Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/image.scm

system: Add support for Linux-style mapped devices.

* gnu/system/file-systems.scm (<mapped-device>): New record type.
* gnu/system.scm (<operating-system>)[mapped-devices]: New field.
  (luks-device-mapping): New procedure.
  (other-file-system-services)[device-mappings, requirements]: New
  procedures.  Pass #:requirements to 'file-system-service'.
  (device-mapping-services): New procedure.
  (essential-services): Use it.  Append its result to the return value.
  (operating-system-initrd-file): Add comment.
* gnu/services/base.scm (file-system-service): Add #:requirements
  parameter and honor it.
  (device-mapping-service): New procedure.
* gnu/system/linux-initrd.scm (base-initrd): Add comment.

activation: Set the permissions of /etc/sudoers to 440.

* gnu/build/activation.scm (activate-etc): Move 'rm-f' to a local
  'define'.  When TARGET is "sudoers", make it 440.

system: Add '\w' to the default PS1.

* gnu/system.scm (etc-directory)[bashrc]: Add '\w' to PS1.

activation: Make the /bin/sh symlink at activation time.

* gnu/build/install.scm (directives): Remove "/bin/sh".
* gnu/build/activation.scm (activate-/bin/sh): New procedure.
* gnu/system.scm (operating-system-activation-script): Use it.

services: udev: Allow for additional udev rules.

* gnu/services/base.scm (udev-rules-union): New procedure.
  (udev-service): Add #:rules parameter.  Call 'udev-rules-union' and
  create udev.conf.  Set $UDEV_CONFIG_FILE before spawning udevd.

system: Add 'hosts-file' field.

* gnu/system.scm (<operating-system>)[hosts-file]: New field.
  (default-/etc/hosts): New procedure.
  (etc-directory): Add #:hosts-file parameter and honor it.
  (operating-system-etc-directory): Build /etc/hosts, and pass
  it as #:hosts-file to 'etc-directory'.

system: Add default PAM entries for xlock and xscreensaver.

* gnu/system/linux.scm (base-pam-services): Add "xlock" and
  "xscreensaver".

activation: Make sure /etc/sudoers & co. are regular files.

Before that, 'sudo' would exit with:

  sudo: /etc/sudoers is not a regular file
  sudo: no valid sudoers sources found, quitting

* gnu/build/activation.scm (activate-etc): Check if SOURCE matches
  'file-is-directory?'.  If not, use 'copy-file' instead of 'symlink'.

activation: Remove outdated comment.

* gnu/build/activation.scm (activate-etc): Remove outdated comment.

activation: Factorize the link-or-copy trick.

* gnu/build/activation.scm (link-or-copy): New procedure.
  (activate-setuid-programs): Use it.

gnu: Add weechat

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

Signed-off-by: Eric Bavier <bavier@member.fsf.org>

gnu: glpk: Update to 4.55.

* gnu/packages/maths.scm (glpk): Update to 4.55.

gnu: global: Update to 6.3.2.

* gnu/packages/global.scm (global): Update to 6.3.2.

gnu: freeipmi: Update to 1.4.5.

* gnu/packages/freeipmi.scm (freeipmi): Update to 1.4.5.

gnu: Have lua-5.1 compile a .so

* gnu/packages/patches/lua51-liblua-so.patch: New file
* gnu/packages/lua.scm: Use of lua51-liblua-so.patch in lua-5.1

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

nls: Adjust reference to stale file.

* po/packages/POTFILES.in: Replace recutils.scm with databases.scm.

gnu: lzip: Update to 1.16.

* gnu/packages/compression.scm (lzip): Update to 1.16.

profiles: Adjust for compatibility with Guile 2.0.5.

Reported by Andreas Enge <andreas@enge.fr>.

* guix/profiles.scm (right-arrow): Use 'set-port-conversion-strategy!'
  instead of '%default-port-conversion-strategy'.  The latter is only
  available in Guile 2.0.5.

gnu: lvm2: Programs such as 'dmsetup' now have a correct RUNPATH.

* gnu/packages/linux.scm (alsa-utils): Add comment.
  (lvm2): Add LDFLAGS as a configure flag.