Rename '/root/etc/dmd' directory and 'do-not-kill' file.

* gnu/services/base.scm (%do-not-kill-file): Rename to
  "/etc/shepherd/do-not-kill".
* gnu/build/linux-boot.scm (mount-root-file-system): Rename
  "/root/etc/dmd" to "/root/etc/shepherd".

Use 'shepherd' instead of 'dmd' as init system.

* gnu/services/dmd.scm (dmd-boot-gexp): Use binary from 'shepherd' package.
  (dmd-root-service-type): Use 'shepherd' package.
  (%default-modules): Use (shepherd service) module.
* gnu/services/base.scm (%root-file-system-dmd-service): Use
  'stop-logging' procedure to close shepherd log.

services: guix: Provide Guix via 'profile-service-type'.

* gnu/services/base.scm (guix-service-type): Extend
PROFILE-SERVICE-TYPE.
* gnu/system.scm (%base-packages): Remove GUIX.

services: dmd: Provide dmd via 'profile-service-type'.

* gnu/services/dmd.scm (dmd-root-service-type): Extend
PROFILE-SERVICE-TYPE.
* gnu/system.scm (%base-packages): Remove dmd.

Merge branch 'master' into core-updates

services: avahi: Export service type.

* gnu/services/avahi.scm: Export 'avahi-service-type'.

Merge branch 'master' into core-updates

file-systems: Add a 'mount?' field.

Fixes <http://bugs.gnu.org/22176>.
Reported by Florian Paul Schmidt <mista.tapas@gmx.net>.

* gnu/system/file-systems.scm (<file-system>)[mount?]: New field.
(file-system->spec): Adjust accordingly.
* gnu/services/base.scm (file-system-dmd-service): Return the empty list
when FILE-SYSTEM has 'mount?' set to false.
(user-processes-service): Select the subset of FILE-SYSTEMS that matches
'file-system-mount?'.
* doc/guix.texi (File Systems): Document it.

services: Add 'fstab-service-type'.

* gnu/services/base.scm (file-system->fstab-entry)
(file-systems->fstab): New procedures.
(fstab-service-type): New variable.
* gnu/services/base.scm (file-system-dmd-service): New procedure, taken
from...
(file-system-service-type): ... here.
* gnu/system.scm (essential-services): Add FSTAB-SERVICE-TYPE instance.

gnu: Add dovecot service

* gnu/services/mail.scm: New file.
(&dovecot-configuration-error, dovecot-configuration-error?)
(dovecot-service, dovecot-configuration, dict-configuration)
(passdb-configuration, userdb-configuration)
(unix-listener-configuration, fifo-listener-configuration)
(inet-listener-configuration, service-configuration)
(protocol-configuration, plugin-configuration, mailbox-configuration)
(namespace-configuration, opaque-dovecot-configuration): New public
variables.

* gnu-system.am (GNU_SYSTEM_MODULES): Add (gnu services mail).

* doc/guix.texi (Mail Services): New node.

Merge branch 'master' into core-updates

services: Add 'session-environment-service'.

* gnu/services/base.scm (session-environment-service): New procedure.
(session-environment-service-type): New variable.
(environment-variables->environment-file): New procedure.

services: Add pkexec to setuid programs.

* gnu/services/desktop.scm (polkit-setuid-programs): Add pkexec to
  list of setuid programs.

services: tor: Store private data under /var/lib/tor.

* gnu/services/networking.scm (tor-configuration->torrc): Add
'DataDirectory' clause.  Change 'HiddenServiceDir' to
/var/lib/tor/hidden-services/NAME.
(tor-hidden-service-activation): Create /var/lib/tor.
(tor-hidden-service): Adjust docstring.
* doc/guix.texi (Networking Services): Adjust accordingly.

services: tor: Write to syslog.

* gnu/services/networking.scm (tor-configuration->torrc): Add "Log
notice syslog".
(tor-dmd-service): Add 'syslogd' to 'requirement'.

services: Add 'tor-hidden-service'.

* gnu/services/networking.scm (<tor-configuration>, <hidden-service>):
New record types.
(tor-configuration->torrc): New procedure.
(tor-dmd-service): Use it.
(tor-hidden-service-activation): New procedure.
(tor-service-type)[extensions]: Extend ACTIVATION-SERVICE-TYPE.
[compose, extend]: New fields.
(tor-service): Use 'tor-configuration'.
(tor-hidden-service-type): New variable.
(tor-hidden-service): New procedure.

services: lsh: Correctly handle #:interfaces option.

* gnu/services/ssh.scm (lsh-dmd-service)[lsh-command]: Pass a series of
--interface flags instead of the nonexistent --interfaces option.

services: Add network-manager-service.

* gnu/services/networking.scm (network-manager-service): New procedure.
(network-manager-service-type, %network-manager-activation): New variables.
(network-manager-dmd-service): New procedure.

services: xorg: Export additional symbols.

'slim-configuration' and 'slim-service-type' are needed if one wishes to
use 'modify-services' on a service list that includes the slim service.

* gnu/services/xorg.scm: Export 'slim-configuration' and
  'slim-service-type'.

services: dmd: Spawn a REPL upon failure to load a service definition.

Fixes <http://bugs.gnu.org/19779>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/services/dmd.scm (dmd-configuration-file)[config]: Wrap
'primitive-load' calls in 'call-with-error-handling'.