gnu: Add lxappearance.

* gnu/packages/lxde.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

install: Reset the mtimes of all the files in the binary tarball.

* gnu/system/install.scm (self-contained-tarball): Pass "--mtime=@0".  The
  only files whose mtime was not already were those in /var/guix and
  /gnu/store/.links.

file-systems: 'uuid' raises a syntax error for invalid UUIDs.

* gnu/system/file-systems.scm (uuid): Call 'syntax-violation' when
  'string->uuid' returns #f.
* tests/file-systems.scm ("uuid, syntax error"): New test.

gnu: Update livestreamer to 1.12.2.

* gnu/packages/video (livestreamer): Update to 1.12.2.

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

size: Gracefully handle EPIPE.

* guix/scripts/size.scm (guix-size): Wrap body in 'leave-on-EPIPE'.

ui: Add 'leave-on-EPIPE'.

* guix/scripts/package.scm (leave-on-EPIPE): Move to...
* guix/ui.scm (leave-on-EPIPE): ... here.

Add 'guix-daemon.service' file for systemd.

* etc/guix-daemon.service.in: New file, provided by Ricardo Wurmus.
* daemon.am (CLEANFILES): Add etc/guix-daemon.service.
  (systemdservicedir, nodist_systemdservice_DATA): New variables.
  (EXTRA_DIST): Add etc/guix-daemon.service.in.
* doc/guix.texi (Binary Installation, Build Environment Setup): Mention
  'guix-daemon.service'.

system: Make /dev/kvm 660.

* gnu/services/base.scm (kvm-udev-rule): Change /dev/kvm mode to 0660 as a
  followup to the resolution of <http://bugs.gnu.org/18994>.

doc: Reinstate bit about creating build accounts.

* doc/guix.texi (Binary Installation): Reinstate bit about creating group and
  user accounts, which was inadvertently removed in 01dbc7e0.

gnu: icecat: Update to 31.8.0-gnu1.

* gnu/packages/patches/icecat-enable-acceleration-and-webgl.patch: New file.
* gnu/packages/patches/icecat-CVE-2015-2722-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-2722-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-2724-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-2724-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-2724-pt3.patch,
  gnu/packages/patches/icecat-CVE-2015-2724-pt4.patch,
  gnu/packages/patches/icecat-CVE-2015-2728-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-2728-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-2733-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-2733-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-2735.patch,
  gnu/packages/patches/icecat-CVE-2015-2736.patch,
  gnu/packages/patches/icecat-CVE-2015-2738.patch,
  gnu/packages/patches/icecat-CVE-2015-2739.patch,
  gnu/packages/patches/icecat-CVE-2015-2740.patch,
  gnu/packages/patches/icecat-CVE-2015-2743.patch: Remove files.
* gnu-system.am (dist_patch_DATA): Remove them, and add the new file.
* gnu/packages/gnuzilla.scm (icecat): Update to 31.8.0-gnu1.  Remove the
  outdated patches and add the new one.

gnu: libpcap: Enable plain "linux" backend.

* gnu/packages/admin.scm (libpcap)[arguments]: Add "--with-pcap=linux"
  configure flag.

gnu: setbfree: Disable unsupported optimizations on non-x86.

* gnu/packages/music.scm (setbfree)[arguments]: Override default OPTIMIZATIONS
  variable on non-x86 systems.

gnu: eigen: Use parallel-job-count.

* gnu/packages/algebra.scm (eigen)[arguments]: 'current-processor-count' ->
  'parallel-job-count'.

gnu: ccache: Update to 3.2.2.

* gnu/packages/ccache.scm (ccache): Update to 3.2.2.
  [arguments]: Rename 'patch-test-shebangs phase to 'setup-tests.  Set the
  SHELL environment variable.

emacs: Fill package heading in Info buffers.

* emacs/guix-info.el (guix-package-info-fill-heading): New variable.
  (guix-package-info-insert-heading): Fill heading if needed.

Co-authored-by: Alex Kost <alezost@gmail.com>

gnu: Add dunst.

* gnu/packages/dunst.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu: Add libxdg-basedir.

* gnu/packages/freedesktop.scm (libxdg-basedir): New variable.

file-systems: Allow users to specify file system UUIDs as strings.

Fixes <http://bugs.gnu.org/19778>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/system/file-systems.scm (%uuid-rx): New variable.
  (string->uuid): New procedure.
  (uuid): New macro.
* tests/file-systems.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* doc/guix.texi (File Systems): Give an example of UUID.

file-systems: Implement partition lookup by UUID.

* gnu/build/file-systems.scm (read-ext2-superblock*, partition-predicate): New
  procedures.
  (partition-label-predicate): Rewrite in terms of 'partition-predicate'.
  (partition-uuid-predicate, find-partition-by-uuid, uuid->string): New
  procedures.
  (%network-byte-order): New macro.
  (canonicalize-device-spec)[canonical-title]: Check whether SPEC is a string.
  [resolve]: New procedure.
  Add 'uuid' case and use it.

gnu: nss: Upgrade to 3.19.2.

* gnu/packages/gnuzilla.scm (nss): Upgrade to 3.19.2.