services: wicd: Create /var/run/wpa_supplicant.

* gnu/services/networking.scm (%wicd-activation): Create
/var/run/wpa_supplicant.

gnu: Add Prosody service.

* gnu/services/messaging.scm: New file.
* gnu/services/configuration.scm: New exported procedures.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add gnu/services/messaging.scm.
* doc/guix.texi (Messaging Services): New section.

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

services: nginx: Make service extensible.

* gnu/services/web.scm (<nginx-configuration>)[server-blocks]: New
field.
(nginx-activation): When CONFIG-FILE is #f, use 'default-nginx-config'.
(nginx-shepherd-service): Likewise.
(nginx-service-type): Add 'compose' and 'extend' fields.
(nginx-service): Change default value of #:server-list to '(), and
default value of #:config-file to #f.
* doc/guix.texi (Web Services): Document it.

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

services: nginx: Fix multiple index and server name.

* gnu/services/web.scm (config-domain-strings, config-index-string): separate
names with a space.

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

services: nginx: Rename "vhost" to "server".

* gnu/services/web.scm (<nginx-vhost-configuration>): Rename to...
(<nginx-server-configuration>): ... this.
* doc/guix.texi (Web Services): Adjust accordingly.

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

services: cuirass: Remove 'cuirass-service' procedure.

* gnu/services/cuirass.scm (<cuirass-configuration>)[specifications]:
Remove default value.
(cuirass-service): Remove.
* doc/guix.texi (Continuous Integration): Adjust accordingly.

services: cuirass: Allow for gexps in specifications.

* gnu/services/cuirass.scm (<cuirass-configuration>)[specifications]:
Change default value to #~'().
(cuirass-shepherd-service): Remove conditional for "--specifications".
Use 'scheme-file' instead of 'plain-file'.  Change file name to
"cuirass-specs.scm".
* doc/guix.texi (Continuous Integration): Change the example to use a
gexp where #:file refers to a file within Cuirass.  Adjust
documentation.

services: Add libmtp's udev rules to '%desktop-services'.

Suggested by Chris Marusich <cmmarusich@gmail.com>.

* gnu/services/desktop.scm (%desktop-services): Add 'mtp' service via
call to 'simple-service'.

gnu: Fix typo in comment.

* gnu/services/sddm.scm: Fix typo.

services: cuirass: Add Cuirass to the system profile.

* gnu/services/cuirass.scm (cuirass-service-type): Extend
PROFILE-SERVICE-TYPE.

services: cuirass: Add 'cuirass' field.

* gnu/services/cuirass.scm (<cuirass-configuration>)[cuirass]: New
field.
(cuirass-shepherd-service): Honor it.
* doc/guix.texi (Continuous Integration): Document it.

services: cuirass: Create the database directory.

* gnu/services/cuirass.scm (cuirass-activation): Create the database
directory for CONFIG.

services: guix: Add 'log-file' configuration option.

* gnu/services/base.scm (<guix-configuration>)[log-file]: New field.
(guix-shepherd-service): Pass #:log-file to 'make-forkexec-constructor'.
* gnu/services/admin.scm (simple-rotation-config): Take a list of
files and join them with commas.
(%default-rotations): Add /var/log/guix-daemon.log.
* doc/guix.texi (Base Services): Document it.

services: guix: Remove dependency on lsh.

* gnu/services/base.scm (<guix-configuration>)[lsh]: Remove.
(guix-shepherd-service): Remove lsh from 'PATH'.
* doc/guix.texi (Base Services): Adjust accordingly.

services: cuirass: Cache defaults to /var/cache/cuirass.

The previous default value depended on the 'HOME' environment variable,
which happened to be unset.  Thus, /.cache was being used.

* gnu/services/cuirass.scm (<cuirass-configuration>)[cache-directory]:
Change default value to "/var/cache/cuirass".
(cuirass-shepherd-service): Always pass "--cache-directory".
(cuirass-activation): New procedure.
(cuirass-service-type): Use it as an extension to
ACTIVATION-SERVICE-TYPE.
* doc/guix.texi (Continuous Integration): Adjust accordingly.

services: cuirass: Honor 'user' and 'group'.

* gnu/services/cuirass.scm (cuirass-shepherd-service): Pass the user and
group of CONFIG to 'make-forkexec-constructor'.

services: cuirass: Add 'log-file' option.

* gnu/services/cuirass.scm (<cuirass-configuration>)[log-file]: New
field.
(cuirass-shepherd-service): Pass it to 'make-forkexec-constructor'.

services: Use 'file-append' in more places.

* gnu/services/avahi.scm (avahi-shepherd-service): Use #$(file-append x y)
instead of (string-append #$x y).
* gnu/services/base.scm (unicode-start)
(console-keymap-service-type, console-font-shepherd-services)
(mingetty-shepherd-service, nscd-shepherd-service)
(hydra-key-authorization, guix-shepherd-service)
(guix-publish-shepherd-service, udev-shepherd-service)
(gpm-shepherd-service, <kmscon-configuration>)
(kmscon-service-type): Likewise.
* gnu/services/shepherd.scm (shepherd-boot-gexp): Likewise.

services: cuirass: Put specifications in the store.

* gnu/services/cuirass.scm (<cuirass-configuration>): Change type of
'specifications' field to an alist to match the documentation example.
(cuirass-shepherd-service): Store the provided specifications in a file.  Use
that file as the "--specification" argument.

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>