This is a followup to bcb13287.

* doc/guix.texi (G-Expressions): Move paragraph about extensibility
  below.  Remove assumptions that things are either packages or
  derivations.

* gnu/services/lirc.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Various Services): New node.  Document 'lirc-service'.

* doc/guix.texi (Running the Test Suite): New section.

From now own, (guix packages) depends on (guix gexps); it was the other
way around now.  This means that (guix packages) code can use gexps.

* guix/gexp.scm (origin-compiler, package-compiler): Remove.
  (default-guile-derivation): New procedure.
  (gexp->derivation): Use it instead of 'default-guile' +
  'package->derivation'.
* guix/packages.scm (default-guile-derivation): New procedure.
  (package-compiler, origin-compiler): New variables.
* doc/guix.texi (G-Expressions): Mention extensibility.

* gnu/services/xorg.scm (<session-type>, %windowmaker-session-type)
  (%ratposion-session-type, %sawfish-session-type, %default-xsessions)
  (xsessions-directory): Remove.
  (slim-service): Remove #:sessions parameter.
  [slim.cfg]: Use /run/current-system/profile/share/xsessions as sessiondir.
* doc/guix.texi <X Window>: Adjust accordingly.

Suggested by Tomáš Čech.

* doc/guix.texi (Using the Configuration System): Pass #:initialize? #t
  to 'lsh-service'.

This reverts commit e979e6dd.

* gnu/system.scm (<operating-system>)[x509-certificates]: New field.
  (etc-directory): Add #:x509-certificates parameter and honor it.
  (operating-system-etc-directory): Pass #:x509-certificates in
  'etc-directory' call.
* doc/guix.texi (operating-system Reference): Document
  'x509-certificates'.

That makes WindowMaker the default session, by default.

* gnu/services/xorg.scm (xsessions-directory)[builder]: Prepend a number
  in the file name to preserve the order of SESSIONS.
  (slim-service): Augment docstring.
* doc/guix.texi (X Window): Adjust accordingly.

* guix/import/cpan.scm (%corelist): New variable.
  (module->dist-name, core-module?): New procedures.
  (cpan-module->sexp)[convert-inputs]: Use them.  Include "test" dependencies
  in converted inputs.
* doc/guix.texi (Invoking guix import)[cpan]: Mention corelist filtering.

* guix/build/perl-build-system.scm (configure): Use Build.PL if present.
  (build, check, install): New procedures.
  (%standard-phases): Replace build, check, and install phases.
* guix/build-system/perl (perl-build): Add make-maker? and module-build-flags
  arguments.
* doc/guix.texi (Build Systems)[perl-build-system]: Document behavior rsp.
  Build.PL and new arguments.

* guix/gexp.scm (gexp->derivation): Add #:graft? parameter and honor it.
* tests/gexp.scm ("gexp->derivation vs. grafts"): New test.
* doc/guix.texi (G-Expressions): Update 'gexp->derivation'
  documentation.

* guix/store.scm (text-file): Add optional 'references' parameter.  Pass
  it to 'add-text-to-store'.
* doc/guix.texi (The Store Monad): Adjust accordingly.

* guix/gexp.scm (lower-references): New procedure.
  (gexp->derivation): Add #:allowed-references and honor it.
* tests/gexp.scm ("gexp->derivation #:allowed-references",
  "gexp->derivation #:allowed-references, disallowed"): New tests.
* doc/guix.texi (G-Expressions): Update 'gexp->derivation' doc.

Reported by Quentin Pradet <webmasters-comment@gnu.org>.

* doc/guix.texi (System Installation): Use @code instead of @url for the
  abstract URL.

* gnu/services/ssh.scm (lsh-service): New #:keys (daemonic?, pid-file?,
  pid-file).  Build new lshd-command and expand service-requirement
  field.
* doc/guix.texi (Networking Services): Update accordingly.

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

* guix/build-system/waf.scm,
  guix/build/waf-build-system.scm: New files.
* Makefile.am (MODULES): Add them.
* doc/guix.texi (Build Systems): Document waf-build-system.

Reported by Marek Benc.

* doc/guix.texi (Initial RAM Disk): Remove ".ko" from the 'base-initrd'
  example.  Add a comment.

Fixes <http://bugs.gnu.org/19771>.
Reported by Andrei Osipov <andrspv@gmail.com>.

* doc/guix.texi (Invoking guix-daemon): Document the build directory
  location.

Reported on #guix.

* doc/guix.texi (System Installation)[USB Stick Installation]: Mention
  "eno1" instead of "eth0" and give other examples.

* gnu/services/networking.scm (wicd-service): New procedure.
* doc/guix.texi (Networking Services): Document it.

* gnu/services/base.scm (nscd-service): Add #:name-services parameter.
  In 'start' field, set LD_LIBRARY_PATH based on #:name-services.
* doc/guix.texi (Base Services): Document it.
  (Name Service Switch): Link to 'nscd-service'.

