importer for rust crates.

* guix/import/crate.scm: New file.
* guix/scripts/import/crate.scm: New file.
* guix/scripts/import.scm (importers): Add crate importer.
* tests/crate.scm: New file.
* doc/guix.texi: Add crate importer to table.
* Makefile.am (MODULES, SCM_TESTS): Add files.

services: mysql: Add port to configuration

* gnu/services/databases.scm (<mysql-configuration>): Add port field.
(mysql-configuration-file): Use the port field when creating the
configuration file.
* doc/guix.texi (Database Services): Document it.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

Merge branch 'master' into staging

offload: Allow testing machines that match a regexp.

* guix/scripts/offload.scm (check-machine-availability): Add 'pred'
parameter and honor it.
(guix-offload): for the "test" sub-command, accept an extra 'regexp'
parameter.  Pass a second argument to 'check-machine-availability'.

Merge remote-tracking branch 'origin/master' into staging

doc: Correct example for 'wpa-supplicant-service-type'.

* doc/guix.texi (Networking Services): Change example to use
'wpa-supplicant-service-type'.

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

offload: Make the compression methods configurable.

* guix/scripts/offload.scm (<build-machine>)[compression]
[compression-level]: New fields.
(open-ssh-session): Honor them.
* doc/guix.texi (Daemon Offload Setup): Document them.

guix system: If the new system generation already exists, overwrite it.

Fixes <http://bugs.gnu.org/25100>.

Before that, 'guix system reconfigure' would fail if the next generation
already existed.

* guix/scripts/system.scm (switch-to-system): Use 'switch-symlink'
instead of 'symlink'.
* doc/guix.texi (Using the Configuration System, Invoking guix system):
Document the behavior.

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