doc: Mention 'specification->package'.

Suggested by Florian Paul Schmidt <mista.tapas@gmx.net>.

* doc/guix.texi (Using the Configuration System): Mention
'specification->package'.

services: tor: Store private data under /var/lib/tor.

* gnu/services/networking.scm (tor-configuration->torrc): Add
'DataDirectory' clause.  Change 'HiddenServiceDir' to
/var/lib/tor/hidden-services/NAME.
(tor-hidden-service-activation): Create /var/lib/tor.
(tor-hidden-service): Adjust docstring.
* doc/guix.texi (Networking Services): Adjust accordingly.

services: Add 'tor-hidden-service'.

* gnu/services/networking.scm (<tor-configuration>, <hidden-service>):
New record types.
(tor-configuration->torrc): New procedure.
(tor-dmd-service): Use it.
(tor-hidden-service-activation): New procedure.
(tor-service-type)[extensions]: Extend ACTIVATION-SERVICE-TYPE.
[compose, extend]: New fields.
(tor-service): Use 'tor-configuration'.
(tor-hidden-service-type): New variable.
(tor-hidden-service): New procedure.

Add 'guix-daemon.conf' job for Upstart.

* etc/guix-daemon.conf.in: New file.
* daemon.am (CLEANFILES): Add etc/guix-daemon.conf.
  (upstartjobdir, nodist_upstartjob_DATA): New variables.
  (EXTRA_DIST): Add etc/guix-daemon.conf.in.
* doc/guix.texi (Binary Installation, Build Environment Setup): Mention
  'guix-daemon.conf'.

Signed-off-by: Mario Daniel Ruiz Saavedra <desiderantes@rocketmail.com>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

lint: Add "cve" checker.

Fixes <http://bugs.gnu.org/21289>.

* guix/scripts/lint.scm (package-name->cpe-name, package-vulnerabilities)
(check-vulnerabilities): New procedures.
* guix/scripts/lint.scm (%checkers): Add "cve" checker.
* tests/lint.scm ("cve", "cve: one vulnerability"): New tests.
* doc/guix.texi (Invoking guix lint): Mention it.

doc: Remove mention of monadic services.

* doc/guix.texi (Base Services): Remove mention of a list of monadic
services.

services: dmd: Add 'modules' and 'imported-modules' fields.

* gnu/services/dmd.scm (%default-imported-modules, %default-modules):
New variables.
* gnu/services/dmd.scm (<dmd-service>)[modules, imported-modules]: New
field.
* gnu/services/dmd.scm (dmd-service-file-name, dmd-service-file): New
procedures.
(dmd-configuration-file)[modules]: Compute based on the
'imported-modules' field of SERVICES.
(dmd-configuration-file): Remove 'use-modules' form.  Use
'dmd-service-file', and call 'primitive-load' on each file.
* doc/guix.texi (dmd Services): Document the new fields.

graph: Add '%bag-with-origins-node-type'.

* guix/scripts/graph.scm (bag-node-edges): Remove 'filter' call.  Add
case for 'origin'.
(%bag-node-type)[edges]: Add filtering here.
(%bag-with-origins-node-type): New variable.
(%node-types): Add it.
* tests/graph.scm ("bag DAG, including origins"): New test.
* tests/guix-graph.sh: Add 'bag-with-origins'.
* doc/guix.texi (Invoking guix graph): Document it.

doc: Mention the 'NIX_REMOTE' variable for 'guix import nix'.

Suggested by rgrau on #guix.

* doc/guix.texi (Invoking guix import): Document 'NIX_REMOTE'.

refresh: Add '--expression'.

* guix/scripts/refresh.scm (%options, show-help): Add --expression.
(guix-refresh): Honor it.
* doc/guix.texi (Invoking guix refresh): Document it.

doc: Mention 'guix environment guix'.

* doc/contributing.texi (Building from Git): Mention 'guix environment
guix'.  Remove outdated description of ./bootstrap.  Clarify a few
things.

doc: Remove extraneous "See."

* doc/contributing.texi (Building from Git): Remove extra "See" and use
@xref instead of @pxref.

doc: Fix 'geiser-guile-load-path' example.

Reported by marusich on #guix.

* doc/contributing.texi (The Perfect Setup): Wrap modifying
  'geiser-guile-load-path' into 'with-eval-after-load'.

doc: Mention fonts for Asian languages.

Suggested by Alex Vong <alexvong1995@gmail.com>.

* doc/guix.texi (Application Setup): Explain how to install X11 fonts
  for Asian languages.

doc: Update documentation of the 'services' field.

* doc/guix.texi (operating-system Reference): The 'services' field now
  contains a list of service objects.

edit: Honor $VISUAL.

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

* guix/scripts/edit.scm (%editor): Honor 'VISUAL' before 'EDITOR'.
  (show-help): Adjust accordingly.
* doc/guix.texi (Invoking guix edit): Likewise.

guix package: '--search-paths' can report combined search paths.

Partly fixes <http://bugs.gnu.org/20255>.

* guix/scripts/package.scm (search-path-environment-variables): Change
  'profile' to 'profiles'; expect it to be a list.
  (display-search-paths): Likewise.
  (%default-options): Remove 'profile' entry.
  (%options) <--profile>: Keep previous values associated with 'profile'
  in RESULT.
  (guix-package)[process-actions, process-query]: Handle the possible
  lack of 'profile' pair in OPTS.

install: Run GPM.

Suggested by Adam Pribyl <pribyl@lowlevel.cz>
at <https://lists.gnu.org/archive/html/guix-devel/2015-11/msg00133.html>.

* gnu/system/install.scm (installation-services): Add call to
  'gpm-service'.
* doc/guix.texi (System Installation): Mention GPM.

services: Add 'gpm-service'.

* gnu/services/base.scm (<gpm-configuration>): New record type.
  (gpm-dmd-service): New procedure.
  (gpm-service-type): New variable.
  (gpm-service): New procedure.
* doc/guix.texi (Base Services): Document it.

doc: Make the ifconfig command more visible.

Suggested by Adam Pribyl <pribyl@lowlevel.cz>.

* doc/guix.texi (System Installation): Move the 'ifconfig' command to an
  @example.