services: avahi: Add Avahi to the system profile.

* gnu/services/avahi.scm (avahi-service-type): Extend
  PROFILE-SERVICE-TYPE.
  (avahi-service): Adjust docstring.
* doc/guix.texi (Networking Services): Adjust accordingly.
* gnu/system/examples/desktop.tmpl (packages): Remove AVAHI.

services: wicd: Add Wicd to the system profile.

* gnu/services/networking.scm (wicd-service-type): Extend
  PROFILE-SERVICE-TYPE.
  (wicd-service): Mention it in docstring.
* doc/guix.texi (Networking Services): Update documentation
  accordingly.
* gnu/system/examples/desktop.tmpl (packages): Remove WICD.

services: Add 'profile-service-type'.

* gnu/services.scm (packages->profile-entry): New procedure.
  (profile-service-type): New variable.
* gnu/system.scm (operating-system-directory-base-entries): Remove
  the "profile" entry.
  (essential-services): Add a PROFILE-SERVICE-TYPE instance.
  (operating-system-profile): Rewrite in terms of 'fold-services'.
* doc/guix.texi (Service Reference): Add 'profile-service-type'.
* doc/images/service-graph.dot: Likewise.

services: Add 'system-service-type'.

* gnu/services.scm (system-derivation): New procedure.
  (system-service-type): New variable.
  (boot-script-entry): New procedure.
  (boot-service-type): Extend SYSTEM-SERVICE-TYPE.
  (etc-entry): New procedure.
  (etc-service-type): Extend SYSTEM-SERVICE-TYPE.
  (fold-services): Change default #:target-type to SYSTEM-SERVICE-TYPE.
* gnu/system.scm (operating-system-directory-base-entries): New procedure.
  (essential-services): Use it.  Add an instance of
  SYSTEM-SERVICE-TYPE.
  (operating-system-boot-script): Pass #:target-type to 'fold-services'.
  (operating-system-derivation): Rewrite in terms of 'fold-services'.
* gnu/system/linux-container.scm (system-container): Remove.
  (container-script): Use 'operating-system-derivation'.
* guix/scripts/system.scm (export-extension-graph): Replace
  BOOT-SERVICE-TYPE by SYSTEM-SERVICE-TYPE.
* doc/images/service-graph.dot: Add 'system' node and edges.
* doc/guix.texi (Service Composition): Mention SYSTEM-SERVICE-TYPE.
  (Service Reference): Document it.  Update 'fold-services'
  documentation.

doc: Fix typos.

* doc/guix.texi (Invoking guix environment): Fix typos.

doc: Fix typo.

* doc/guix.texi (Invoking guix container): Fix typo.

emacs: Enable 'guix-build-log-minor-mode' in shell buffers.

* emacs/guix-build-log.el (guix-build-log-minor-mode-activate): New variable.
  (guix-build-log-minor-mode-activate-maybe): New function.
* emacs/guix-init.el: Add it to 'shell-mode-hook'.
* doc/emacs.texi (Emacs Build Log): Mention it.

scripts: Add 'container' subcommand.

* guix/scripts/container.scm: New file.
* guix/scripts/container/exec.scm: New file.
* po/guix/POTFILES.in: Add them.
* Makefile.am (MODULES): Add them.
* doc/guix.texi (Invoking guix container): New section.

doc: Mention minimum Linux-libre version for containers.

* doc/guix.texi ("invoking guix environment", "invoking guix system"):
  Mention Linux-libre requirements for container features.

doc: Give an example with an encrypted root partition.

* gnu/system/examples/desktop.tmpl: Add 'mapped-devices' field.
  Use it in 'file-systems'.
* doc/guix.texi (System Installation): Suggest encrypted partitions.
  Give an example of a command sequence.

services: Add 'udisks-service'.

* gnu/services/desktop.scm (<udisks-configuration>): New record type.
  (udisks-service-type): New variable.
  (udisks-service): New procedure.
  (%desktop-services): Use it.
* doc/guix.texi (Desktop Services): Document it.

services: 'polkit-service-type' can now be extended.

* gnu/packages/polkit.scm (polkit)[source]: Adjust snippet so that rules
  and actions are looked for under /etc/polkit-1.
* gnu/services/desktop.scm (<polkit-configuration>): New record type.
  (polkit-directory, polkit-etc-files, polkit-setuid-programs): New
  procedures.
  (polkit-service-type)[compose, extend]: New fields.
  (polkit-service): Refine docstring.
  (colord-service-type): Extend POLKIT-SERVICE-TYPE.
  (elogind-configuration-file): Extend POLKIT-SERVICE-TYPE.
* doc/guix.texi (Desktop Services): Update 'polkit-service'
  documentation.

doc: Suggest diffing things with --no-dereference.

* doc/guix.texi (Invoking guix challenge): Add --no-dereference in
  'diff' example.

emacs: Add key bindings for 'guix-build-log-minor-mode'.

* emacs/guix-build-log.el (guix-build-log-mode-map): Move keys to ...
  (guix-build-log-common-map): ...here.  New variable.
  (guix-build-log-minor-mode-map): New variable.
  (guix-build-log-minor-mode): Use it.
* doc/emacs.texi (Emacs Build Log): Document it.

services: 'tor-service' takes a 'config-file' parameter.

* gnu/services/networking.scm (tor-dmd-service): Take a 'config'
  parameter and honor it.
  (tor-service): Take a 'config-file' parameter.  Pass it in the
  service's value.
* doc/guix.texi (Networking Services): Adjust accordingly.

scripts: environment: Allow lists of packages in expressions.

* guix/scripts/environment.scm (options/resolve-packages): Match against
  lists of packages when evaluating expressions.
* tests/guix-environment.sh: Add test.
* doc/guix.texi ("invoking guix environment"): Add docs.

system: Add 'locale-libcs' field.

* gnu/system/locale.scm (localedef-command)[maybe-version-directory]:
  New procedure.
  Use it.
  (locale-directory): Rename to...
  (single-locale-directory): ... this.  Check the version of LIBC to
  determine whether to create a "X.Y" sub-directory or to make it a
  symlink to ".".  Add the version number in the derivation name.
  (locale-directory): New procedure.
  (%default-locale-libcs): New variable.
* gnu/system.scm (<operating-system>)[locale-libcs]: New field.
  (operating-system-locale-directory): Pass it to 'locale-directory'.
* doc/guix.texi (operating-system Reference): Document 'locale-libcs'.
  (Locales)[Locale Data Compatibility Considerations]: New section.

scripts: system: Add 'container' action.

* guix/scripts/system.scm (show-help): Display 'container' action.
  (system-derivation-for-action, guix-system): Add 'container' case.
  (perform-action): Skip GRUB config generation when building a container.
* doc/guix.texi (Invoking guix system): Document it.

Merge branch 'master' into dbus-update

doc: Fix outdated description of the bare-bones example.

Reported by fps on #guix.

* doc/guix.texi (Using the Configuration System): Replace mention of
  Emacs with tcpdump.