gnu: python-mutagen: Update to 1.36.

* gnu/packages/music.scm (python-mutagen, python2-mutagen): Update to 1.36.

gnu: moc: Update to 2.5.2.

* gnu/packages/music.scm (moc): Update to 2.5.2.
[source](modules, snippet): Remove timestamps from the output.

gnu: cracklib: Fix buffer overflow.

* gnu/packages/patches/cracklib-fix-buffer-overflow.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/password-utils.scm (cracklib)[source]: Use it.

gnu: libtiff: Fix CVE-2016-{10092,10093,10094} and others.

* gnu/packages/patches/libtiff-CVE-2016-10092.patch,
gnu/packages/patches/libtiff-CVE-2016-10093.patch,
gnu/packages/patches/libtiff-CVE-2016-10094.patch,
gnu/packages/patches/libtiff-assertion-failure.patch,
gnu/packages/patches/libtiff-divide-by-zero-ojpeg.patch,
gnu/packages/patches/libtiff-divide-by-zero-tiffcp.patch,
gnu/packages/patches/libtiff-divide-by-zero-tiffcrop.patch,
gnu/packages/patches/libtiff-divide-by-zero.patch,
gnu/packages/patches/libtiff-heap-overflow-pixarlog-luv.patch,
gnu/packages/patches/libtiff-heap-overflow-tif-dirread.patch,
gnu/packages/patches/libtiff-heap-overflow-tiffcp.patch,
gnu/packages/patches/libtiff-heap-overflow-tiffcrop.patch,
gnu/packages/patches/libtiff-invalid-read.patch,
gnu/packages/patches/libtiff-null-dereference.patch,
gnu/packages/patches/libtiff-tiffcp-underflow.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/image.scm (libtiff)[replacement]: New field.
(libtiff/fixed): New variable.

gnu: notmuch: Update to 0.23.5.

* gnu/packages/mail.scm (notmuch, python2-notmuch): Update to 0.23.5.

gnu: xapian: Update to 1.4.2.

* gnu/packages/search.scm (xapian): Update to 1.4.2.

gnu: gnutls: Replace with 3.5.8 [fixes GNUTLS-SA-2017-{1,2}].

* gnu/packages/tls.scm (gnutls-3.5.8): New variable.
(gnutls)[replacement]: New field.

gnu: rofi: Update to 1.3.1.

* gnu/packages/xdisorg.scm (rofi): Update to 1.3.1.

gnu: youtube-dl: Update to 2017.01.10.

* gnu/packages/video.scm (youtube-dl): Update to 2017.01.10.  Change
URLs to yt-dl.org.

gnu: e2fsprogs: Remove timestamp from 'libext2fs.info.gz'.

* gnu/packages/linux.scm (e2fsprogs)[source](snippet): Patch
'doc/Makefile.in' to use the '-n' option of gzip.

gnu: e2fsprogs: Use symlinks instead of hard links.

* gnu/packages/linux.scm (e2fsprogs)[arguments]: Pass
"--enable-symlink-install".

gnu: Add sysstat.

* gnu/packages/linux.scm (sysstat): New variable.

gnu: python-click: Update to 6.7.

* gnu/packages/python.scm (python-click): Update to 6.7.

gnu: linux-libre@4.4: Update hash for fixed upstream tarball.

The initial upload of linux-libre-4.4.41-gnu.tar.xz was corrupted.

* gnu/packages/linux.scm (linux-libre-4.4)[source]: Update hash.

guix archive: Allow compilation in the absence of Guile-JSON.

Fixes <http://bugs.gnu.org/25409>.
Reported by Ben Woodcroft <b.woodcroft@uq.edu.au>.

* guix/scripts/archive.scm: Use 'module-autoload!' instead of #:use-module
to (guix docker).

gnu: libgit2, python-pygit2: Update to 0.25.1 [security fixes].

See <http://www.openwall.com/lists/oss-security/2017/01/10/5>.

* gnu/packages/version-control.scm (libgit2): Update to 0.25.1.
* gnu/packages/python.scm (python-pygit2): Update to 0.25.0.

http-client: Improve error reporting.

* guix/http-client.scm (http-fetch): Change message in &message
condition to include URI, CODE, and the reason phrase.

system: Add btrfs file system support.

* gnu/build/file-systems.scm (%btrfs-endianness, btrfs-superblock?,
  read-btrfs-superblock, btrfs-superblock-uuid,
  btrfs-superblock-volume-name, check-btrfs-file-system): New variables.
  (%paritition-label-readers, %partition-uuid-readers): Add btrfs
  readers.
* gnu/system/linux-initrd.scm (linux-modules): Add btrfs modules when a
  btrfs file-system is used.
* gnu/tests/install.scm (%btrfs-root-os %btrfs-root-os-source,
  %btrfs-root-installation-script, %test-btrfs-root-os): New system
  test.
* doc/guix.texi: Adjust accordingly.

Fixes <http://bugs.gnu.org/19280>.

gnu: Add btrfs-progs/static.

* gnu/packages/linux.scm (btrfs-progs/static): New variable.

file-systems: Refactor file-system predicates.

* gnu/build/file-systems.scm (partition-field-reader,
  read-partition-field, %partition-label-readers,
  %partition-uuid-readers, read-partition-label, read-partition-uuid):
  New variables.
  (partition-predicate, partition-label-predicate,
  partition-uuid-predicate, luks-partition-uuid-predicate): Use
  partition field readers.
  (find-partition): New variable.
  (find-partition-by-label, find-partition-by-uuid,
  find-partition-by-luks-uuid): Use find-partition-by.