* 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.

Fixes <http://bugs.gnu.org/21784>.

* gnu/packages/compression.scm (xz)[source]: Add alternate URL.

This reverts commit 7f39e181.

Polkit actually uses the name "polkit-1" in calls to 'pam_start'.

* gnu/packages/video.scm (youtube-dl)[url]: Change to http.
  [description]: Fix capitalization.

* gnu/packages/video.scm (youtube-dl): Update to 2015.11.01.

* 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.

* gnu/packages/freedesktop.scm (udisks)[outputs]: New field.
  [arguments]: Pass the --with-html-dir configure flag.

* gnu/packages/freedesktop.scm (udisks)[arguments]: Add
  --enable-fhs-media.

* gnu/packages/freedesktop.scm (udisks)[inputs]: Add UTIL-LINUX.
  [arguments]: Add 'set-mount-file-name' phase.

* 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.

* gnu/packages/hurd.scm (hurd-headers): Update to version 0.7.

* gnu/packages/hurd.scm (mig): Update to version 1.6.

* gnu/packages/hurd.scm (gnumach-headers): Update to version 1.6.

* tests/store.scm ("write-file & export-path yield the same result"):
  New test.

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

* src/libstore/build.cc (CHROOT_ENABLED): Remove HAVE_UNSHARE.

* gnu/packages/aarddict.scm: Remove file.
* gnu-system.am (GNU_SYSTEM_MODULES): Unregister file.

* emacs/guix-build-log.el (guix-build-log-mode-hook): Remove
  'compilation-shell-minor-mode' as it is slow on big buffers, and
  'view-mode' as it rebinds too many keys.
  (guix-build-log-mode-map): Add "c" and "v" key bindings for the
  removed minor modes.

* 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.

* guix/scripts/system.scm (show-help): Align 'container' the same way as
  other actions.

* emacs/guix-pcomplete.el (guix-pcomplete-refresh-updaters): New function.
  (guix-pcomplete-complete-option-arg): Complete '-t/--type' option for
  'guix refresh' command.

* 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.

* gnu/packages/patches/guitarix-c++11.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/audio.scm (guitarix)[source]: Use it.
  [arguments]: Add --cxxflags to #:configure-flags.

* gnu/packages/ocaml.scm (lablgtk)[arguments]: Add #:parallel-build? #f.

* 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.

* Makefile.am (GUILD_COMPILE_FLAGS): New variable.
  (.scm.go): Use it.

* 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.

* gnu/packages/base.scm (glibc-2.21): New variable.

* gnu/package/video.scm (ffmpeg)[inputs]: Add gnutls.
  [arguments]: Enable it.

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

* 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.

* gnu/system/linux-container.scm (system-container): 'etc' is no longer
  a monadic value, and the result of 'file-union' must be lowered.

* gnu/packages/maths.scm (openblas)[arguments]: Make package
  substitutable when the system is MIPS.

* gnu/packages/maths.scm (openblas)[arguments]: Add "TARGET=SICORTEX" to
  make-flags when building for MIPS.

* gnu/packages/gl.scm (mesa-utils)[arguments]: Pass "--disable-egl"
  as #:configure-flags.

* gnu/packages/patches/xfce4-session-fix-xflock4.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/xfce.scm (xfce4-session)[source]: Add patch.

* gnu/packages/pcre.scm (pcre2): New variable.