* gnu/system/nss.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu.scm (%public-modules): Add it.
* gnu/system.scm (<operating-system>)[name-service-switch]: New field.
  (etc-directory): Add #:nss parameter and honor it.
  (operating-system-etc-directory): Adjust call accordingly.
* doc/guix.texi (operating-system Reference): Document
  'name-service-switch'.
  (Name Service Switch): New section.

* gnu/services/xorg.scm (%sawfish-session-type): New variable.
* doc/guix.texi (X Window): Mention it.

* guix/store.scm (build-derivations): Remove.
* guix/derivations.scm (build-derivations): Write in terms of
  'build-things'.
* doc/guix.texi (Invoking guix build): Adjust text accordingly.

* doc/guix.texi (Networking Services): Fix typo in 'lsh-service'
  parameters.

* doc/guix.texi (System Installation): Change to --image-size=850MiB.

* doc/guix.texi (System Installation): Change the file name to
  'gsd-usb-install-*'.

* doc/guix.texi (System Installation): Mention Xfce.  Update package
  count.

* doc/guix.texi (Invoking guix lint): Give examples of checkers.

* gnu/services/xorg.scm (<session-type>): New record type.
  (%windowmaker-session-type, %ratpoison-session-type): New variables.
  (%default-xsessions): Use them.
  (xsessions-directory): Expect SESSIONS to be a list of <session-type>
  and rewrite accordingly.
  (slim-service): Adjust docstring.
* doc/guix.texi (X Window): Update accordingly.

* gnu/services/base.scm (guix-service): Change AUTHORIZE-HYDRA-KEY?
  default value to #t.

* doc/emacs.texi (Emacs Initial Setup): Mention that it works
  out-of-the-box on GSD.

* doc/guix.texi (System Installation): Change image name to guix-usb-*.

* doc/guix.texi (Introduction): Introduce "Guix System Distribution".
  Add a couple of sentences about it.  Remove "Guixotic".
  (GNU Distribution): Likewise.
  (System Installation): Ditto.

* doc/guix.texi (The Store Monad): Document '%state-monad' and related
  procedures.  Describe '%store-monad' as an alias for '%state-monad'.
* guix/monads.scm: Update commentary.

* guix/scripts/archive.scm (show-help, %options): Add -r/--recursive.
  (export-from-store): Pass #:recursive? to 'export-paths'.
* doc/guix.texi (Invoking guix archive): Add -r in Emacs example.  Add
  example with ~/.guix-profile.  Document -r/--recursive.

* doc/guix.texi (Invoking guix archive): Mention ECDSA/Ed25519 as the
  default type of keys for libgcrypt >= 1.6.0.

This turns (guix monads) into a generic module for monads, and moves the
store monad and related monadic procedures in their corresponding
module.

* guix/monads.scm (store-return, store-bind, %store-monad, store-lift,
  text-file, interned-file, package-file, package->derivation,
  package->cross-derivation, origin->derivation, imported-modules,
  compiled, modules, built-derivations, run-with-store): Move to...
* guix/store.scm (store-return, store-bind, %store-monad, store-lift,
  text-file, interned-file): ... here.
  (%guile-for-build): New variable.
  (run-with-store): Moved from monads.scm.  Remove default value for
  #:guile-for-build.
* guix/packages.scm (default-guile): Export.
  (set-guile-for-build): New procedure.
  (package-file, package->derivation, package->cross-derivation,
  origin->derivation): Moved from monads.scm.
* guix/derivations.scm (%guile-for-build): Remove.
  (imported-modules): Rename to...
  (%imported-modules): ... this.
  (compiled-modules): Rename to...
  (%compiled-modules): ... this.
  (built-derivations, imported-modules, compiled-modules): New
  procedures.
* gnu/services/avahi.scm, gnu/services/base.scm, gnu/services/dbus.scm,
  gnu/services/dmd.scm, gnu/services/networking.scm,
  gnu/services/ssh.scm, gnu/services/xorg.scm, gnu/system/install.scm,
  gnu/system/linux-initrd.scm, gnu/system/shadow.scm, guix/download.scm,
  guix/gexp.scm, guix/git-download.scm, guix/profiles.scm,
  guix/svn-download.scm, tests/monads.scm: Adjust imports accordingly.
* guix/monad-repl.scm (default-guile-derivation): New procedure.
  (store-monad-language, run-in-store): Use it.
* build-aux/hydra/gnu-system.scm (qemu-jobs): Add explicit
  'set-guile-for-build' call.
* guix/scripts/archive.scm (derivation-from-expression): Likewise.
* guix/scripts/build.scm (options/resolve-packages): Likewise.
* guix/scripts/environment.scm (guix-environment): Likewise.
* guix/scripts/system.scm (guix-system): Likewise.
* doc/guix.texi (The Store Monad): Adjust module names accordingly.

This is a follow-up to commit 462a3fa3.

* doc/guix.texi (The Store Monad): Move 'text-file*'...
  (G-Expressions): ... to here.