services: cuirass: Add host option.

* gnu/services/cuirass.scm (<cuirass-configuration>): Add host option.
(cuirass-shepherd-service): Pass host option.
* doc/guix.texi (Continuous Integration): Document it.

gnu: Add rsync service.

* doc/guix.texi (Networking Services): Add rsync service documentation.
* gnu/services/rsync.scm (<rsync-configuration>): New file.
* gnu/tests/rsync.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new files.

Signed-off-by: Christopher Baines <mail@cbaines.net>

services: network-manager: Add support for VPN plug-ins.

* gnu/services.scm (directory-union): Export.
* gnu/services/networking.scm (<network-manager-configuration>)[vpn-plugins]:
New field.
(vpn-plugin-directory, network-manager-environment): New procedure.
(network-manager-shepherd-service): Pass #:environment-variables to
'make-forkexec-constructor'.
(network-manager-service-type): Add SESSION-ENVIRONMENT-SERVICE-TYPE
extension.
* doc/guix.texi (Networking Services): Document it.

doc: Mention 'mkfs.fat' for the ESP.

Suggested by Hartmut Goebel <h.goebel@crazy-compilers.com>.

* doc/guix.texi (Preparing for Installation): Mention 'mkfs.fat'.

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.

services: Add a description and location for each service type.

* gnu/services.scm (<service-type>)[description, location]: New field.
* doc/guix.texi (Service Types and Services): Document 'description'.

gnu: cuirrass: Default port to 8081.

* gnu/services/cuirass.scm (<cuirass-configuration>): Default port to 8081.
  Fixes conflict with guix-publish default.
* doc/guix.texi (Continuous Integration): Update.

doc: Fix typo in cuirrass config example.

* doc/guix.texi (Continuous Integration): Add missing quote in example spec.

doc: Use Screen and OpenSSH in the bare-bones example.

* gnu/system/examples/bare-bones.tmpl (packages): Remove TCPDUMP; add
SCREEN and OPENSSH.
* doc/guix.texi (Using the Configuration System): Adjust explanation
accordingly.

substitute: Download from unauthorized sources that provide the right content.

This allows substitutes to be downloaded from unauthorized servers, as
long as they advertise the same hash and references as one of the
authorized servers.

* guix/scripts/substitute.scm (assert-valid-narinfo): Remove.
(valid-narinfo?): Add #:verbose?.  Handle each case of
'signature-case'.
(equivalent-narinfo?): New procedure.
(lookup-narinfos/diverse): Add 'authorized?' parameter and honor it.
[select-hit]: New procedure.
(lookup-narinfo): Add 'authorized?' parameter and pass it.
(process-query): Adjust callers accordingly.
(process-substitution): Remove call to 'assert-valid-narinfo'.  Check
whether 'lookup-narinfo' returns true and call 'leave' if not.
* tests/substitute.scm (%main-substitute-directory)
(%alternate-substitute-directory): New variables.
(call-with-narinfo): Make 'narinfo-directory' a parameter.  Call
'mkdir-p' to create it.  Change unwind handler to check whether
CACHE-DIRECTORY exists before deleting it.
(with-narinfo*): New macro.
("substitute, no signature")
("substitute, invalid hash")
("substitute, unauthorized key"): Change expected error message to "no
valid substitute".
("substitute, unauthorized narinfo comes first")
("substitute, unsigned narinfo comes first")
("substitute, first narinfo is unsigned and has wrong hash")
("substitute, first narinfo is unsigned and has wrong refs")
("substitute, unsigned narinfo comes first")
("substitute, two invalid narinfos"): New tests.
* doc/guix.texi (Substitutes): Explain the new behavior.

doc: Replace upstream-list with upstream-blocks.

This fixes the documentation to match the implementation.

* doc/guix.texi (Web Services): Replace 'upstream-list' with
  'upstream-blocks'.

doc: Replace server-list with server-blocks.

* doc/guix.texi (Web Services): Replace 'server-list' with 'server-blocks'.

Signed-off-by: Christopher Baines <mail@cbaines.net>

doc: Update elogind URL.

* doc/guix.texi (Desktop Services): Update elogind URL.

size: Default to '--sort=self'.

* guix/scripts/size.scm (%default-options): Change default value for
'profile<?.
* doc/guix.texi (Invoking guix size): Adjust accordingly.

services: web: Fix nginx-service-type's ‘file’ procedure.

* gnu/services/web.scm (nginx-activation, nginx-shepherd-service): Replace
references to non-existent ‘config-file’ with ‘file’.
* doc/guix.texi (Web Services): Likewise.

doc: Fix typo in copyright header.

* doc/guix.texi: Move stray ‘@*’ to where it belongs.

services: Add auto-enable? parameter to the bluetooth-service.

* gnu/services/desktop.scm (bluetooth-configuration): New record.
(bluetooth-shepherd-service): Use it.
(bluetooth-directory): New method.
(bluetooth-service-type): Use it to extend the etc-service-type service.
(bluetooth-service): Add `auto-enable?' parameter.
* doc/guix.texi (Desktop Services): Document it.

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

services: '%desktop-services' uses NetworkManager instead of Wicd.

Discussed at
<https://lists.gnu.org/archive/html/guix-devel/2017-08/msg00277.html>.

* gnu/services/desktop.scm (%desktop-services): Remove call to
'wicd-service'.  Add instances of NETWORK-MANAGER-SERVICE-TYPE and
WPA-SUPPLICANT-SERVICE-TYPE.
* doc/guix.texi (Networking Services): Document
'network-manager-service-type' as being part of '%desktop-services'.
(Desktop Services): Replace Wicd with NM.

services: mpd: Remove the mpd-file field.

Since MPD switches user, the pid-file must be in a writable dir.  This
is now always /var/run/mpd/(user)/pid.

* gnu/services/audio.scm (mpd-service-type): Add a activation-service
extension.
(<mpd-configuration>)[pid-file]: Remove.
(mpd-service): Rename to...
(mpd-shepherd-service): ... this.
(mpd-file-name, mpd-service-activation): New procedure.
* doc/guix.texi (Audio Services): Document the changes.

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